They do and how they do the price tranches has changed a lot in the last 5 years. It used to be 4 tranches, 10, 20, 30 and 40. It was very hard to get into the 20 tranch for a single home (maybe if you were bitcoin mining or something). Now the tranches are multiple times higher and its easier to get into the higher tranches. Look on PG&E's website for the specifics.