Okla. Stat. tit. 74, § 1226.10

The exercise of the powers granted by this act will be in all respects for the benefit of the people of the state, for the increase of their education, commerce and prosperity, and as the operation and maintenance of projects by the Authority will constitute the performance of essential governmental functions, the Authority shall not be required to pay any taxes or assessments upon any project or any property acquired or used by the Authority under the provisions of this act or upon the income therefrom.