New York ISO (NYISO)

The New York Independent System Operator, commonly called NYISO, is the organization responsible for managing New York’s electric grid and its competitive wholesale electric marketplace. The NYISO was formed in 1999 evolving from the prior New York Power Pool (NYPP). After the Northeast Blackout of 1965, New York’s seven investor-owned utility companies established the New York Power Pool (NYPP) to coordinate the reliable operation of their respective systems, which was later joined by the New York Power Authority. The NYPP was responsible for balancing electricity supply and demand, maintaining transmission voltage, monitoring system contingencies, managing operating reserves, and dispatching generation. 

In 1997, the NYPP filed a proposal with FERC to form an independent system operator (NYISO). The new NYISO would continue to perform the operational functions of the former NYPP plus the added function of administering New York’s wholesale electricity marketplace. NYISO also took on the function of transmission planning.