California Code, Revenue and Taxation Code - RTC § 721.5

(a) Notwithstanding Section 721 or any other provision of law to the contrary, commencing with the lien date for the 2003-04 fiscal year, the board shall annually assess every electric generation facility with a generating capacity of 50 megawatts or more that is owned or operated by an electrical corporation, as defined in subdivisions (a) and (b) of Section 218 of the Public Utilities Code.

(b) For purposes of subdivision (a), “electric generation facility” does not include a qualifying small power production facility or a qualifying cogeneration facility within the meaning of Sections 201 and 210 of Title II of the federal Public Utility Regulatory Policies Act of 1978 (16 U.S.C. Secs. 796(17)and (18) and 824a-3), and the regulations adopted for those sections under that act by the Federal Energy Regulatory Commission (18 C.F.R. 292.101-292.602), or a facility producing power from other than a conventional power source that is an exempt wholesale generator, as defined in the federal Public Utility Holding Company Act of 2005 (42 U.S.C. Sec. 16451(6)).