Breen Haire is Co-Managing Partner of Simpson Thacher’s Houston office and Co-Head of the Firm’s Energy and Infrastructure Practice. Breen focuses on mergers and acquisitions and private equity transactions across the infrastructure sector, including in the energy, digital infrastructure and transportation industries. His energy experience includes representing major operating companies and investors in the power, renewables and oil and gas exploration and production, midstream, oilfield services, contract drilling and petrochemicals sectors.
A Chambers-ranked practitioner, Breen was named as “2025 Dealmaker of the Year” by The American Lawyer and “Top 2024 Texas M&A dealmaker,” by Texas Lawbook. In addition, he has been recognized as a “Rising Star” by Texas Monthly and a “Texas Trailblazer” by Texas Lawyer.
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Work Highlights
- KKR and PSP in the acquisition of a 19.9% interest in American Electric Power’s Ohio and Indiana & Michigan transmission companies for $2.82 billion
- KKR in its establishment of a joint venture with T-Mobile to acquire Metronet
- WhiteWater in its joint venture with an affiliate of Targa Resources Corp. to construct Blackcomb Pipeline
- KKR in its acquisition of an indirect minority equity interest in the Labrador Island Link from Emera Inc.
- KKR in its agreement with Hannon Armstrong Sustainable Infrastructure Capital, Inc. under which the parties will establish CarbonCount Holdings 1 LLC to invest up to a combined $2 billion in climate positive projects across the United States
- ISQ Whistler Holdings, a portfolio company of WhiteWater Midstream and I Squared Capital, in the formation of a strategic natural gas pipeline joint venture with Enbridge Inc. and Marathon Petroleum
- KKR in its acquisition of approximately 1,100 wireless communications towers in Colombia from Tigo Colombia
- KKR in its acquisition and financing of an interest in the Port Arthur LNG Phase 1 Project from Sempra Infrastructure
- ISQ Whistler Holdings in the formation of a strategic natural gas pipeline joint venture with Enbridge Inc. and Marathon Petroleum
- KKR in its agreement with Telefónica Hispanoamérica and Entel Perú to acquire a majority interest in PangeaCo and the existing fiber optic networks of Telefónica del Perú and Entel Perú to build Perú’s first nationwide open access wholesale fiber optics company
- Goldman Sachs Asset Management in connection with its acquisition of ImOn Communications, LLC
- An infrastructure funds group affiliated with Goldman Sachs Asset Management in their equity investment in Synthica Energy
- KKR in connection with its acquisition of a majority stake in Refresco Group B.V. a global independent beverage solutions provider
- Atlantic Aviation in its acquisition of three fixed-base operations at Omaha, Nebraska; Raleigh-Durham, North Carolina; and Hartford, Connecticut
- KKR in connection with its acquisition of a majority stake in Telefónica Chile’s existing fiber optic network to establish Chile’s first open access wholesale fiber optics company
- KKR in the formation of Global Technical Realty, a build-to-suit and roll-up acquisition data center platform in Europe
- KKR in connection with its commitment to acquire commercial aircraft in partnership with Altavair AirFinance
- KKR in its $3.37 billion acquisition of a non-controlling, 20% interest in Sempra Infrastructure Partners
- Vistra Energy Corp., the parent company for TXU Energy and Luminant, in its completed merger with Dynegy Inc.
- KKR in its investment in MetroNet, the nation’s largest independently owned, 100 percent fiber optic network provider
Accolades
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“Dealmaker of the Year,” American Lawyer, 2025
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“Top 2024 Texas M&A dealmaker,” Texas Lawbook, 2024
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“Texas Trailblazer,” Texas Lawyer, 2020
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“Texas Rising Star,” Texas Monthly, 2007–2012
Education
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New York University School of Law, 1999 J.D.
magna cum laude; Editor, New York University Law Review; Order of the Coif
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Boston University, 1994 B.F.A.
summa cum laude
Breen Haire is Co-Managing Partner of Simpson Thacher’s Houston office and Co-Head of the Firm’s Energy and Infrastructure Practice.
Breen represents private equity investors and public and privately-held parties in negotiated acquisitions and dispositions, controlled auctions and investments. He works on transactions in the infrastructure sector, including in the energy, digital infrastructure, telecommunications and transportation industries. Breen’s experience in the energy sector includes representing operating companies and investors in the power, renewables and oil and gas exploration and production, midstream, oilfield services, contract drilling and petrochemicals industries.
A Chambers-ranked practitioner, Breen was named as “2025 Dealmaker of the Year” by The American Lawyer and “Top 2024 Texas M&A dealmaker,” by Texas Lawbook. In addition, he has been recognized as a “Rising Star” by Texas Monthly and a “Texas Trailblazer” by Texas Lawyer.
Breen's representative transactions include:
- KKR and PSP in the acquisition of a 19.9% interest in American Electric Power’s Ohio and Indiana & Michigan transmission companies for $2.82 billion
- KKR in its establishment of a joint venture with T-Mobile to acquire Metronet
- WhiteWater in its joint venture with an affiliate of Targa Resources Corp. to construct Blackcomb Pipeline
- KKR in its acquisition of an indirect minority equity interest in the Labrador Island Link from Emera Inc.
- KKR in its agreement with Hannon Armstrong Sustainable Infrastructure Capital, Inc. under which the parties will establish CarbonCount Holdings 1 LLC to invest up to a combined $2 billion in climate positive projects across the United States
- ISQ Whistler Holdings, a portfolio company of WhiteWater Midstream and I Squared Capital, in the formation of a strategic natural gas pipeline joint venture with Enbridge Inc. and Marathon Petroleum
- KKR in its acquisition of approximately 1,100 wireless communications towers in Colombia from Tigo Colombia
- KKR in its acquisition and financing of an interest in the Port Arthur LNG Phase 1 Project from Sempra Infrastructure
- ISQ Whistler Holdings in the formation of a strategic natural gas pipeline joint venture with Enbridge Inc. and Marathon Petroleum
- KKR in its agreement with Telefónica Hispanoamérica and Entel Perú to acquire a majority interest in PangeaCo and the existing fiber optic networks of Telefónica del Perú and Entel Perú to build Perú’s first nationwide open access wholesale fiber optics company
- Goldman Sachs Asset Management in connection with its acquisition of ImOn Communications, LLC
- An infrastructure funds group affiliated with Goldman Sachs Asset Management in their equity investment in Synthica Energy
- KKR in connection with its acquisition of a majority stake in Refresco Group B.V. a global independent beverage solutions provider
- Atlantic Aviation in its acquisition of three fixed-base operations at Omaha, Nebraska; Raleigh-Durham, North Carolina; and Hartford, Connecticut
- KKR in connection with its acquisition of a majority stake in Telefónica Chile’s existing fiber optic network to establish Chile’s first open access wholesale fiber optics company
- KKR in the formation of Global Technical Realty, a build-to-suit and roll-up acquisition data center platform in Europe
- KKR in connection with its commitment to acquire commercial aircraft in partnership with Altavair AirFinance
- KKR in its $3.37 billion acquisition of a non-controlling, 20% interest in Sempra Infrastructure Partners
- Vistra Energy Corp., the parent company for TXU Energy and Luminant, in its completed merger with Dynegy Inc.
- KKR in its investment in MetroNet, the nation’s largest independently owned, 100 percent fiber optic network provider
Breen received his J.D., magna cum laude, from New York University School of Law where he was an Editor of the New York University Law Review and a member of the Order of the Coif. He received his B.F.A., summa cum laude, from Boston University. Breen is admitted to practice in Texas.