analysis8 min read

The Iran War Is Sending Oil Prices Through the Roof — Will Your Illinois Electric Bill Follow?

Ryan Cook•April 4, 2026•Updated Sep 13, 2026

Five weeks ago, the United States and Israel launched strikes on Iran. Since then, the Strait of Hormuz — the narrow waterway that carries 20% of the world's oil — has been effectively shut down. Maritime traffic through the strait has dropped 98%. Oil prices have surged to $112 a barrel. Gas at the pump just crossed $4 for the first time since 2022.

If you're an Illinois homeowner watching all of this unfold and wondering what it means for your electric bill, here's the honest answer: it's complicated, but the short version is that Illinois is better positioned than most states — for now. The problem is that "for now" has an expiration date, and it's coming fast.

Brent crude oil price timeline showing the spike from $72 to $112 per barrel over 5 weeks of the Iran conflict

How Oil Prices Connect to Your Electric Bill

Most people assume that expensive oil automatically means expensive electricity. That's not exactly how it works.

Illinois power plants don't burn oil. They burn natural gas, split atoms, shovel coal, and catch wind. The generation mix looks like this:

Source	Share of IL Electricity
Nuclear	53%
Natural gas	17%
Coal	14%
Wind	13%
Solar & other	3%

Illinois electricity generation mix donut chart showing 53% nuclear, 17% natural gas, 14% coal, 13% wind, 3% solar and other

That 53% nuclear number is a big deal. Nuclear plants buy fuel rods that last years — they don't care what oil costs this week. Illinois has six nuclear plants with eleven reactors, more than any other state. That's a massive buffer against exactly this kind of geopolitical shock.

The vulnerability is in that 17% natural gas slice. Natural gas and oil prices are correlated — when one moves, the other tends to follow. And natural gas is the "swing fuel" that sets the price of electricity on the margin. Even though it's only 17% of generation, it often determines what you pay.

What's Actually Happening to Natural Gas

Here's where it gets interesting. US domestic natural gas prices have stayed surprisingly stable — Henry Hub is around $3.05/MMBtu in early April, compared to $2.94 in March. That's because the US produces most of its own natural gas domestically. We're not importing it through the Strait of Hormuz.

But global LNG is a different story. European gas prices have nearly doubled. Asian spot prices are up over 140% since Iran's IRGC attacked Qatar's Ras Laffan facility on March 18, damaging two of fourteen liquefaction trains at the world's largest LNG export terminal. Qatar produces 20% of global LNG, and some of that capacity will take years to rebuild regardless of when the war ends.

Why does global LNG matter for Illinois? Because US LNG export terminals now consume more natural gas than all 74 million American households combined. As global prices stay elevated, exporters bid up domestic supply. That pressure hasn't fully hit yet — but Brookings warns that "the Iran conflict's energy shocks are not yet fully realized."

Illinois Rates Were Already Climbing Before the War

Here's the part that doesn't get enough attention: the Iran conflict is landing on top of rate increases that were already baked in.

ComEd customers are currently paying about 10.399 cents/kWh for supply this summer — and even the January 2026 non-summer price of 9.66¢/kWh was up 47% from January 2025. The ICC approved a $243 million delivery rate hike effective January 2026. And a new capacity charge kicked in June 2026 based on PJM's record-breaking auction price of $329.17/MW-day. CUB is warning that rates will stay elevated "for at least the next few years."

Updated September 2, 2026: 10.8¢ was the April 2026 ComEd supply figure; the current ComEd Price to Compare is 10.399¢/kWh, effective June 1 through September 30, 2026, per the Illinois Commerce Commission.

Ameren Illinois customers are paying about 15.5 cents/kWh all-in — up 94% since 2021. During summer months, all-in rates hit roughly 20 cents/kWh. MISO's capacity auction saw summer prices jump from $30 to $666.50/MW-day in a single year.

The biggest driver of these increases isn't the war — it's data centers. They now consume 5.43% of all Illinois electricity, and PJM's Independent Market Monitor found that 70% of last year's capacity cost spike — $9.3 billion — came from data center demand.

So when people ask "will the Iran war raise my electric bill?" — the honest answer is that your bill was already going up. The war just adds another layer of risk on top.

