MADISON, Wis. (AP) — Construction work on a high-voltage transmission linking Iowa and Wisconsin has been completed and the line is fully operational, a group of utilities announced Sept. 27.

American Transmission Company, Dairyland Power Cooperative and ITC Midwest began work on the 102-mile Cardinal-Hickory Creek line between Iowa’s Dubuque County and Wisconsin’s Dane County in April 2021. Construction wrapped up late the previous week, ITC Midwest spokesperson Rod Pritchard said. The 345-kilovolt line was fully energized on Sept. 26.

The utilities say the line will improve electrical reliability and support renewable energy projects.

A coalition of conservation groups filed a federal lawsuit in March seeking to block the final mile of construction across the Upper Mississippi River National Wildlife Refuge near Cassville, Wisconsin. They argued that the line would damage the refuge and that the utilities improperly acquired the land from the U.S. Fish and Wildlife Service. A federal appellate court in May allowed the work to continue, but the original lawsuit is still pending.

Wendy Bloom, senior attorney for the Environmental Law and Policy Center, which is representing the conservation groups, said Sept. 27 that the center remains hopeful they’ll win the lawsuit.

The utilities said in a Sept. 27 news release that they tried to protect the refuge during construction, using wooden mats to reduce soil disturbance, and that no grading took place.

John Podesta, senior advisor to President Joe Biden on international climate policy, praised the line’s completion.

“The Midwest and all of America need to harness the power of clean energy and take it to market,” Podesta said in a statement. “It takes perseverance to build the infrastructure we need and the Cardinal-Hickory Creek Project proves that we can get the job done by bringing clean, affordable power to Wisconsin and Iowa.”