California Code, Public Utilities Code - PUC § 12821.5

(a) Whenever residential light, heat, or power is furnished through a submeter system by a master-meter customer for sale to users who are tenants of a mobilehome park, apartment building, or similar residential complex, the master-meter customer is responsible for maintenance and repair of its submeter facilities beyond the master meter, and nothing in this section requires a district to make repairs to or perform maintenance on the submeter system.

(b) Every master-meter customer shall provide an itemized billing of charges for light, heat, and power to each individual user generally in accordance with the form and content of bills of the district to its residential customers, including, but not limited to, the opening and closing readings for the meter, and the identification of all rates and quantities under the applicable rate structure. The master-meter customer shall charge each user of the service at a rate which does not exceed the rate which would be applicable if the user were receiving residential light, heat, or power directly from the district. The master-meter customer shall also post, in a conspicuous place, the applicable prevailing residential rate schedule, as published by the district.

(c) The district shall notify each master-meter customer of its responsibilities to its users under this section.