www.google.com/maps/@43.3776423,-99.8584908,3a,75y,269.99h,97.77t/data=!3m6!1e1!3m4!1svlSOCYTcF54YUK2m5VppfA!2e0!7i13312!8i6656?hl=en

Looks like the Winner muni forgot to take down an old 2400V-class pole. That pole may also be a remnant of Tri-State Utilities (Foshay), SD Light & Power, or Interstate Power, depending on its vintage.