How Big Industrial Projects Move Through Planning

Most zoning codes were written for houses, stores, farms and the occasional factory. Then someone shows up wanting 200 acres for a building that draws as much power as a small city, runs around the clock, and keeps a row of diesel generators out back. Every tool from the earlier lessons gets used at once. This lesson walks through how, keeping it general. A separate data center planning course in this series covers that industry in depth, and the Data Centers in Your Community course covers power, water and money.

When the use table is silent

Search a typical Idaho county code for "data center" and you will probably find nothing. The tax code has a definition: Idaho Code 63-3622VV describes a data center as one or more buildings housing server equipment, with uninterruptible power supplies or generator power, sophisticated fire suppression, and enhanced physical security. Zoning ordinances often have no such entry. A project then has four main routes:

Route	What happens	Character	Public hearing?
Staff interpretation	The planning director decides the use is "similar to" a listed one, such as warehouse or manufacturing	Administrative	Often none, unless appealed
Text amendment	The board adds the use to the table, with standards, in chosen zones	Legislative	Yes, under 67-6509
Rezone, often with a plan amendment	Agricultural land becomes industrial, frequently with a development agreement	Quasi-judicial for a site-specific rezone	Yes
Conditional use permit	The use is conditional in the zone, and the board attaches conditions	Quasi-judicial	Yes, under 67-6512

Many codes include a clause letting staff classify an unlisted use. Find yours, and find out whether that interpretation can be appealed and by whom. A data center called a "warehouse" may be allowed outright in an industrial zone with no hearing at all, which surprises neighbors who expected one.

When a board thinks its code is not ready, it can pause. Idaho Code 67-6523 allows an emergency moratorium on selected permits for up to 182 days, with written findings of imminent peril, and no back-to-back renewals. Section 67-6524 allows an interim moratorium of up to one calendar year, again with written findings, while a plan or plan amendment is being prepared. The Attorney General's takings guidelines warn that moratoriums need those written findings to hold up.

A real Idaho example

One large industrial rezone that reached the Idaho Supreme Court involved a power plant rather than a data center, and it followed the same path. Alternate Energy Holdings contracted for about 5,000 acres in Payette County in 2009 for a proposed nuclear plant. It applied to amend the county plan from agricultural to industrial and to rezone about 500 acres from agricultural to I-2 heavy industrial, with a development agreement. The county amended its plan to add language on energy facility siting, approved the conditional rezone, and kept thousands of surrounding acres in agricultural zoning as a buffer. In 2015 the Supreme Court upheld all of it: the plan, the rezone against a spot zoning claim, and the notice process. The case is a useful template for how a county can move a large project through LLUPA.

Water: a 2026 change that moves the map

In 2026 the Legislature passed House Bill 895, adding Idaho Code 42-252. Data centers, as defined in the tax code, that begin construction on or after July 1, 2026 may not use water for cooling as a consumptive use unless the water comes from a municipal, water district, or water and sewer district system. The bill's findings declare that data center water use conflicts with the local public interest and is contrary to conservation of water resources for purposes of the state's water right permit and transfer statutes, and tell the Department of Water Resources director to consider those findings.

That is water law, administered by the state. It has a planning consequence anyway. A project that wants evaporative cooling now has to buy water from a city or a public water system. That pulls projects toward cities and their utilities, which brings in annexation (lesson 6), city zoning, and the city's own capacity to serve. Projects that use closed-loop or air cooling may still look at rural sites. Ask which kind of cooling a project plans before you say anything about its water.

Conditions that matter

Under 67-6512(d), a board can attach conditions minimizing impacts, controlling timing and duration, setting exact locations, requiring facilities and imposing stricter standards. For a large industrial project, the fights usually come down to a short list. A condition is only useful if it is measurable and someone checks it.

Issue	Vague condition	Enforceable condition
Noise	Operations shall not be excessively loud	Not to exceed 50 dBA daytime and 45 dBA from 10 p.m. to 7 a.m. at any residential property line, verified by a third-party study at startup and annually
Backup generators	Generators used only as needed	Testing limited to weekdays, 9 a.m. to 4 p.m., one unit at a time; logs of every run hour provided to the county quarterly
Water	Adequate water shall be provided	Will-serve letter from the city before building permit; cooling method stated in the permit; annual water use reported
Setbacks and buffers	Appropriate buffering	Buildings at least 500 feet from residential zones; 30-foot berm with evergreen screening on the north and east lines, planted before occupancy
Lighting	Lighting shall be reasonable	Fully shielded, downward fixtures; no light trespass over 0.1 foot-candle at the property line
Construction traffic	Minimize traffic	Haul route designated; road repair bond posted with the highway district
Decommissioning	None	Removal plan and bond if the facility is idle for a set period

The numbers in the right column are illustrations. They are not recommendations. Each one has to fit the local ordinance and the evidence in the record. And conditions requiring land, easements or money still need the nexus and rough proportionality the takings checklist describes.

Generators sit at the edge of county power. Federal rules in 40 CFR 60.4211(f) let emergency stationary engines run without limit in real emergencies and up to 100 hours a year for maintenance and readiness testing, with up to 50 hours of certain non-emergency operation counted inside that 100. Air permits come from state and federal regulators. Idaho Code 67-6522 says local ordinances cannot abrogate the statutory authority of a public health district or state or federal agency. A county can still set land use conditions like testing hours, fuel storage location and setbacks.

The arguments, fairly

Property rights and development view	Neighbor and planning view
An owner of industrial or farm land should be able to sell to the highest bidder and put land to productive use	A use this large affects roads, water, power and quiet far beyond its fence line
Large projects bring construction jobs, permanent jobs and property tax base	Permanent jobs at some facilities are few relative to land and utility use, and tax incentives can shrink the base
Conditions and development agreements can manage impacts without saying no	Conditions only work if they are measurable and enforced, and many counties have little enforcement staff
Moratoriums and vague standards create uncertainty and can raise takings issues	A short, findings-based pause lets the county write clear standards before the first application sets the precedent

Both columns contain claims that can be tested with numbers from the application, the assessor and the utility. Check them before you repeat them in testimony, at a meeting or online.