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Energy – Power and Renewables

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The power and renewable energy sector is a constantly evolving field with immeasurable future potential. With the world’s energy needs changing and possibilities in energy sources broadening, Simpson Thacher is a market leader in the industry, with cutting-edge knowledge and depth of experience that few firms can claim.

Top Rankings
Electricity (Transactional) - Chambers USA & Chambers Global (2011-2026)
Energy Transactions: Electric Power - The Legal 500 U.S. (2016-2025)
Energy: Renewable/Alternative Power - The Legal 500 U.S. (2013-2025)

Energy companies, their investors and lenders have repeatedly turned to us for advice on their essential legal challenges. Through changes in regulation and market conditions, we continue to assist our power and renewable energy clients across the full spectrum of their commercial needs, including in:

Power and Transmission
  • KKR in its $50 billion strategic partnership with Energy Capital Partners to accelerate development of data center and power generation and transmission infrastructure
  • BlackRock and Capital Power in their 50/50 partnership and joint acquisition of Harquahala Generation Company, LLC, named the 2024 North America Power & Transmission Deal of the Year by IJGlobal
  • I Squared Capital on its sale of Energia Group, one of Ireland’s largest energy utilities, to Ardian, in a transaction valuing Energia at more than €2.5 billion, marking ISQ’s largest-ever exit and representing Ardian’s first investment in Ireland
  • KKR and PSP Investments in their $2.82 billion acquisition of a 19.9% interest in American Electric Power’s Ohio and Indiana & Michigan transmission companies
  • EQT Infrastructure VI fund in its acquisition of Madison Energy Investments from affiliates of Stonepeak Partners LP
  • LS Power in its acquisition of the Rolling Hills natural gas-fired power plant from ArcLight Capital Partners
  • Macquarie Infrastructure and Real Assets in its investment in Puget Sound Energy, Inc., together with Ontario Teachers’ Pension Plan Board
  • PG&E’s emergence from its 18-month Chapter 11 bankruptcy 
  • Colbún in its $500 million 5.375% green notes offering, named Sustainable Corporate Bond Deal of the Year by Global Banking & Markets as part of its GBM Awards: Latin America & Caribbean 2026
  • Initial purchasers in VoltaGrid’s Rule 144A/Regulation S notes offering of $2 billion, and the lead arranger and administrative agent in VoltaGrid’s new $3 billion asset-based revolving credit facility, comprising VoltaGrid’s $5 billion comprehensive financing package
  • Multiple debt and equity offerings aggregating over $10 billion by PPL Corporation and its subsidiaries
  • General Electric’s $15 billion senior unsecured revolving credit facility
  • Multiple debt and equity offerings aggregating over $6 billion by American Electric Power
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    Renewable Energy
    • Morgan Stanley Infrastructure Partners in its strategic partnership with and investment in Torch Clean Energy
    • Stonepeak in its acquisition from Soleria of an interest in Generia Land, S.L., a land platform dedicated to renewables, marking the inaugural transaction in Stonepeak’s European renewable land aggregation platform, JouleTerra
    • Financing parties in approximately 100 financings valued at over $31 billion in connection with 37 gigawatts of renewable power assets for subsidiaries of NextEra Energy
    • Actis LLP in its strategic partnership with Mubadala Investment Company in connection with Mubadala’s circa €300 million commitment to Rezolv Energy, an independent renewable energy platform in Central and Eastern Europe
    • NextEra Energy in the formation of Nitro Renewables Holdings, a $1 billion joint venture with Blackstone to co-own and develop a portfolio of hybrid renewable energy projects
    • Celulosa Arauco y Constitución S.A., together with its subsidiary Arauco Celulose do Brasil S.A., in a landmark $2.2 billion financing used to finance the construction, development and operation of the Sucuriú Project in Brazil, which will include one of the world’s largest pulp mills and produce 400 MW of renewable energy, named the 2025 Development Finance Institution–Backed Deal of the Year by LatinFinance
    • KKR in the sale of a substantial minority stake in Viridor Group, the UK’s leading operator of Energy-from-Waste facilities, to Equitix, with a path for Equitix to acquire up to 50%
    • BlackRock’s Global Renewable Power Fund IV in its $500 million investment in Recurrent Energy, a solar and energy project storage developer
    • Affiliates of KKR in the mandatory tender offer over all shares corresponding to the share capital of Greenvolt, valued at $1.267 billion
    • Bridgepoint Group plc in its acquisition of Energy Capital Partners, the largest private owner of power generation and renewables in the United States and a leading investment firm across energy transition infrastructure
    • KKR in its strategic partnership with Hannon Armstrong Sustainable Infrastructure Capital, Inc. to establish CarbonCount Holdings 1 LLC ("CCH1") to provide long-term capital solutions for sustainable infrastructure projects across the United States, and in its additional combined investment of $1 billion, bringing the total investment capacity in CCH1 to nearly $5 billion
    • KKR in multiple investments in Serentica Renewables, awarded the 2023 Infrastructure Investor Energy Transition Deal of the Year for Asia-Pacific
    • Affiliates of KKR in their $2.2 billion acquisition of ContourGlobal
    • KKR in its sale of a 50% stake in global renewable developer, X-ELIO, to its joint venture partner, Brookfield Renewable, awarded the 2023 Infrastructure Investor Energy Transition Deal of the Year for Europe
    • Riverstone Credit Partners and Summit Partners Credit Advisors in the launch of R3 Renewables in a joint venture with Peabody, and the sale of their equity interests to RWE
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    “Simpson is always my first choice.”
    – Chambers USA (quoting a client)

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