The San Diego County Water Authority, in conjunction with the City of San Diego, is seeking proposals for a 500 MW pumped hydro power station.The water authority plans to issue a request for proposals this summer to solicit more detailed proposals from 18 respondents to an earlier request, but is also open proposals from parties that have not yet submitted proposals. The project would involve a 500 MW pumped storage facility at the San Vicente Reservoir that would be capable of storing energy for five to eight hours.