California Code, Public Utilities Code - PUC § 776.5

(a) In preparation for receiving notifications regarding the deenergization of electrical lines pursuant to Section 8386 or 8387, a facilities-based mobile telephony services provider shall do all of the following:

(b) Upon receipt of a notification regarding the deenergization of electrical lines pursuant to Section 8386 or 8387, a facilities-based mobile telephony services provider shall communicate relevant situational information relative to communications capabilities during the projected outage to electrical corporations, local publicly owned electric utilities, electrical cooperatives, and appropriate public safety stakeholders, including, but not limited to, public safety offices and emergency response offices, for the affected area.