I decided to look into this, because the data is often a bit off, but not by this much. It turns out there was an error in the calculations. For some providers, we extrapolate the values based on historical data, and in this case, it was being done incorrectly. The values have been updated here: https://findenergy.com/providers/pacific-gas-and-electric-co...

It looks a lot closer to the numbers you've been quoting now (hitting 31 cents / kilowatt hour in March). Thanks for catching that.