Why is it "people are willing to pay" and not "corporations are brazen enough to charge"? These utilities are necessities and relatively few people have access to cheaper alternatives to them.
Because, under usual circumstances, self-interested corporations compete against each other to get as close to what people are willing to pay for energy as possible.
Because PG&E is a for-profit company. They are supposed to charge what the market will bear.
The regulations mandate that the market operates that way. It's the government that should be held to account.