The thing is it does work but is costly & takes forever to recoup your investment, I'm all for not polluting everything up, but a single solar panel will only run a 75watt bulb for 8 hrs if the batteries are at full charging capacity on a sunny day, that's pretty much only when they are new, my last house in Rancho Murieta Ca. Sacramento valley east of Sacto, hot SOB in the summer & nice breezes at night I had both solar & a small wind turban generators on my old house, running at full capacity with a sunny day & a slight breeze with 25 75watt panels on my roof it would almost stop my meter from turning while using regular electrical stuff in the house, with nothing on it would run backwards... After all is said & done it's only a 1300sqft well insulated, tile roofed, newer, all electric (no gas) house, I only had about a $70 electricity bill every month except summer $85-$90 per month with out the solar & wind running & it brought the summer bills down to $65-$70 in winter it did almost nothing for the bill to be reduced, maybe a couple of dollars a month... I didn't install the system it was installed by the previous owner.. I would say it's probably not worth the added installation cost & maintenance costs, in the long run it would take 30+ years to pay it back at that rate if you had no replacement costs in the mean time (there are costs related)... Not very cost effective in my opinion.... I'm all for conservation but that's ridiculous expectations on that scale, if everyone had them "maybe at best case" 10%-15% total energy saving & they are extremely ugly to look at....