Ohio's Attorney General certified a petition on March 16 to amend the state constitution and ban data centers at or above 25 megawatts. Statewide. No exceptions. No variance process. A hard cap written into the foundational legal document of a state that sits at the crossroads of multiple fiber backbone routes and cheap Appalachian Basin power.
This is a cooling story dressed as a land use fight.
Twenty-five megawatts is the threshold where data center cooling stops being a box on the roof and starts becoming industrial infrastructure. Evaporative towers. Chillers. Coolant distribution units. Condenser arrays pushing 85 to 95 dBA at the property line. The communities filing this petition are not reading white papers on PUE. They are hearing the fans. They are watching the water trucks. They are seeing their electric bills climb.
Commissioner Robert Wirkner announced the petition's certification at the March 30 Carroll County commissioners meeting. The grassroots effort is led by Austin Baurichter, a lawyer from Brown County who has organized opposition across rural Ohio communities facing data center proposals they did not ask for and cannot control under existing zoning frameworks.
The petition needs approximately 413,000 valid signatures from at least 44 of Ohio's 88 counties. Each county must contribute signatures equal to 5% of the votes cast in the most recent gubernatorial election. The deadline is July 2026 to place the amendment on the November ballot.
That is an aggressive timeline for a constitutional amendment. It is also not impossible. The organizers have momentum. The Village of Mount Orab already enacted its own moratorium on data center construction. Carroll County commissioners are publicly discussing the petition in official meetings. And the opposition's arguments map precisely to the complaints that drove 70% opposition to data centers in Wisconsin, where community backlash has already produced moratoriums and forced developers to pull proposals.
The pattern is spreading. Fast.
The petition's backers cite three categories of harm: electricity consumption, water depletion, and destruction of natural ecosystems. Those are the talking points. The lived experience is more specific.
A 50 MW data center running traditional air-cooled or evaporative cooling rejects somewhere between 120 and 170 million BTU per hour. That heat has to go somewhere. In a rural Ohio township, "somewhere" means cooling towers visible from the road, condenser noise audible from neighboring properties, and water withdrawal from aquifers that also feed wells and farms.
The noise issue alone generates opposition that no tax abatement can offset. Mechanical cooling equipment at scale produces 85 to 95 dBA at the source. Even with setbacks and sound walls, receptor-level noise at nearby residences can exceed county ordinance limits. Cooling towers drone. Condensers cycle. Emergency generators test. These are 24/7 facilities in communities that chose rural life for a reason.
Water is the second trigger. Evaporative cooling at 25 MW and above can consume hundreds of thousands of gallons per day depending on climate conditions and system design. Ohio is not Arizona. It gets rain. But local aquifer capacity is finite, and rural water districts do not have the infrastructure to supply industrial-scale cooling demand without capital investment that ratepayers end up funding.
AWS has plans for a data center in Clinton County that would generate over $1 million in annual tax revenue for the city of Wilmington. A million dollars a year sounds like a lot to a small Ohio city. It is. But the petition organizers are making a different calculation: permanent grid strain, water competition, noise, and visual impact in exchange for a facility that employs 30 to 50 people on an ongoing basis.
The Ohio Manufacturers Association has pushed back on claims that data centers drive up energy costs, arguing that utilities are inflating demand projections to justify rate increases. That distinction matters for industrial electricity pricing across the state. But it does not address the local impacts that are fueling the petition. A factory worker in Carroll County does not care whether the utility or the data center is technically responsible for her higher electric bill. She cares that it went up after the facility was announced.
This is the political math that cooling infrastructure decisions are shaping, whether operators realize it or not.
The petition drafters may not have chosen 25 MW because of its thermal engineering implications. But they landed on the exact number where cooling architecture becomes a community-facing issue.
Below 25 MW, most facilities can operate with packaged rooftop units, in-row cooling, or small dry coolers that produce minimal noise and consume no water. The footprint is modest. The thermal rejection is manageable within standard commercial zoning.
Above 25 MW, the math changes. Operators need centralized cooling plants. Chilled water loops. Cooling towers or large air-cooled condensers. The infrastructure footprint grows. Noise propagates. Water consumption scales linearly with IT load in evaporative systems. At 50 MW, you are running a small industrial cooling operation. At 100 MW, you are running a large one. At 500 MW, which is what hyperscalers are building across the Midwest, you are running something that fundamentally alters the resource balance of any rural county.
The petition is blunt. A constitutional cap at 25 MW would effectively ban hyperscale data centers from Ohio entirely. No phased development. No campus approach where individual buildings stay under the cap. The amendment, as described, targets the facility, not the building.
Here is what the thermal infrastructure industry should understand about Ohio. The petition may fail. Collecting 413,000 signatures across 44 counties in four months is a heavy lift. But the underlying opposition is real, growing, and replicable. Every state with rural data center proposals is one organized lawyer away from a similar effort.
The operators deploying liquid cooling, zero-water rejection systems, and low-noise dry coolers are building facilities that do not generate the complaints driving this petition. Direct liquid cooling at the chip level eliminates cooling towers entirely. Closed-loop dry coolers reject heat without water consumption and at noise levels 15 to 20 dBA below equivalent evaporative systems. Rear-door heat exchangers and in-rack CDUs keep thermal infrastructure inside the building envelope, invisible and inaudible from the property line.
The operators showing up in rural Ohio with banks of evaporative towers and 90 dBA condenser arrays are writing the opposition's campaign ads for them. Every gallon of water consumed, every decibel above background, every visible plume from a cooling tower becomes evidence in the next petition drive.
Ohio may not ban data centers above 25 MW. But the fact that the petition exists, that it got certified, that county commissioners are discussing it in public meetings, tells the cooling industry something it should already know. The communities hosting these facilities experience them as thermal infrastructure first. The noise comes from cooling. The water goes to cooling. The visual impact is cooling towers and condensers and pipe racks.
The vendors and operators who solve the community-facing thermal problem will operate in states where their competitors cannot. The ones who treat cooling architecture as a pure engineering optimization, ignoring its political dimension, will keep losing sites to constitutional amendments drafted by county lawyers with a petition and a deadline.