The residential and commercial solar markets are smoking hot in California this Spring. As you may know, State incentives decline whenever sales of solar PV systems reach certain trigger points. There are separate incentive programs for residential and non-residential systems purchased in each of the state's 3 investor-owned utility territories: PG&E, SDG&E and SCE.
Between March 26 and April 26 all six of these programs reached the end of an incentive step and lowered their rebates. This was caused by a huge surge of demand, most of which occurred the six weeks after Valentine's Day. The solar market usually pauses to catch its breath after rebate drops, but it also traditionally has its strongest selling season from June to August. I predict that the strength we've seen recently will continue and that at least 4 of the 6 programs will record another rebate drop by the end of 2010.
You can keep track of California rebate levels and reservation levels here: http://www.csi-trigger.com/