Nebraska, the country's second-largest producer of corn ethanol, will add two plants to its roster of 24 by the end of the year, raising its annual output by 17.5%, to 2 billion gallons. The Aventine plant at Aurora and an Archer Daniels Midland plant at Columbus are expected to process up to 350 million gallons a year. But the Renewable Fuels Association has warned that Nebraska could lose 13,750 jobs if federal tax incentives for ethanol are allowed to expire Dec. 31. "We broke it down based on gallons of production," said Matt Hartwig of RFA. "So Nebraska, being a large producer, would have one of the biggest impacts in terms of job loss."