Plans are in the works for an energy storage facility at the San Vicente Reservoir in San Diego’s East County that could ease pressure on electric grids by producing locally generated renewable energy, according to the San Diego County Water Authority. The San Diego County Water Authority Board of Directors on Thursday authorized the Water Authority, in conjunction with the City of San Diego, to begin seeking detailed proposals for the project that also would lessen upward pressure on water rates by providing a new source of revenue, officials said.