Simpson Thacher & Bartlett LLP today announced that Robert Warnement has joined the Firm’s Energy and Infrastructure Practice as a Partner in Washington, D.C., where he will focus on energy regulatory matters.
“Energy and power demand is surging and regulatory strategy is a key part of shaping successful deal outcomes,” said Eli Hunt, Co-Head of the Firm’s Energy and Infrastructure Practice. “Rob has spent decades successfully guiding clients through approvals and other regulatory matters on landmark energy transactions. Coupled with his deep knowledge of the nuclear power sector, his perspective will be invaluable as we help clients navigate an increasingly complex regulatory and transactional landscape.”
“We have built a world-class Energy and Infrastructure team and we are not slowing down,” said Breen Haire, Co-Head of the Firm’s Energy and Infrastructure Practice. “Rob’s arrival in Washington, D.C. comes as client demand is accelerating across every asset class, including nuclear and utilities. He follows the recent additions of Partner Erik Elsea and Counsel Paul Bolaji, and further builds out our platform in the nation’s capital where energy policy and dealmaking increasingly meet. We are thrilled to welcome him to Simpson Thacher.”
Rob’s practice spans energy regulatory, transactional and project finance matters, including securing approvals from the Federal Energy Regulatory Commission (FERC) and the Nuclear Regulatory Commission (NRC). He advises on mergers, acquisitions and restructurings; purchases and sales of generating facilities, including nuclear; auctions and spin-offs; joint ventures and joint ownership arrangements; power sales and hedging arrangements; and operating agreements. Before his legal career, Rob served as a U.S. Naval officer at the headquarters of the Naval Nuclear Propulsion Program, including as special assistant to the Deputy Director for congressional and public affairs, classification and technology policy and special projects.
“Simpson Thacher’s Energy and Infrastructure Practice leads the market’s most consequential transactions,” said Rob. “As regulatory guidance increasingly defines how energy projects get built and financed, I am excited to join this exceptional team and help clients move from strategy to execution.”
Simpson Thacher is a market leader in energy and infrastructure, ranked #1 on all energy and infrastructure transactions (Infralogic, Q2 2026), #1 on all digital infrastructure transactions globally and in North America (Infralogic, H1 2026), and #1 on all Power M&A in North America (Infralogic, 2025). The Firm’s global Energy and Infrastructure Practice has more than 150 dedicated lawyers across the U.S. and Europe offering unparalleled market coverage.
Rob’s arrival builds on the Firm’s work on transactions where regulatory strategy and dealmaking are deeply intertwined. Among other notable matters, the Firm recently advised on the $33.4 billion acquisition of AES, one of a series of recent representations by the Firm of investments in U.S. electric utilities; Crusoe in its strategic partnership with Aalo Atomics to develop the world’s first nuclear-powered AI data center at Idaho National Laboratory; Global Infrastructure Partners in its lead investment in, and financing of, the $5 billion Delfin LNG Project, the first floating LNG project in the U.S.; and Blackstone in the establishment of a unique compute financing platform to mobilize over $500 billion of capital to further accelerate the buildout of AI infrastructure.
The Firm has represented parties on all sides of historic and innovative energy and infrastructure transactions, supporting our clients throughout the lifecycle of their businesses—from formation and corporate structuring to project and asset development, financing and acquisition and exit.
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