Seán C. O’Neill

Partner at McCarthy Tétrault LLP

Industry Group Leader – National Power Group | Toronto Office

Seán C. O’Neill is a highly respected lawyer and Partner at McCarthy Tétrault LLP, where he leads the firm’s National Power Group. With over two decades of experience since his Ontario call to the Bar in 1997, Seán delivers exceptional legal counsel to domestic and international acquirers, investors, and sellers of an extensive range of power assets. His expertise spans transmission and distribution, district energy, and all major generation technologies—including nuclear, conventional, and alternative energy.

Seán frequently assists financial institutions and borrowers in structuring and executing project financings and re-financings for power projects and distribution systems across Canada and the United States. His comprehensive sector knowledge extends to representing project developers and sponsors in the negotiation of pivotal commercial arrangements, such as power purchase agreements, energy service agreements, contracts for difference (CFDs), service contracts, conservation and demand management agreements, and joint-venture agreements.

Recognized for his strategic insight and deep understanding of the power sector, Seán O’Neill is a valuable advisor to clients seeking to navigate complex energy projects, investments, and regulatory challenges. Backed by the experience of McCarthy Tétrault’s multidisciplinary team, he delivers results-oriented legal solutions that support the evolving needs of the Canadian and North American energy landscape.

Year Called to Bar: 1997 (Ontario)
Phone: (416) 601-7699
Fax: (416) 868-0673
Email: [email protected]

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