[quote=skerzz]When you are under a net energy metering (“NEM”) agreement, SDGE will net your monthly over/under production on an annual basis and bill or refund on the net amount. ex. If I use 1,000kWh more than I produce Jan – May, and produce 900kWh more than I use June – December, I’ll pay SDGE for the 100kWh at the annual true-up period. I believe there’s a cap on the amount of systems that can be installed under the current NEM agreement, so these rules may be changing soon (my understanding is that the new NEM agreement will not be as favorable as the current NEM).[/quote]

best site for all of these answers is solarpaneltalk.com. Based upon a thread in that forum, the NEM will run out middle of 2016 at its current install rate. The rate you get at the end of a 12 month period is something like 35 cents so yes better than tier 1 but not enough to make up for oversizing considerably.