The San Diego County Water Authority wants to find somebody to develop an energy storage facility at the San Vicente Reservoir, nestled among the Cuyamaca Mountains near Lakeside. And officials are not only confident they can find a number of potential candidates willing to fully develop the project, they expect to entertain proposals in the range of $1.5 billion to $2 billion. “That’s depending on the size of this facility and the configuration,” said Kelly Rodgers, the energy program manager for the Water Authority, which is working in partnership with the City of San Diego on the project.