US energy company Minnesota Power has completed installation of a 48MW wind farm near New Salem, North Dakota.
Operation at the Bison 1B site marks the end of the first of three phases in the development, which will eventually have a capacity of 292MW. Bison 1A was completed one year ago.
The 15 turbines utilised on this stage were supplied by German electronics giant Siemens.
Work on Bison 2 and 3 has already started and is set to be completed by the end of this year.