Why is my Ameren bill so high?

Ameren Illinois' Price to Compare — the supply portion of your bill — is 10.441¢ per kWh on the first 800 kWh a month and 8.262¢ on every kilowatt-hour beyond that, from October 1, 2026 through May 2027. It combines three parts: the electricity supply price, a 0.313¢ supply cost adjustment and a 2.765¢ transmission charge, which has applied since June 2026 and resets in January.

This guide covers the electric side of Ameren Illinois bills. Ameren Missouri and Ameren gas charges are priced separately.

The Price to Compare is a benchmark, not your whole bill. It covers only the electricity itself. Delivery charges, the fixed monthly charges and taxes are billed separately by Ameren no matter who supplies your power, which is why a supply-rate comparison never tells you what your bill will be.

One point worth stating plainly, because it is the source of a lot of misplaced anger: Ameren does not profit on the supply price. Default supply is procured under the Illinois Power Agency's plan and passed through to customers at cost. Ameren earns on delivery service. When the supply price rises, that is the wholesale market moving, not a margin decision. Both prices and the hourly option are laid out in Ameren Illinois rates.

Key numbers, October 2026

Next: every charge on an Ameren bill →

More lines than most people realise, and they reset on three different schedules. Supply changes twice a year, in June and October. Transmission changes each January and June. Delivery rates change each January. The table below is a residential DS-1 bill as of October 2026.

Two of those lines are worth understanding before anything else. The customer and meter charges total $14.51 a month and you pay them whether you use a single kilowatt-hour or none at all. And the distribution delivery charge is the line that behaves completely differently in summer — which is the next section. How a typical total compares across the state: the average electric bill in Illinois.

Next: the 800 kWh tier that vanishes in summer →

Ameren's residential rate steps down after 800 kWh — but only from October through May. In the summer months of June through September, both the supply rate and the distribution delivery rate are flat: every kilowatt-hour costs the same. The cheaper second tier simply is not there during the four months when air conditioning drives usage highest.

The effect is larger than most people expect. Take a household using 833 kWh in a month — roughly the 10,000 kWh a year Ameren describes as typical. At this winter's rates — October 2026 through May 2027 — that month costs about $139 before riders and taxes. At summer 2026 rates, the identical 833 kWh cost about $175.

Same house, same usage, roughly $36 more — driven entirely by which rates are in force. That is the honest answer to "why is my bill so high in summer." It is not only that you are using more. It is that you are using more at the exact moment the rate structure is least forgiving.

Next: estimate your own bill →

Enter your monthly usage and pick a season. This applies the 800 kWh tier correctly and shows the supply, delivery and fixed-charge split — the breakdown your bill does not lay out clearly. It runs in your browser and never asks for your name, address or account number.

Next: what you can actually do about it →

More than nothing, and less than the internet promises. Here are the real options, with what each is genuinely worth and what the catch is.

Be careful with alternative suppliers

This is the offer that arrives at the door and in the mail whenever prices spike, and the evidence on it is stark. Reviewing state data in August 2026, the Citizens Utility Board found Illinois consumers have lost about $2.3 billion to alternative electricity suppliers since 2015; the same review put ComEd and Ameren residential customers' losses at more than $206 million in the latest year, June 2025 to May 2026, with $128.6 million of it in Ameren territory.

“The numbers show that going with an alternative supplier can be a risky, financially painful gamble.”

Sarah Moskowitz, Executive Director, Citizens Utility Board, August 2025

That does not make every offer bad, but it means the burden of proof sits with the seller. Compare any offer against Ameren's current Price to Compare, read the term and the renewal language, and be sceptical of a teaser rate that resets. The same scepticism applies to solar quotes — how to tell if a solar quote is a good deal covers the checks that work on any offer, along with dealer fees hidden in solar loans and how to verify an installer. And if your town has negotiated a municipal aggregation deal, CUB's advice is not to assume it beats Ameren's price — confirm the rate and when the offer expires. A recent CUB analysis found most municipal aggregation deals were money-losers in Ameren territory.

Peak Time Rewards

Ameren pays a bill credit for each kilowatt-hour you cut below your own baseline during called events. The credit is reset each season from market prices and published in Ameren's Rider PTR schedule, which was revised effective October 16, 2026; summer credits can't fall below $0.10 per kWh. It is real money for shifting or pausing usage on a handful of days. The catch is that it only pays during events, and it is not a rate reduction.

Hourly or time-based pricing

Real Time Pricing and Power Smart Pricing charge you closer to what power actually costs hour by hour. These genuinely benefit households that can move heavy loads — laundry, dishwasher, EV charging, pool pumps — to overnight hours. They can also cost more in summer if your usage is concentrated in the afternoon, so they suit a specific kind of household rather than everyone.

