Enbridge will contribute its wholly-owned Rio Bravo Pipeline project and cash in exchange for an ownership stake in the newly formed joint venture. Following the closing of the transaction, the ownership in the joint venture will be WhiteWater/I Squared (50.6%), MPLX (30.4%), and Enbridge (19.0%). Enbridge will retain a 25% economic interest in the Rio Bravo Pipeline project as part of its investment (subject to certain redemption rights of the joint venture partners). WhiteWater will continue to operate the joint venture's assets, including the Rio Bravo Pipeline project.

The combined platform will provide significant benefits to the joint venture's customers by connecting Permian supply to incremental LNG export markets via Rio Bravo's connectivity with NextDecade's Rio Grande LNG facility. Additionally, the creation of this platform is anticipated to support the development of incremental pipeline projects connecting Permian supply to export markets along the Gulf Coast.

The transaction is expected to close in the second quarter of 2024 after receipt of required regulatory approvals and satisfaction of other customary closing conditions.

"This strategic transaction is a win for WhiteWater/I Squared and MPLX. It extends the average contract tenor, brings us closer to an important strategic partner in Enbridge and positions us well for future development opportunities supporting Gulf Coast LNG. WhiteWater is excited to add Enbridge as a partner and NextDecade's Rio Grande LNG as a customer. Together we will continue to grow our Texas pipeline network," said Christer Rundlof, Chief Executive Officer of WhiteWater.

"This transaction is a continuation of MPLX's wellhead-to-water growth strategy, enhancing our natural gas value chain in the Permian basin and South Texas. The strategic combination of these assets position the Whistler Pipeline system for future capacity expansions to meet increasing demand for natural gas supply to Gulf Coast LNG facilities," said Dave Heppner, Senior Vice President of MPLX.

"We are excited to join WhiteWater/I Squared and MPLX in a joint venture to connect sustainable Permian natural gas production to export markets as part of our USGC strategy. Acquiring a meaningful equity interest in an integrated natural gas pipeline and storage network that is directly connected to our existing infrastructure provides customers, like NextDecade, with valuable last mile connectivity and unlocks future growth opportunities," said Cynthia Hansen, EVP and President, Gas Transmission and Midstream of Enbridge.

"The combination of Whistler Pipeline and Rio Bravo Pipeline assets confirms the importance of our Rio Grande LNG project as a major market for associated gas from the Permian Basin," said Matt Schatzman, NextDecade Chairman and Chief Executive Officer. "We are excited to have WhiteWater, I Squared, MPLX and Enbridge as partners in the delivery of the Rio Bravo Pipeline for the Rio Grande LNG project and we look forward to growing our relationship with their new joint venture."

About the Whistler Pipeline

The Whistler Pipeline has approximately 2.5 billion cubic feet per day of capacity and the system is comprised of approximately 450 miles of 42-inch diameter pipeline that transports natural gas from the Permian Basin to Agua Dulce, Texas, with direct connections to Corpus Christi and the gulf coast. The pipeline also has an approximately 85-mile, 36-inch diameter lateral to the Midland Basin.

About WhiteWater

WhiteWater is an Austin, Texas based infrastructure company, and operator of the Whistler Pipeline. WhiteWater is partnered with multiple private equity funds including but not limited to I Squared Capital. For more information about WhiteWater, visit www.wwdev.com.

About I Squared Capital

I Squared Capital is a leading independent global infrastructure investment manager with over $38 billion in assets under management focused on investing in North America, Europe, Asia, and Latin America. Headquartered in Miami, the firm has more than 260 professionals across its offices in London, Munich, New Delhi, São Paulo, Singapore, Sydney and Taipei. I Squared Capital has invested in a diverse portfolio of 82 companies with over 66,000 employees in 71 countries across the utilities, energy, digital infrastructure, transport, environmental infrastructure, and social infrastructure sectors providing essential services to millions of people around the world. You can find out more by visiting: www.isquaredcapital.com.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. MPLX also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About Enbridge Inc.

At Enbridge, we safely connect millions of people to the energy they rely on every day, fueling quality of life through our North American natural gas, oil, and renewable power networks and our growing European offshore wind portfolio. We are investing in modern energy delivery infrastructure to sustain access to secure, affordable energy and building on more than a century of operating conventional energy infrastructure and two decades of experience in renewable power. We are advancing new technologies, including hydrogen, renewable natural gas, carbon capture, and storage, and are committed to achieving net zero greenhouse gas emissions by 2050. Headquartered in Calgary, Alberta, Enbridge's common shares trade under the symbol ENB on the Toronto (TSX) and New York (NYSE) stock exchanges. To learn more, visit us at enbridge.com.

MPLX Forward-Looking Statement

This press release contains forward-looking statements regarding MPLX. These forward-looking statements may relate to, among other things, MPLX's expectations, estimates and projections concerning its business and operations, including with respect to MPLX's investment in the joint venture and the strategic combination announced herein (the "Transaction"), including anticipated benefits and expected closing date of the Transaction. You can identify forward-looking statements by words such as "anticipate," "believe," "commitment," "continue," "could," "design," "estimate," "expect," "forecast," "future," "goal," "guidance," "intend," "may," "objective," "opportunity," "outlook," "plan," "policy," "position," "potential," "predict," "priority," "project," "prospective," "pursue," "seek," "should," "strategy," "target," "will," "would" or other similar expressions that convey the uncertainty of future events or outcomes. MPLX cautions that these statements are based on management's current knowledge and expectations and are subject to certain risks and uncertainties, many of which are outside of the control of MPLX, that could cause actual results and events to differ materially from the statements made herein. Factors that could cause MPLX's actual results to differ materially from those implied in the forward-looking statements include but are not limited to: the timing and impact of the Transaction; the timing and extent of changes in commodity prices and demand for natural gas, crude oil, refined products, feedstocks or other hydrocarbon-based products or renewables; changes in the timing and construction costs and in service dates of planned and ongoing projects and investments, including with respect to the Transaction; the ability to obtain regulatory and other approvals with respect to the Transaction or related planned projects; industrial incidents or other unscheduled shutdowns; other risk factors inherent to MPLX's industry; the impact of adverse market conditions or other similar risks to those identified herein affecting MPLX; and the factors set forth under the heading "Risk Factors" in MPLX's and Annual Report on Form 10-K for the year ended Dec. 31, 2023, and in other filings with the SEC.

All forward-looking statements, whether written or oral, attributable to MPLX or persons acting on MPLX's behalf, are expressly qualified in their entirety by these cautionary statements. Any forward-looking statement speaks only as of the date of the applicable communication and we undertake no obligation to update any forward-looking statement except to the extent required by applicable law.

Enbridge Forward-Looking Statement

Forward-looking information, or forward-looking statements, have been included in this news release to provide information about Enbridge and its subsidiaries and affiliates, including management's assessment of Enbridge and its subsidiaries' future plans and operations. This information may not be appropriate for other purposes. Forward-looking statements are typically identified by words such as ''anticipate'', ''expect'', ''project'', ''estimate'', ''forecast'', ''plan'', ''intend'', ''target'', ''believe'', "likely" and similar words suggesting future outcomes or statements regarding an outlook. Forward-looking information or statements included or incorporated by reference in this document include, but are not limited to, statements with respect to Enbridge's investment in the joint venture and related matters (the "Transaction"), including anticipated benefits and expected closing date of the Transaction.

