take a look at this great excel app
http://www.keepandshare.com/doc/804727/pgerates2-1-xls-september-16-2008-5-15-am-357k?dn=y
It will help you simulate you energy bill using EV and/or PV with E1 , E6 and E9 rates.
In my case , with a 5.0kw system, It will cost less with E9 than E6.
Two...