Efficiency and assistance

Ameren's efficiency programme offers instant discounts including $125 off ENERGY STAR smart thermostats and $800 off heat-pump water heaters. On the assistance side, LIHEAP is open this program year to Ameren customers at or below 300% of the federal poverty guidelines, and Ameren's new Electric Service Discount, starting no later than the October 2026 billing period, aims to keep electric bills at 3% of monthly income for non-heating customers and 6% for heating customers, for households at or below 300% of the federal poverty level. LIHEAP recipients within that threshold qualify automatically.

LIHEAP applications opened October 1, 2026 for priority groups, such as seniors and families with young children. Everyone else can apply from November 1. The Help Illinois Families line is 1-833-711-0374. On October 14, 2026, Ameren also announced $10 million more for bill-help programs in Missouri and Illinois, including Warm Neighbors Cool Friends.

Battery and demand-response programmes

Ameren's Scheduled Dispatch Virtual Power Plant launches in 2027 and will pay customers who let Ameren dispatch a home battery during summer afternoons: weekdays from 4 to 6 p.m., June through September, at $10 per kW of output each summer, for at least five summers. It is also now tied to Ameren's battery rebate, which changes the calculation for anyone considering storage — the details, and what Ameren has and has not yet published, are on Ameren's virtual power plant explained. Whether a battery is worth adding at all, separate from any single program, is its own question: is a home battery worth it in Illinois? Every Illinois battery program is in one place on battery incentives in Illinois.

You may also have seen offers bundling a home battery, for a small fee or a refundable deposit, with a discounted electricity plan. Those exist in Illinois but are ComEd territory only as of August 2026 — we cover them on battery and supply bundles in Illinois if you want to understand the category, or if you are moving into ComEd territory.

Community solar

You can also subscribe to a share of a solar farm and get a credit on your bill. The Citizens Utility Board says community solar subscriptions “currently guarantee savings compared to the utility’s supply price.” Read the contract and its exit terms first.

Next: why Ameren’s price went up in the first place →

Capacity costs. Ameren sits in MISO, the grid operator covering central and southern Illinois, and MISO runs an auction that pays generators to be available when demand peaks. Those results feed straight into what Ameren pays for power, and then into your supply rate.

The scale of the move is the story. MISO's 2026/27 auction cleared summer capacity — June through August — at $424.30 per megawatt-day in the zones that include Illinois, roughly fourteen times the 2024 summer price of about $30. The year before was worse: the 2025/26 summer price hit a record $666.50 per megawatt-day, more than twenty times the prior year. Capacity is priced by season, and the rest of the 2026/27 year cleared far lower:

Here is the part that surprises people. Because $424.30 is lower than $666.50, summer 2026's supply rate came in below summer 2025's — 11.326¢ against 12.18¢. October runs the other way: the new non-summer price of 10.441¢ is about 24% above last October's 8.402¢, so the cheaper season is not as cheap as it was a year ago. Any page blaming this summer's rate on the $666.50 auction has the wrong year.

The underlying causes are not mysterious: electricity demand is growing, older generating plants are retiring, and the margin between available supply and peak demand has narrowed. Advocacy groups including the Citizens Utility Board also point to large new loads such as data centres as a driver — that is their assessment rather than a regulator's finding, and we flag it as such.

Next: how much more you’re paying →

For the months ahead, about 24% more than a year ago: the new non-summer price for the first 800 kWh is 10.441¢ against 8.402¢ last October — roughly $16 more a month on 800 kWh, on the supply line alone. Summer 2026 ran about 39% above summer 2024, which the Citizens Utility Board put at roughly $16 extra for every 500 kWh.

Over two years, the rise is bigger. This October’s 10.441¢ is about 29% above October 2024’s 8.090¢, the Citizens Utility Board notes.

Every ComEd and Ameren price change, as it happens: the Illinois electric rate tracker.

Delivery went up too, on a separate track. The Illinois Commerce Commission approved a $308.6 million multi-year delivery increase for Ameren in December 2024 covering 2024 through 2027, then a further $48 million reconciliation in December 2025 — less than the $59.6 million Ameren requested, after the Commission struck $11.2 million from the filing.

Next: did October’s price go down? →

From summer, yes. From last year, no. On October 1, 2026 Ameren's Price to Compare fell to 10.441¢ per kWh on the first 800 kWh a month and 8.262¢ beyond, about 8% below the summer's 11.326¢. But it is about 24% above last October's 8.402¢, which is why the Citizens Utility Board calls this a second year of the price spike.