Although Enbridge believes these forward-looking statements are reasonable based on the information available on the date such statements are made and processes used to prepare the information, such statements are not guarantees of future performance and readers are cautioned against placing undue reliance on forward-looking statements. By their nature, these statements involve a variety of assumptions, known and unknown risks and uncertainties and other factors, which may cause actual results, levels of activity and achievements to differ materially from those expressed or implied by such statements. Material assumptions include assumptions about customer, regulatory and stakeholder support and approvals, including with respect to the Transaction; expectations about our joint venture partners' ability to complete the Transaction; the timing and impact of the Transaction; and the ability of management to execute key priorities. Assumptions regarding the expected supply of and demand for crude oil, natural gas, natural gas liquids, liquefied natural gas and renewable energy, and the prices of these commodities, are material to and underlie all forward-looking statements, as they may impact current and future levels of demand for Enbridge's services. Similarly, exchange rates, inflation and interest rates impact the economies and business environments in which Enbridge operates and may impact levels of demand for Enbridge's services and cost of inputs and are, therefore, inherent in all forward-looking statements. Due to the interdependencies and correlation of these macroeconomic factors, the impact of any one assumption on a forward-looking statement cannot be determined with certainty.

Enbridge's forward-looking statements are subject to risks and uncertainties, including, but not limited to with respect to the realization of anticipated benefits of the Transaction and other risks and uncertainties discussed in this news release and in Enbridge's other filings with Canadian and U.S. securities regulators. The impact of any one risk, uncertainty or factor on a particular forward-looking statement is not determinable with certainty as these are interdependent and Enbridge's future course of action depends on management's assessment of all information available at the relevant time. Except to the extent required by applicable law, Enbridge assumes no obligation to publicly update or revise any forward-looking statements made in this news release or otherwise, whether as a result of new information, future events or otherwise. All forward-looking statements, whether written or oral, attributable to Enbridge or persons acting on Enbridge's behalf, are expressly qualified in their entirety by these cautionary statements.

The Whistler Pipeline is a leading core energy infrastructure system connecting the Permian Basin’s growing natural gas supply to LNG, Mexico, and Gulf Coast demand. Whistler will have direct connections into LNG facilities in the Corpus Christi area. Nearly all current capacity is contracted under long-term, fixed-fee minimum volume commitments, primarily with investment grade counterparties.

I Squared Capital sees increasing long-term demand for natural gas across the U.S. Gulf Coast due to the growth in LNG liquefaction capacity being constructed in the region, as well as growing demand from Mexico. The Whistler pipeline offers the rare combination of strong free cash flow, high-quality contracts, and operating rights on highly strategic natural gas infrastructure.

The management team, who retain a significant portion of equity in the business, has an established reputation for growing contracted cash flows through developing and operating greenfield projects and has identified several initiatives to accelerate further growth of the platform. Christer Rundlof, CEO of WhiteWater, said, “I’d like to thank our JV partners, shippers and current investors for their support. Whistler has been a tremendous success providing a much-needed connection between the Permian Basin and gas demand. We are very excited about the partnership with I Squared and look forward to continuing to serve our customers with Whistler and future, related projects.”

Given the long-term demand for LNG infrastructure in this strategic area, I Squared Capital is evaluating additional investments to promote the energy transition and support the security of the global energy supply at a critical time.

About the Whistler Pipeline

Completed in June 2021, the Whistler Pipeline has approximately 2.0 billion cubic feet per day of current capacity that will be expanded to 2.5 billion cubic feet per day by late 2023. The system is comprised of approximately 450 miles of 42-inch diameter pipeline that transports natural gas from the Waha area in the Permian Basin to Agua Dulce, Texas with connections on to Corpus Christi and the coast. The pipeline also has an approximately 85-mile, 36-inch diameter lateral to the Midland Basin.

I Squared Capital was advised by Kirkland & Ellis LLP as legal counsel and by TPH&Co., the energy business of Perella Weinberg Partners, as lead financial advisor, with Goldman Sachs as financial advisor. First Infrastructure Capital, Ridgemont Equity Partners and WhiteWater were advised by Simpson Thacher & Bartlett, LLP as legal counsel and Barclays as financial advisor. First Infrastructure Capital and Ridgemont Equity Partners were also advised by Milbank LLP and Troutman Pepper, respectively, as legal counsel. Stonepeak was advised by Sidley Austin LLP as legal counsel and RBC Capital Markets as financial advisor.

About I Squared Capital

I Squared Capital is an independent global infrastructure investment manager with over $36 billion in assets under management focusing on energy, utilities, digital infrastructure, environmental infrastructure, transport and social infrastructure in North America, Europe, Latin America, and Asia. The firm has offices in Miami, Hong Kong, London, New Delhi, Singapore, Taipei, and Sydney.

Contacts

Andreas Moon
Partner and Head of Investor Relations
I Squared Capital
andreas.moon@isquaredcapital.com

The Matterhorn Express Pipeline has been designed to transport up to 2.5 billion cubic feet per day (Bcf/d) of natural gas through approximately 490 miles of 42-inch pipeline from Waha, Texas, to the Katy area near Houston, Texas. Supply for the Matterhorn Express Pipeline will be sourced from multiple upstream connections in the Permian Basin, including direct connections to processing facilities in the Midland Basin through an approximately 75-mile lateral, as well as a direct connection to the 3.2 Bcf/d Agua Blanca Pipeline, a joint venture between WhiteWater and MPLX.

“WhiteWater is excited to partner with EnLink, Devon, and MPLX to develop incremental gas transportation out of the Permian Basin as production continues to grow in West Texas,” said Christer Rundlof, CEO of WhiteWater. “Matterhorn will provide premium market access with superior flexibility for Permian Basin shippers while playing a critical role in minimizing flared volumes.”

The Matterhorn Express Pipeline is expected to be in service in the third quarter of 2024, pending the receipt of customary regulatory and other approvals.

About WhiteWater

WhiteWater, an Austin, Texas based infrastructure company, has partnered with Ridgemont Equity Partners and First Infrastructure Capital on the Matterhorn Express Pipeline. For more information about WhiteWater, visit www.wwdev.com.

About EnLink Midstream

EnLink Midstream reliably operates a differentiated midstream platform that is built for long-term, sustainable value creation. EnLink's best-in-class services span the midstream value chain, providing natural gas, crude oil, condensate, and NGL capabilities, and carbon capture, transportation, and sequestration services. EnLink’s purposely built, integrated asset platforms are in premier production basins and core demand centers, including the Permian Basin, Oklahoma, North Texas, and the Gulf Coast. EnLink's strong financial foundation and commitment to execution excellence drive competitive returns and value for its employees, customers, and investors. Headquartered in Dallas, EnLink is publicly traded through EnLink Midstream, LLC (NYSE: ENLC). Visit www.EnLink.com to learn how EnLink connects energy to life.

About Devon Energy

Devon Energy is a leading oil and gas producer in the U.S. with a premier multi-basin portfolio headlined by a world-class acreage position in the Delaware Basin. Devon’s disciplined cash-return business model is designed to achieve strong returns, generate free cash flow and return capital to shareholders, while focusing on safe and sustainable operations. For more information, please visit www.devonenergy.com.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. MPLX also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com.

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

About Ridgemont Equity Partners

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested over $6.0 billion. The firm focuses on equity investments up to $250 million and utilizes a proven, industry-focused investment approach and repeatable value creation strategies. For more information about Ridgemont, visit www.ridgemontep.com.

