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Beyond the White House, wind advocates see Mr. Baucus as a key player. He told a trade publication after the midterms that extending the program was a priority and that he was “going to find a place” for it either in December or January.

Rob Sargent, an energy program director for Environment America, acknowledged that extending the Treasury program “will be difficult in the lame-duck” session and said he could not predict what might happen in the next Congress.

While wind-energy proponents hailed the recent federal approval of the major Cape Wind project off Massachusetts, the industry overall is struggling to maintain momentum, even with the stimulus money. After a record year in 2009 of adding megawatts, fewer winds farms are being built with growth slowing to 2007 levels.

“We’re working strongly to make our case,” Mr. Sargent said.