No electric cooperative corporation shall sell, transfer, or convey, within the period of any single calendar year, physical plant in excess of five percent in value of such cooperative corporation, based upon the most recent audit of the books of said cooperative corporation, unless consent therefor shall have been obtained by vote of not less than two-thirds of the entire membership of such cooperative corporation cast at any regular or special meeting called for that purpose, after notice in writing to all the membership of such cooperative corporation not less than twenty nor more than thirty days prior to the date of such meeting. Nothing in this section shall prohibit the sale, transfer, conveyance, or exchange of electric cooperative corporation assets to another electric cooperative corporation, an agency of the state of North Dakota or of the government of the United States, nor in exchange for physical plant of equal monetary value to any person or organization, public or private.