Contacts

WhiteWater Investor Relations: www.wwdev.com

EnLink Midstream Partners Investor Relations: Brian Brungardt (214) 721-9353

Devon Energy Investor Relations: Scott Coody (405) 552-4735

MPLX LP Investor Relations: Kristina Kazarian (419) 421-2071

Some of the above statements constitute forward-looking statements. Forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond the control of the companies named herein and are difficult to predict. Factors that could impact the opportunities described above include but are not limited to general domestic and international economic and political conditions and the factors described in the filings with the Securities and Exchange Commission of the companies named herein. Any forward-looking statement speaks only as of the date of the applicable communication and the companies named herein undertake no obligation to update any forward-looking statement except to the extent required by applicable law.

About the Whistler Pipeline

The Whistler pipeline is an approximately 450-mile, 42-inch intrastate pipeline that transports natural gas from the Waha Header in the Permian Basin to Agua Dulce, Texas, providing direct access to South Texas and export markets. An approximately 85-mile 36-inch lateral provides connectivity to the Midland Basin.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. MPLX also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About WhiteWater

WhiteWater is an Austin, Texas based infrastructure company. WhiteWater is partnered with multiple private equity funds including but not limited to Ridgemont Equity Partners and First Infrastructure Capital. For more information about WhiteWater, visit www.wwdev.com.

About Ridgemont Equity Partners

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested over $6.0 billion. The firm focuses on equity investments up to $250 million and utilizes a proven, industry-focused investment approach and repeatable value creation strategies. For more information about Ridgemont, visit www.ridgemontep.com.

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

About Stonepeak

Stonepeak is a leading alternative investment firm specializing in infrastructure and real assets with approximately $46 billion of assets under management. Through its investment in defensive, hard-asset businesses globally, Stonepeak aims to create value for its investors and portfolio companies, and to have a positive impact on the communities in which it operates. Stonepeak sponsors investment vehicles focused on private equity and credit. The firm provides capital, operational support, and committed partnership to sustainably grow investments in its target sectors, which include communications, energy transition, transport and logistics, and social infrastructure. Stonepeak is headquartered in New York with offices in Austin, Hong Kong, Houston, London and Sydney. For more information, please visit www.stonepeak.com.

Contacts

MPLX LP Investor Relations: Kristina Kazarian (419) 421-2071

WhiteWater Investor Relations: www.wwdev.com

Stonepeak: Kate Beers (646) 540-5225

Some of the above statements constitute forward-looking statements. Forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond the control of the companies named herein and are difficult to predict. Factors that could impact the opportunities described above include but are not limited to general domestic and international economic and political conditions and the factors described in MPLX’s filings with the Securities and Exchange Commission (SEC). Any forward-looking statement speaks only as of the date of the applicable communication and the companies named herein undertake no obligation to update any forward-looking statement except to the extent required by applicable law. Copies of MPLX's Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and other SEC filings are available on the SEC's website, MPLX's website at http://ir.mplx.com or by contacting MPLX's Investor Relations office.

Whistler is owned by a consortium including MPLX LP (NYSE: MPLX), WhiteWater, and a joint venture between Stonepeak and West Texas Gas, Inc. (WTG).

About the Whistler Pipeline

The Whistler pipeline is an approximately 450-mile, 42-inch intrastate pipeline that transports natural gas from the Waha Header in the Permian Basin to Agua Dulce, Texas, providing direct access to South Texas and export markets. An approximately 85-mile 36-inch lateral provides connectivity to the Midland Basin.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. MPLX also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About WhiteWater

WhiteWater is a management owned, Austin based midstream company. WhiteWater is partnered with multiple private equity funds including but not limited to Ridgemont Equity Partners and First Infrastructure Capital. Since inception, WhiteWater has reached final investment decision on ~$3 billion in greenfield development projects. For more information about WhiteWater, visit www.whitewatermidstream.com.

About Ridgemont Equity Partners

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested over $5.5 billion. The firm focuses on equity investments up to $250 million and utilizes a proven, industry-focused investment approach and repeatable value creation strategies. For more information about Ridgemont, visit www.ridgemontep.com.

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

About Stonepeak

Stonepeak is a leading alternative investment firm specializing in infrastructure and real assets with approximately $43.5 billion of assets under management. Through its investment in defensive, hard-asset businesses globally, Stonepeak aims to create value for its investors and portfolio companies, and to have a positive impact on the communities in which it operates. Stonepeak sponsors investment vehicles focused on private equity and credit. The firm provides capital, operational support, and committed partnerships to sustainably grow investments in its target sectors, which include transport and logistics, communications, water, energy transition, and power and renewable energy. Stonepeak is headquartered in New York with offices in Austin, Hong Kong, Houston, and Sydney. For more information, please visit https://stonepeakpartners.com/.

About WTG

WTG (together with its affiliates) comprises a family of related natural gas midstream and downstream entities headquartered in Midland, Texas since 1976 with operations in more than 90 Texas and Oklahoma counties. These WTG entities operate more than 900 MMcfd of gas processing capacity with more than 9,000 miles of gathering systems, 1,800 miles of transmission pipelines and distribution systems serving approximately 25,000 LDC customers.

Contacts

MPLX LP Investor Relations: Kristina Kazarian (419) 421-2071

WhiteWater Investor Relations: www.whitewatermidstream.com

Stonepeak: Kate Beers (646) 540-5225

WTG Investor Relations: www.westtexasgas.com

Some of the above statements constitute forward-looking statements. Forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond the control of the companies named herein and are difficult to predict. Factors that could impact the opportunities described above include but are not limited to general domestic and international economic and political conditions and the factors described in MPLX’s filings with the Securities and Exchange Commission (SEC). Any forward-looking statement speaks only as of the date of the applicable communication and the companies named herein undertake no obligation to update any forward-looking statement except to the extent required by applicable law. Copies of MPLX's Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and other SEC filings are available on the SEC's website, MPLX's website at http://ir.mplx.com or by contacting MPLX's Investor Relations office.

Concurrent with Rattler’s investment in the project,Diamondback Energy, Inc. (NASDAQ: FANG),Rattler’s upstream operating parent, entered into a significant, long-termnatural gas liquids (NGL)product dedication withBANGL.

BANGLbegan full commercial service in the fourth quarter of 2021 and provides NGL takeaway capacity from MPLX and WTG gas processing plants in the Permian Basin to the NGL fractionation hub in Sweeny, Texas. WhiteWater’sinvestment in BANGL is backed by Ridgemont Equity Partners, Denham Capital Management and the Ontario Power Generation Inc. Pension Plan.

About BANGL, LLC

BANGL is a joint venture between White Water, MPLX, WTG, and Rattler. The natural gas liquids pipeline system connects the Delaware and Midland basins of Texas to the fractionation market in Sweeny, Texas and has expansion capacity of up to300,000 barrels per day.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com.

About WhiteWater

WhiteWater is a management owned, Austin based midstream company. WhiteWater is partnered with multiple private equity funds including but not limited to Ridgemont Equity Partners, Denham Capital Management, First Infrastructure Capital and the Ontario Power Generation Inc. Pension Plan. Since inception, WhiteWater has reached final investment decision on ~$3 billion in greenfield development projects. For more information about WhiteWater, visit www.whitewatermidstream.com.

About WTG

WTG (together with its affiliates) comprises a family of related natural gas midstream and downstream entities headquartered in Midland, Texas since 1976 with operations in more than 90 Texas and Oklahoma counties. These WTG entities operate more than 900 MMcfd of gas processing capacity with more than 9,000 miles of gathering systems, 1,800 miles of transmission pipelines and distribution systems serving approximately 25,000 LDC customers.

