Ariz. Rev. Stat. § 45-2423
A. The authority, acting through its commission, shall:
B. The authority, acting through its commission, may:
2. Accrue, purchase, exchange, assign, lend and hold long-term storage credits in accordance with this chapter, subject to the following:
7. Make and execute all contracts, including intergovernmental agreements pursuant to title 11, chapter 7, article 3, that shall be signed by the chairperson, or in the chairperson's absence the vice-chairperson, and attested by the secretary, necessary to: