AIUI This relationship between PG&E and SF/CPUC has a corrupt history dating back to the 90s with Willie Brown and later even Kamala Harris.

It's a part of why Republicans actually have some grounds for calling Harris corrupt - Willie Brown's office when mayor of SF was notorious for being a pay-to-play situation, she worked there (and even dated him).

  > Or, as Supervisor Aaron Peskin described it, “mind-boggling.” He said
  > the “city family” that grew up under Mayor Willie Brown, continued
  > working under Mayor Gavin Newsom, flourished under Mayor Ed Lee and
  > stayed on under Breed “were all doing favors for one another and
  > living in their own little bubble.”
  >
  > “They all convinced each other that they were like a family, and
  > family can give gifts to their children,” Peskin said, noting those
  > same family members took the city’s required annual ethics training
  > like everybody else and must have known what they were doing was
  > wrong.
  >
  > “They just got too cozy over too much time, and they lost their way,”
  > Peskin said. “Now I have to look at everybody going, ‘Are you a
  > crook?’ It’s not the way I want to see the world.”

It's trivial to find articles about the conflicts of interests between Brown and PG&E, I think even to this day he still represents their interests.