Two universities in the nation's capital have agreed to a major energy deal to buy more than half their power from three new solar power farms planned in North Carolina.
Solar panels have begun to be installed on the White House's roof, the first time solar power will be used for a president's living quarters.
The Energy Department has approved two loan guarantees under the same program that guaranteed loans worth more than $500 million to the now bankrupt solar-panel maker Solyndra.
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