InnPower, legally named InnPower Corporation, is derived from the hydro system that served the Village of Cookstown since 1917. The Village of Cookstown amalgamated with the Township of Innisfil in 1991, and later that year Council passed a by-law which expanded the hydro service area of the Commission, named The Hydro-Electric Commission of the Corporation of the Town of Innisfil, to the new municipal boundries of the Town of Innisfil. On July 1, 1993 when the expansion became effective, the Commission increased its number of customers from approximately 560 to over 11,200. Effective November 1st, 2000, Innisfil Hydro became a corporation, with a Board of Directors responsible to the shareholder, the Town of Innisfil.