Last year the Environmental Protection Agency proposed to reduce the amount of ethanol in fuel for the first time, acknowledging that a biofuel law that both Republicans and Democrats had championed nearly a decade ago was not working as well as expected.
A final decision was due before the end of the year, but the EPA said today the final rule will come in 2015.
The ethanol targets are required by a 2007 law that tried to address global warming, reduce dependence on foreign oil and boost the rural economy by requiring oil companies to blend billions of gallons of biofuels into gasoline annually.
Meanwhile, next-generation biofuels, made from agricultural waste such as wood chips and corncobs, have not taken off as quickly as Congress had required and the Obama administration anticipated.
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Last year's proposal to lower ethanol levels was not expected to mean much for consumers at the pump, but it angered corn growers and ethanol companies who have since lobbied the government to reverse it. Ethanol is a fuel additive primarily made from corn.
Industry groups claimed victory at the latest delay, one of many that have plagued the ethanol rule as the EPA struggles to balance ethanol production and fuel demand.
The EPA said in a notice today in the Federal Register that its 2013 proposal had "generated significant comment and controversy," particularly in regard to meeting ambitious ethanol targets set forward in the 2007 law.
The agency said it has been evaluating the comments in light of the Obama administration's "commitment to the goals of the statute to increase the use of renewable fuels."
President Barack Obama has championed biofuels since his days representing Illinois in the Senate, and his administration had resisted previous calls to lower biofuel volumes or repeal the law.