The principal of, and interest on, the bonds shall be payable in lawful money of the United States at the office of the treasurer of the commission, or at other places as may be designated, or at both the office and other places at the option of the holders of the bonds.
Source:
Section 190314, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=190314..