S.D. Codified Laws § 47-21-46.4
To the extent not superceded by the specific provisions of §§ 47-21-46.1 to 47-21-46.4, inclusive, the uniform commercial code and other applicable laws remain in full force and effect and supplement the provisions of §§ 47-21-46.1 to 47-21-46.4, inclusive. Any rural electric cooperative may make a single filing under §§ 47-21-46.1 to 47-21-46.3, inclusive, and the secretary of state shall accept the same as a single filing. The financing statement shall identify the rural electric cooperative as a transmitting utility and shall be indexed under § 57A-9-501(b), but the index may also refer to the secretary of state's recording data for real estate records under §§ 47-21-46.1 to 47-21-46.3, inclusive, and the retention by the secretary of state of a microfilm or other photographic copy of the document filed in the real estate records shall be sufficient to comply with the retention requirements of § 57A-9-522.
SDCL 47-21-46.4