NYISO is a non-profit organization formed in 1998 as part of the restructuring of New York State's electric power industry. Its mission is to ensure the reliable, safe and efficient operation of the State's major transmission system and to administer an open, competitive and nondiscriminatory wholesale market for electricity in New York State. LIM's NYISO dataset begins on November 18, 1999 and is updated daily.

Visit the NYISO website at: www.nyiso.com.