This has been in the news lately and apparently many reporters don't know about the existing White House solar system. Here's more info for those who're interested.
http://www.solardesign.com/projects/project_display.php?id=14The National Park Service retained Solar Design Associates to design and install three solar energy systems at the Presidential compound. These systems demonstrate the most popular solar applications in use today.
* Two of the systems deliver thermal energy for hot water and pool heating and one produces electricity directly from the sun with photovoltaics.
* The PV system directly feeds solar-generated power into the White House distribution system, providing electricity wherever it is needed. PV Modules were provided by Evergreen Solar
* Solar thermal components were provided by SunEarth.
* DC/AC inverters were provided by SMA-America and consist of a bank of Sunny Boy 2500 inverter modules.