TL;DR · 30-second read

The Short Version

Kentucky’s two biggest cities are drawing lines around the giant computer warehouses being built to run artificial intelligence.

Louisville proposed a size limit of 500,000 square feet, roughly nine football fields. Only three months earlier, the city approved one about 28 football fields big. Lexington stopped accepting new applications until October 31 after neighbors objected to plans to expand one.

Why it matters: city halls, not just tech companies, are now deciding how big these buildings can get and where they can go.

Kentucky’s two largest cities moved on June 9 to rein in hyperscale data centers, the Kentucky Lantern reported. Lexington’s Urban County Council suspended its legislative rules to impose a moratorium on data center applications through Oct. 31 while it writes zoning amendments. The same day, the Louisville Metro Planning Commission released a draft ordinance that would ban any data center larger than 500,000 square feet and restrict facilities over 250,000 square feet to industrial areas.

Louisville residents have 30 days to comment on the draft before it goes to Louisville Metro Council. In March, the same planning commission approved a 1.6 million-square-foot data center in West Louisville despite local opposition.

Executive Summary

Lexington and Louisville took different routes to the same goal on the same afternoon. Lexington hit pause: no new data center applications until Oct. 31, prompted by a developer’s purchase of a local data center property that it intends to expand. Louisville went straight to rules: a draft siting ordinance with a hard size ceiling of 500,000 square feet and industrial-only zoning for anything over 250,000 square feet.

The significance lies in the numbers. Louisville’s proposed ceiling is less than a third of the size of the facility the city approved three months earlier. For developers planning large AI campuses, that means the maximum scale of a project in Kentucky’s biggest city may be fixed by a planning document, regardless of what the grid or the supply chain could support.

Both cities cited resident concern. Lexington Mayor Linda Gorton said she supports “very tight controls” and that the city does not support public incentives for the developer seeking to expand.

A Ceiling Set Below a Third of March’s Approval

The number that carries this story is the gap between two Louisville decisions made three months apart. In March, the Louisville Metro Planning Commission approved a 1.6 million-square-foot data center in West Louisville over local objections. On June 9, the same commission released a draft ordinance that would ban any data center larger than 500,000 square feet, less than a third of that approved facility, and confine anything over 250,000 square feet to industrial zones.

This is how local zoning becomes a constraint on the scale of AI buildout. Hyperscale campuses, the very large facilities built for cloud and AI operators, draw much of their economic advantage from concentration: one site, one large electrical connection, one security perimeter, shared cooling infrastructure. A hard floor-area ceiling means a developer who wants that scale in Louisville would have to split it across buildings or sites, if the final ordinance allows that at all, or build somewhere else. In either case, the largest permissible project is being set by the planning code, independent of what power and equipment supply could support.

The effects fall on specific groups: developers and landowners holding Louisville sites, the local utility planning for large new electrical loads, and residents who opposed the March approval. Brian Davis, director of Louisville’s office of planning, described the goal as “clear, achievable standards that provide transparency and clarity for both residents and potential developers.” Clarity does have value for investors, since a known ceiling is easier to finance around than a case-by-case fight. But the ceiling sits well below the size of the projects that prompted it.

Two Cities, Two Tools: Pause Versus Rulebook

Lexington and Louisville used different instruments on the same day. Lexington’s council suspended its legislative rules to impose a moratorium through Oct. 31 while it drafts zoning amendments: pause first, rules later. Louisville, where a separate committee tabled a data center moratorium earlier in June, went straight to draft regulations and opened a 30-day public comment period before the ordinance reaches Metro Council.

For developers, the difference matters. A moratorium stops the clock entirely and leaves the eventual rules unknown. Lexington’s amendments could end in controls or, potentially, an outright ban. A draft ordinance keeps applications possible and tells the market roughly what it will face. Neither city has final rules today, and Lexington’s pause alone runs for nearly five months.

Lexington’s action was triggered by a single transaction, a developer buying an existing local data center property with plans to expand it. Council member Emma Curtis called it “a case of an issue being expedited because of constituent concern and advocacy.” That is a direct statement that resident objections, not a staff study, set the timetable. That is a legitimate part of local democracy. It also means the rules will be written with one specific project in view.

Square Feet Are a Blunt Proxy for the Grid

Mayor Gorton stated the concern most clearly: data centers “do not produce many jobs, and have the potential to increase utility costs on local residents.” Both points are common in these debates, and both deserve the same scrutiny applied to developers’ promises of economic benefit. Gorton did not attach figures to either claim. Whether a large facility actually raises household bills depends heavily on how the utility and state regulators assign the cost of new generation and transmission, and neither city’s action settles that question.

That exposes a limit in Louisville’s approach. Floor area is easy to measure and enforce, but it is only an indirect measure of what worries residents most: electricity demand. Servers built for AI draw far more power per rack than conventional cloud equipment, so two buildings of the same size can place very different loads on the grid. A 500,000-square-foot cap controls land use, traffic and physical footprint. It controls power draw only loosely.

For industry readers, the practical point is that Kentucky’s largest cities are regulating the most visible dimension of data centers first. Site selection now depends on local square-footage thresholds as well as power availability and land cost, and Louisville’s shift between March and June shows those thresholds can move within a single planning cycle.

Background

Kentucky has long hosted smaller data centers supporting services such as cloud storage. The wave of investment in artificial intelligence has brought a different class of facility nationwide: hyperscale data centers that can consume as much electricity as an entire power plant and can span millions of square feet.

Louisville has already experienced that shift. In March its Planning Commission approved a 1.6 million-square-foot data center in West Louisville despite local pushback, and earlier in June a separate city committee tabled a proposed data center moratorium. Lexington’s action followed a developer’s purchase of an existing local data center property with plans to expand it.

Sources

Source: Kentucky’s two largest cities take action to address concerns over hyperscale data centers (Kentucky Lantern), on Lexington’s data center moratorium and Louisville’s draft data center siting ordinance.