WASHINGTON, D.C. — A new Associated Press investigation, which found that ethanol hasn’t lived up to some of the government’s clean-energy promises, is drawing a fierce response from the ethanol industry.


In an unusual campaign, ethanol producers, corn growers and its lobbying and public relations firms have criticized and sought to alter the story, which was released to some outlets earlier and is being published online and in newspapers on Tuesday. The Agriculture secretary, Tom Vilsack, told the Des Moines Register that the AP project included “a number of inaccuracies and errors.” Vilsack said farmers were engaged in other conservation practices, including wetland reserve programs, wildlife habitat incentive programs and EQIP, a program that helps farmers adopt conservation practices.


The industry’s efforts, which began one week before the AP project was being published and broadcast, included distributing fill-in-the-blank letters to newspapers editors that call the AP’s report “rife with errors.” Industry officials emailed newspapers and other media, referring to AP’s report as a “smear,” ‘’hatchet job” and “more dumpster fire than journalism.”


“We find it to be just flabbergasting. There is probably more truth in this week’s National Enquirer than AP’s story,” said Geoff Cooper, vice president of research and analysis for the Renewable Fuels Association in a press call with reporters on Monday criticizing the investigation.


The economic stakes for the industry are significant. Congress is working on legislation to do away with the corn-based portion of the mandate, which required oil companies to blend billions of gallons of ethanol into their gasoline. Big Oil is pumping big money into the effort.


The Obama administration, a strong defender of biofuels, is soon expected to slightly ease the law’s requirements. Overnight, such changes would eliminate a huge source of the demand for ethanol, reduce profits for farmers and ethanol producers and likely lower the price of corn.