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In 1995 the USDA released a report stating that the net energy balance of corn ethanol in the United States was an average of 1.24. It was previously considered to have a negative net energy balance. However, due to increases in corn crop yield and more efficient farming practices corn ethanol had gained energy efficiency. [3]
One major drawback with corn ethanol, is the energy returned on energy invested , meaning the energy outputted in comparison to the energy required to output that energy. Compared to oil, with an 11:1 EROI, corn ethanol has a much lower EROI of 1.5:1, which, in turn, also provides less mileage per gallon compared to gasoline. [7]
The total amount of energy input into the process compared to the energy released by burning the resulting ethanol fuel is known as the energy balance (or "energy returned on energy invested"). Figures compiled in a 2007 report by National Geographic [ 68 ] point to modest results for corn ethanol produced in the US: one unit of fossil-fuel ...
Since the 1970s, the U.S. has subsidized ethanol produced from food crops, especially from corn, thus providing a homegrown, alternative fuel source for our automobiles. But for multiple reasons ...
The ethanol and corn industries on Thursday slammed an advisory board to the U.S. Environmental Protection Agency for a draft report that found there could be little climate benefit to using corn ...
A combine harvests corn to be used for ethanol as a tractor hauls a grain cart on a section of farmland in Michigan on Thursday, November 16, 2023. ... while Powell’s background is in energy ...
Sugarcane ethanol has an energy balance seven times greater than corn ethanol. [101] As of 2007, Brazilian distiller production costs were 22 cents per liter, compared with 30 cents per liter for corn-based ethanol. [102] Corn-derived ethanol costs 30% more because the corn starch must first be converted to sugar before distillation into ...
Based on a study by Dias de Oliveira et al. (2005), corn-based ethanol requires 65.02 gigajoules (GJ) of energy per hectare (ha) and produces approximately 1236.72 kg per ha of carbon dioxide (CO 2), while sugar cane-based ethanol requires 42.43 GJ/ha and produces 2268.26 kg/ha of CO 2 under the assumption of non-carbon neutral energy ...