15 U.S.C. § 3391a — “Essential agricultural use” defined

include use of natural gas^* in sugar refining for production of alcohol;

include use of natural gas for agricultural production on set-aside acreage or acreage diverted from the production of a commodity (as provided under the Agricultural Act of 1949 [7 U.S.C. 1421 et seq.]) to be devoted to the production of any commodity for conversion into alcohol or hydrocarbons for use as motor fuel or other fuels; and

for the 5-year period beginning on June 30, 1980, include use of natural gas in the distillation of fuel-grade alcohol from food grains or other biomass by facilities in existence on June 30, 1980, which do not have the installed capability to burn coal lawfully.