Tex. Util. Code § 41.160

Securitized bonds are not a debt or obligation of the state and are not a charge on its full faith and credit or taxing power. The state pledges, however, for the benefit and protection of assignees, financing parties, and the electric cooperative, that it will not take or permit, or permit any agency or other governmental authority or political subdivision of the state to take or permit, any action that would impair the value of securitized property, or, except as permitted by Section 41.157, reduce, alter, or impair the securitized charges to be imposed, collected, and remitted to financing parties, until the principal, interest and premium, and any other charges incurred and contracts to be performed in connection with the related securitized bonds have been paid and performed in full. Any party issuing securitized bonds is authorized to include this pledge in any documentation relating to those bonds.