California Code, Public Utilities Code - PUC § 130538

(a) At the discretion of the commission, any bonds issued under this chapter may be secured by a trust agreement by and between the commission and a trustee, which may be any trust company or bank having the powers of a trust company within or without the state.

(b) The trust agreement, or the resolution providing for the issuance of the bonds, may pledge or assign the revenues to be received or the proceeds of any contract pledged and may convey or mortgage the project, or any portion thereof, to be financed out of the proceeds of the bonds.  The trust agreement, or resolution providing for the issuance of the bonds, may contain provisions for protecting and enforcing the rights and remedies of the bondholders as may be reasonable and proper and not in violation of law, including particularly provisions specifically authorized to be included in any resolution of the commission authorizing bonds.

(c) Any bank or trust company which does business under the laws of the United States or of this state, which has its principal place of business in this state, and which may act as depository of the proceeds of bonds or of revenues or other moneys may furnish indemnifying bonds or pledge securities as may be required by the commission.

(d) Any trust agreement may set forth the rights and remedies of the bondholders and of the trustee, and may restrict the individual right of action by bondholders.  In addition, any trust agreement or resolution may contain other provisions that the commission may deem reasonable and proper for the security of the bondholders.