Rules by state

Solar and battery interconnection rules in Indiana

Indiana interconnection (170 IAC 4-4.3). Every threshold below was read out of the document linked at the bottom of this page, and the same rules answer the free screening check.

Who this binds: investor owned utilities. A utility outside that list sets its own terms, so confirm who serves the address first.

Check a Indiana address free
How the size is measured: not published

The published limits here are stated in kilowatts without saying whether that is the inverter rating in alternating current or the array rating in direct current. On a system near a threshold that decides which band it lands in, so the checker asks the question rather than choosing an answer.

Size bands and what each one obliges

Level 1 Size 0 to 10 kW

An inverter based facility with a nameplate capacity of ten kilowatts or less using certified equipment. Indiana publishes no application fee and no insurance requirement in the interconnection rule.

  • Certified inverter based equipment
  • No fee or insurance published in the rule
Level 2 Size 10.001 to 2000 kW

A nameplate capacity of two megawatts or less using certified equipment. For any additional review the utility must provide a nonbinding good faith estimate of the costs; no fixed schedule is published.

  • Certified equipment
  • Good faith cost estimate for additional review
Level 3 Size 2000.001 kW and above

Facilities on the distribution system that do not meet Level 1 or Level 2. No published ceiling.

  • Good faith cost estimate for studies

The screens that decide it

Ask the utility this, before you sell it

  1. Is the nameplate capacity measured in alternating or direct current? Indiana publishes a threshold with no unit stated, and on a system near ten kilowatts it decides the review level.
  2. This customer is not eligible for net metering, which closed to new installations under Senate Enrolled Act 309. What is the current excess distributed generation credit rate?
  3. Is this address served by a municipal utility or a rural electric membership corporation? Neither is an investor owned utility under this rule.

Worth knowing before you quote

Indiana publishes no application fee, no study deposit and no insurance requirement in the sections read, and has the thinnest treatment of storage of any state in the region: no storage tier, no export limiting and no non export mode. Level 1 completeness is ten business days and the decision follows within fifteen business days, with the agreement within ten business days and the customer returning it at least ten business days before starting operation.

Source

Indiana Administrative Code 170 IAC 4-4.3, interconnection, with net metering at 170 IAC 4-4.2

Read and recorded 2026-09-12. Binds investor owned electric utilities, defined as public utilities financed by the sale of securities whose operations are overseen by a shareholder board. Municipal utilities and rural electric membership corporations are outside that definition, though the rule contains no express exclusion sentence and in fact has no applicability section at all. Net metering closed to new customers under Senate Enrolled Act 309.

What to do with this

Check a real address

The rules below are the general case. Run the free check to see which utility serves a specific address, which tier the system lands in, and what to ask.

Run the free check
Installers: keep the answer with the job

GridProjeX holds the project from here, with every value tied to the document it came from and the utility and permit tracks run to permission to operate.

How it works for installers
Utilities: see what applicants are told

The same published rules your applicants read here are the ones your queue sees. GridProjeX is the record both sides work from.

How it works for utilities

Also from CivyxIQ, if they fit what you already do: SolarProjeX for running the crews and the jobs, and Solar Home so the homeowner can follow their own project. Neither is needed to use the checker.