California Code, Public Utilities Code - PUC § 8326

(a) Each electrical utility owning, in whole or in part, or operating a nuclear facility, located in California or elsewhere, shall provide a decommissioning cost estimate to the commission or the board for all nuclear facilities which shall include all of the following:

(b) The decommissioning costs estimate study shall be periodically revised in accordance with procedures adopted by the commission or the board pursuant to Section 8327.