Utilities put most of their revenue back into costs and I'm not interested in the relative profitability, so I really do mean revenue. I'm assuming that users c

Utilities put most of their revenue back into costs and I'm not interested in the relative profitability, so I really do mean revenue. I'm assuming that users correlate to revenue, and the primary cost driver is service area, which means the efficiency is the ratio between area and revenue. I'm also making the simplifying assumption that the major utilities service their entire states and that the area being discussed is large / demographically similar enough that a lot of the other differences average out. These aren't true (e.g. PG&E only services part of California), but I'm hoping it's sufficient for a sanity check. The ratio of revenue to area served here is radically different though and the other states are significantly better. We can make a prediction to double check this that people in those states pay lower rates on average, which is also true. If you want to go and add up the customers directly, PG&E serves 5.5M. The others serve around 8.3M people collectively from some quick searches. I don't have info on actual service area, nor do I really want to spend months writing an industry report on it.