By spring of next year the White House will be installed with roof mounted solar panels. Although these panels will not provide power for the entire executive mansion they will at least provide hot water and some electricity.
The White House has an interesting history with solar power and you can read the original source article over at cnet:.
http://news.cnet.com/8301-11128_3-20018542-54.html?tag=topImage2-TwisT