ENMAX CORPORATION

Direction and Leadership

ENMAX Corporate Governance

ENMAX Corporation's Board of Directors and executive team are committed to high standards of corporate governance. We are committed to providing leadership in the governance of our organization and believe sound corporate governance contributes to shareholder value, trust and confidence in ENMAX.

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Executive Team

Our Executive Team brings together a unique combination of experiences to deliver value to our shareholder, while helping to power your home, businesses and communities.

Meet our Executive Team

Mark Poweska

President & CEO

Mark is the President and CEO of ENMAX. He joined the organization in 2022 and oversees its regulated, competitive and energy retail businesses, ensuring the strategic direction enables reliable energy for customers now and in the future. He also serves as Board Chair of Versant Power, ENMAX’s Maine-based regulated transmission and distribution provider.

Sheri Primrose

Chief Financial Officer and Executive Vice President, ENMAX Energy

Sheri joined ENMAX in 2006, holding progressively senior roles in the organization. She has been Chief Financial Officer since 2023, and in January 2026, Sheri assumed the role of Executive Vice President of ENMAX Energy. She also serves on the Board of Versant Power, ENMAX's Maine-based regulated transmission and distribution provider.

Greg Retzer

Executive Vice President, ENMAX Power

Greg joined ENMAX in 2019 and has led ENMAX Power since 2024. He is responsible for ENMAX’s Alberta-based regulated transmission and distribution business, which owns, operates and maintains the system in and around Calgary and is regulated by the Alberta Utilities Commission.

Erica Young

Erica Young, President, Versant Power

Erica joined ENMAX in 2016 and, as of May 2026, is President of Versant Power, ENMAX's Maine-based regulated transmission and distribution business. She was previously Executive Vice President of ENMAX Energy, leading the organization's competitive energy businesses.

Brandie Yarish

Chief Human Resources Officer and Executive Vice President, Safety and Information Technology

Brandie leads ENMAX’s people strategies, organizational development, health, safety and environment programs and practices, as well as the IT team, and has been with the organization since 2018. She also serves on the Board of Versant Power, ENMAX's Maine-based regulated transmission and distribution provider.

Sarah Stevens

Senior Vice President, Regulatory and Chief Legal Officer

Sarah joined ENMAX in 2013 and has held progressively senior roles in the organization. In her current role since 2024, she leads the legal, regulatory, compliance and corporate secretary functions at ENMAX. Sarah also serves on the Board of Versant Power, ENMAX's Maine-based regulated transmission and distribution provider.

Marie Rajic

Senior Vice President, Corporate Affairs

Marie joined ENMAX in 2024 and leads the Public Policy and Government Relations, Shareholder Relations, Sustainability and Indigenous Relations, and Communications and Community Impact teams, focusing on shaping ENMAX's reputation and fostering relationships with government bodies, regulatory agencies and our Shareholder, The City of Calgary.

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Board of Directors

To contact our Board of Directors, please email boardofdirectors@enmax.com.

Meet our Board of Directors

Barbara Munroe

Barbara Munroe joined the ENMAX Board in 2021 and is the Chair of the Board. She previously served as the Vice Chair of the Board, and as Chair of the Corporate Governance Committee. She also serves as a Director of Whitecap Resources Inc. and is actively involved in volunteer and non-profit organizations. 

Mark Poweska

President & CEO

Nipa Chakravarti

Nipa Chakravarti joined the ENMAX Board in 2022 and has had an extensive career bringing innovation to teams including finance, commodity trading, operations, technology and procurement. She also serves as Vice President, Digital Transformation and Technology and Chief Transformation Officer at the University of Calgary, and on the Board of the Prostate Cancer Centre, where she is the Chair of its Audit Committee.

Laura Formusa

Laura Formusa joined the ENMAX Board in 2017 and is the Chair of the Human Resources Committee. She also serves as Board Chair of Tantalus Systems Holding Inc. and as a Director of 407 International Inc. Laura has also served on the Board of Governors of York University, and as Chair of the Corporate Governance and Nominating Committee of Equitable Life Insurance Company of Canada.

Eric Markell

Eric Markell joined the ENMAX Board in 2016 and is the Chair of the Audit Committee. Eric has over 35 years of experience in the utility and power industry which includes experience in corporate finance, accounting, regulatory relations and rate-making, asset acquisition, generation operation and construction, project finance and project development.

Byron Neiles

Byron Neiles joined the ENMAX Board in 2022 and has over 30 years of experience in the energy industry. In 2024, he retired as the Executive Vice President & Chief Administrative Officer at Enbridge Inc. in Calgary, where he led the IT, human resources, real estate, supply chain management, public affairs, communications and sustainability teams. Byron also serves on the Board of Directors for Calgary Economic Development, and the University of Calgary Board of Governors.

Dr. Chika Onwuekwe K.C.

Dr. Chika Onwuekwe joined the ENMAX Board in 2021 and is Chair of the Safety, Environment and Sustainability Committee. Chika has over 20 years of legal and executive experience. He is also the Vice President, Legal, General Counsel and Corporate Secretary of Trican Well Service Ltd. and serves as a Director for each of Kadibia Inc., the Association of Corporate Counsel, Alberta Chapter, and the Canadian Public Accountability Board.

Elise Rees

Elise Rees joined the ENMAX Board in 2016. She is also a Director and Audit Committee Chair of Artemis Gold Inc. and K-Bro Linen Systems Inc., and previous Audit Committee Chair of Great Panther Mining Limited. Elise has over 35 years of experience in public accounting. She spent 18 years as a partner with Ernst & Young, LLP and 14 of those years focused on acquisitions, mergers and corporate restructuring. Elise has also been the global client-coordinating partner for services to the BC Credit Union Industry.

Charles Ruigrok

Charles Ruigrok joined the ENMAX Board in 2010 and previously served as Chair of the Board, as Chair of ENMAX’s Audit Committee, and as Board Chair of Versant Power, ENMAX’s Maine-based transmission and distribution business. Mr. Ruigrok also served as ENMAX’s President & CEO, on an interim basis, between 2011-2012 and 2021-2022.

Sonya Savage, K.C.

Hon. Sonya Savage joined the ENMAX Board in 2026 and has over 30 years of legal, regulatory, political and electricity sector expertise. She also serves as Senior Counsel with Borden Ladner Gervais, and in other board and advisory roles including for Critical Minerals Americas Inc., E3 Lithium Ltd., Wilder Institute Calgary Zoo, and Reconciliation Energy Transition Inc.

William Taylor

William (Bill) Taylor joined the ENMAX Board in 2020 and is the Chair of the Corporate Governance Committee. He has over 30 years of experience in the energy sector. Before joining ENMAX, Bill spent 21 years at TransCanada Corporation (now TC Energy) where he held various senior executive positions.

Bruce Williamson

Bruce Williamson joined the ENMAX Board in 2020 and has over 30 years of experience in the energy sector. Before joining ENMAX, Bruce held many senior executive positions including: President & CEO and Board Chair of Southcross Energy Partners; President & CEO and Board Chair of Cleco Corporation; President and CEO and Board Chair of Dynegy Corporation; President & CEO of Duke Energy Global Markets.

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Our Shareholder Relationship

ENMAX is a private corporation incorporated under the Alberta Business Corporations Act whose sole shareholder is The City of Calgary. Calgary’s City Council acts in the capacity of the Shareholder on behalf of Calgarians.

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Our Plan of Compliance

The Code of Conduct Regulation must be followed by all owners of electricity distribution systems, their affiliated retailers and their regulated rate providers in Alberta.

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