San Francisco-based Cleantech America started construction on Aug. 24 on what will be California’s largest solar photovoltaic farm, in Mendota. Quanta Service Inc., Houston, will provide engineering, procurement and construction services for the 5-MW solar farm that will cover about 50 acres. A spokesman for Cleantech, which is owned by New Zealand’s largest renewable electricity generator, Meridan Energy, would not reveal a cost for the project, only saying that it is a multimillion dollar project. The project is the first using solar photovoltaic technology to be approved under the state’s renewable portfolio standard. The farm is expected to be operational by the end of the year. Power will be sold to Pacific Gas & Electric, San Francisco.