The California Public Utilities Commission says Pacific Gas & Electric Co. must hand over all key safety records for its transmission lines or face potential fines and other penalties.
The Sept. 9 blast killed eight people and destroyed three dozen homes in San Bruno.
Regulators ordered PG&E to provide detailed safety and engineering records soon after the accident. Tuesday, PG&E provided summary documents, but acknowledged it was missing 8 percent of required safety records.
Among those missing were dozens of pressure tests, including for some sections of the line that blew up in San Bruno.