About Rattler Midstream LP

Rattler is a Delaware limited partnership formed by Diamondback Energy, Inc. to own, operate, develop and acquire midstream and energy-related infrastructure assets. Rattler owns crude oil, natural gas and water-related midstream assets in the Permian Basin that provide services to Diamondback Energy, Inc. and third party customers under primarily long-term, fixed-fee contracts. For more information, please visit www.rattlermidstream.com.

About Diamondback Energy, Inc.

Diamondback Energy, Inc. is an independent oil and natural gas company headquartered in Midland, Texas focused on the acquisition, development, exploration and exploitation of unconventional, onshore oil and natural gas reserves in the Permian Basin in West Texas. For more information, please visit www.diamondbackenergy.com.

About Ridgemont Equity Partners

Ridgemont Equity Partners (Ridgemont) is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested over $5.5 billion. The firm focuses on equity investments up to $250 million and utilizes a proven, industry-focused investment approach and repeatable value creation strategies. For more information about Ridgemont, visit www.ridgemontep.com.

About Denham Capital Management

Denham Capital Management (Denham) is a leading energy and resources-focused global private equity firm with more than $12 billion of invested and committed capital across multiple fund vehicles and offices in Houston, Boston, Toronto, London and Perth. The firm makes direct investments in the energy and resources sectors, including businesses involving energy resources, sustainable infrastructure and mining, across the globe and all stages of the corporate lifecycle. Denham’s investment professionals apply deep technical, operational and industry experience and work in close partnership with management teams to achieve long-term investment objectives. For more information about Denham Capital, visit www.denhamcapital.com.

Contacts

MPLX Investor Relations: Kristina Kazarian (419) 421-2071

WhiteWater Investor Relations: www.whitewatermidstream.com

WTG Investor Relations: www.westtexasgas.com

Rattler Investor Relations: Jared Carameros (432) 247-6213

WhiteWater’s investment in Agua Blanca is led by First Infrastructure Capital. Inquiries regarding the Agua Blanca pipeline system should be directed to ab@wwm-llc.com.

About WhiteWater

WhiteWater is an Austin based infrastructure company founded in 2016. WhiteWater has partnered with multiple private equity funds and direct investors since inception.

For more information about WhiteWater, visit www.whitewatermidstream.com.

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

The Whistler Pipeline is 100% owned by Whistler Pipeline LLC, which is a consortium made up of MPLX LP (NYSE: MPLX), WhiteWater and a joint venture between Stonepeak Infrastructure Partners (Stonepeak) and West Texas Gas, Inc. (WTG).

ABOUT THE WHISTLER PIPELINE

The Whistler Pipeline is an approximately 450-mile, 42-inch intrastate pipeline that transports natural gas from the Waha Header in the Permian Basin to Agua Dulce, Texas, providing direct access to South Texas and export markets. An approximately 50-mile 36-inch lateral provides connectivity to the Midland Basin.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets, and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About WhiteWater

WhiteWater is an Austin-based independent midstream company providing transportation services to domestic oil and gas plays. For more information about WhiteWater, visit www.whitewatermidstream.com.

About Stonepeak Infrastructure Partners

Stonepeak Infrastructure Partners (www.stonepeakpartners.com) is an infrastructure-focused private equity firm with over $15 billion of assets under management and with offices in New York, Houston and Austin. Stonepeak invests in long-lived, hard-asset businesses and projects that provide essential services to customers, and seeks to actively partner with high-quality management teams, facilitate operational improvements, and provide capital for growth initiatives.

About WTG

WTG (West Texas Gas, Inc. & affiliates) is composed of a family of related natural gas midstream and downstream entities headquartered in Midland, TX since 1976 with operations in more than 90 Texas and Oklahoma counties. These WTG entities operate more than 700 MMcf/d of gas processing capacity with more than 10,000 miles of gathering systems, 1,800 miles of transmission pipelines and distribution systems serving approximately 25,000 LDC customers.

This press release contains forward-looking statements within the meaning of the federal securities laws. These forward-looking statements relate to, among other things, statements with respect to forecasts regarding capacity, rates, incremental investment, market conditions and the market and operational opportunities discussed above. You can identify forward-looking statements by words such as "anticipate," "design," "estimate," "expect," "forecast," "plan," "project," "potential," "target," "could," "may," "should," "would," "will" or other similar expressions that convey the uncertainty of future events or outcomes. Such forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond the control of the companies and are difficult to predict. Factors that could impact the opportunities described above are set forth under the heading "Risk Factors" in MPLX's Annual Report on Form 10-K for the year ended Dec. 31, 2020, and Quarterly Reports on Form 10-Q, filed with the Securities and Exchange Commission (SEC). In addition, the forward-looking statements included herein could be affected by general domestic and international economic and political conditions. Unpredictable or unknown factors not discussed here or in MPLX's Form 10-K, Forms 10-Q and other filings with the SEC could also have material adverse effects on forward-looking statements. Any forward-looking statements speak only as of the date of the applicable communication and the companies undertake no obligation to update any forward-looking statements except to the extent required by applicable law. Copies of MPLX's Form 10-K, Forms 10-Q and other SEC filings are available on the SEC's website, MPLX's website at http://ir.mplx.com or by contacting MPLX's Investor Relations office.

Contacts

MPLX LP Investor Relations: Kristina Kazarian (419) 421-2071

WhiteWater Investor Relations: www.whitewatermidstream.com

Stonepeak Infrastructure Partners Investor Relations: Dan Schmitz (212) 907-5119

WTG Investor Relations: David B. Freeman (432) 682-4349

OPEN SEASON PROCEDURE AND DURATION

The open season will commence on Monday, April 12, 2021 and conclude at 5:00 PM CDT on Friday May 21, 2021. WhiteWater may, in its sole discretion, extend the duration of the open season at any time.

Any customer desiring firm storage services at the WGS facility must complete the Service Request Form (the “Service Request”) attached to the open season notice found at http://whitewatermidstream.com/projects. The Service Request must be signed by a duly authorized representative of the requesting customer, together with requesting customer’s completed nondisclosure agreement. All submittals should be sent via email to wgs@wwm-llc.com. Service Requests made during the open season will be subject to the negotiation and execution of a binding storage services agreement, which will be shared with interested parties upon receipt and review of the Service Requests.

Prior to close of the Open Season, Parties may submit questions concerning the Open Season to wgs@wwm-llc.com. WhiteWater will post any clarifications provided in response to submitted inquiries at www.whitewatermidstream.com.

ABOUT THE WAHA GAS STORAGE FACILITY

WhiteWater’s Waha Gas Storage facilities are underground salt caverns located in Pecos County, Texas, immediately adjacent to the Agua Blanca header system. The Waha Gas Storage facilities will be connected to Agua Blanca’s Waha header system and natural gas may be physically received from or delivered to the interconnecting facilities on the header. With six existing caverns and five additional permitted caverns, the facilities can provide approximately 10 Bcf of storage capacity once fully developed.

The 2 Bcf of storage capacity will be associated with 200,000 MMBtu/d of Maximum Daily Injection Quantities (“MDIQ”) and Maximum Daily Withdrawal Quantities (“MDWQ”). Each customer will be granted MDIQ and MDWQ rights pro-rated to their total capacity commitments.

