LOS ANGELES (AP) — One of California’s largest utilities has agreed to pay a $24.5 million penalty for safety violations uncovered after a 2011 windstorm left more than 400,000 customers without lights and a power-line failure electrocuted three family members, state regulators announced Thursday.

The proposed decisions by the California Public Utilities Commission staff said Southern California Edison also violated rules by failing to preserve evidence needed to investigate power-pole collapses that occurred during the storm.