Utility-scale solar has become one of the fastest-growing land uses in rural Indiana, and it drags a two-part property tax system along with it. The land under the panels is real property, valued under a special statewide cap. The panels, inverters, and turbines are utility personal property that depreciates on a schedule — and after the 2025 legislative session, that schedule now runs toward zero. If you lease ground to a developer, farm next to a project, or sit on a county council counting on the new tax base, the mechanics matter.
The Two Halves of a Renewable Project's Tax Bill
Indiana treats a solar or wind project as two distinct taxable things:
- The land — locally assessed real property. For utility-grade solar, the assessed value of the land under the arrays is capped by a regional solar land base rate the DLGF publishes each year under IC 6-1.1-8-24.5.
- The equipment — panels, racking, inverters, turbines. Because a "utility-grade solar energy installation facility" is defined as a light, heat, or power company under IC 6-1.1-8 (a change made by HEA 1348-2021), the equipment is assessed through the utility personal property system based on original cost, then depreciated using federal tax depreciation.
Early in a project's life, equipment dominates the tax bill. Late in a project's life, the land is most of what is left.
The Solar Land Base Rate: A Cap, Not a Price
Under IC 6-1.1-8-24, the township or county assessor must value the land underneath the fixed property of a utility-grade solar facility at an amount that does not exceed the solar land base rate for the region. The rate covers the land under the panels plus the land between and immediately surrounding them, coded with Land Type Code 84 on the property record.
Each year the DLGF calculates the rate for three regions — North, Central, and South — as the median true tax value per acre of land classified under the 800-series utility property class codes in that region for the preceding year. Marion County and the Indianapolis donut counties sit in the Central region.
The 2026 rates (and a mid-year plot twist)
The DLGF first issued 2026 rates in November 2025, then revised them on March 20, 2026 after HEA 1210-2026 — signed March 13, 2026 — retroactively changed the calculation method back by removing an exclusion HEA 1427-2025 had added. The revised rates for the January 1, 2026 assessment date:
| Region | Jan 1, 2025 assessment | Jan 1, 2026 assessment (revised) |
|---|---|---|
| North | $13,700/acre | $13,000/acre |
| Central | $13,726/acre | $14,607/acre |
| South | $7,701/acre | $7,699/acre |
For comparison, the DLGF certified the statewide agricultural land base rate at $2,120 per acre for the same January 1, 2026 assessment date (before soil productivity and influence factor adjustments). Converting farmland to solar can therefore multiply the land's assessed value roughly five to seven times — and that is before any equipment value. If you farm ground that stayed in agriculture, the mechanics of that rate are covered in our guide to 2026 farmland base rate appeal tactics.
Note
The base rate is a ceiling, not a mandate. An assessor may value solar land below the regional cap, and facilities that were already assessed on the January 1, 2021 assessment date have a limited carve-out that holds their value until the county's next cyclical reassessment if it sits below the base rate.
Equipment: Fast Depreciation, Fading Revenue
The expensive part of a solar or wind project is the equipment, and Indiana taxes it as utility personal property: the owner self-reports historical cost, the value is depreciated under federal tax depreciation, and a gross additions deduction of 60 percent applies in the first year distributable equipment is placed in service.
Two recent changes reshaped this math:
- SEA 1-2025 eliminated the 30 percent depreciation floor for depreciable personal property acquired after January 1, 2025, except for property in TIF allocation areas established before 2025. Previously, equipment could never be taxed below 30 percent of its original cost. Now it can depreciate all the way down.
- Solar and wind equipment follows a five-year federal depreciation class. A University of Michigan Graham Institute analysis of Indiana renewable taxation concluded that for post-2025 projects outside legacy TIF areas, equipment value effectively runs off over that five-year window, "after which the only property tax revenue for such projects will come from the underlying land."
The same analysis estimated a 100 MW Indiana solar project at roughly $1 per watt of installed cost, about 95 percent of it personal property, producing an assessed value around $40.1 million in an average operating year under pre-SEA 1 rules — against roughly $1.1 million for the same 700 acres as farmland. Under the new rules, the equipment component shrinks toward zero much faster, leaving the capped land value as the durable tax base.
One thing the equipment does not get: the new $2 million business personal property exemption that takes effect with the 2026 assessment date applies to ordinary business filers, not to utility property assessed through the state distributable system. We break that change down in our post on the $2M business personal property exemption.
Wind and Battery Storage Are Different
Wind does not use the solar land base rate. State guidance classifies the small footprint under each turbine — typically a quarter to half an acre — as industrial land assessed at market value, while the surrounding ground that stays in production continues to be assessed as farmland. That keeps far more of a wind project's acreage on the agricultural schedule than a solar project of the same capacity.
Battery storage has no published land base rate at all. The statutory cap is defined for a "utility-grade solar energy installation facility" generating electricity for resale, and the DLGF has issued no equivalent memo for standalone storage sites — so that land is valued under ordinary commercial/industrial rules while the batteries fall under the same cost-and-depreciation personal property framework. Large single-taxpayer facilities raise the same concentration questions we explored for data center assessments and the LEAP district.
Warning
Homeowners: the residential incentives are gone. SEA 1-2025 eliminated the deductions for solar energy heating or cooling systems (IC 6-1.1-12-26), solar power devices (IC 6-1.1-12-26.1), wind, hydroelectric, and geothermal devices, retroactive to the January 1, 2025 assessment date — so they no longer appear on 2025-pay-2026 bills. Per DLGF guidance, removing the deduction should not change your gross assessed value, but the offset that used to shelter the system's value is no longer applied.
What This Means on the Ground
For landowners leasing to developers: once panels go up, your parcel is reclassified into the 800-series utility codes and the land value jumps to (at most) the regional cap. Most solar leases shift property taxes to the developer, but the assessment lands on your parcel — check the record card each year, because acreage outside the fence line should not be swept into utility classification.
For neighbors: a project adds tens of millions in assessed value early on. Whether that lowers your rate depends on how taxing units respond to maximum levy limits — added AV can spread the levy across a bigger base, but the benefit fades as equipment depreciates out.
For counties: the revenue curve is front-loaded. Equipment value arrives fast, takes the 60 percent first-year haircut, then runs off over roughly five years, leaving capped land value. Counties banking on renewable AV should model the decade, not year three.
Check Your Own Numbers
Whether you own the ground under a project, farm beside one, or saw your assessment move in a township with new utility AV, start with the data. Our Indiana property explorer shows parcel-level assessed values and classifications statewide, and the property lookup tool surfaces your record card details and comparable evidence. If your land was misclassified, valued above the regional cap, or trended past what the market supports, our tax appeal service builds the evidence package and files for you. Owners of unimproved ground near project sites should also review how vacant land is assessed in 2026 — speculative pressure from energy development is a common source of overshoot.
The authoritative sources are the DLGF's revised 2026 Solar Land Base Rates memo and the Graham Institute's Indiana renewable property tax analysis.