Pacific Gas and Electric is turning to Sempra Generation again for more solar power.

The California utility said Monday it had signed a deal to buy the electricity that will be produced from Sempra's planned 48-megawatt project called Copper Mountain Solar.

The project, which Sempra announced earlier this year and would use First Solar's thin-film panels, is scheduled to start construction by the end of the year and be completed in 2011, PG&E said.

Sempra now has managed to ink two solar power sales agreements with PG&E, which is buying power from a 10-megawatt plant that First Solar built for Sempra last year.

The 48-megawatt project would be built next to the 10-megawatt farm, First Solar said earlier this year. Both projects are located near Boulder City, Nev., next to Sempra's existing, 480-megawatt combined cycle natural gas power plant.

Sempra Generation is a subsidiary of San Diego-based Sempra Energy, which also owns the utility San Diego Gas & Electric in Southern California.

Sempra has ambitious plans to build a whole lot more solar power projects. In April this year, its CEO Michael Allman said the company has land to build at least 300 megawatts of solar farms in Arizona.