Millstone is a nuclear power plant located in Waterford, Connecticut, within the Northeast Power Coordinating Council region. With an impressive operating capacity of 2121.1 MW, it plays a significant role in the energy landscape of ISO New England. The plant is operated by Dominion Nuclear Connecticut and is unregulated, with Dominion Generation as its majority owner under the holding company Dominion Energy. The primary fuel source for Millstone is nuclear energy, and its power is primarily purchased by The United Illuminating Company.