; and (2) not later than 2 years after the date of enactment of this section, finalize regulations, or amended existing regulations, to implement this section. (k) Existing vegetation management, facility inspection, and operation and maintenance plans Nothing in this section requires an owner or operator to develop and submit a new plan under this section if a plan consistent with this section has already been approved by the Secretary concerned before the date of enactment of this section. . (b) Clerical amendment The table of contents for the Federal Land Policy and Management Act of 1976 ( 43 U.S.C. 1761 et seq.), is amended by inserting after the item relating to section 511 the following: Sec. 512. Vegetation management, facility inspection, and operation and maintenance relating to electric transmission and distribution facility rights-of-way. . 2311. Study of combined heat and power systems and waste heat to power systems (a) Definitions In this section: (1) Additional services The term additional services means the provision of supplementary power, backup or standby power, maintenance power, or interruptible power to an electric consumer by an electric utility. (2) Waste heat to power system (A) In general The term waste heat to power system means a system that generates electricity through the recovery of waste energy. (B) Exclusion The term waste heat to power system does not include a system that generates electricity through the recovery of a heat resource from a process the primary purpose of which is the generation of electricity using a fossil fuel. (3) Other terms (A) Purpa The terms electric consumer , electric utility , and interconnection service have the meanings given those terms in the Public Utility Regulatory Policies Act of 1978 ( 16 U.S.C. 2601 et seq.), within the meaning of title I of that Act ( 16 U.S.C. 2611 et seq.). (B) Epca The terms combined heat and power system and waste energy have the meanings given those terms in section 371 of the Energy Policy and Conservation Act ( 42