CA Pub Util Code Section 399.31

A retail seller may procure renewable energy credits associated with deliveries of electricity by an eligible renewable energy resource to a local publicly owned electric utility, for purposes of compliance with the renewables portfolio standard requirements, if both of the following conditions are met:

(a)

The local publicly owned electric utility has adopted and implemented a renewable energy resources procurement plan that complies with the renewables portfolio standard adopted pursuant to Section 399.30.

(b)

The local publicly owned electric utility is procuring sufficient eligible renewable energy resources to satisfy the target standard, and will not fail to satisfy the target standard in the event that the renewable energy credit is sold to the retail seller.