ABOUT WHITEWATER MIDSTREAM

WhiteWater Midstream is a management owned, Austin based infrastructure company. WhiteWater Midstream is partnered with multiple private equity funds including but not limited to Ridgemont Equity Partners, Denham Capital Management, First Infrastructure Capital and the Ontario Power Generation Inc. Pension Plan. Since inception, WhiteWater has reached final investment decision on ~$3 billion in greenfield development projects. For more information about WhiteWater Midstream, visit www.whitewatermidstream.com.

Contacts

WhiteWater Midstream

Caleb Ryan

Senior Vice President of Operations

(512) 953-2105

wgs@wwm-ll.com

Bryan Willoughby

Director Business Development

(512) 953-2107

wgs@wwm-llc.com

The Agua Blanca system is connected to almost 20 gas processing sites in the Delaware Basin and is currently transporting gas produced in Culberson, Loving, Reeves, Pecos, Winkler and Ward counties in Texas, and Eddy and Lea counties in New Mexico, to the Waha Hub. The Agua Blanca expansion includes a 42-inch diameter trunk line that more than doubles system capacity to over 3 Bcf/d while providing significant incremental takeaway capacity for plants servicing Texas and New Mexico gas producers.

“We are excited to bring this expansion into service ahead of schedule while continuing to provide reliable and transparent transportation services to producers and processors in Texas and New Mexico,” said WhiteWater Chief Executive Officer Christer Rundlof. “WWM remains committed to developing premier Permian basin residue assets as markets normalize and growth resumes.”

WhiteWater Midstream’s investment in the Agua Blanca joint venture is led by First Infrastructure Capital. Inquiries regarding the Agua Blanca Expansion should be directed to ab@wwm-llc.com.

About WhiteWater Midstream

WhiteWater Midstream is a management owned, Austin based midstream company. WhiteWater Midstream is partnered with multiple private equity funds including but not limited to Ridgemont Equity Partners, Denham Capital Management, First Infrastructure Capital and the Ontario Power Generation Inc. Pension Plan. Since inception, WhiteWater has reached final investment decision on ~$3 billion in greenfield development projects. For more information about WhiteWater Midstream, visit www.whitewatermidstream.com.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

Investor Relations Contacts:

WhiteWater Midstream
Bryan Willoughby
Director, Business Development
(512) 953-2100
www.whitewatermidstream.com

MPLX
Kristina Kazarian
Vice President, Investor Relations
(419) 421-2071

This press release contains forward-looking statements within the meaning of the federal securities laws. These forward-looking statements relate to, among other things, statements with respect to forecasts regarding capacity, rates, incremental investment, market conditions and timing for becoming operational for the opportunities discussed above. You can identify forward-looking statements by words such as "anticipate," "design," "estimate," "expect," "forecast," "plan," "project," "potential," "target," "could," "may," "should," "would," "will" or other similar expressions that convey the uncertainty of future events or outcomes. Such forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond the control of the companies and are difficult to predict. Factors that could impact the opportunities described above are set forth under the heading "Risk Factors" in MPLX's Annual Report on Form 10-K for the year ended Dec. 31, 2019, and Quarterly Reports on Form 10-Q, filed with the Securities and Exchange Commission (SEC). In addition, the forward-looking statements included herein could be affected by general domestic and international economic and political conditions. Unpredictable or unknown factors not discussed here or in MPLX's Forms 10-K and 10-Q could also have material adverse effects on forward-looking statements. Copies of MPLX's Forms 10-K and 10-Q are available on the SEC's website, MPLX's website at http://ir.mplx.com or by contacting MPLX's Investor Relations office.

The JV will provide an optimized approach to pipeline transportation service for NGLs primarily through the utilization of existing infrastructure with limited initial construction. The solution will facilitate future, capital-efficient expansions that meet customer demands in a recovering basin. The JV is supported by volumes from key processing plants with long-term commitments from top-tier Permian producers.

As part of this NGL transportation solution, the JV has entered into multiple capacity arrangements from Orla, TX to Sweeny, TX including an agreement with EPIC Y-Grade Pipeline LP (EPIC) to own an undivided joint interest (UJI) in EPIC’s existing 24” NGL pipeline from West Texas to the Eagle Ford Basin.

About WhiteWater Midstream

WhiteWater Midstream is a management owned, Austin based midstream company. WhiteWater Midstream is partnered with multiple private equity funds including but not limited to Ridgemont Equity Partners, Denham Capital Management, First Infrastructure Capital and the Ontario Power Generation Inc. Pension Plan. Since inception, WhiteWater has reached final investment decision on ~$3 billion in greenfield development projects. For more information about WhiteWater Midstream, visit www.whitewatermidstream.com.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About WTG

WTG (West Texas Gas, Inc. & affiliates) is composed of a family of related natural gas midstream and downstream entities headquartered in Midland, TX since 1976 with operations in more than 90 Texas and Oklahoma counties. These WTG entities operate more than 900 MMcfd + of gas processing capacity with more than 10,000 miles of gathering systems, 1,800 miles of transmission pipelines and distribution systems serving approximately 25,000 LDC customers.

About Ridgemont Equity Partners

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested approximately $5.0 billion. The firm focuses on equity investments up to $250 million in industries in which it has deep expertise, including business and industrial services, energy and sustainable strategies, healthcare, and technology and telecommunications. For more information about Ridgemont Equity Partners, visit www.ridgemontep.com.

About Denham Capital Management

Denham Capital is a leading energy and resources-focused global private equity firm with more than $9.7 billion of committed capital across eleven fund vehicles and offices in Houston, Boston, London and Perth. The firm makes direct investments in the energy and resources sectors, including businesses involving oil and gas, power generation and mining, across the globe and all stages of the corporate lifecycle. Denham’s investment professionals apply deep technical, operational and industry experience and work in close partnership with management teams to achieve long-term investment objectives. For more information about Denham Capital, visit www.denhamcapital.com.

Investor Relations Contacts:

MPLX: Kristina Kazarian, Vice President, Investor Relations, (419) 421-2071

WhiteWater Midstream: www.whitewatermidstream.com

WTG: David B. Freeman, VP of Business Development, (432) 682-4349

MPLX Media Contacts:

Hamish Banks, Vice President, Communications (419) 421-2521

Jamal Kheiry, Manager, Communications (419) 421-3312

OPEN SEASON PROCEDURE AND DURATION

The Open Season will commence on Friday, November 15, 2019 and conclude at 5:00 PM CST on Monday December 16, 2019. Whistler Pipeline may, at its sole discretion, extend the duration of the Open Season at any time during the Open Season.

Whistler Pipeline asks that interested shippers submit, confidentially, a completed Service Request Form.The Service Request form, along with additional information regarding the Whistler Pipeline can be found at http://whitewatermidstream.com/operations.

Prior to close of the Open Season, Parties may submit questions concerning the Open Season to whistler@wwm-llc.com. WhiteWater Midstream, one of the consortium members, will post any clarifications provided in response to submitted inquiries at www.whitewatermidstream.com.

ABOUT THE WHISTLER PIPELINE

The Whistler Pipeline is an approximately 450-mile, 42-inch intrastate pipeline (the “Whistler Mainline”) that will transport natural gas from an interconnect with the Waha Header near Coyanosa, Texas in the Permian Basin to a terminus near Agua Dulce, Texas, providing direct access to South Texas markets and consumers. An approximately 50-mile 36-inch lateral will provide connectivity for gas processors in the Midland Basin. The pipeline will have transportation capacity of 2 billion cubic feet per day (Bcf/d).

Whistler Pipeline has contracted for the supply of the entirety of 42”/36” steel pipeline needed to complete the project and is on schedule in its completion of survey along the planned route and acquisition of appropriate permits for a summer 2021 in-service date.Construction will commence in 2020.

