S.D. Codified Laws § 10-4-44
For renewable energy facilities with less than five megawatts of nameplate capacity, all real property used or constructed for the purpose of producing electricity using a renewable resource as an energy source is classified for tax purposes as renewable energy property and shall be assessed and taxed in the same manner as other real property and shall be locally assessed by the county director of equalization pursuant to § 10-3-16. For the purposes of §§ 10-4-42 to 10-4-45, inclusive, the first fifty thousand dollars of the assessed value of the renewable energy property or seventy percent of the assessed value of the renewable energy property, whichever is greater, is exempt from the real property tax. However, for geothermal renewable energy facilities that produce energy, but not electricity, this exemption is limited to the first four continuous years for residential geothermal renewable energy facilities and the first three continuous years for commercial geothermal renewable energy facilities.
SDCL 10-4-44