The contract amount has not been disclosed.

Under the extension, Fluor will continue to provide ongoing maintenance, modification and outage services for PG&E’s two nuclear generating units at Diablo Canyon, which produces 18,000 gigawatt-hours annually.

The work will include mechanical, electrical and civil tasks during non-outage and outage periods.

In May 2010, Fluor was awarded the initial O&M contract.

Fluor’s Power business senior vice president and head Matt McSorley said, "Fluor is pleased to extend our operations and maintenance services for PG&E."

"Diablo Canyon features an exemplary safety record while providing clean, reliable energy to millions of Californians. Fluor looks forward to continuing that tradition of safety excellence while maintaining this significant facility," McSorley added.

The Diablo Canyon Power Plant, which is operational since 1985, features two Pressurized Water Reactor units to produce energy for more than 3 million residents of Northern and Central California.