Constellation Energy Plans: How to Compare Rates, Terms and Electricity Costs

Choosing among electricity plans can be difficult when several suppliers offer different rates, contract lengths, promotional features and pricing structures.

Consumers searching for Constellation energy plans may see fixed-rate, renewable-energy and other plan options. But comparing plans requires more than looking at the advertised price per kilowatt-hour.

The actual cost of an electricity plan depends on several factors, including your usage, supply rate, monthly charges, contract terms, utility delivery charges and other applicable fees.

This guide explains how to evaluate Constellation plans and compare them with other available electricity options using your actual energy needs.

What Are Constellation Energy Plans?

Constellation is a retail energy supplier that offers electricity and natural gas plans in multiple markets. Its Illinois energy page currently lists fixed-rate electricity plans, renewable-energy options and natural gas plans, with availability determined by the customer’s location.

Constellation also explains that customers can enter their ZIP code to see plans available in their area.

This is important because energy-plan availability and pricing can vary by service territory and location.

Constellation as an Energy Supplier

An energy supplier is different from the local utility responsible for delivering electricity.

The supplier generally provides the energy supply under the terms of the selected plan, while the utility continues to operate the local delivery infrastructure.

Constellation states that Illinois customers continue using their existing utility for delivery and billing while the supplier provides the energy supply.

Why the Supplier-Utility Difference Matters

Your electricity bill may contain several components.

These can include:

• Energy supply
• Transmission
• Distribution
• Customer charges
• Taxes
• Other applicable fees

Changing suppliers does not necessarily mean changing the company responsible for physically delivering electricity to your property.

Understanding this distinction makes it easier to compare supplier offers accurately.

Types of Constellation Electricity Plans

Constellation currently describes several types of residential electricity plans, including fixed-rate, renewable-energy, electric-vehicle, time-of-use and variable-rate options depending on the market.

The options available to an individual customer can depend on location and eligibility.

Fixed-Rate Electricity Plans

A fixed-rate plan generally provides a set supply rate for the contracted period.

This can make the supply portion of your electricity costs easier to estimate.

However, a fixed energy rate does not mean that your total monthly bill will be identical every month.

Your electricity usage can still change.

What a Fixed Rate Does

A fixed supply rate can provide:

• Greater rate predictability
• A defined contract period
• Easier budgeting for supply costs
• Protection from certain supply-rate changes during the contract term

What a Fixed Rate Does Not Do

A fixed rate does not necessarily lock your entire electricity bill.

Your total bill can still change because of:

• Higher or lower electricity usage
• Utility delivery charges
• Taxes
• Other applicable charges

Before enrolling, review the plan documents rather than relying only on the advertised rate.

Renewable Energy Plans

Constellation also offers renewable-energy options in markets where they are available. Its Illinois page describes renewable plans associated with renewable energy certificates.

If renewable energy is important to you, check exactly what the plan includes and review the applicable terms and disclosures.

What to Check

Look for:

• Renewable percentage
• Renewable Energy Certificates
• Contract length
• Supply rate
• Additional charges
• Eligibility
• Terms and conditions

Variable-Rate Plans

Variable-rate plans can allow the supply rate to change according to the plan’s terms.

Constellation describes variable-rate options as plans where rates can change rather than remaining locked for the entire contract period.

Before selecting this type of plan, understand:

• How often the rate can change
• How changes are determined
• Whether there is a contract term
• What happens during renewal
• Whether cancellation charges apply

How to Compare Constellation Energy Plans

A meaningful comparison should evaluate the complete plan rather than one advertised number.

Start by reviewing your current electricity bill.

Your bill can tell you:

• Monthly kWh consumption
• Current supply rate
• Supply charges
• Delivery charges
• Customer charges
• Taxes
• Current supplier
• Contract information

Once you understand your current costs, you can compare available plans using your actual consumption.

Step 1: Identify Your Typical Usage

Review several months of electricity bills.

Do not rely exclusively on one month because electricity usage can vary throughout the year.

For example, your consumption may be different during:

• Summer cooling periods
• Winter heating periods
• Vacations
• High-occupancy periods
• Low-occupancy periods

Using an annual or multi-month average can produce a more realistic comparison.

