; (iii) CHP savings; (iv) codes and standards savings of electricity; and (v) fuel-switching energy savings that results in net savings of electricity. (11) Fuel-switching energy savings (A) In general The term fuel-switching energy savings means net energy savings, calculated in accordance with subparagraph (B), from consumer switches from 1 energy source to another, as determined in accordance with regulations promulgated by the Secretary. (B) Calculation For purposes of calculating net energy savings under subparagraph (A)— (i) electricity consumption shall be evaluated based on the average additional quantity of fuel burned at power plants to supply each additional kilowatt-hour of electricity consumption in the region; (ii) electricity and natural gas consumption shall include losses in the transmission and distribution systems; and (iii) fuel-switching that does not result in net cost savings to the consumer shall not be counted. (12) Natural gas savings The term natural gas savings means reductions in natural gas consumption or losses, as determined in accordance with regulations promulgated by the Secretary, that— (A) are achieved through measures implemented after the date of enactment of this section; (B) are additional to business-as-usual customer purchase practices and distribution system efficiency; (C) the retail natural gas supplier claiming or transferring the natural gas savings has played a significant role in achieving; (D) occur in the service territory of the retail natural gas supplier claiming or transferring the natural gas savings; and (E) are limited to— (i) customer facility savings of natural gas, adjusted to reflect any associated increase in electricity consumption or consumption of other fuels at the facility; (ii) reductions in leakage, operational losses, and consumption of natural gas to operate a gas distribution system, achieved by a retail natural gas supplier, as compared to similar leakage, losses, and consumption during a base period of not less than 1 year