Wisconsin's 30th District Data Center Tax Fight Explained
A protest in River Falls, Wisconsin, targeted a state tax exemption for data center equipment, which critics argue has fueled data center growth and burdened ratepayers. This issue has become a key point in a local assembly district election, with the incumbent defending the legislation against claims of conflict of interest and negative economic impacts. Lawmakers are actively debating the costs and benefits of data center development, especially concerning electricity and water usage, reflecting a broader national trend of increased scrutiny.
About 50 people gathered at Veterans Park in River Falls, Wisconsin, to protest a state tax exemption for data center equipment and software. The rally, organized by GROWW, directly challenged Republican Assemblyman Shannon Zimmerman, the author of the legislation. Democrats contend that the $1.6 billion tax exemption has spurred a data center building boom across Wisconsin and shifted costs onto ratepayers.
Kevin Knoke, Zimmerman's Democratic challenger in the 30th Assembly District race, has centered his campaign on ending corporate tax giveaways and advocating for ratepayer protections, environmental safeguards, and increased transparency from data center operators. Knoke also accused Zimmerman of a conflict of interest due to his prior executive roles at AI companies that could benefit from the tax breaks. Zimmerman refuted these allegations, dismissing them as political maneuvering, and noted the exemption was part of a bipartisan budget signed by Governor Tony Evers.
Zimmerman's initial 2023 legislation, which was backed by Microsoft and other business groups, did not pass as a standalone bill but was ultimately integrated into the state's budget. A subsequent measure, AB840, authored by Zimmerman to address concerns regarding energy, water, land, and taxpayer impact from data center growth, passed the Wisconsin Assembly but failed in the Senate. Concurrently, the Wisconsin Public Service Commission has begun modifying electric rates for data center-scale customers to safeguard residential ratepayers.
This local contention mirrors a national surge in scrutiny over data centers, with over 260 related bills introduced across 31 states by April 2026. The legislative focus is shifting from tax incentives to utility tariffs, ratepayer protections, water disclosure, and construction moratoriums. For example, Virginia is considering numerous data center bills, and Maine recently enacted a moratorium on large data centers. In Belvidere, Illinois, Datawatt Energy's proposed Project Hawkeye is under discussion with city leaders, raising questions about its substantial water and energy demands.