S.D. Codified Laws § 9-41A-41
Except as may be otherwise expressly provided by this chapter or by the municipal power agency, every issue of bonds or notes of the agency shall be payable out of any revenues or funds of the agency, subject only to any agreements with the holders of particular bonds or notes pledging any particular revenues or funds. A municipal power agency may issue types of bonds or notes as it may determine, including bonds or notes as to which the principal and interest are payable exclusively from the revenues from one or more projects, or from an interest therein or a right to capacity thereof, or from one or more revenue producing contracts made by the municipal power agency with any person or persons, or from its revenues generally. Any bonds or notes may be additionally secured by a pledge of any grant, subsidy, or contribution from any public agency or other person, or a pledge of any income or revenues, funds, or moneys of the municipal power agency from any source whatsoever.
SDCL 9-41A-41