Understanding Energy Tiers

Here's a question that should bother you: does your county's zoning ordinance define what a "large-scale energy facility" is? Does it distinguish between a rooftop solar array and a 2,400-acre industrial solar farm? Between a single wind turbine on a ranch and a 400-turbine wind complex? If you live in most Idaho counties, the answer is no — and that's not an accident. It's how industrial energy gets built on farmland.

The Jerome County Energy Ordinance Reform Package proposes a three-tier classification system that solves this definitional gap. It isn't novel or experimental — it's built on definitions that already exist in federal code, FERC guidelines, and neighboring states' regulations. The question is why Idaho counties haven't adopted them yet.

The Definitional Vacuum

When Jerome County's zoning ordinance was last substantially updated, the terms "data center," "battery energy storage system," and "utility-scale solar" didn't appear in it at all. Energy projects were allowed in any zone — agricultural, residential, commercial, industrial — with no differentiation based on size, impact, or risk. A farmer installing panels on his barn roof and a corporation building a 25-megawatt solar farm on 160 acres of prime irrigated cropland were, in regulatory terms, the same thing.

This isn't just sloppy drafting. It's a structural vulnerability. Without clear definitions, a county has no legal basis to treat different projects differently. It can't require environmental impact assessments for large projects while fast-tracking small ones. It can't protect Class I and Class II agricultural soils while allowing development on less productive land. It can't scale notification requirements to project impact. And it can't require decommissioning bonds proportional to the cost of restoration.

What Other Counties Got Wrong

Look at how other Idaho counties have handled — or failed to handle — the definition problem.

Twin Falls County's draft ordinance comes closer — it distinguishes between personal-use systems (under 200 kW) and large-scale projects, requires conditional use permits, and protects prime farmland. But it still has only two categories where three are needed, and its notification radius of 300 feet is woefully inadequate for a facility whose impacts extend miles.

Gooding County, writing its energy ordinance from scratch, has adopted a similar structure to Twin Falls with personal-use and on-site-use categories — but again, no third tier for true industrial-scale development. Without that distinction, a 5 MW community solar project and a 500 MW data center go through the same process.

Why the Thresholds Matter

The specific numbers in the three-tier system — 50 kW, 25 MW, 2 acres, 160 acres — aren't arbitrary. They're drawn from federal energy regulatory definitions, USDA acreage classifications, and Idaho state code. The 50 kW threshold aligns with the upper bound of residential and small commercial installations. The 25 MW threshold marks the boundary where FERC considers a facility to be utility-scale. The 160-acre threshold corresponds to a quarter-section — the basic unit of agricultural land in the western states and the maximum size of many family farm operations in Jerome County.

These aren't just numbers on paper. They're the boundary markers between "my neighbor put up solar panels" and "a corporation from out of state turned 160 acres of wheat field into an industrial site." The reform package argues — correctly — that the regulatory response to those two scenarios should be fundamentally different.