 Construction began in 2010 on the 76-MW Bison Wind I Energy Center near New Salem, N.D. Bison I represents the first wave of Minnesota Power-constructed wind farms that will be built in south central North Dakota and linked to Minnesota.by way of a direct current (DC) transmission line.ALLETE finalized an agreement January 1, 2010 to purchase a 250-kilovolt DC line between Center, N.D. and Hermantown, Minn. (near ALLETE headquarters in Duluth) and phase out a long-term contract to buy coal-generated electricity now transmitted over the line.