Our executive team
Learn about the men and women who make up Ontario Power Generation’s Executive Team, and who provide the expertise and experience that powers Ontario.
Meet the members of Ontario Power Generation’s Executive Team, who help guide us in keeping OPG a clean energy leader.
Ken Hartwick, President and Chief Executive Officer
Ken Hartwick is Ontario Power Generation’s President and CEO. Ken joined OPG in March 2016 as OPG’s Chief Financial Officer and Senior Vice President - Finance, where he led all operations under Finance, Business Development, Strategy, and Risk. As CFO and SVP - Finance, Ken also led the launch of Canada’s first utility green bond as well as OPG’s expansion to the U.S. through the acquisition of Eagle Creek Renewable Energy LLC.
Ken joined OPG from Wellspring Financial Corporation, where he was CFO and Treasurer. He was also interim President and CEO at Atlantic Power Corporation, a generating company that does business in Canada and the U.S. For ten years prior, Ken was the President and CEO of Just Energy Corporation, a Canadian-based energy retailer. In addition, he held the position of CFO at Hydro One between 2001 and 2004. He also held senior positions at Cap Gemini and was a partner at the accounting firm Ernst and Young.
Ken is a Chartered Professional Accountant with an Honours Bachelor of Business Administration. He serves on a number of boards.
Originally from Norwood, Ontario (near Peterborough), Ken now lives in Milton with his wife and has three grown children.
Mike Martelli, B.A.Sc., P. Eng., ICD.D President, Renewable Generation
Mike Martelli is President of Renewable Generation at OPG. Mike was appointed to his current position in July 2013 and is responsible for leading a team of 1,500 skilled and dedicated team members who operate and maintain OPG’s two operating thermal stations, 66 hydroelectric generating stations and a solar project. These stations are located across Ontario and have total capacity of over 10,000 megawatts (MW).
Mike is a member of OPG’s Enterprise Leadership Team and an officer of the company. He has directed major projects including the Lower Mattagami, New Post Creek and Ranney Falls hydroelectric projects; fuel conversions of Atikokan Generating Station and Thunder Bay Generating Station from coal to biomass; and the Nanticoke Solar Project. Mike is also responsible for Corporate Indigenous Relations, working to build and maintain positive relationships with Indigenous communities throughout Ontario.
Mike manages OPG’s commercial partnerships with First Nation communities including Lac Seul First Nation, Moose Cree First Nation, Taykwa Tagamou Nation, Six Nations of the Grand River and Mississaugas of New Credit First Nation. These partnerships, which often involve joint ownership by both OPG and the First Nation communities, demonstrate a successful business model that generates economic growth and development for local communities while providing clean, renewable electricity for Ontario. Mike also serves on the boards of Portland Energy Centre; a joint venture between OPG and TransCanada that owns and operates a 550 MW combined cycle gas turbine generating station, and Brighton Beach Power; a joint venture between OPG and ATCO that owns and operates a 550 MW combined cycle gas turbine.
Mike joined OPG’s predecessor company, Ontario Hydro, in 1985. Since then he has held roles of increasing responsibility in both technical functions and plant operations at OPG site locations across Ontario including Timmins, Renfrew, Thunder Bay, Niagara Falls and Toronto. Mike’s previous management and executive roles include Maintenance Manager, Asset Manager, Director of Engineering, VP Operations-Thunder Bay, VP Operations-Niagara and SVP-Hydro-Thermal Operations.
A graduate of the University of Waterloo, Mike holds a B.A.Sc. in Mechanical Engineering. He is a Professional Engineer in Ontario and a graduate from the Institute of Corporate Directors. He is also a director on the board of the Canadian Hydropower Association.
Dominique Miniere, President, Nuclear
Dominique Minière recently joined OPG as President, Nuclear. His primary focus is growing OPG's nuclear business along with oversight of all of OPG's nuclear operations. He is a seasoned leader with a wealth of experience.
Prior to his appointment at OPG, Dominique was Chief Operating Officer of Electricitè de France (EDF), one of the world's largest nuclear and thermal fleets. With nearly 40 years of experience with EDF, Dominique has substantial experience constructing, operating and refurbishing nuclear plants and has been directly engaged in spent fuel management and nuclear waste.
He also has extensive international experience, having served on the board of the World Association of Nuclear Operators.
Sean Granville, Chief Nuclear Officer
Sean Granville is Chief Nuclear Officer (CNO) at OPG. Sean was appointed to this position on May 1, 2018, after two and a half years as Deputy CNO. Prior to this, Sean spent three years at Point Lepreau Nuclear Generating Station in New Brunswick as the Site Vice President and CNO. During his tenure with NB Power, the station achieved improvement as measured by the World Association of Nuclear Operators (WANO) Peer Review.
Sean's extensive background includes a 35-year career with OPG (and the former Ontario Hydro) holding positions such as Deputy Vice President, Director of Operations and Maintenance, and Director of Nuclear Programs. He was certified as a Licenced Shift Manager and has held Duty Manager positions at both Darlington and Pickering stations. Sean has expertise in areas such as operational leadership, leader development, performance improvement, organizational effectiveness, and industry engagement.
Sean’s nuclear industry experience also includes a secondment to WANO, serving on the Board of Directors of the Canadian Nuclear Association, and as a voting member of the Candu Owners Group.
