Solar in Indiana: how the rules work
How Indiana credits the power solar panels send back to the grid, what homes there pay for electricity, and what to check when a home with solar is bought or sold.
How exported power is credited
Power sent to the grid is credited at an export rate well below retail, often tied to the utility’s avoided cost.
SEA 309 (2017) replaced net metering with Excess Distributed Generation (EDG) for new customers. Duke Energy Indiana's EDG tariff was approved by the IURC in Cause No. 45508, over OUCC opposition. EDG measures excess instantaneously, i.e. every kWh that flows out of the meter. Self-consumed solar offsets retail. Exported kWh are credited at 1.25 times the utility's prior-year weighted average marginal (wholesale/LMP) price, a rate that changes annually. Third-party guides put Indiana EDG credits for Duke, AES, CenterPoint and I&M at roughly 3-5 cents/kWh (AES ~3.9 cents), against ~14-16 cents residential retail. A Duke-specific current number was not found in a primary source. The Indiana Supreme Court upheld instantaneous netting in 2024. Grandfathering: systems installed before January 1, 2018 keep 1:1 net metering until July 1, 2047, and systems installed from 2018 until the utility's EDG start (by July 1, 2022) keep it until July 1, 2032. No solar-specific monthly fee was identified. Share basis: ~4 cents vs ~15 cents.
What changes for a home with solar
A savings estimate that assumes full retail credit for exported power overstates the value of that power for systems on the current rules. Power used in the home still offsets the full retail rate.
Older systems are often grandfathered on earlier, better terms for a set number of years. Which rules a particular system is on depends on its interconnection date, stated in the note above.
Electricity here costs about 17.0¢ per kWh (2026) and has risen about 2.6% a year over the last decade. A lease or PPA escalator above that pace makes the solar payment rise faster than utility rates have.
When a home with solar is sold in Indiana
- Owned outright: proof it is paid off, the warranties, and the utility’s interconnection or net-metering agreement, which has to move into the buyer’s name.
- Loan: a payoff letter, and whether the buyer can assume the loan. Many solar loans are secured by a UCC-1 fixture filing that title will find.
- Lease or PPA: the transfer process and how long approval takes, the buyer’s credit check, the current payment or rate and its yearly increase, and a buyout quote.
- Every case: whether the export-credit terms above stay with the home after the sale, and the last 12 months of production from the monitoring app.
Have the solar contract for a Indiana home?
Upload it and get a letter-graded report card: price, production, payment changes, value and transfer terms, measured against Indiana’s rates and rules.
Grade a solar contractSources
- www.in.gov/oucc/electric/key-cases-by-utility/duke-energy-rates/duke-energy-distributed-ge
- extension.purdue.edu/cdext/thematic-areas/community-planning/collaborative-projects/rstep/ (2025-04)
- indianasolarquotes.com/indiana-net-metering-edg/
- palmetto.com/local/indiana/ (2026)
- Electricity prices: EIA Electric Power Monthly, Table 5.6.B (2026) and EIA state annual averages 2014–2024
- Installed price: EnergySage marketplace, September 2026