About Whistler Pipeline LLC

Whistler Pipeline LLC is a consortium made up of MPLX LP (NYSE: MPLX), WhiteWater Midstream (Whitewater) and a joint venture between Stonepeak Infrastructure Partners (Stonepeak) and West Texas Gas, Inc. (WTG).

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets, and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About WhiteWater Midstream

WhiteWater Midstream is an Austin-based independent midstream company providing transportation services to domestic oil and gas plays. For more information about WhiteWater Midstream, visit www.whitewatermidstream.com.

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

About Stonepeak Infrastructure Partners

Stonepeak Infrastructure Partners (www.stonepeakpartners.com) is an infrastructure-focused private equity firm with over $15 billion of assets under management and with offices in New York, Houston and Austin. Stonepeak invests in long-lived, hard-asset businesses and projects that provide essential services to customers, and seeks to actively partner with high-quality management teams, facilitate operational improvements, and provide capital for growth initiatives.

About WTG

WTG (West Texas Gas, Inc. & affiliates) is composed of a family of related natural gas midstream and downstream entities headquartered in Midland, TX since 1976 with operations in more than 90 Texas and Oklahoma counties.These WTG entities operate more than 700 MMcf/d of gas processing capacity with more than 10,000 miles of gathering systems, 1,800 miles of transmission pipelines and distribution systems serving approximately 25,000 LDC customers.

Contacts

MPLX LP Investor Relations: Kristina Kazarian (419) 421-2071

WhiteWater Midstream Investor Relations: www.whitewatermidstream.com

Stonepeak Infrastructure Partners Investor Relations: Dan Schmitz (212) 907-5119

WTG Investor Relations: David B. Freeman (432) 682-4349

Inquiries regarding the Agua Blanca Expansion should be directed to ab@wwm-llc.com.

About WhiteWater Midstream

WhiteWater Midstream is an Austin-based independent midstream company providing transportation services to domestic oil and gas plays. For more information about WhiteWater Midstream, visit www.whitewatermidstream.com.

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets, and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

Contacts

WhiteWater Midstream Investor Relations: www.whitewatermidstream.com

MPLX LP Investor Relations: Kristina Kazarian (419) 421-2071

The Whistler Pipeline is being designed to transport approximately 2 billion cubic feet per day (Bcf/d) of natural gas through approximately 475 miles of 42-inch pipeline from Waha, Texas, to the Agua Dulce area in South Texas. Supply for the Whistler Pipeline would be sourced from multiple upstream connections in the Permian Basin, including direct connections to plants in the Midland Basin through an approximately 50 mile, 30-inch pipeline lateral, as well as a direct connection to the 1.4 Bcf/d Agua Blanca Pipeline, a joint venture between WhiteWater, MPLX and Targa. Agua Blanca Pipeline crosses through the heart of the Delaware Basin, including portions of Culberson, Loving, Pecos, Reeves, Winkler and Ward counties.

“The decision to move forward with this project after securing sufficient commitments from shippers demonstrates our disciplined approach to investing,” said Gary R. Heminger, MPLX chairman and chief executive officer. “Whistler is expected to provide reliable residue gas transportation out of the Permian Basin, which is vital to our growing gas processing position and producers in the region.”

“The WhiteWater team is excited to partner with MPLX and develop incremental transportation out of the Permian Basin, as production continues to dramatically outperform consensus estimates,” added Christer Rundlof, CEO of WhiteWater. “Whistler will tie directly into the most attractive markets in South Texas, including the growing LNG and Mexican markets.”

The Whistler Pipeline is expected to be in Service in the third quarter of 2021, pending the receipt of customary regulatory and other approvals.

About MPLX LP

MPLX is a diversified, large-cap master limited partnership that owns and operates midstream energy infrastructure and logistics assets, and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins. More information is available at www.MPLX.com

About WhiteWater Midstream

WhiteWater Midstream is an Austin based, independent midstream company that provides transportation services to domestic oil and gas plays. WhiteWater was founded in 2016 and is backed by significant commitments from First Infrastructure Capital. For more information about WhiteWater Midstream, visit www.whitewatermidstream.com.

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is affiliated with Quanta Services and operated separately as an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

About Stonepeak Infrastructure Partners

Stonepeak Infrastructure Partners (www.stonepeakpartners.com) is an infrastructure-focused private equity firm with over $15 billion of assets under management and with offices in New York, Houston and Austin. Stonepeak invests in long-lived, hard-asset businesses and projects that provide essential services to customers, and seeks to actively partner with high-quality management teams, facilitate operational improvements, and provide capital for growth initiatives.

About WTG

WTG (West Texas Gas, Inc. & affiliates) is composed of a family of related natural gas midstream and downstream entities headquartered in Midland, TX since 1976 with operations in more than 90 Texas and Oklahoma counties. These WTG entities operate more than 700 MMcfd of gas processing capacity with more than 10,000 miles of gathering systems, 1,800 miles of transmission pipelines and distribution systems serving approximately 25,000 LDC customers.

CONTACTS

MPLX LP Investor Relations: Kristina Kazarian – (419) 421-2071

WhiteWater Midstream Investor Relations: www.whitewatermidstream.com

Stonepeak Infrastructure Partners Investor Relations: Dan Schmitz – +1 (212) 907-5119

WTG Investor Relations: David B. Freeman – 432-682-4349

Forward-looking statements

This press release contains forward-looking statements within the meaning of the federal securities laws. These forward-looking statements relate to, among other things, statements with respect to forecasts regarding capacity and timing for becoming operational for the opportunities discussed above. You can identify forward-looking statements by words such as "anticipate," "believe," "design," "estimate," "expect," "forecast," "intend," "plan," "project," "potential," "could," "may," "should," "would," "will" or other similar expressions that convey the uncertainty of future events or outcomes. Such forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond the control of the companies and are difficult to predict. Although management of the respective companies believe any such statements are based on reasonable assumptions, there is no assurance that actual outcomes will not be materially different. Among the key risk factors associated with the project that may have a direct impact on completion of the project and construction of the pipeline or the pipeline's and the companies' results of operations and financial condition are: (1) the ability of the companies to negotiate and enter into definitive agreements and to obtain all required rights-of-way, permits and other approvals on a timely basis; (2) the ability to complete construction of the project on time and at expected costs; (3) price fluctuations and overall demand for natural gas; (4) changes in the pipeline's tariff rates or other terms as required by state or federal regulatory authorities; (5) the occurrence of an operational hazard or unforeseen interruption; (6) disruption in the debt and equity markets that negatively impacts the companies' abilities to finance capital spending and (7) willingness to incur or failure of customers or vendors to meet or continue contractual obligations related to this project. Additional information about issues that could lead to material changes in performance is set forth under the heading "Risk Factors" in MPLX's Annual Report on Form 10-K for the year ended Dec. 31, 2018, filed with the Securities and Exchange Commission (SEC). In addition, the forward-looking statements included herein could be affected by general domestic and international economic and political conditions. Unpredictable or unknown factors not discussed here or in MPLX's Form 10-K could also have material adverse effects on forward-looking statements. Copies of MPLX's Form 10-K are available on the SEC website, MPLX's website at http://ir.mplx.com or by contacting MPLX's Investor Relations office. The companies undertake no obligation to revise these forward-looking statements to reflect events or circumstances occurring after today's date.

