S.D. Codified Laws § 49-33-3
There shall be annexed to the articles of incorporation described by § 49-33-1 an affidavit, signed by at least three of the incorporators therein, setting forth that the signatures thereto are genuine and that it is intended in good faith to construct or maintain and operate the street railway or railways or electric lighting and power plants therein referred to, and thereupon such articles shall be filed in the office of the secretary of state, who shall endorse thereon the date thereof and record the same in a book to be kept by him for that purpose. The secretary of state shall be entitled to the same fees provided by law for the filing and recording of articles of incorporation in this state; like fees shall be paid for any amendment at any time of the original articles.
SDCL 49-33-3