Step 2: Compare the Supply Rate

The supply rate is commonly expressed in cents per kWh.

But the supply rate should not be considered the complete electricity cost.

A plan with a lower supply rate can still have a different total cost if other charges or usage conditions apply.

Step 3: Check Monthly Charges

Review whether the plan includes a recurring monthly charge.

A fixed monthly charge can have a meaningful impact on total costs, particularly when electricity consumption is relatively low.

Step 4: Review Contract Length

Check how long the plan lasts.

A contract may run for a specified number of months, and the rate and other terms can apply during that period.

Make sure the contract length fits your circumstances.

Step 5: Read the Cancellation Terms

Review the early termination provisions carefully.

Constellation’s current plan materials indicate that termination provisions can vary by market and contract, so customers should check the specific plan documents before enrollment.

Step 6: Understand Renewal

A contract does not necessarily end the relationship between the customer and supplier.

Review what happens when the initial term expires.

Constellation’s current renewal information explains that renewal treatment can vary by state and that customers may receive options for selecting another plan.

Compare the Total Cost, Not Just the Rate

One of the biggest mistakes when comparing electricity plans is focusing only on cents per kWh.

Consider this simplified example.

Plan A

• 12¢/kWh
• $15 monthly charge
• 12-month contract

Plan B

• 13¢/kWh
• $5 monthly charge
• 12-month contract

At first glance, Plan A appears less expensive because its energy rate is lower.

But the monthly charge changes the calculation.

Your actual usage determines how much each pricing component contributes to your overall cost.

Why Usage Matters

A household using 500 kWh per month has a different cost profile from one using 1,500 kWh.

For that reason, compare plans at your own expected consumption level whenever possible.

Understand the Price to Compare

The Price to Compare, or PTC, can be an important benchmark when evaluating competitive electricity offers.

Illinois consumers can use the state’s supplier-comparison resources to evaluate retail supplier offers against the utility’s supply price. The Illinois Commerce Commission has explained that supplier offers can include monthly recurring charges, and utility delivery charges remain separate from the supplier comparison.

You can review the current Illinois electricity supplier offers and comparison information when evaluating available options.

Why PTC Matters

The PTC helps establish a reference point for the utility’s supply cost.

However, make sure you understand which portions of the bill are represented.

Do not compare:

Supplier supply rate

directly against:

Your entire utility bill

without accounting for the different components.

Constellation Energy Plans and Utility Delivery

Switching suppliers does not normally mean that the physical delivery system changes.

Constellation explains that Illinois customers continue to receive utility delivery service while choosing a retail supplier for energy supply.

This means you may continue receiving service from the same utility even after selecting a different supplier.

What the Utility Does

The utility generally remains responsible for the local delivery infrastructure.

Depending on the service territory, this can involve:

• Power lines
• Distribution equipment
• Metering
• Local delivery
• Outage response

What the Supplier Does

The retail supplier provides the energy supply under the terms of the selected plan.

This distinction helps explain why switching suppliers does not necessarily change every part of your electricity bill.

What to Look for in the Plan Documents

Never rely exclusively on a marketing headline.

Before enrollment, review the actual plan documents.

Electricity Facts Label

An Electricity Facts Label, where applicable, can provide important pricing and plan information.

Look for:

• Energy rate
• Usage assumptions
• Contract term
• Monthly charges
• Additional fees
• Renewable content
• Cancellation provisions

Terms of Service

The Terms of Service explain the contractual relationship.

Review:

• Start date
• End date
• Payment conditions
• Rate conditions
• Renewal terms
• Cancellation provisions
• Other charges

Customer Rights Information

Also review any applicable customer-rights documentation.

This can help you understand the rights and obligations associated with the selected energy plan.

Constellation’s current enrollment materials provide access to plan documents including the Electricity Facts Label, Terms of Service and Your Rights as a Customer.

Fixed vs. Variable Electricity Rates

If you are comparing Constellation plans with other suppliers, rate structure should be one of the first things you examine.

Fixed-Rate

A fixed-rate structure generally provides greater supply-rate stability during the contract period.

