LAWYER PROFILE
Deirdre Sheehan

Deirdre Sheehan

Canada 2026

Chambers ranking badge
Chambers ranking badge

Ranked in 1 practice area

Energy: Power (Regulatory)

Nationwide - Canada

4 years ranked

About

Provided by Osler, Hoskin & Harcourt LLP

Canada

Practice Areas

Deirdre is Co-Chair of Osler's Regulatory, Indigenous and Environmental practice. Deirdre practices energy regulatory, Indigenous and environmental law and advises clients on the regulatory and environmental aspects of power, electricity, oil and gas and other energy developments, including regulatory proceedings for setting rates and tariffs. She advises on power transmission, distribution and generation projects in Alberta and regularly appears on behalf of clients before the Alberta Utilities Commission. Deirdre also has experience with matters before the Alberta Energy Regulator, the Canada Energy Regulator and other regulatory agencies and tribunals, including Alberta Environment and Protected Areas, the Alberta Environmental Appeals Board, the British Columbia Utilities Commission and the Yukon Utilities Board.

Deirdre has advised on power transmission lines, renewable and other power generation, oil and gas wells, pipelines, oil sands developments, upgraders, gas storage, and waste disposal facilities. She also has widespread experience in environmental impact assessments required under provincial and federal laws.

Deirdre's Indigenous law practice focuses on consultation, accommodation and participation of Indigenous groups in relation to large energy projects.

Deirdre also teaches Administrative Law at the University of Calgary.

Prior to joining Osler, Deirdre was a partner at another leading national law firm.

Career

University of Victoria, LLB, 2001

University of Alberta, BEd, 1996

Bar Admission: Alberta, 2002

Professional Memberships

Law Society of Alberta

Canadian Bar Association (Administrative Law, Alberta South, Executive Member)

Chambers Review

Provided by Chambers

Chambers Canada Guide

Energy: Power (Regulatory) - Nationwide - Canada

Band 4
Band 4

Individual Editorial

Deirdre Sheehan's regulatory expertise spans both the power and renewable sectors, frequently representing her clients before the Alberta Utilities Commission.

Strengths

Provided by Chambers

  • Deirdre is an incredible asset.

    Energy: Power (Regulatory)Chambers Canada Guide
  • Deirdre is always very well considered in the advice she provides. She cuts through complexity to deal with the heart of a matter.

    Energy: Power (Regulatory)Chambers Canada Guide

Ranked Individuals at Osler, Hoskin & Harcourt LLP (199)

Alberta

British Columbia

Nationwide - Canada

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