PG&E Corp. may black out a larger swath of its California service area during wildfire conditions as it tries to limit the risk of its equipment starting deadly blazes.

The state’s largest utility, which filed for bankruptcy last week amid escalating wildfire-liability costs it pegged at as much as $30 billion, disclosed the plans to potentially shut off power to more areas as part of a wildfire-mitigation plan it filed Wednesday with state regulators.