As lawmakers ramp up efforts to kill a key wind energy incentive that expires at the end of the year, the wind industry is concentrating on winning concessions in a potential federal tax-code overhaul.

The wind production tax credit, which expires Dec. 31, pays wind power producers 2.3 cents per kilowatt-hour. It has many boosters on both sides of the aisle, with some of its most vocal supporters being Republicans from breezy Midwest states. But it also has its share of detractors, mainly among fiscal conservatives and Southeast lawmakers.