Scope
2025 Wisconsin Assembly Bill 840, as introduced, would have created ss. 196.20(10), 196.492 and 299.70 of the statutes relating to certain requirements related to data centers. The Assembly adopted Assembly Substitute Amendment 1 and passed the bill on 20 January 2026 (Ayes 53, Noes 44, Paired 2); the Senate Committee on Utilities, Technology and Tourism recommended concurrence on 13 March 2026 (Ayes 3, Noes 2); and per the official history the Senate failed to concur in it pursuant to Senate Joint Resolution 1 on 23 March 2026.
- Geographic scope
- Wisconsin
- Jurisdiction
- State
- Authority type
- Legislature
- Issuing authority
- Wisconsin Legislature
Dates
- Adopted
- No adoption day is recorded
- Effective
- Never took effect (did not pass)
- Scheduled expiration
- None scheduled
- Ended
- 23 March 2026
- Completion condition
- None stated
- Source document
- The source page states no document date
- Last checked
- 23 September 2026 (earlier than tracker date 5 October 2026; not an automatic status change)
Summary
Wisconsin Assembly Bill 840 of the 2025-2026 session proposed requirements related to data centers. The Assembly passed it on 20 January 2026 as amended by Assembly Substitute Amendment 1, by 53 votes to 44. A Senate committee recommended concurrence on 13 March 2026, but the official bill history records that the Senate failed to concur in it pursuant to Senate Joint Resolution 1 on 23 March 2026, so it did not become law.
What this does not establish
- The version the Assembly passed (Assembly Substitute Amendment 1) was not analyzed; the introduced text, a supporting source, describes rate-making, on-site renewable energy, closed-loop cooling, water-use reporting, bonding and site-restoration requirements that may differ from the passed version.
- A Senate substitute amendment was offered on 17 March 2026 but the history records no action on it.
- Companion 2025 Senate Bill 843 is a separate record.
Unresolved questions
None recorded.
Relationships
Supersession means a later instrument replaces the earlier legal effect. Repeal links identify the repeal instrument and the measure it ends. A later implementation or related letter is not treated as a replacement unless the record says so.
- Related, not a replacement Senate Bill 843 (2025) on data center energy and water requirements (did not pass) (Did not pass)
Sources
https://docs.legis.wisconsin.gov/2025/proposals/reg/asm/bill/ab840
- 2025 Assembly Bill 840, introduced text Introduced bill text with Legislative Reference Bureau analysis · 9 January 2026