One caution about reading a lower autumn number as relief: a bill is price multiplied by usage. A lower winter rate against higher winter usage can still produce a bigger bill, particularly in an all-electric home or one with electric backup heat. And the 800 kWh tier means the second half of a high-usage winter month is billed far more cheaply than the first — which is a genuine benefit of the non-summer structure. If you are weighing solar against winter bills, production drops in the darker months too: how solar performs through an Illinois winter.

Why is October’s price 24% higher than last year?

Most of the rise is in the supply part, up 1.383¢. Transmission added 0.501¢, up 22% since last October. Small adjustments added the rest. Above 800 kWh, supply barely moved, so most of that tier’s rise is transmission. MISO’s fall and spring capacity prices fell this year: fall went from $91.60 to $33.92 per megawatt-day. So the capacity auction doesn’t explain October’s rise.

Just want to know if solar is worth exploring? Jump to the solar section below.

Next: what changes in January →

January 2027 brings the next reset. The transmission part of Ameren’s price, delivery rates and several riders all change then. Two cases before state regulators could add more.

The Citizens Utility Board says Ameren’s $65.3 million request is about 5% more than regulators first approved for the year. CUB says it found at least $14.8 million in overcharges. It also wants more than $300 million cut from the $2.8 billion grid plan.

Next: is ComEd seeing the same thing? →

Same story, different market — and the numbers cannot be compared directly. ComEd sits in PJM, a separate grid operator with a completely different auction design. Both regions have hit record capacity prices for the same underlying reasons, but putting their dollar figures side by side would be misleading.

The difference is structural. MISO's auction is prompt — it procures capacity roughly one to two months before the year it covers, and clears seasonally and by zone. PJM's auction is forward, normally procuring about three years ahead on an annual basis, though its 2026/27 auction ran only about 10 months ahead and its 2027/28 auction about 18 months ahead. Different lead times, different products, different accreditation rules. A "$424 versus $329" comparison would look meaningful and mean nothing.

If you are on ComEd rather than Ameren, the equivalent explanation for your bill is on why is my ComEd bill so high, which covers PJM's auctions and ComEd's own delivery charges.

Next: does solar help with an Ameren bill? →

It changes a different variable than everything above. Switching suppliers or shifting usage changes the price you pay per kilowatt-hour. Solar changes how many kilowatt-hours you buy at whatever that price becomes. Whether that is worth the cost of the equipment depends entirely on your roof, your usage and your bill.

Two things are worth knowing in Ameren territory. First, for systems interconnected on or after January 1, 2025, Ameren credits both supply and transmission service for excess generation sent to the grid. ComEd's newer credits cover both too, so neither utility has the edge by design; the value tracks each one's own price. The mechanics are on Ameren net metering.

Second, Ameren pays a $300 per kW smart inverter rebate on residential solar and $300 per kWh on battery storage (from October 19, 2026, even without solar), which since June 1, 2026 requires enrolling the battery in Ameren's virtual power plant. Both rates are set through 2029. Ameren is also Group A in the Illinois Shines programme, which pays for the renewable energy credits your system produces. The full stack is on Illinois solar incentives 2026. Not sure what size system your usage actually needs? how many solar panels you need in Illinois covers the method.

What solar does not do is eliminate a bill. The fixed customer and meter charges of $14.51 a month continue regardless, and you still pay delivery on every kilowatt-hour you draw from the grid. We set out honestly what remains on what your bill looks like after solar, and what a system actually costs in Illinois on how much do solar panels cost in Illinois.

For the payback math at this October's rates, see is solar worth it in Illinois? — and in the Peoria area, solar panels in Peoria covers the local specifics. Weighing a lease or PPA instead of buying? Lease vs PPA vs buying, compared.

Next: quick answers to 17 questions →

Price to Compare

Ameren’s price for the electricity itself, plus transmission. Compare any supplier offer with this number.

kWh

A kilowatt-hour, the unit your usage is billed in. A typical Ameren home uses about 833 kWh a month.

800 kWh tier

From October through May, each kWh above 800 a month costs less. In summer, every kWh costs the same.

Distribution delivery

Ameren’s charge to carry power over its local lines. It’s billed no matter who supplies your power.

Transmission

The cost of moving power over high-voltage lines. It’s inside the Price to Compare and resets each January and June.

MISO capacity auction

A yearly auction run by the grid operator for central and southern Illinois. It pays power plants to be ready for peak demand.

Supply cost adjustment

A small add-on to the supply price that trues up Ameren’s actual costs.

Rider

An extra charge or credit set by its own tariff, like energy efficiency or renewable energy. Most riders reset in January.

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