Bar chart comparing Illinois electricity rates from 2021 to April 2026 to projected summer 2026 for both ComEd and Ameren

The June 2026 Rate Reset Is the Real Danger

Illinois utilities set supply rates through periodic procurement auctions. The next major reset happens in June 2026. If the Strait of Hormuz is still blockaded when those auctions happen — and as of today, Trump has given Iran until April 6 to reopen it or face strikes on Iranian bridges and power plants — then elevated natural gas futures will get baked into the rates you pay for the next six to twelve months.

That's the mechanism. It's not that your power plant burns oil. It's that the auctions where your utility buys wholesale electricity will reflect a world where energy is more expensive everywhere, and the bidders know it.

Analyst projections on how bad it could get:

Goldman Sachs (3-week conflict): gas peaks at $4.36/gallon in May
Macquarie Group (disruption through June): oil hits $200/barrel, gas hits $7/gallon
Futures markets: September 2026 crude at ~$75-80/barrel — traders expect resolution by then
The EU warns that "oil and gas prices won't immediately return to normal even if the Iran war ends"

The best-case scenario is a short conflict and a return to normalcy before June auctions. The worst case is a prolonged disruption that locks in elevated rates for a year or more.

What Can You Actually Do About It?

You can't control what happens in the Strait of Hormuz. You can't control PJM capacity auctions or MISO wholesale prices. You can't stop data centers from consuming more power every year.

But you can control whether you're exposed to all of it.

Flow diagram showing how the Iran conflict reaches your electric bill through oil prices, natural gas, wholesale auctions, and the solar bypass

Solar works the same way nuclear does — once the panels are on your roof, your fuel cost is zero. No natural gas. No oil. No auction. No exposure to geopolitical chaos. The sun doesn't care what's happening in the Middle East.

Here's what the math looks like for a typical Illinois home:

Lease ($0 down): Predictable monthly rate for 25 years — you know your full rate schedule before you sign, while utility rates keep climbing. Battery backup included.
Cash purchase: Own the system outright. The utility DG rebate + Illinois SREC payments, now with a new $20/REC owner adder, bring the net cost down significantly. Typical payback in 8-10 years, then very low-cost electricity for the next 15+.
Solar for All: If you're income-qualified, the state of Illinois will install solar on your home at zero cost to you. No credit check required.

Every year you wait, utility rates move higher. The war accelerates that. But the option to get a predictable energy cost at today's prices — or eliminate your bill entirely — is available right now.

The Bottom Line

Illinois is better insulated from this crisis than most of the country, thanks to our nuclear-heavy grid. But "better insulated" doesn't mean "immune." With the June rate reset now on bills, data center demand compounding, and a war that shows no signs of ending quickly, the trajectory for electricity prices is clear: up.

The IEA called this "the largest supply disruption in the history of the global oil market." Whether it resolves in weeks or months, the underlying forces pushing your electric bill higher — data centers, infrastructure costs, and now global energy instability — aren't going away.

If you've been thinking about solar, the case has never been stronger. The incentives are still available. The technology works. And the math gets better every time your utility raises rates.

Check what solar could save you →

Sources

Ryan Cook is the founder of Ltd Solar Consulting, helping Illinois homeowners navigate solar options across Ameren and ComEd territory. Have questions about your specific situation? Get a free quote or call (618) 217-2001.

Frequently Asked Questions

Not immediately — Illinois generates 53% of its electricity from nuclear power, which is insulated from oil price shocks because fuel rods last years and aren't affected by week-to-week oil markets. However, the 17% natural gas slice of Illinois's generation mix is the swing fuel that often sets marginal electricity prices at wholesale, and natural gas prices have risen globally since Iran's IRGC damaged Qatar's Ras Laffan LNG export facility in March 2026. The June 2026 procurement auctions for both ComEd (PJM grid) and Ameren Illinois (MISO grid) could bake elevated gas futures into residential rates for the following 6-12 months if the Strait of Hormuz remains blockaded. Brookings Institution analysis warns that the Iran conflict's energy shocks are not yet fully realized. Illinois customers are better positioned than most states because of the heavy nuclear share, but better positioned is not immune.

Illinois power plants don't burn oil directly, so oil price spikes don't immediately raise generation costs — the state's mix is 53% nuclear, 17% natural gas, 14% coal, 13% wind, and 3% solar and other sources. The link between oil and your bill runs through natural gas, because oil and natural gas prices are correlated on global commodity markets and natural gas is the marginal fuel that often determines wholesale electricity prices in the PJM (ComEd) and MISO (Ameren Illinois) capacity markets. When Iran's Revolutionary Guard damaged Qatar's Ras Laffan LNG facility in March 2026, European gas prices nearly doubled and Asian spot prices rose over 140%. Because US LNG export terminals now consume more natural gas than all 74 million American households combined, global LNG demand increasingly pulls domestic gas prices upward, which can then flow into your electricity rate through procurement auctions.

