S.D. Codified Laws § 10-35-1.1
If an agreement is made between a municipality of this state and a governmental entity located outside this state to acquire, construct, or finance electric generation and transmission facilities, if the output, capacity, or services are to be used for the benefit of consumers outside the boundaries of this state, there is hereby levied upon the generation or transmission facilities or both, and the revenues therefrom, all taxes, including licenses, excise, property, and special assessment taxes, which a person, partnership, association, limited liability company, or private corporation engaged in a similar business would have to pay, and the same shall be collected from the state municipality or municipalities or the governmental entity or entities outside the state which own the facilities, either jointly or severally.
SDCL 10-35-1.1