Cal. Health & Safety Code § 39920

On or before July 1, 2001, the state board shall implement a program for tracking the emission reduction credits made available by the program required under Section 39915, and for facilitating the banking, trading, and purchasing of those credits in order to expedite the construction of new, clean generating facilities in the state. The state board shall establish criteria for the development of a state emission reduction credits bank, which shall ensure that a specified percentage of emission reduction credits created pursuant to section 39915 be contributed to the bank for the purpose of making emission reduction credits available for new, clean generation capacity.