Illinois generates approximately 53% of its electricity from nuclear power, the highest nuclear share of any U.S. state. Illinois hosts six nuclear plants with eleven reactors, which provides a structural buffer against short-term fuel price shocks because nuclear fuel rods last years rather than being purchased on volatile weekly markets. The remaining Illinois generation mix is approximately 17% natural gas, 14% coal, 13% wind, and 3% solar and other sources. This heavy nuclear reliance is why Illinois residential electricity customers are less immediately exposed to oil and natural gas price spikes than customers in natural-gas-heavy states like Texas or California. However, the 17% natural gas slice still influences wholesale electricity pricing at the margin — meaning even heavily-nuclear grids like ComEd (PJM) and Ameren Illinois (MISO) are partially exposed to the same auction-driven volatility that drove rates up 90%+ since 2021.

The most recent major Illinois electricity rate reset happened on June 1, 2026, when both ComEd (PJM grid) and Ameren Illinois (MISO grid) cycled new capacity auction prices into residential supply rates. On the ComEd side, PJM's 2026-2027 capacity auction cleared at $329.17 per megawatt-day, a more than 1,000% increase over the 2024 price of $28.92 per megawatt-day — those costs were already locked in and hit bills in June. On the Ameren side, MISO's 2025-2026 summer capacity auction cleared at $666.50 per megawatt-day, up from $30 the prior year (a 22x spike), and began flowing through Ameren bills with the June 2026 seasonal reset. Illinois utilities procure electricity through forward auctions, so what happens in those auctions — including any oil-and-gas-related bidding pressure from the Iran conflict — gets baked into your rate for the next 6-12 months with limited flexibility.

Brent crude oil prices surged from approximately $72 per barrel to $112 per barrel over five weeks following U.S. and Israeli strikes on Iran in early 2026, and the subsequent Iranian closure of the Strait of Hormuz — the narrow waterway that normally carries 20% of the world's oil. Maritime traffic through the strait dropped 98% after the closure. U.S. domestic gasoline prices crossed $4 per gallon for the first time since 2022. Analysts project wider bands depending on conflict duration: Goldman Sachs modeled a 3-week conflict leading to $4.36 per gallon gasoline peaks by May, while Macquarie Group's prolonged-disruption scenario projected oil reaching $200 per barrel with gasoline at $7 per gallon. Futures markets currently price September 2026 crude at approximately $75-80 per barrel, suggesting traders expect some resolution by then, but the EU has warned that oil and gas prices will not immediately normalize even after the war ends.

Yes — Illinois electricity rates are set to rise further in 2026 regardless of the Iran conflict, because rate increases were already locked in before the war began. ComEd's supply rate jumped 47% in a single year due to PJM's $329.17 per megawatt-day capacity auction clearing price, and a new capacity charge kicked in June 2026. The Illinois Commerce Commission approved a $243 million ComEd delivery rate hike effective January 2026. Ameren Illinois faces the MISO side: summer 2025-2026 capacity cleared at $666.50 per megawatt-day (a 22x increase), and the ICC granted a $48 million Ameren delivery rate case in late 2025. Ameren has told regulators it plans to file another rate increase request in 2026. Citizens Utility Board projects elevated rates will continue for at least the next few years. The Iran-driven energy uncertainty stacks on top of these already-baked-in increases.

The most reliable way to get a predictable electricity rate in Illinois is through a residential solar lease, which can set a rate as low as $0.10 per kilowatt-hour, predictable for 25 years — compared to ComEd rates of 17.07¢/kWh or Ameren Illinois rates of 15.5¢/kWh that keep rising. Because solar uses sunlight as fuel, your rate is not exposed to PJM or MISO capacity auctions, natural gas price swings, or geopolitical energy shocks like the Iran crisis. For income-qualified Illinois households, the Solar for All program (ILSFA) provides no-cost solar installation with guaranteed savings and requires no credit check. Cash-purchase owners can also bring their long-term electricity cost near zero after Illinois Shines REC payments and the $300-per-kilowatt DG rebate offset the upfront investment. Every year utility rates keep rising, the predictable solar rate becomes a larger relative savings versus grid electricity.