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Indiana Solar Incentives (2026)

Indiana's Solar Incentives are more utility-driven than rebate-driven in 2026. Most homeowners and small businesses focus on three levers: (1) your utility's excess generation credit (often called EDG or net billing), (2) Indiana's property-tax deduction process for qualifying systems, and (3) smart system design so you use more of your solar power on-site.

Because policies and credit rates vary by utility territory, the most important first step is confirming which tariff applies to your meter (investor-owned utility, co-op, or municipal provider) and how exported power is credited.

What Solar Incentives are available in Indiana in 2026?

Utility bill credits for excess solar generation (EDG / net billing)

Indiana is best described as a net billing / excess distributed generation (EDG) state for most new customers. If your solar system produces more than you use in the moment, the extra electricity flows to the grid and you earn a credit on your bill—but the credit rate is typically not the full retail rate. For example, NIPSCO's EDG program describes credits based on 125% of market-priced power for excess distributed generation.

If you're in AES Indiana territory, you'll also see program language around "Excess Distributed Generation (EDG)" eligibility, interconnection, and credits.

Why it matters: in Indiana, payback is often improved by designing your system (and your energy habits) to use more solar power directly—especially midday—rather than exporting large surpluses at a discounted credit rate.

To compare the big-picture value of different incentive structures while you're reviewing your utility's tariff, it helps to reference incentives that can improve your ROI and then map those concepts to your Indiana bill credits.

"Grandfathered" net metering rules for older systems

Indiana passed legislation affecting net metering, and the Indiana Utility Regulatory Commission (IURC) has published resources and guidance tied to SEA 309 implementation and deadlines. If your system (or a property you're buying) is older, you may fall under legacy provisions rather than today's net billing approach.

Practical takeaway: if you're purchasing a home with solar, confirm whether the solar account is eligible to continue under the prior structure and how long that eligibility lasts.

Indiana property tax deduction for solar (Form 18865)

Indiana offers an environmental deduction that can reduce the assessed valuation attributable to a qualifying solar energy system (and some related technologies). The state's Department of Local Government Finance (DLGF) lists State Form 18865 for this purpose.

Many counties publish filing instructions; for example, county guidance commonly references filing with the County Auditor and includes annual deadlines.

What to do: after your Solar Installation is completed and your system is placed in service, ask your installer for the system details you'll need, then contact your County Auditor's office about Form 18865 procedures and timing.

Are there Indiana sales tax exemptions for residential solar?

You'll see conflicting claims online about sales tax exemptions. Indiana does have a sales-tax exemption statute for components of solar or wind energy systems in specific cases, but the statute language is tied to certain purchasers such as utilities/power subsidiaries and other qualifying sellers of electricity.

For most homeowners, the safer approach is: don't assume a point-of-sale sales tax break unless your installer can document eligibility under Indiana law for your exact transaction. When in doubt, treat sales tax savings as "nice if confirmed," not as guaranteed savings.

Get Free Solar Quotes

If you're trying to maximize Indiana Solar Incentives, comparing proposals matters as much as the incentive itself. Get Free Solar Quotes from multiple installers so you can compare system size, estimated production, how the design minimizes low-value exports, and how each quote handles interconnection paperwork.

How Indiana's utility programs can change your savings

NIPSCO: EDG credits and a separate feed-in tariff program

  • NIPSCO publishes an EDG program page describing how excess generation credits are calculated.
  • NIPSCO also maintains a feed-in tariff page (not the same as EDG) and notes that programs can be closed to new applicants depending on availability.

If you're in NIPSCO territory, you should confirm which option is actually open and applicable to your meter, system size, and customer class.

Indiana Michigan Power (I&M): rider and program documents

Indiana Michigan Power publishes net metering / distributed generation documentation (including customer information packets and tariff references) that spell out equipment limits, metering, and technical requirements.

AES Indiana: interconnection + eligible equipment standards

AES Indiana's solar FAQ explains that participating customers need an interconnection application/agreement, and it references standards like IEEE 1547-2018 and UL 1741 for inverter-based generation.

Solar Installation in Indiana: what to expect

A typical Solar Installation flow in Indiana looks like this:

You start with a site assessment and a proposed design sized to your annual usage and your utility's export credit rules. Then your installer completes engineering, permitting, and utility interconnection paperwork. After installation, the system is inspected and receives permission to operate (PTO). Only after PTO do you reliably start seeing bill credits under your utility program.

Because Indiana credit rates for exports can be lower than retail, good designs often emphasize daytime self-consumption—especially if you can shift loads (laundry, EV charging, water heating) to solar hours.

What are needed for solar installation in Indiana?

This is the checklist that most often affects eligibility, timelines, and whether you can fully use Indiana Solar Incentives:

  • Roof condition and shading: a roof near end-of-life can force a re-roof before solar; shading can reduce production and weaken the economics under net billing.
  • Electrical panel capacity: you may need a panel upgrade or service changes for safe interconnection (your utility and inspector will care about this).
  • Permits and inspections: local permitting is required, and inspections are typically needed before PTO.
  • Utility interconnection agreement: EDG/net billing participation commonly requires an interconnection application and signed agreement (utilities like AES Indiana explicitly describe this requirement).
  • Equipment basics: inverter-based systems should meet utility standards (AES Indiana references IEEE/UL requirements), and your quote should specify modules, inverter type, and monitoring.
  • Documentation for incentives: keep contracts, itemized invoices, PTO documentation, and system specs. For the property tax deduction, be prepared to coordinate with your County Auditor on Form 18865.

Solar Companies in Indiana: how to compare quotes without overpaying

When you're evaluating Solar Companies, Indiana's incentives make "design quality" especially important. Look for proposals that clearly explain:

  • How the system is sized to your usage (not just your roof area), how much power is expected to be exported vs. used on-site, and how the installer models bill credits under your utility's EDG/net billing tariff.
  • Ask whether they handle interconnection start-to-finish and what happens if PTO is delayed.

Also compare workmanship and equipment warranties, monitoring access, roof penetration methods, and the service plan for inverter or production issues.

Can you stack Indiana incentives with other home energy programs?

Indiana's Indiana Energy Saver Program focuses on energy efficiency and electrification upgrades (HOMES/HEAR), not solar PV—but it can complement solar if you're improving insulation, HVAC efficiency, or electrical readiness for electrification.

If you're doing both, sequence matters: efficiency upgrades can reduce your usage, which may change the ideal solar system size.

Solar Incentives by State

Explore state-specific solar incentives, net metering rules, tax credits, and rebates to maximize your savings on solar installation.

FAQ: Indiana Solar Incentives (2026)

Ready to compare Indiana Solar proposals?

Indiana savings can vary widely by utility territory and system design. Get Free Solar Quotes so you can compare production estimates, expected export credits under your utility tariff, warranty coverage, and the full interconnection plan before you commit.

Sources

Indiana Solar Incentives (2026): Tax Credits & Net Metering