Regulators and plant owners say the reactors won't be restarted until all safety issues are addressed. Costs continue to mount and scrutiny has intensified.
The state Public Utilities Commission plans to vote on an order next month requiring plant owners to disclose the potential economic hit for ratepayers, ranging from a relatively quick restart to a permanent shutdown of the twin reactors.
About 7.4 million Californians live within 50 miles of San Onofre, which can power 1.4 million homes.
The plant is owned by SCE, San Diego Gas & Electric and the city of Riverside. The Unit 1 reactor operated from 1968 to 1992, when it was shut down and dismantled.