S.D. Codified Laws § 49-34A-8.3

In addition to any other rate authorized by this chapter, the commission may approve business development rates authorizing a utility to negotiate and agree with a customer for specific rates which differ from standard rates otherwise applicable to the customer. All business development rates shall be approved as being in the public interest under such terms and conditions as the commission may provide in a proceeding under this chapter. If approved, no such business development rate constitutes a violation of § 49-34A-3 or a change in rates pursuant to § 49-34A-12. The provisions of this section apply to any business development rate tariff approved by the commission in existence on July 1, 1996.