Buying Solar vs a Solar PPA in Illinois: An Honest Comparison

When people start looking at solar in Illinois, they usually run into two paths. You can buy a system and own it, or you can use a power purchase agreement, often called a PPA. Both can be good choices. The right one depends on you, not on a sales pitch.

Buying and owning your system

When you buy, you pay for the system once, with cash or a loan, and it belongs to you. The power it makes offsets the power you would otherwise buy from the utility. Over the long life of the equipment, ownership usually offers the lowest lifetime cost and the most control, and it can add value to your home.

One honest update for 2026. The 30 percent federal residential tax credit that buyers used to claim ended for systems placed in service after December 31, 2025. So a homeowner who buys today generally cannot count on that credit anymore. Illinois Shines, which pays for the renewable energy credits your system produces, can still help, and the owner is usually the one who benefits. Tax situations vary, so confirm anything tax related with a licensed professional.

Going solar with a PPA

In a PPA, a third-party company owns and maintains the panels on your roof. You agree to buy the power they produce, often with little or no money down. Maintenance and repairs are typically their responsibility. Because the company owns the system, it may be able to use a federal commercial credit, which can help keep your rate competitive.

The tradeoffs are real. Many PPAs include an annual price increase called an escalator, so ask what your rate will be in later years. You also do not build equity, since you do not own the system. And when you sell your home, the buyer usually needs to take over the agreement, so understand the transfer terms before you sign.

What both paths share in Illinois

• Since January 1, 2025, new solar customers are on net billing, so exported energy is credited at the supply rate, not the full retail rate.
• Proper system sizing matters more than ever, because using your own power on-site is worth more than exporting it.
• An honest estimate should be built on today's rules, not on incentives that have expired.

There is no universal right answer here, only the right answer for your home and your budget. If you want, I will run both options side by side using your actual electric bill, free and with no pressure, so you can decide for yourself.