The San Diego County Water Authority is trying to become a player in the energy market. It’s not going very well.The agency’s biggest energy project is increasingly bogged down by a soaring price tag, relatively small returns and questions about whether it’s even needed. The project aims to address what’s become a major problem in the energy world: how to stop using fossil fuels without sacrificing reliability. Power generated from the sun, wind and water are better for the environment, but the sun doesn’t always shine, wind doesn’t always blow and hydroelectricity doesn’t work in a drought.