S.D. Codified Laws § 9-39-3.1
Pursuant to the provisions of S.D. Const., Art. IX, § 3, any municipality owning an electric utility system may, pursuant to an agreement or agreements with any other governmental entities, either within or without the state, which own electric utility systems, acquire, construct, and finance by issuance of its revenue bonds in the manner prescribed in chapter 9-40, electric generation and transmission facilities, or any interest therein, and sell the output, capacity and services of such facilities to such other governmental entities in such respective amounts as shall be determined by such municipality to be necessary or appropriate in order to make the most efficient and effective use of its powers and responsibilities to supply the electric needs of its electric customers, and to this end this section shall be liberally construed.
SDCL 9-39-3.1