Your meter has a sort of odometer for your kWh used. What you could do is just write that down every day at the same time, say 9AM or 9PM if you’re not a morning person. After 7 days you should have a pretty good approximation of your daily average. Take that average x 30, is that closer to 500 kWh or closer to what SDGE is billing you?
They get profit sharing checks. Those profit checks go down when the company is less profitable. Those profit checks go to $0 and their paychecks go to $0 when the company is losing money and has to let people go.