MDU Resources Group division Montana-Dakota Utilities (MDU) has signed a 25-year agreement with ALLETE Clean Energy (ACE) subsidiary to purchase power from the Thunder Spirit Windfarm expansion in southwest North Dakota, US.

Under the agreement, MDU is entitled to buy the project after construction nears completion.

Discover B2B Marketing That Performs

Combine business intelligence and editorial excellence to reach engaged professionals across 36 leading media platforms.

Find out more

MDU's president and chief executive officer (CEO) Nicole Kivisto said: “Our relationship with ACE on the first phase of Thunder Spirit Wind proved to be a winning formula.

“We are in need of additional energy to meet our growing demands, and with the easements, interconnection to the grid, and permits already in place from the first phase of Thunder Spirit Wind, it makes this a great project for Montana-Dakota.”

"We are in need of additional energy to meet our growing demands."

The expansion of the Thunder Spirit Wind project is expected to increase the combined production of renewable energy to about 150MW and will boost MDU’s generation portfolio from approximately 20% renewables to 25%.

The 107.5MW Thunder Spirit Wind project was originally constructed by ACE and later acquired by MDU in December 2015.

GlobalData Strategic Intelligence

US Tariffs are shifting - will you react or anticipate?

Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.

By GlobalData

An estimated construction cost of the project is $85m and it is expected to go online in December 2018.

Power Technology Excellence Awards - Nominations Closed

Nominations are now closed for the Power Technology Excellence Awards. A big thanks to all the organisations that entered – your response has been outstanding, showcasing exceptional innovation, leadership, and impact.

Excellence in Action
Recognised with three 2025 Power Technology Excellence Awards, Hover Energy is at the forefront of intelligent microgrids and distributed renewables. Explore how its AI-enabled Microgrid Management System™ , strategic partnerships and networked microgrids are rebuilding the grid from the ground up for a more flexible, resilient energy future.

Discover the Impact