Cal. Pub. Util. Code § 651
(a) The commission, in consultation with the State Air Resources Board, shall consider adopting specific biomethane procurement targets or goals for each gas corporation and core transport agent, as defined in Section 980, so that each gas corporation and core transport agent procures a proportionate share, as determined by the commission, of biomethane annually. Before establishing biomethane procurement targets or goals, the commission shall make both of the following findings:
(b) If the commission adopts specific biomethane procurement targets or goals for each gas corporation and core transport agent pursuant to subdivision (a), the commission shall do all of the following:
(3) Ensure that biomethane eligible for any procurement program meets one of the following conditions:
(B) The biomethane is delivered to California through a common carrier pipeline and meets both of the following requirements:
(ii) The seller or purchaser of the biomethane demonstrates that the capture or production of biomethane directly results in at least one of the following environmental benefits to California: