(a) Nothing in this chapter shall be construed as authorizing the authority, and it is not authorized, to mortgage or otherwise encumber any of its property of any kind, real, personal, or mixed, or any interest in property, or to acquire any property or interest subject to a mortgage or conditional sale; provided, however, that this section shall not be construed as preventing the pledging of the revenues of the authority as provided by this chapter.
(b) Nothing in this chapter shall be construed as authorizing the sale, release, or other disposition of property of any kind, real, personal, or mixed, or any interest in property, by the authority or through any court proceedings or otherwise; provided, however, that the authority may sell for cash any property or interest if the board by affirmative vote of 11 of its members determines that the property or interest is not necessary to the business of the authority and approves the terms of the sale. Except by sale as expressly authorized by this section, authority property or interest may not come into the ownership or control, directly or indirectly, of any person, firm, or corporation other than a public authority created under the laws of the state.

(c) All authority property is exempt from forced sale, and nothing in this chapter authorizes the sale of any of the property of the authority under a judgment rendered in a suit, and a sale of that kind is prohibited.
(d) Notwithstanding any restrictions or provisions in this section or in this chapter, the authority, acting by a majority vote of the board, may construct or purchase, from any person, firm, or corporation (referred to in this subsection as “customer”) with which the authority has contracted to sell hydroelectric power, transmission lines and other property used or to be used by the customer for the transmission of or in connection with power purchased or to be purchased from the authority. The authority may lease all or any portion of that property to the customer for all or a portion of the time during the term of the hydroelectric power purchase contract. The lease may contain provisions that are valid and enforceable giving the lessee the right to purchase from the authority all or any portion of the property at or within the time specified in the lease and for a price and on terms and conditions specified in the lease; provided, however, that the price may not be less than the depreciated value, determined in the manner prescribed in the lease, plus one percent of the original cost of the property.