AUSTIN & HOUSTON, TEXAS – February 4, 2019 – WhiteWater Midstream (“WhiteWater”) and its financial sponsors, Denham Capital Management (“Denham”) and Ridgemont Equity Partners (“Ridgemont”), announced today that they have entered into definitive agreements for the sale of WhiteWater to funds managed by First Infrastructure Capital Advisors, LLC (“First Infrastructure Capital”).

As part of the transaction, First Infrastructure Capital will acquire WhiteWater, including its 60% stake in Agua Blanca, a Delaware Basin intrastate natural gas pipeline system. Contemporaneous with this transaction, First Infrastructure Capital also entered into definitive agreements to acquire WPX Energy, Inc.’s 20% ownership stake in Agua Blanca. WhiteWater management will remain with the asset and is committed to growing Agua Blanca to service its customer base.Closing is expected in the first quarter of 2019 and is subject to customary approvals and closing conditions.

Agua Blanca is a natural gas residue pipeline servicing the Delaware Basin. The system consists of ~90 miles of 36” diameter pipeline and 70 miles of smaller diameter pipeline crossing portions of Culberson, Loving, Pecos, Reeves, Ward and Winkler counties. The initial capacity is ~1.4 Bcf/d with significant expansion plans underway. The asset is supported by multiple, substantial, long-term, take or pay contracts. The Agua Blanca system has a multitude of direct downstream connections which provide shippers on the system access to multiple markets.

Christer Rundlof, CEO of WhiteWater said, “We are very excited about our new partnership with First Infrastructure Capital, who provides us with access to strong construction and operations expertise and access to significant capital to continue to expand the Agua Blanca system and execute other projects under development.WhiteWater is committed to continuing to partner with shippers in the Delaware Basin.Our new sponsor has a long investment horizon that will allow us to continue to manage the asset for the long term.”

Christer continued, “We are grateful to have had Denham and Ridgemont as trusted partners. We appreciate their confidence in backing WhiteWater as a first-time team.Denham and Ridgemont’s energy sector expertise has been an important part of our team’s success. We are also extremely grateful to our joint venture partners and other anchor shippers who allowed us to grow the Agua Blanca system so quickly.MarkWest, Targa and WPX have been outstanding partners throughout the development of Agua Blanca. We look forward to the opportunity to work together on future projects.”

Dan Shapiro, Managing Partner of First Infrastructure Capital Advisors, LLC said, “WhiteWater has created a unique cornerstone infrastructure asset that maximizes natural gas take-away options for producers in the Delaware Basin.We look forward to working closely with the team to invest significant capital in expansions of the Agua Blanca system, other natural gas residue, natural gas liquids, and complementary energy infrastructure projects.”

Jordan Marye, Managing Partner of Denham said, “We congratulate the entire WhiteWater team on their success in building a progressive midstream business focused on delivering value to shippers in the Delaware Basin and beyond. We are excited to continue to partner with WhiteWater, First Infrastructure Capital and Ridgemont on future projects under development.”

Tudor, Pickering, Holt & Co. and Credit Suisse Securities (USA) LLC acted as financial advisors to WhiteWater, Denham, and Ridgemont in connection with the transaction. Simmons Energy, A Division of Piper Jaffray, acted as the exclusive financial advisor to First Infrastructure Capital. Sidley Austin LLP acted as lead counsel for WhiteWater and Denham. Troutman Sanders LLP acted as lead counsel for Ridgemont.Latham & Watkins LLP acted as lead counsel for WhiteWater management.Milbank, Tweed, Hadley & McCloy LLP acted as lead counsel for First Infrastructure Capital.

About WhiteWater Midstream

WhiteWater Midstream is an Austin based, independent midstream company that provides transportation services to domestic oil and gas plays.

About Denham Capital Management

Denham Capital is a leading energy and resources-focused global private equity firm with more than $9.7 billion of invested and committed capital across 10 fund vehicles and offices in Houston, London, Boston and Perth. The firm makes direct investments in the energy and resources sectors, including businesses involving oil and gas, power generation and mining, across the globe and all stages of the corporate lifecycle. Denham’s investment professionals apply deep operational and industry experience and work in partnership with management teams to achieve long-term investment objectives. For more information about Denham Capital, visit www.denhamcapital.com

About Ridgemont Equity Partners

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested approximately $4.4 billion. The firm focuses on equity investments up to $250 million in industries in which it has deep expertise, including business and industrial services, energy, healthcare, and technology and telecommunications. www.ridgemontep.com

About First Infrastructure Capital

First Infrastructure Capital Advisors, LLC is a Houston-based investment firm specializing in greenfield projects and companies operating in the midstream, downstream, electric power, telecommunications, and renewable energy industries. First Infrastructure Capital Advisors, LLC is affiliated with Quanta Services and operated separately as an SEC-registered investment adviser, which manages funds affiliated with First Infrastructure Capital, L.P. For more information about First Infrastructure Capital, visit www.firstinfracap.com.

Agua Blanca now has over 1.1 Bcf/d of long-term firm commitments.The pipeline has also continued to expand its connectivity with agreements in place with the following processors:Brazos Midstream, Crestwood Midstream Partners, EnLink Midstream Partners and Medallion Midstream.These agreements will bring total plant processing capacity connected to Agua Blanca to nearly 2.5 Bcf/d, which is expected to increase to 5.0 Bcf/d in the near-term.

“We are extremely excited about our new strategic partners, MPLX and Targa.Both companies are top tier processors that continue to expand services in the Permian Basin.We look forward to growing Agua Blanca and derivative projects with our strong customer base,” said WhiteWater Chief Executive Officer Christer Rundlof.

WhiteWater Midstream will own a 60 percent equity interest in Agua Blanca, with WPX Energy, MPLX and Targa owning an equity interest of 20%, 10% and 10%, respectively in the project.

Inquiries regarding Agua Blanca should be directed to ab@wwm-llc.com.

ABOUT AGUA BLANCA

Agua Blanca is a natural gas residue pipeline servicing the Delaware Basin.The mainline consists of approximately 90 miles of 36” diameter pipeline and 70 miles of 12” to 24” diameter pipeline crossing portions of Culberson, Loving, Pecos, Reeves, Winkler, and Ward counties.The initial capacity is approximately 1.4 Bcf/d.The project is supported by multiple, substantial long-term, firm volume commitments.Agua Blanca will have multiple direct downstream connections including to the Trans-Pecos Header, El Paso Waha, ONEOK West Texas, Kinder Morgan’s Gulf Coast Express and Natural Gas Pipeline Company.

ABOUT WHITEWATER MIDSTREAM

WhiteWater Midstream is an Austin based, independent midstream company that provides transportation services to domestic oil and gas plays.WhiteWater was founded in 2016 and is backed by equity commitments from Denham Capital Management and Ridgemont Equity Partners.For more information about WhiteWater, visit www.whitewatermidstream.com.

ABOUT WPX ENERGY

WPX is an independent energy producer with core positions in the Permian and Williston basins. WPX’s production is approximately 80 percent oil/liquids and 20 percent natural gas. The company also has an emerging infrastructure portfolio in the Permian Basin.

