Alliant Energy

Alliant Energy has been ordered by Wisconsin regulators to refile its data center power plans, indicating a regulatory pause on the utility's ability to rapidly expand capacity for the hyperscale sector in its service territory. While specific megawatt allocations were not disclosed in the filing order, the directive requires Alliant to resubmit comprehensive infrastructure plans that address data center demand, suggesting the utility currently lacks adequate documentation to justify capacity expansion timelines to state oversight bodies. This regulatory intervention signals that Midwest utilities face heightened scrutiny on data center commitments, potentially extending project timelines for operators dependent on Alliant's grid capacity in Wisconsin and Iowa. The refiling requirement is notable because it demonstrates regulators are actively blocking expedited data center power approvals rather than rubber-stamping utility proposals, a stark contrast to regulatory environments in Virginia, Texas, and other competitive markets. Hyperscale operators and their infrastructure vendors should anticipate extended utility coordination cycles in the Upper Midwest, with deal timelines shifting from 18-24 months to potentially 30+ months as regulatory review deepens.

Wisconsin's Public Service Commission (PSC) ordered Alliant Energy to refile its data center rate application with significantly reduced redactions, mandating greater transparency around commercial terms and pricing structures that Alliant had initially sought to withhold as confidential business information. The directive affects Alliant Energy's ability to establish dedicated rates for data center customers across its Wisconsin service territory, though specific megawatt capacity or contract values tied to individual data center projects remain undisclosed. This enforcement action signals the PSC's heightened scrutiny of utility data center arrangements and suggests regulators will not defer to operator confidentiality claims when reviewing rate structures that impact broader rate-payer bases. The ruling is notable because it reflects a growing regulatory posture—particularly in Midwest markets—that prioritizes public disclosure of data center economics over operator privacy, creating precedent for future utility filings. Alliant Energy and competing utilities now face clearer expectations that data center rate applications will require material transparency, forcing BD teams and vendors to assume less protection for deal economics during utility commission proceedings.