It may be useful for customers who prefer predictable supply pricing.

Variable-Rate

A variable-rate structure can allow the supply rate to change.

It may offer a different level of flexibility but requires closer attention to future pricing.

For a detailed explanation of the two structures, see the fixed vs. variable electricity rates guide.

How Your Electricity Bill Helps You Compare Plans

Your existing bill is one of the most useful tools for energy shopping.

Instead of starting with a generic rate advertisement, start with your actual consumption.

Find Your Monthly kWh

Look at your most recent bills and identify your kWh usage.

Calculate Your Average

Add several months together and calculate an approximate average.

Identify Seasonal Differences

Look for months where consumption is significantly higher or lower.

Review Your Current Supply Cost

Find the portion of the bill related to electricity supply.

Check Your Contract Status

If you already have a competitive supplier, determine when the current agreement ends.

This information can help you avoid unnecessary cancellation charges or an automatic renewal you did not expect.

Using an Energy Comparison Tool

Comparing plans manually can involve reviewing multiple rates, contract terms and pricing structures.

An online comparison platform can organize those options into a more understandable format.

97 Options allows consumers to explore electricity plans and compare available energy options.

You can use electricity plan comparison tools to explore available options based on your location and energy needs.

AI-Powered Bill Analysis

A utility bill can contain information that is difficult to interpret quickly.

AI-powered bill analysis can help organize information such as:

• Electricity usage
• Existing supplier
• Current charges
• Rate information
• Account details
• Usage patterns

97 Options also provides resources through its Energy Guide to help consumers understand electricity pricing and energy-plan terminology.

Common Mistakes When Comparing Constellation Plans

Looking Only at the kWh Rate

The headline rate does not necessarily represent your complete electricity cost.

Ignoring Monthly Charges

Recurring charges can affect your effective cost.

Comparing Different Usage Levels

A plan should be evaluated at a usage level that reflects your actual consumption.

Not Reading the Contract

The rate is only one part of the agreement.

Ignoring Renewal Terms

Understand what happens after your initial contract ends.

Using Old Pricing Information

Energy offers can change. Always check the current plan details before enrollment.

Assuming Fixed Rate Means Fixed Bill

Your supply rate may remain stable while your total bill changes with electricity usage and other charges.

Frequently Asked Questions

What are Constellation energy plans?

Constellation offers different electricity and natural gas plans, including fixed-rate and renewable-energy options in markets where they are available. Plan availability depends on location.

Are Constellation electricity plans fixed rate?

Constellation offers fixed-rate electricity plans, but the available products depend on the customer’s location and current offers.

Can I compare Constellation with other electricity suppliers?

Yes. Comparing the supply rate, monthly charges, contract terms, usage requirements and other conditions can help you understand the differences between available offers.

Does Constellation deliver my electricity?

Constellation is a retail energy supplier rather than the local utility responsible for physical electricity delivery. In Illinois, the utility continues to provide delivery service.

Does a fixed electricity rate guarantee the same monthly bill?

No. A fixed supply rate does not mean that your electricity usage remains fixed. A higher or lower number of kWh can change the total bill.

What happens when an energy contract ends?

The renewal process depends on the supplier, plan and location. Constellation’s current information states that renewal treatment can vary by state and that customers can receive options for selecting another plan.

How should I compare electricity plans?

Start with your current bill, identify your typical usage, then compare supply rates, monthly charges, contract terms, cancellation provisions, renewal conditions and other applicable costs.

Final Thoughts

Comparing Constellation energy plans is easier when you look at the entire pricing structure rather than focusing on a single advertised rate.

Start with your electricity bill.

Understand your typical usage, current supply cost and contract status. Then compare available plans using the same usage assumptions.

Pay particular attention to:

• Supply rate
• Monthly charges
• Contract length
• Fixed or variable pricing
• Cancellation terms
• Renewal conditions
• Utility delivery charges
• Promotional conditions

Current plan availability and pricing can change, so always verify the specific offer and read its plan documents before enrolling.

A careful comparison gives you a clearer understanding of how an electricity plan fits your actual usage and budget.