Blake, Cassels & Graydon LLP

National powerhouse Blake, Cassels & Graydon LLP fields a full-service oil and gas offering in its Calgary office. Widely acknowledged as a leader in oil and gas transactions, including M&A, joint ventures, share purchase and sale agreements and project development, the well-balanced group also excels in complex regulatory matters. Among its recent highlights in the commercial sphere, high-profile energy specialist Ben Rogers is acting alongside department co-head Christine Milliken to advise TC Energy Corporation on all corporate and commercial matters related to the C$20bn Coastal GasLink Pipeline. Other key transactional partners include fellow-practice co-lead Keith Byblow; Chris Harris, who led on two billion-dollar energy deals during 2024/25; and rising associate Ashton Menuz. On the regulatory side, practice co-head Terri-Lee Oleniuk successfully represented Pembina Pipeline Corporation before the British Columbia Utilities Commission in a claim filed by Tidewater Midstream and Infrastructure regarding the Western Pipeline System. Other key regulatory contacts include Lars Olthafer, who specializes in advising upstream oil and gas producers as well as pipeline and electrical transmission companies on regulatory and environmental issues; and Katie Slipp, who is recommended for regulatory proceedings and corporate support work.