Who whe are - List content

Independent and Transparent by Design

Unaffiliated with market interests, our mission is to serve the public
under the oversight of state, federal and reliability organizations


Federal Energy Regulatory Commission


North American Reliability Corporation


Northeast Power Coordinating Council


New York State Reliability Council


New York State Public Service Commission

Community Outreach - Basic Banner - 1.0.0

Community Outreach

The NYISO has hosted over 9,000+ visitors around the globe and our
employees have donated over $1.4M to local charities

Who We Are - charities

Who we are - Leadership team

Leadership Team

Board of Directors

Board of Directors

Robert Hiney
Vice Chairperson
Robert Hiney
Vice Chairperson

Robert Hiney joined the New York Independent System Operator (NYISO) Board of Directors in April 2006 and served as Chairman from April 2011 to April 2014. He had previously served as Vice Chair of the Board.


Mr. Hiney has a distinguished career in the electric industry, which includes 35 years with the New York Power Authority (NYPA). He is the former Executive Vice President for Power Generation for NYPA. Mr. Hiney began his NYPA service in 1970 as an assistant hydraulic engineer at the Power Authority’s Production Control Center, which was then located at the Niagara Power Project near Niagara Falls. Throughout his tenure, he assumed increasing responsibility and worked in the areas of power system operations, power supply planning, marketing, electric rates, research and development, and energy efficiency.


As Executive Vice President for Power Generation, Mr. Hiney oversaw all aspects of NYPA’s generating operations, including operation and maintenance, engineering, plant construction, fuel procurement, and the NYPA’s wholesale transactions with the New York Independent System Operator (NYISO). He formerly served as Vice Chairman of the Northeast Power Coordinating Council and as a trustee of the North American Electric Reliability Council. A native of Belmont, Massachusetts, Mr. Hiney received his Bachelor of Science in civil engineering from Tufts University and a Master of Science in civil engineering from the State University of New York at Buffalo. Mr. Hiney lives in Croton-on-Hudson, N.Y. and is a member of the American Society of Civil Engineers.

Michael Bemis
Michael Bemis

Michael Bemis of Madison, Mississippi, has more than three decades of experience as an executive in the electric utility industry. He began serving as a member of the Board of Directors of the New York Independent System Operator (NYISO) in April 2009. He became Board Chair in April 2014, after previously serving as Vice Chair. He served Exelon Corporation as President of Exelon Power and President of Energy Delivery, responsible for the company’s transmission, distribution, and customer service functions. Exelon distributes electricity and gas to approximately 5.4 million customers in Illinois and Pennsylvania.


Prior to joining Exelon, Mr. Bemis worked nearly two decades with Entergy Corporation in a number of executive positions including Executive Vice-President of International Operations and as Chief Executive Officer of London Electricity, with responsibility for Entergy’s International businesses in the United Kingdom, Australia, and Argentina. He also served as Entergy’s Executive Vice-President of Customer and Retail Service; as President and Chief Operating Officer for Mississippi Power & Light, Louisiana Power & Light, and New Orleans Public Service; and as Executive Vice-President and Chief Financial Officer for Arkansas Power & Light. Before entering the energy industry, Mr. Bemis was a partner with Deloitte, Haskin and Sells, where he was a designated firm specialist in the electric utility industry. He earned a Bachelor of Science in accounting from the University of Southern Mississippi and attended a number of executive development programs, including Harvard’s Advanced Management Program.

Roger B. Kelley
Roger B. Kelley

Mr. Kelley has over 40 years of experience in the electric generation and transmission business. From 2007 to 2008, Mr. Kelley served as President and Chief Executive Officer of the New York Power Authority, the largest state public power organization in the U.S. Most recently, he served as President and Chief Executive Officer of Peregrine Midstream Partners, LLC, a midstream gas storage entity in Houston, TX. From 2010 to 2013 Mr. Kelley was President and CEO of Midland Cogeneration Venture, a large co-generation project in Midland, MI.


From 2013 to 2014 Mr. Kelley was President and CEO of Fortistar Renewables, based in White Plains, NY, a developer and operator of renewable energy projects. Mr. Kelley, who graduated with honors and holds a Bachelor of Science degree in Electrical Engineering from Northeastern University, has significant experience in all areas of power generation, including nuclear, natural gas, coal, hydro, solar and landfill, as well as experience with electric transmission issues. He has served as a chief advisor on power issues to two of New York's governors, and as the chief technical member on the board of the New York State Energy Research and Development Authority.


Mr. Kelley has been employed by New York State Electric and Gas Corporation, Maine Public Service Company, Empire Energy Corporation, and LS Power Corporation. Mr. Kelley also served as a member of the Lt. Governor's Renewable Energy Task Force, which was responsible for the development and implementation of New York State's renewable energy portfolio. Mr. Kelley is a licensed professional engineer in New York State.

Teresa Marrinan
Teresa Marrinan

Ms. Marrinan has 35 years of energy experience ranging from her entry-level role as a utility Rate Analyst to a Senior Vice President responsible for commercial operations for a large US generation fleet. She has served as a senior commercial executive focused on strategic planning, portfolio risk management and commercial operations in wholesale and retail US electricity markets.

Ms. Marrinan was Senior Vice President, US SBU Commercial for The AES Corporation, where she was responsible for US commercial operations and portfolio strategies for fossil-fired, wind, solar and energy storage resources across the US, and management of the unregulated retail electricity marketing business. Ms. Marrinan also was an officer of the Dayton Power and Light Company, responsible for fuel procurement and power trading, 24-hour real-time generation dispatch, logistics management of physical commodities and the company’s participation in organized ISO/RTO markets. Most recently, Ms. Marrinan has served as Founding Partner of Hanover Strategy Advisors LLC, where she advises a variety of clients on energy strategy, financial, regulatory and market issues.

Ms. Marrinan serves on the Board of Trustees for Goodwill Easter Seals Miami Valley, and as an adjunct professor in Economics and Finance at The University of Dayton School of Business Administration. She previously served as Board Chair of Foodbank Inc. and Cox Arboretum Foundation, and as a Board Member of the Premier Health Plan. Ms. Marrinan holds an MBA from Xavier University and a BS in Business Administration from the University of Dayton.

Who we are - timeline

NYISO History

  • 1965


    Northeast blackout affects 30M people leading to creation of NY Power Pool

  • 1992


    Congress signs Energy Policy Act opening transmission lines to competition

  • 1999


    NYISO assumes control of NY's grid & electricity markets

  • 2000


    NYISO's markets encourage efficiency cutting costs by $6.4B over next 13 years

  • 2013


    NYISO breaks ground on new control center

  • 2017


    NYISO releases study that cites importance of carbon pricing in future grid