More than just a sector, infrastructure is a fundamental driver of global economic, political and social progress. From our earliest days as a firm shaping the development of railroads, utilities, and aviation, Simpson Thacher has been an infrastructure powerhouse. Today, we remain at the vanguard of groundbreaking infrastructure developments, including across artificial intelligence, critical minerals, digital infrastructure, the energy transition, power, space and transportation.
1,000+
Transactions across the energy and infrastructure sector in the past five years alone (2021 – 2025)
Infrastructure Acquisition of the Year, North America
Winner - IJGlobal Investor Awards, 2025
#1 Ranked Legal Advisor, Digital Infrastructure Transactions (Globally)
Infralogic, 2025
We advise many of the key players — from infrastructure companies to financial sponsors, banks and investors active in the sector — on a broad range of activities throughout the world. We also provide counsel in the formation of infrastructure funds, as well as investments made by such funds. Our representations encompass the infrastructure sector, including:
- KKR in its $50 billion strategic partnership with Energy Capital Partners, one of the largest private owners of power generation and renewables in the U.S., to support AI infrastructure growth in the United States
- Blackstone’s A$24 billion acquisition, with CPP Investments, of AirTrunk, named the 2025 Digital Infrastructure Deal of the Year by TMT Finance APAC and marking Blackstone’s largest investment in the Asia Pacific region
- EQT Infrastructure III in the $950 million sale of its portfolio company Lumos to a joint venture of T-Mobile and EQT Infrastructure VI Fund, named TMT Finance’s 2025 Fiber Deal of the Year
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DigitalBridge in the $3.3 billion tower transaction between its portfolio company Vertical Bridge and Verizon, named TMT Finance’s 2025 Towers Deal of the Year and marking the largest U.S. towers transaction in about a decade
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DigitalBridge in a $9.2 billion equity investment in Vantage Data Centers, led by funds affiliated with the investment management platform of DigitalBridge and Silver Lake, named the 2025 TMT Finance Data Center Deal of the Year
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KKR and Singtel in the KKR-led consortium’s acquisition of the remaining 82% stake in ST Telemedia Global Data Centres at an enterprise value of S$13.8 billion, marking one of the largest digital infrastructure transactions ever in Southeast Asia
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Stonepeak Infrastructure Partners in the $3 billion recapitalization of Cologix and C$1.6 billion recapitalization of Xplore Inc., as well as in its acquisitions of Intrado Corporation’s safety business, Astound Broadband, DELTA Fiber (with EQT), Xplornet Communications and euNetworks
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Vantage Data Centers in its $15+ billion investment with OpenAI and Oracle to develop a data center campus in Port Washington, Wisconsin, which will feature four cutting-edge data centers providing around 1 GW of AI capacity, as part of OpenAI’s previously announced $500 billion Stargate initiative
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DigitalBridge in the formation of a joint venture with La Caisse (f/k/a CDPQ) for the joint $5.8 billion acquisition of Yondr Group, named the 2025 Digital Infrastructure Acquisition of the Year, Europe by IJGlobal Investor
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KKR in its agreement with Telefónica to establish Chile’s first open access wholesale fiber optics network
- Stonepeak in its $7.4 billion acquisition of Textainer Group Holdings, which was named the 2024 Transport Acquisition of the Year in North America by IJInvestor, and in the subsequent acquisition by an affiliate of Textainer of Global Sea Containers Limited (Seaco) for $1.75 billion
- Genesee & Wyoming (G&W) in its $8.4 billion sale to affiliates of Brookfield Infrastructure and GIC and in the majority investment by Grupo México Transportes in G&W’s CG Railway joint venture
- KKR in the acquisition of Dawsongroup plc, made as part of KKR’s Global Climate Strategy to support the electrification of Dawsongroup’s fleet, named the 2025 Value-Add Deal of the Year, Europe by IJGlobal Investor
- Wells Fargo in the sale of its $4.2 billion rail operating lease portfolio and its rail finance lease portfolio to a newly formed joint venture between GATX Corporation and Brookfield Infrastructure
- Intuitive Machines, a space exploration and infrastructure company, in its acquisition of Laneris Space Systems from Vantor Holdings Inc. for $800 million
- Sudamericana, Agencias Aéreas y Marítimas S.A. (SAAM) in the $1 billion sale of its shipping terminal and logistics businesses in South America, Central America and Florida to international shipping and container transportation company Hapag-Lloyd
- KSL Capital Partners, as part of the investment group led by L Catterton and with J. Safra Group, in the $800 million equity investment in Flexjet, marking the largest equity investment ever in private aviation
- Blackstone in the €21 billion recapitalization of Mileway, the largest private real estate transaction ever
- Corsair Infrastructure in the financial close of the $4.2 billion development project with Vantage Airport Group to build a new international Terminal 6 at JFK Airport in New York
- Stonepeak in its $5.7 billion acquisition of a 40% stake in Louisiana LNG Infrastructure LLC, a liquified natural gas export facility owned by Woodside Energy representing the largest project and foreign direct investment in Louisiana state history, named the 2025 Infrastructure Acquisition of the Year, North America, by IJGlobal Investor
- KKR in its acquisition, with Canada Pension Plan Investment Board, of a 45% equity interest in Sempra Infrastructure Partners, at an enterprise value of $31.7 billion; upon closing, a KKR-led consortium will become the majority owner of Sempra Infrastructure Partners
- Blackstone in its acquisition of a majority stake in Emerson's Climate Technologies business and transition of the business into a standalone company, Copeland, valued at $14 billion, and in its subsequent acquisition of full ownership in Copeland
- Johnson Controls International plc in its $8.1 billion sale of its Residential and Light Commercial HVAC business to the Bosch Group, marking the largest transaction in Bosch's history and named a 2024 M&A Deal of the Year by China Business Law Journal
- Vanguard Renewables in its joint venture with TotalEnergies to develop, build and operate Farm Powered® renewable natural gas projects in the United States
- KKR in its strategic partnership with HASI to invest in sustainable infrastructure projects across the United States, including additional joint capital commitments to the partnership, which now has nearly $5 billion in total investment capacity
- WhiteWater Midstream LLC in the formation of a joint venture with MPLX LP and ONEOK, Inc. to construct the Eiger Express Pipeline, through their existing joint venture with MPLX, ONEOK, and Enbridge Inc. for the Matterhorn Express Pipeline
- EQT and GIC on their joint acquisition of a majority stake in Calisen, named the 2025 EMEA Utilities Deal of the Year by IJGlobal Investor, and Calisen in its £337.4 million IPO
- Consortium of international investors, comprising Global Infrastructure Partners, Brookfield Asset Management, GIC, Ontario Teachers’ Pension Plan Board, NH Investment & Securities and Snam, in its investment in Abu Dhabi National Oil Company’s select gas pipeline assets valued at $20.7 billion, marking the largest-ever energy infrastructure investment in the region and among the largest global energy infrastructure transactions
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