Cal. Pub. Util. Code § 120224.3

Notwithstanding Section 120222, the board may direct the purchase of any supply, equipment, or materials without observance of any provision requiring contracts, bids, or advertisements upon a finding by two-thirds of all members of the board that there is only a single source of procurement therefor and that the purchase is for the sole purpose of duplicating, repairing, or replacing supply, equipment, or materials that are in use, including upgrades or migrations of proprietary intellectual property.