They were supposed to be designed to prevent devastating wildfires.
Regulators announced $12 million in fines against PG&E, $10 million against Southern California Edison, and $24,000 against San Diego Gas & Electric.
All three companies were criticized for their handling of public safety power shutoffs in October 2019.
Regulators blasted PG&E for a botched shutoff that left nearly 2 million people in the San Francisco Bay Area and Northern California without power.
Last year, the Public Utilities Commission penalized PG&E $106 million for violating guidelines during fall 2019 power shutoffs.