Wisconsin data center and energy laws

What Wisconsin has enacted on data center and energy, what each law requires, and what the bills still moving would do. Wisconsin is one of 29 states that enacted a data center and energy law in the 2025 and 2026 sessions.

Bills in scope
8bills in scope
Past committee
2past committee
Most recent action
6 April 2026most recent action

Data center and energy laws enacted in Wisconsin

One data center and energy law enacted in the Wisconsin Legislature in the 2025 and 2026 sessions, newest first. Each links to the legislature's own page.

  • AB 657Relating to: a sales and use tax exemption for nuclear fusion technology projects. (FE)Enacted 2 April 2026

    What it requires: The corporation shall certify qualified nuclear fusion technology projects conducted by business entities for purposes of a sales and use tax exemption. The exemption applies to specified equipment, materials, and software used exclusively at the project location, and to items sold to contractors that become project components.

    Tax incentives and clawbacks

Data center and energy in Wisconsin, by topic

Data center and energy bills in Wisconsin

The bills not yet law, furthest along first, with what each would do.

1Enacted

1Past committee

6Introduced or inactive

8 bills in scope

Past committee

1

AB 840Relating to: certain requirements related to data centers.Passed chamber

What it would do: Requires data centers to use closed-loop cooling systems, file annual water usage reports, and post bonds with the state. Prohibits allocating electric infrastructure costs to other customers and requires renewable energy facilities serving data centers to be located at the data center site.

Introduced or inactive

6

AB 722Relating to: large energy customer fees; electric utility very large customer class; a renewable resource tariff; building requirements for data centers; water usage by large customers; required pay rate on large-scale data center projects; and granting rule-making authority. (FE)Dead

What it would do: Establishes annual fees on large energy customers based on peak electricity demand, ranging from $2,000,000 to $4,000,000+, with half funding a green innovation fund. Requires data centers to meet green building standards, pay prevailing wages, report water usage, and use 70% renewable energy to qualify for sales tax exemptions.

AB 1036Relating to: prohibiting nondisclosure agreements intended to conceal information about a data center from the public.Dead

What it would do: Prohibits political subdivisions and data centers from entering into nondisclosure agreements that conceal data center development details from the public, except agreements protecting trade secrets.

AB 1099Relating to: moratorium on data centers.Dead

What it would do: Creates a moratorium prohibiting any person from operating a data center in Wisconsin unless the state establishes a planning authority, prohibits cost-shifting to residential customers, requires 100 percent renewable energy, mandates prevailing wages, and meets twelve other specified conditions as determined by the secretary of agriculture, trade and consumer protection.

AB 228Relating to: tax incremental financing districts containing qualified data centers. (FE)Dead

What it would do: Creates an exemption from the 12 percent limit findings requirement for tax incremental financing districts where all project costs relate to a qualified data center, and prohibits such districts from later amending their project plans to include unrelated costs.

AB 245Relating to: modifying the sales and use tax exemption for qualified data centers. (FE)Dead

What it would do: Modifies the sales and use tax exemption for qualified data centers to include buildings that provide rental of space and utilities, and excludes buildings used for cryptocurrency creation and blockchain transaction verification.

SB 843Relating to: certain requirements related to data centers.Dead

What it would do: Requires large data center developers to encourage hiring Wisconsin residents, prohibits utilities from allocating data center costs to other customers, mandates renewable energy facilities serving large data centers be located on-site, and requires data centers to use closed-loop cooling systems and file bonds with the state.

Bill titles link to the Wisconsin Legislature's own page.

What LawSignals covers

What counts as data center and energy legislation

In scope: Large-load tariffs and cost allocation; siting, zoning and permitting; tax incentives and clawbacks; on-site and co-located generation; water, cooling and emissions; and grid reliability and load flexibility.

Questions

Does Wisconsin have a data center and energy law?

Yes. Wisconsin enacted 1 data center and energy law in the 2025 and 2026 sessions, among them AB 657. Each is listed on this page with what it requires.

Which data center and energy bills are moving in Wisconsin?

1 bill not yet law has passed a committee or a chamber, the furthest along AB 840 (passed chamber).

What does Wisconsin legislate on most in data center and energy?

Tax incentives and clawbacks (3 bills), Siting, zoning and permitting (2 bills) and Water, cooling and emissions (2 bills).

Are these summaries reviewed by a lawyer?

No. Which bills count as Data center and energy bills, and the line on what each law requires or each bill would do, are drafted by software from the bill's own text and not reviewed by an attorney. Every bill links to the legislature's own record: read the text before relying on it. The list covers bills from the 2025 and 2026 sessions.

Know when Wisconsin's data center and energy law changes

An alert when a bill moves, and one report a month on what changed in every state and Congress.