Rancho Seco Nuclear Power Plant, California

The Rancho Seco Nuclear Power Plant, near Sacramento, is one of three large-scale nuclear power plants in California, and was the first to close. It operated only for only 14 years (from 1975 to 1989), and was officially permanently decommissioned by public vote in 1997. Many of its structures remain on site, including the structure that housed the 913MW reactor, and the two 500 foot tall cooling towers. The spent fuel assemblies as have been placed in dry storage in the plant's on-site Independent Spent Fuel Storage Installation (ISFSI). Overall the remediation effort has cost more than $500 million. A 500MW natural gas power plant has been built on site, and a  public park nearby features a 160-acre lake which was originally intended as a source of emergency cooling water for the reactor.