Mason planning commission narrowly recommends new M3 zoning for data centers after heated public hearing

The City of Mason Planning Commission recommended the City Council adopt Ordinance 2‑66, which would add a new "technology innovation" M3 zoning district and a package of development standards aimed at data centers, after a long public hearing and close votes.

The commission opened the public hearing at 6:36 p.m. Tuesday and heard more than an hour of public comment from residents who said the proposal risks local water and air quality, noise, the rural character of the area and property values. Mayor Russ Whipple, appearing as the ordinance applicant, told commissioners the text amendment is a proactive attempt to create standards for the state’s new tax‑incentivized enterprise data centers rather than to approve a specific project. "This is about an ordinance to create standards for data centers. It's not about approving a data center," Whipple said in his presentation, and he described model provisions drawn from other cities for setbacks, screening, lighting and noise limits.

Many commenters urged the commission to reject the ordinance or strengthen it. Residents questioned who would use the centers, how much water they could consume, and whether Consumers Energy and state regulators could safely support such development. A number of speakers asked that the city follow its master plan and not allow a large industrial data center at the city fringe without a future land‑use amendment.

Staff described the measure as a text amendment — no parcel or project is before the commission — and said the M3 district would set a far higher bar than the existing M1 and M2 zoning. Key features explained by staff include a minimum 300‑acre district size (with a 50‑acre minimum parcel within the district), municipal water connections (staff said the state prevents direct aquifer withdrawal for qualifying projects), enhanced buffering and screening standards, lower noise limits than manufacturing zoning, and lighting standards that favor dark‑sky principles.

During deliberations commissioners amended the draft ordinance to restore a provision allowing a temporary concrete batch plant to serve construction in the M3 district; the amendment passed unanimously. Commissioners also adopted an amendment intended to require that 10% of a data center’s energy usage be produced on‑site by renewable sources; staff said they would research legal and practical implications for an energy‑use requirement. A proposal to require natural‑gas‑fueled backup rather than diesel was discussed but staff declined to confirm immediately whether the commission could legally prescribe fuel type.

After debate the commission initially voted on a motion to recommend adoption of the amended ordinance and that motion failed on the first vote. The commission then moved to reconsider the decision; on reconsideration the commission approved a recommendation to City Council to adopt Ordinance 2‑66 as amended. The final recommendation carried by a narrow margin (roll call recorded 5–4). The Planning Commission’s action is advisory; the City Council will receive the commission’s recommendation and consider the ordinance at second reading.

The ordinance and its amendments explicitly reference state requirements for projects that seek the state tax incentives, such as procurement of clean energy and green building standards; staff noted the state enforcement mechanisms apply to those incentive conditions. Staff also told commissioners the city will not enter into a utility agreement until the ongoing aquifer and water‑system capacity study is completed.

What happens next: the Planning Commission’s recommendation will be transmitted to City Council for its consideration at the ordinance second reading. If the council proceeds under the same terms, any developer seeking to use the M3 district would still have to petition for rezoning (and, if the land lies outside city limits, negotiate annexation or a 425 agreement). If a property met the ordinance’s standards, staff explained, the city would be obligated to approve a rezoning unless the council made specific findings of fact to deny it.

Commissioners and staff encouraged further public engagement and additional technical research; several commissioners asked staff to return with clarifying language and legal analysis before Council action. The Planning Commission did not approve any specific development tonight — it approved a set of zoning standards the city can use when reviewing future proposals and recommended the ordinance to Council with the adopted amendments.