Springfield IL Electricity Choice: Comparing Supply Rates in Ameren Illinois Territory
Springfield addresses served by Ameren Illinois can shop the supply portion of the bill from any Alternative Retail Electric Supplier certified in Illinois. Ameren keeps the wires, the meter and the outage number at 800-755-5000.
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Switch Both Electric + Gas in Springfield — Save $140+/year
Springfield is in a dual fuel deregulated state. You can switch both your electricity AND natural gas provider. Most customers who switch both save $140 or more per year.
About Energy Choice in Springfield
Ameren Illinois covers roughly 1.2 million electric customers across central and southern Illinois, and Springfield sits squarely in its footprint. Ameren is the delivery utility — it owns the substations and lines that reach every Ameren-served Springfield address — and Illinois's deregulation law separates that delivery role from the supply charge you can shop.
Ameren's version of the default supply rate is called the Price to Compare (PTC), the same terminology ComEd uses but with different numbers because Ameren buys power on separate MISO wholesale markets rather than on PJM. That distinction matters for Springfield: MISO capacity and energy prices don't always track PJM's, so an Ameren PTC can move in the opposite direction from ComEd's in any given cycle. Compare against Ameren's PTC, not a Chicago-area headline.
A quirk local to Springfield is that portions of the city are historically served by the municipal utility City Water, Light & Power (CWLP) rather than Ameren. Municipal service is not part of the Illinois retail choice program, and CWLP customers cannot shop. Check the utility name on your most recent bill — if it says Ameren Illinois, you can shop; if it says CWLP, the plans on this page won't apply.
For Ameren-served Springfield households, the practical shopping question is contract length. Ameren's PTC resets on a different schedule than ComEd's, so a fixed 12-month contract signed in late summer typically covers one full winter and one full summer inside a single rate — the exposure profile the Illinois Commerce Commission built the program around.
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Frequently Asked Questions
Who is my electric utility in Springfield, Illinois?
Most Springfield addresses are served by Ameren Illinois, which covers central and southern Illinois including Springfield, Peoria, Champaign and East St. Louis. Some Springfield addresses take service from the municipal utility City Water, Light & Power (CWLP) instead — that portion of the city is not part of the deregulated market.
How is Ameren Illinois different from ComEd for shopping purposes?
Ameren Illinois buys wholesale power on MISO while ComEd is on PJM. The Price to Compare is set separately for each utility, so Ameren's default rate can be higher or lower than ComEd's in the same month. Suppliers file separate offers for Ameren Illinois territory.
Does switching suppliers affect Ameren outage response in Springfield?
No. Ameren Illinois handles all outage restoration in its territory, including Springfield. The outage line is 800-755-5000 for every Ameren customer, whether they shop or stay on the Price to Compare.
Will my Ameren Illinois bill look different after I switch?
Ameren still sends one consolidated bill. The 'electric supply' section lists your new supplier's name and rate; delivery, riders and taxes stay on Ameren's side of the bill and don't change.
How do I confirm I'm eligible to shop in Springfield?
Look at the top of your most recent electric bill. If Ameren Illinois is listed as the utility, you can enroll with any ARES certified by the Illinois Commerce Commission. If City Water, Light & Power is listed, your service is municipal and not shoppable.