Right now, on the federal level, there's a bill in Congress that calls for something similar. And it is doable, but there's a lot of resistance from legislators who represent states that have competing energy industries.
The bill calls for the US to get 15% of its electrical energy from renewable sources by the year 2020. Sources such as wind and solar.
It would seem to me that, with the cost of fuel today and the fact that it causes pollution and global warming, it is insane to not have us give a push toward a more efficient, self-reliant, and cleaner energy system.
There's a petition out there that is trying to make sure that this provision is not torpedoed by Big Energy types. Your can read it (and hopefully sign it) at
http://www.energybill2007.us. BTW - this legislation and petition also calls for a 35 mpg CAFE standard by 2020 as well.