A majority of the members of the commission shall constitute a quorum for the transaction of business, and all official acts of the commission, except as otherwise provided in Section 130102.5, shall require the affirmative vote of a majority of the members of the commission.
Source:
Section 130102, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=130102..