I've been on E-9A with solar for almost a year. E-9A is a great rate, because summer peak rates are very high and that is when your system is producing the most kWh. You are credited for production at the retail rate. You are billed each month for the unbundled distribution costs, which comes to about $12. You also receive a NEMS [net energy metering system] statement each month. The statement gets "trued up" at the end of 12 months. If you have a credit, PG&E will not necessarily pay you anything. The most you will get is a payment at its wholesale rate for producing more than you consume. The term is NSC [net surplus compensation]. In my case, I'll have a credit, even though I will have consumed more kWh than I produced. That's because I produced so much at summer peak rates, and consumed so much at off-peak rates. The net metering system is explained quite well at:http://www.pge.com/myhome/saveenergymoney/solarenergy/nembilling/
PG&E is going to institute its new EV rate within the next few months. Existing E-9 customers will be grandfathered in, at least until the end of 2014. The new rate may be more advantageous than E-9A if you have solar, because there will be winter peak rate periods and the rate will be even higher. The incentives change radically when you have solar.