Green Ambassadors: United States 2025

Carl Fleming


McDermott Will & Emery LLP

Carl Fleming

At McDermott Will & Emery LLP, renewable energy and private equity lawyer Carl Fleming has built a reputation for his ESG expertise. He is known for his work on significant energy transition deals, including the world’s first zinc battery financing for Pine Gate Renewables, the first hydrogen fuel transaction for hydrogen-powered trucks with Bayotech, and the first renewable natural gas debt financing in the US.

Fleming’s influence extends beyond legal practice into advisory roles at the highest levels of government. Appointed by the Obama, Trump, and Biden administrations to the Renewable Energy and Energy Efficiency Advisory Committee (REEEAC), he advises the Secretary of Commerce on wind, solar, battery storage, and electric vehicles. He also chaired the White House’s first hydrogen roundtable, contributing to the US hydrogen roadmap and participating in the US-Germany hydrogen consortium.

Fleming is a prominent thought leader, regularly speaking on renewable energy and ESG, lecturing at multiple universities, and publishing and contributing to books. His insights are featured not only in the firm’s own legal updates, but also in major media outlets, including Reuters and Forbes.