California Code, Public Utilities Code - PUC § 8372

(a) Within 180 days of the first request from a customer or developer to establish a microgrid, the governing board of a local publicly owned electric utility shall develop and make available a standardized process for the interconnection of a customer-supported microgrid, including separate electrical rates and tariffs, as necessary. The separate rates and tariffs shall not compensate a customer for the use of diesel backup or natural gas generation, except as either of those sources is used pursuant to Section 41514.1 of the Health and Safety Code, or except for natural gas generation that is a distributed energy resource.

(b) The governing board shall ensure the microgrid rates and charges do not shift costs to, or from, a microgrid customer or nonmicrogrid customer, and shall ensure each microgrid and its components comply with the local publicly owned electric utility's applicable regulatory requirements.