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primary energy source

Defined in 2 places across 2 titles of the United States Code.

“primary energy source” means the fuel or fuels used for the generation of electric energy, except that such term does not include, as determined under rules prescribed by the Commission, in consultation with the Secretary of Energy—

(i) the minimum amounts of fuel required for ignition, startup, testing, flame stabilization, and control uses, and

(ii) the minimum amounts of fuel required to alleviate or prevent—

(I) unanticipated equipment outages, and

(II) emergencies, directly affecting the public health, safety, or welfare, which would result from electric power outages;

Source

The term “primary energy source” means the fuel or fuels used by any existing or new electric powerplant, except it does not include, as determined under rules prescribed by the Secretary—

(A) the minimum amounts of fuel required for unit ignition, startup, testing, flame stabilization, and control uses, and

(B) the minimum amounts of fuel required to alleviate or prevent (i) unanticipated equipment outages and (ii) emergencies directly affecting the public health, safety, or welfare which would result from electric power outages.

Source