ABOUT MPLX LP

MPLX is a diversified, growth-oriented master limited partnership formed in 2012 by Marathon Petroleum Corporation (MPC) to own, operate, develop and acquire midstream energy infrastructure assets. MPLX is engaged in the gathering, processing and transportation of natural gas; the gathering, transportation, fractionation, storage and marketing of NGLs; and the transportation, storage and distribution of crude oil and refined petroleum products through a marine fleet and approximately 10,000 miles of crude oil and light product pipelines. Headquartered in Findlay, Ohio, MPLX's assets consist of a network of crude oil and products pipelines and supporting assets, including storage facilities (tank farms) located in the Midwest and Gulf Coast regions of the United States; 62 light-product terminals with approximately 24 million barrels of storage capacity; storage caverns with approximately 2.8 million barrels of storage capacity; a barge dock facility with approximately 78,000 barrels per day of crude oil and product throughput capacity; and gathering and processing assets that include approximately 5.9 billion cubic feet per day of gathering capacity, 8.2 billion cubic feet per day of natural gas processing capacity and 610,000 barrels per day of fractionation capacity. In addition, MPLX provides fuels distribution services to MPC and owns refining logistics assets consisting of tanks with storage capacity of approximately 56 million barrels as well as refinery docks, loading racks and associated piping.

ABOUT TARGA RESOURCES CORP.

Targa Resources Corp. (NYSE: TRGP) is a leading provider of midstream services and is one of the largest independent midstream energy companies in North America. Targa owns, operates, acquires, and develops a diversified portfolio of complementary midstream energy assets. The Company is primarily engaged in the business of gathering, compressing, treating, processing and selling natural gas; storing, fractionating, treating, transporting, and selling NGLs and NGL products, including services to LPG exporters; gathering, storing, terminaling, and selling crude oil; storing, terminaling, and selling refined petroleum products.

For more information, please visit www.targaresources.com.

ABOUT DENHAM CAPITAL

Denham Capital is a leading energy-focused global private equity firm with more than $8.4 billion of invested and committed capital across eight fund vehicles. The firm makes direct investments across all stages of the corporate lifecycle. Denham’s investment professionals apply deep operational and industry experience and work in partnership with management teams to achieve long-term investment objectives. For more information about Denham Capital, visit www.denhamcapital.com.

ABOUT RIDGEMONT EQUITY PARTNERS

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested over $3.5 billion in 136 companies. The firm focuses on investments of $25 million to $100 million in industries in which it has deep expertise, including basic industries and services, energy, healthcare and telecommunications/media/technology. For more information about Ridgemont, visit www.ridgemontep.com.

The project is supported by substantial long-term, firm volume commitments. WhiteWater is in the process of expanding Agua Blanca’s connectivity and is considering a number of options to expand overall pipeline capacity.

Inquiries regarding Agua Blanca should be directed to ab@wwm-llc.com.

ABOUT WHITEWATER MIDSTREAM

WhiteWater Midstream is an Austin based, independent infrastructure company that provides transportation services to domestic oil and gas plays.WhiteWater was founded in 2016 and is backed by equity commitments from Denham Capital Management and Ridgemont Equity Partners.For more information about WhiteWater, visit www.whitewatermidstream.com.

ABOUT DENHAM CAPITAL

Denham Capital is a leading energy-focused global private equity firm with more than $8.4 billion of invested and committed capital across eight fund vehicles. The firm makes direct investments across all stages of the corporate lifecycle. Denham’s investment professionals apply deep operational and industry experience and work in partnership with management teams to achieve long-term investment objectives. For more information about Denham Capital, visit www.denhamcapital.com.

ABOUT RIDGEMONT EQUITY PARTNERS

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested over $3.5 billion in 136 companies. The firm focuses on investments of $25 million to $100 million in industries in which it has deep expertise, including basic industries and services, energy, healthcare and telecommunications/media/technology. For more information about Ridgemont, visit www.ridgemontep.com.

Construction of Agua Blanca remains on schedule with the initial commissioning of the project expected during the fourth quarter of 2017 and the complete path from Orla to Waha operational by the end of the first quarter of 2018.

“We are excited to be partnering with a company the caliber of WPX on Agua Blanca. Their team has done an extraordinary job in the Delaware Basin positioning WPX for substantial growth over the coming years. WPX is subscribing for a significant amount of capacity on the pipe, and with potential future Permian growth and strong interest from additional shippers, we are already considering expansion options for Agua Blanca,” said WhiteWater Chief Executive Officer Christer Rundlof.

Inquiries regarding Agua Blanca should be directed to ab@wwm-llc.com.

ABOUT AGUA BLANCA

Agua Blanca will initially consist of 75 miles of 36” diameter pipe with a capacity of 1.25 Bcf/d, expandable to 1.75 Bcf/d with minimal capex. The project is supported by substantial long-term, firm volume commitments. The initial path of Agua Blanca will be from Orla, Texas to the Waha Hub, servicing portions of Culberson, Loving, Pecos, Reeves and Ward counties. Agua Blanca will have multiple direct downstream connections including to the Trans-Pecos Header.

ABOUT WHITEWATER MIDSTREAM

WhiteWater Midstream is an Austin based, independent midstream company that provides gathering, treating, processing and transportation services to domestic oil and gas plays. WhiteWater was founded in 2016 and is backed by equity commitments from Denham Capital Management and Ridgemont Equity Partners. For more information about WhiteWater, visit www.whitewatermidstream.com.

ABOUT DENHAM CAPITAL

Denham Capital is a leading energy-focused global private equity firm with more than $8.4 billion of invested and committed capital across eight fund vehicles. The firm makes direct investments across all stages of the corporate lifecycle. Denham’s investment professionals apply deep operational and industry experience and work in partnership with management teams to achieve long-term investment objectives. For more information about Denham Capital, visit www.denhamcapital.com.

ABOUT RIDGEMONT EQUITY PARTNERS

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested over $3.5 billion in 136 companies. The firm focuses on investments of $25 million to $100 million in industries in which it has deep expertise, including basic industries and services, energy, healthcare and telecommunications/media/technology. For more information about Ridgemont, visit www.ridgemontep.com.

Agua Blanca will initially consist of 75 miles of 36” diameter pipe with a capacity of 1.25 Bcf/d, expandable to 1.75 Bcf/d. The project is supported by over 500 MMcf/d of long-term, firm volume commitments. WhiteWater expects to accept first volumes by the fourth quarter of 2017.

“Agua Blanca will provide producers and processors with a much needed outlet for the rapidly growing natural gas volumes in the Delaware Basin. Our customers will have a direct path to multiple delivery points including the attractive, growing Mexican power market,” said WhiteWater Chief Executive Officer Christer Rundlof.

Inquiries regarding Agua Blanca should be directed to ab@wwm-llc.com.

ABOUT WHITEWATER MIDSTREAM

WhiteWater Midstream is an Austin based, independent midstream company that provides gathering, treating, processing and transportation services to domestic oil and gas plays. WhiteWater was founded in 2016 and is backed by equity commitments from Denham Capital Management and Ridgemont Equity Partners. For more information about WhiteWater, visit www.whitewatermidstream.com.

ABOUT DENHAM CAPITAL

Denham Capital is a leading energy-focused global private equity firm with more than $8.4 billion of invested and committed capital across eight fund vehicles. The firm makes direct investments across all stages of the corporate lifecycle. Denham’s investment professionals apply deep operational and industry experience and work in partnership with management teams to achieve long-term investment objectives. For more information about Denham Capital, visit www.denhamcapital.com.

ABOUT RIDGEMONT EQUITY PARTNERS

Ridgemont Equity Partners is a Charlotte-based middle market buyout and growth equity investor. Since 1993, the principals of Ridgemont have invested over $3.5 billion in 136 companies. The firm focuses on investments of $25 million to $100 million in industries in which it has deep expertise, including basic industries and services, energy, healthcare and telecommunications/media/technology. For more information about Ridgemont, visit www.ridgemontep.com.