Solar power in Indiana has been growing in recent years due to new technological improvements and a variety of regulatory actions and financial incentives, particularly a 30% federal tax credit for any size project.
As of 2026, Indiana ranked 11th among U.S. states for installed solar power with 6.5 GW of photovoltaic panels, up from 18th place with 136 MW in 2015. The state nearly doubled its installed capacity in 2025, installing the third most capacity that year.
An estimated 18% of electricity in Indiana could be provided by rooftop solar panels.
A 17.5MW plant built at the Indianapolis airport in 2013 was the largest airport solar farm in the U.S. A 9MW solar farm was built at the Indianapolis Motor Speedway in 2014.
The Mammoth Solar project in Northwest Indiana broke ground in October 2021, and when complete it will be the largest solar project in the United States, with more than 2.8 million panels producing more than 1 gigawatt of power. The first 400 MW phase was completed in July 2024.
The Government of Indiana has taken a variety of actions in order to encourage solar energy use within the state.
The state eliminated its net metering program in 2022.
Indiana's Northern Indiana Public Service Company, NIPSCO, offers a feed-in tariff of $0.30/kWh for systems from 5 to 10 kW, and $0.26/kWh for systems from 10 kW to 2 MW. AES Indiana has a Renewable Energy Production program that pays $0.24/kWh for solar from 20 kW to 100 kW and $0.20/kWh for solar arrays of from 100 kW to 10 MW. Payments are for 15 years, participation is limited, and one third of the program, 45,900 MWh/year, will be made available through a reverse auction. No new applications will be accepted beyond March 2013.
The Indiana Office of Energy Development has created the Indiana Solar Energy Working Group to promote the development of solar energy, including local manufacturing.