Updated: August 22, 2026 · Estimated read time: 6 minutes
Electricity prices can change because of fuel and supply costs, delivery infrastructure, regulatory decisions, weather and regional demand. Those changes are not identical for every Illinois utility, and no one can know exactly what a household's electricity will cost years from now.
Residential solar can reduce how much electricity a home purchases from the grid, which may reduce exposure to some future price changes. But the result depends on the utility, rate plan, system production, household usage, financing and current net-metering rules.
Why Electricity Costs Change
The U.S. Energy Information Administration publishes current residential electricity-price data by state. A statewide average is useful context, but it is not a substitute for reviewing your own utility bill because supply, delivery, riders, taxes and fixed charges can differ.
For a fuller Illinois explanation, read LuNova's guide to electricity bills and solar in 2026.
How Solar Can Reduce Grid Purchases
Solar panels produce electricity during daylight hours. Electricity used by the home as it is generated can reduce the amount purchased from the utility at that moment. Excess production may be exported under the billing rules that apply to the account.
Illinois net-metering treatment changed for many new Ameren Illinois, ComEd and MidAmerican customers beginning in 2025. LuNova's Illinois net-metering guide explains why self-consumption, system sizing and utility territory now matter even more.
What Solar Does Not Guarantee
- Solar does not guarantee a specific amount of savings.
- Solar does not eliminate every utility charge.
- Future utility rates and household usage cannot be predicted with certainty.
- A standard grid-connected solar system normally shuts down during an outage unless it includes equipment designed for backup operation.
The U.S. Department of Energy's homeowner guide recommends comparing your roof, usage, bids, ownership structure and financing before making a decision.
Ownership and Financing Matter
A cash purchase, solar loan and power purchase agreement create different obligations. A loan can add interest and fees. A PPA can include an electricity rate, annual escalator, transfer provisions and a long-term contract. Compare the full cost rather than relying on the first monthly payment.
Use LuNova's Illinois solar financing comparison and PPA guide to review those differences.
Backup Power Requires Separate Planning
Solar panels alone generally do not keep a home powered during a grid outage. Backup capability depends on the battery, inverter, electrical design, critical-load configuration and available stored energy. Review LuNova's Illinois solar battery guide before assuming that a proposed system will power an entire home.
A Better Question to Ask
Instead of asking whether solar will permanently “lock in” savings, ask how the proposed system performs under several reasonable scenarios:
- What happens if utility prices rise slowly, quickly or remain relatively flat?
- How much electricity is expected to be used directly versus exported?
- Which utility charges remain after solar?
- What are the total financing or PPA obligations?
- How do maintenance, warranties and future roof work affect the plan?
Check the Numbers for Your Home
LuNova Solar's preliminary estimator can help you begin with your electricity usage and property rather than a generic savings promise. Estimates are educational and should be verified against the final design, utility rules, contract and Illinois Shines disclosure.
Related Illinois Solar Guides
Sources & References
- U.S. Energy Information Administration — Electric Power Monthly — state electricity-price data
- U.S. Department of Energy — Homeowner's Guide to Solar — consumer planning and financing guidance
- Illinois Shines — Consumer Protection Resources — current Illinois disclosure and consumer-protection requirements