With PSC Approval, Alliant Set to Become Wisconsin’s Premier Solar-Powered Utility

First round of solar farms to be operational in 2023

The Public Service Commission’s approval today of Alliant Energy’s proposed buildout of new solar power represents the most significant advance yet towards a zero-carbon future in Wisconsin.

With the Commission’s ruling under its belt, Alliant has secured all the necessary permits to set in motion the first wave of a massive solar deployment across Wisconsin. Totaling 675 megawatts (MW), the first six solar farms approved today will take Alliant two-thirds of the way toward its ambitious goal to integrate more than a gigawatt of solar capacity into its base generation portfolio over the next four years.  (Note: a gigawatt is 1,000 megawatts).

When this initial wave of projects is fully operational in 2023, roughly 13% of the electricity sold to Alliant customers will come from a solar farm. Indeed, Alliant is on course to own and operate almost one-half of the state’s solar capacity by 2024, a remarkable percentage given that it accounts for only 16% of the state’s electricity sales.

“We salute Alliant for committing to this bold pivot towards zero-carbon power generated in Wisconsin,” said RENEW Wisconsin Executive Director Heather Allen. “We are hopeful the Public Service Commission’s decision will encourage other utilities to go big on solar power.”

Allen said: “Alliant’s substantial investment in clean energy will produce savings that will be passed along to customers over the lifetimes of these projects. But when you factor in the other benefits from solar power–the job creation opportunities, the stream of revenues for host landowners and their communities, and fewer pollutants discharged into our air and groundwater–this build-out is very much in the public interest.”

In March 2021, Alliant submitted an application for authority to build and operate a second wave of solar power, another six farms totaling 414 MW. Approval of that application would increase Alliant’s solar portfolio to 1,089 MW.

“A solar build-out of this magnitude would have been unthinkable five years ago,” Allen said. “Only a handful of utilities then were thinking about replacing their aging coal plants with carbon-free energy sources like solar. But with these two back-to-back solar applications, WPL appears to be off to the races.”

Once operational, the solar farms listed in the tables below would account for more than 20% of Alliant’s electricity sales in Wisconsin. What is more, the output from these 12 solar farms would surpass generation totals now achieved from Wisconsin’s wind power projects.

So why is Alliant working so hard to integrate a gigawatt of solar capacity into its generation mix? The short answer is that the utility has determined that building solar power today is more cost-effective than prolonging the life of its coal units. This realization came after a thorough analysis that compared the adequacy of its existing generating fleet with the operational savings and flexibility Alliant could achieve from a massive solar build-out.

Here’s how Alliant summarized the conclusions of its modeling work to justify its latest application.

“Based on this result, {Alliant} developed its Clean Energy Blueprint resource plan, its preferred plan to benefit customers, which includes: retiring the Edgewater 5 generating unit by the end of  2022; retiring Columbia 1 and Columbia 2 by the end of 2023 and 2024, respectively; serving customers with capacity and energy from 1,089 MW of new utility-scale solar generation installed in Wisconsin by the end of 2023, and installing distributed solar and battery storage resources in the communities {Alliant} serves.

The PSC is expected to rule on its second application in early 2022.