California Code, Public Utilities Code - PUC § 353.13

(a) The commission shall require each electrical corporation to establish new tariffs on or before January 1, 2003, for customers using distributed energy resources, including, but not limited to, those that do not meet all of the criteria described in Section 353.1.  However, after January 1, 2003, distributed energy resources that meet all of the criteria described in Section 353.1 shall continue to be subject only to those tariffs in existence pursuant to Section 353.3, until June 1, 2011, except that installations that do not operate in a combined heat and power application will be subject to those tariffs in existence pursuant to Section 353.3 only until June 1, 2006.  Those tariffs required pursuant to this section shall ensure that all net distribution costs incurred to serve each customer class, taking into account the actual costs and benefits of distributed energy resources, proportional to each customer class, as determined by the commission, are fully recovered only from that class.  The commission shall require each electrical corporation, in establishing those rates, to ensure that customers with similar load profiles within a customer class will, to the extent practicable, be subject to the same utility rates, regardless of their use of distributed energy resources to serve onsite loads or over-the-fence transactions allowed under Sections 216 and 218.  Customers with dedicated facilities shall remain responsible for their obligations regarding payment for those facilities.

(b) In establishing the tariffs, the commission shall consider coincident peakload, and the reliability of the onsite generation, as determined by the frequency and duration of outages, so that customers with more reliable onsite generation and those that reduce peak demand pay a lower cost-based rate.