Sean is a graduate of the University of Waterloo with a B.A.Sc. in Mechanical Engineering.
Christopher F. Ginther, Chief Administrative Officer
Chris Ginther is Chief Administrative Officer at OPG. He joined the company in July 2012 as SVP and General Counsel and was appointed to his current position in February 2017.
Chris is responsible for the Regulatory, Procurement, Legal, Environmental, Real Estate and Facilities portfolios. Chris is a member of the OPG Enterprise Leadership Team and other committees.
Chris received his Bachelor of Arts Degree from the University of Western Ontario in 1983 and graduated from Osgoode Hall Law School in 1986. He received his Master of Laws Degree from Osgoode Hall in 1999.
Chris began his legal career at Torys LLP in Toronto. He has served as Vice-President and General Counsel at BCE/Bell and Chief Legal Officer at Ontario Lottery and Gaming Corporation.
Barb Keenan, Senior Vice President, People and Culture, and Chief Ethics Officer
Barb Keenan is Senior Vice President, People and Culture, and Chief Ethics Officer at OPG. She was appointed to her current position in March 2010. Barb is responsible for the development of human resource strategies that support OPG’s business goals, including enhanced employee engagement, employer of choice through recruiting, succession planning and building successful relationships with OPG’s unions and partners. She is also responsible for strategies and programs supporting safety and employee wellness.
Barb joined Ontario Hydro, the predecessor company of OPG, in 1989 and has held various roles in Human Resources. Prior to her current appointment, Barb held the position of Vice President - Nuclear Human Resources and Employee Safety, and Vice President - Corporate Human Resources and Employee Safety. In these roles, Barb has been accountable for the overall management, leadership, direction and support for providing products and services designed to enhance business performance in the areas of leadership development, workforce and succession planning, recruitment, change management, employee communications and nuclear and corporate security. From 2000 – 2006, Barb worked with Capgemini Canada as Vice President – Human Resources for Outsourcing and later the broader organization.
Barb is an Honours Arts graduate from the University of Toronto, a Certified HR Planning Professional and a Certified Human Resources and Compensation Committee Director.
John Mauti, CPA Acting Chief Financial Officer
John is a CPA (CA) with over 27 years of service to OPG in a variety of areas. In his most recent role as Chief Controller and Accounting Officer, John oversaw a dedicated team of professionals that ensured business plans, external regulatory filings, tax matters and client-oriented controllership support were being delivered effectively across OPG. John has appeared before the Ontario Energy Board on numerous occasions and has represented OPG with the Canadian Nuclear Safety Commission and internationally on various nuclear decommissioning and waste management issues.
John is a trusted member of our management team and brings a wealth of company experience and knowledge that he has grained supporting the various business operations of OPG over many years.
He is a graduate from Wilfrid Laurier University’s school of business and is a devoted husband and father of three.
Dietmar Reiner, B.A.Sc., P.Eng. Senior Vice President, Enterprise Projects
Dietmar Reiner is Senior Vice President, of the Enterprise Projects Office, which is responsible for the planning and execution of large and complex strategic projects such as the Darlington Refurbishment, the Nuclear Decommissioning Program and Pickering Safe Storage.
Formerly the SVP of Nuclear Projects, Dietmar was responsible for the vision, strategy, and leadership for planning and executing the mid-life refurbishment of the Darlington Nuclear Generating Station. He also served as SVP, Nuclear Refurbishment.
Dietmar joined Ontario Hydro (OPG’s predecessor company) as an engineer in 1985 and proceeded to hold progressively senior positions in nuclear, hydroelectric and power systems.
In 1998, he served as a member on the technical panel of the Province’s electricity market design committee, where he led the design of the wholesale market rules and guidelines, which launched Ontario’s open electricity market.
In 1999, Dietmar was appointed to the position of Vice President, Commercial Systems where he was responsible for establishing the commercial infrastructure that enabled OPG to successfully compete in deregulated electricity markets. He also oversaw OPG’s preparations for the opening of Ontario’s electricity market.
In 2000, Dietmar was appointed to the position of Chief Information Officer, and led the transition of OPG’s internal information systems group to an outsourced services partnership.
In 2008, he was appointed to the position of Senior Vice President, Inspection, Maintenance & Commercial Services where he was responsible for providing specialized inspection and maintenance services to support the safe and reliable operation of OPG’s and Bruce Power’s nuclear generating fleets, as well as the management of OPG’s heavy water services and isotope sales businesses.
Dietmar has a Bachelor of Applied Science Degree in Honours Electrical Engineering from the University of Waterloo.
Jennifer Rowe, Senior Vice President, Corporate Affairs
Jennifer Rowe is Senior Vice President, Corporate Affairs at OPG. She was appointed to the role in January 2017.
Jennifer is responsible for building and managing relationships with OPG’s stakeholders, including senior officials and government stakeholders, industries, communities and the OPG Board. Her responsibilities also include developing corporate communications strategies that support OPG’s business goals.
Prior to joining OPG, Jennifer held numerous marketing, communications and corporate affairs positions in the financial services industry. Most recently, she was the Senior Vice President and Chief Marketing Officer at Meridian Credit Union. Previously, she served as Senior Managing Director, Marketing and Communications as well as VP Corporate Affairs at Manulife.
Jennifer has a Bachelor of Commerce degree from McMaster University and serves on the McMaster Governors and Alumni Association Board.