Ensure power system
reliability and competitive
markets for NY in a clean
energy future


 Working together with
stakeholders to build the
cleanest, most reliable
electric system in the nation
Core Values

Core Values

 Our People
Customer Focus 

Our Powerful Purpose

We are dedicated to planning a reliable grid of the future, leveraging open and fair electricity markets, and informing policymakers and stakeholders.

Wired to Serve

Running New York’s grid is a big responsibility. So is caring for our communities. The health, welfare, and livelihood of the communities we serve depends on it. Learn more about our Corporate Social Responsibility.

Frequently Asked Questions

Learn more about the NYISO and our role in delivering the grid of the future.

Leadership Team Personnel Cards

Leadership Team

Board of Directors

Board of Directors

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 serves 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.

Learn More

Information for

 The key issues
grid reliability

Our Team

 Join the people
who power
New York