Wisconsin-based Dairyland Power Cooperative is upgrading its system with a slate of new investments to bolster electric reliability and affordability, including a recently completed major transmission line that will improve grid flexibility in the Midwest.
The projects underscore Dairyland’s commitment to growth and innovation while mitigating financial risk, said Brent Ridge, president and CEO of the La Crosse-based co-op, which serves 24 distribution cooperatives and 27 municipal utilities.
In late September, the 102-mile Cardinal-Hickory Creek Transmission Line entered service after more than a decade of planning and construction. The 345-kilovolt power line, which Dairyland co-owns with ITC Midwest and American Transmission Co., will reduce grid congestion in the Midcontinent Independent System Operator (MISO) region and improve system reliability and flexibility as fossil fuel plants retire.
“The safe completion of Cardinal-Hickory Creek is a victory for energy consumers and the environment,” Ridge said. “As a backbone interconnection, the line will finally serve as the vital link to a long waiting list of regional renewable energy projects. [It] also strengthens grid reliability and resilience at a time of great change in the energy industry.”
As of June 2024, 160 renewable generation projects totaling 24.5 gigawatts across Wisconsin, Iowa and the Upper Midwest were depending on completion of the line to deliver power. That is enough energy to power millions of homes and businesses, according to Dairyland.
The line is “a huge boon to reliability,” said Kevin Nordt, Dairyland executive vice president and chief strategy officer. “By expanding and beefing up the transmission networks across MISO, that is also a very important contributor to the overall reliability of MISO and the Eastern Interconnection and all MISO’s members.”
The project, which involved over 10 years of planning and construction, is a success story for Dairyland and the power sector broadly. Many high-voltage transmission lines can take a decade or longer to complete or are scrapped due to permitting and cost allocation challenges. Those hurdles are slowing efforts to expand the nation’s transmission capacity, which some experts say may need to double or triple by 2050 to meet power demand growth forecasts and accommodate more weather-dependent energy resources such as wind and solar.
To ease permitting challenges, more than 95% of the Cardinal-Hickory Creek line in Wisconsin was co-located within existing infrastructure rights of way. Dairyland and its utility partners also provided opportunity for public comment and sought to minimize environmental impacts to the Upper Mississippi River National Wildlife and Fish Refuge, including using a robust set of mitigation and restoration measures.
“Getting Cardinal-Hickory Creek approved and bringing it to fruition took longer than we expected,” Ridge said. “Despite litigation that delayed progress, I applaud our teams for being focused on our end goal of building a transmission line to enable the development of more clean, reliable energy and growth for our communities.”
The transmission line isn’t the only new development for Dairyland, which provides power to about 700,000 people through the co-ops and municipal utilities it serves.
Dairyland is part of an NRECA consortium that, along with Georgia Transmission Corp., is negotiating $97.9 million in Department of Energy funding for transmission upgrades, including use of advanced overhead conductors to increase line capacity.
Also last fall, the co-op was tapped for a $15.6 million loan from the Department of Agriculture to build solar-and-storage facilities and $28 million in DOE funding to develop three long-duration battery storage facilities in rural parts of Illinois, Iowa and Wisconsin.
The co-op’s biggest funding award, announced in September, was $579 million from USDA to help Dairyland purchase over 1,000 megawatts of wind and solar power, and battery energy storage. It will also allow Dairyland to refinance existing coal assets at low interest rates to help pay them off.
The renewable and storage assets will help serve significant demand growth, including from new data center loads, while providing flexible, competitively priced power, said Nordt. They will also make renewable energy represent more than half of Dairyland’s resource mix within the next decade compared with roughly a quarter now.
“Renewables in particular are very nicely priced for us, so much more so with the grant,” he said. And with new storage capacity, “we’re able to store lower-priced energy and avoid having to make a higher-priced purchase to serve our members during peak time. That is a huge economic benefit.”
Molly Christian is a staff writer for NRECA.