Connecticut Electricity Suppliers: Eversource vs United Illuminating Territory Guide (2026)

Connecticut residents have been able to shop for a competitive electricity supplier since the state deregulated its market, but after several years of dramatic Standard Service rate swings, knowing your utility and how the default rate works has never mattered more. Connecticut has just two electric utilities, which makes the landscape simpler than larger states — but the rate volatility makes smart shopping essential.

How Connecticut Electricity Choice Works

The Public Utilities Regulatory Authority (PURA) oversees Connecticut’s competitive market and runs the official rate-comparison board (Energizect / Rate Board). When you choose a competitive supplier, only the generation portion of your bill changes. Your utility continues to deliver electricity and handle outages, and its delivery charges stay regulated regardless of your supplier.

If you don’t shop, you’re on Standard Service, the default supply rate. Connecticut sets Standard Service prices twice a year — for the periods beginning January 1 and July 1 — based on wholesale procurement. These prices have been notably volatile, with large jumps tied to natural gas costs. That volatility is exactly why a fixed-rate competitive plan can be attractive: it locks your generation price for the full term and insulates you from the next Standard Service spike.

Connecticut Electric Utility Territories

Two investor-owned utilities deliver electricity across Connecticut.

Eversource Energy

Eversource (formerly Connecticut Light & Power, or CL&P) is by far the larger utility, serving roughly 1.2 million customers across about 149 of Connecticut’s 169 towns — most of the state outside the New Haven and Bridgeport areas. If your bill says Eversource, you’ll compare competitive offers against Eversource’s Standard Service rate, and you’ll have the widest selection of suppliers because of the territory’s size.

United Illuminating (UI)

United Illuminating, part of Avangrid, serves about 340,000 customers in the greater New Haven and Bridgeport areas — roughly 17 towns in the southern-central coast region. UI sets its own Standard Service rate and delivery charges, which can differ from Eversource’s. Competitive suppliers operate in UI territory as well, though the pool of offers is smaller than Eversource’s.

Comparing Suppliers in Connecticut

Pull a recent bill, note whether you’re with Eversource or UI, and find your current Standard Service generation rate per kWh. PURA’s rate board lists licensed supplier offers side by side, which makes Connecticut one of the easier states to compare. Focus on fixed-rate plans, the contract term, and the cancellation fee.

Given Connecticut’s history of sharp Standard Service increases, a fixed rate that’s at or modestly below the current Standard Service price — locked for 12 months or more — provides real budgeting certainty. Avoid variable-rate “introductory” offers; Connecticut has seen variable rates climb steeply, and the state has tightened rules around them for good reason.

Supply vs. Delivery: What You Actually Control

Every electricity bill in a deregulated market splits into two halves, and understanding the split is what makes shopping pay off. The delivery (or distribution) charge covers moving electricity over the poles and wires to your home, plus metering, billing, and storm restoration. In Connecticut that’s Eversource or United Illuminating. These charges are set by regulators and are identical whether you shop or not — no competitive supplier can lower them.

The supply (or generation) charge covers the actual electricity you consume. This is the only part of your bill open to competition. When you compare suppliers, you’re comparing this per-kWh generation price — typically the largest single line item on a bill in a high-usage month. Lowering it by even one or two cents per kWh adds up quickly for a household using 800–1,200 kWh a month, and the savings compound over a full contract term.

This is also why a flashy “X% off” claim can mislead: a discount only applies to the supply portion, not your whole bill. Always compare the actual price per kWh, not a headline percentage.

Who Benefits Most From Shopping

Not every household saves the same amount by switching, and being honest about that helps you set expectations. The biggest winners are typically:

High-usage homes. If you have electric heat, central air, a pool pump, an EV, or simply a large house, your supply charge is a big number — so a lower per-kWh rate produces real dollar savings every month.

Households currently on a variable or expired rate. If your introductory rate has rolled over to a variable “month-to-month” price, you may be paying well above market without realizing it. These are the customers who most often find double-digit monthly savings by locking a fixed rate.

Anyone who values budget certainty. Even if a fixed rate only matches your default price today, locking it shields you from the next seasonal spike. For people on fixed incomes or tight monthly budgets, that predictability is worth as much as the headline rate.

Lower-usage apartments and condos save less in absolute dollars, but the same shopping principles apply — and avoiding a runaway variable rate still matters.

Common Mistakes to Avoid

Chasing the lowest teaser rate. The cheapest rate on a comparison list is often an introductory price that converts to a much higher variable rate after one or two billing cycles. Read whether the rate is fixed for the full term.

Ignoring the early termination fee. If you might move or want flexibility, a contract with a steep cancellation fee can erase your savings. Match the term to how long you’ll realistically stay.

Auto-renewing without checking. Many contracts roll into a variable month-to-month rate when they end. Mark your contract’s expiration date and re-shop before it lapses.

Forgetting to compare against your real benchmark. Your savings are measured against your current supply rate — your default/standard price or your existing contract — not against some national average. Pull a recent bill and use your own number.

Frequently Asked Questions

Does switching suppliers change my reliability or outage response?

No. Eversource or UI still owns the wires, reads your meter, and restores power after storms. A competitive supplier only changes the generation charge on your bill.

What is Standard Service in Connecticut?

Standard Service is the default generation rate for customers who don’t choose a competitive supplier. Eversource and UI each set their own Standard Service price twice a year (January and July), based on wholesale procurement.

Why have Connecticut electricity rates been so volatile?

Standard Service prices track wholesale generation costs, which are heavily influenced by natural gas prices in New England. Cold winters and gas-supply constraints have driven sharp Standard Service increases in recent cycles.

Will I get one bill or two if I switch?

One. Connecticut uses consolidated billing, so your utility bills you for delivery and your supplier’s generation on a single statement.

Which Connecticut utility serves my town?

Eversource serves most of the state; United Illuminating serves the New Haven and Bridgeport areas. Your bill names your utility, and your ZIP code maps to one of the two territories.

Is it worth locking a fixed rate in Connecticut?

For many households, yes. Because Standard Service can swing significantly every six months, a fixed rate locked for a year or more removes that uncertainty — just compare the fixed price against the current Standard Service rate first.

Bottom Line for Connecticut Shoppers

With only Eversource and United Illuminating delivering power in Connecticut, identifying your utility is simple — but the state’s volatile Standard Service rates make comparing fixed-rate offers worthwhile. Note your current generation rate, check PURA’s rate board, and lock a competitive fixed plan if it beats or matches Standard Service.