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A semiconductor material could make solar cells three times as efficient.
New solid-state power-management devices will charge cars fast and make the power grid more flexible and efficient.
But the lack of comprehensive legislation could prevent international agreements needed to limit global warming.
As Congress prepares to vote on a comprehensive spending bill, U.S. energy projects such as ARPA-E hang in the balance.
A pilot plant at a winery not only generates electricity, it heats the water.