Why don't you sign up and have a look at how much users are saving? We've had 36 downloads over the last week - friends in our immediate network. They're your average joe user - none of them leave their PCs on at night. Enpower kicks in when they forget to power down, and you'd be surprised to learn how often that is.
Please don't call an app from a startup spyware. It's unlikely we'll ever have the resources to do what it takes to look "squeaky clean" from your lofty perspective.
Green Facebook apps have seen much more adoption than we aspire to achieve. Little Green Patch, a social gardening game has 1,889,557 active monthly users. (http://www.facebook.com/applications/%28Lil%29_Green_Patch/7...) They state their advertisers will donate towards reforestation if you exchange "packets of seeds" with your friends. I think our effort could be just as meaningful, if not more. I do admit that a download is a significant barrier and we're not aiming to reach magical numbers within a week. It'll be slow, and we're ready for it.
And finally, if 30 million kWH means so little, why spend a 100 million dollars of taxpayers' money (http://www.whitehouse.gov/the_press_office/Nellis-Solar-Powe...) to pump that amount of clean energy into the grid? Surely, the Government must know better.