41 CFR § 102-117.130
Must I select TSPs who use alternative fuels?
June 9, 2020
No, but, whenever possible, you are encouraged to select TSPs that use alternative fuel vehicles and equipment, under policy in the Clean Air Act Amendments of 1990 (42 U.S.C. 7612) or the Energy Policy Act of 1992 (42 U.S.C. 13212).