How to Read a Commercial Retail Power Contract: A Clause-by-Clause Guide
By Illinois Commercial Energy editorial team
Reviewed by JakenEnergy commercial energy team
How to Read a Commercial Retail Power Contract
A retail electricity or natural gas supply contract is a commercial agreement, not a utility form. In Illinois, eligible commercial customers can buy the supply portion of their energy from a licensed Alternative Retail Electric Supplier (ARES) for electricity, or from an alternative gas supplier, instead of taking the utility's default supply. Whichever you choose, your delivery utility still delivers the energy, maintains the infrastructure, and restores service after an outage. The supplier contract affects only the supply portion of what you pay.
Because the document is written by the supplier's counsel, the headline price is usually the least ambiguous part. The clauses around it decide what that price actually includes and what can move. This guide walks through the sections you will find in most commercial supply contracts and what to check in each.
Parties, Accounts, and Service Territory
The first section identifies the supplier, your legal entity, and the specific utility accounts covered. Confirm that the entity name matches the one that will be liable, and that every account number and meter you intend to enroll is listed. For multi-site businesses, an account left off the schedule stays on default supply.
Check which delivery utility serves each account, because it determines the market your supply is priced in. ComEd serves northern Illinois and sits in the PJM market; Ameren Illinois serves central and southern Illinois and sits in MISO. A few municipalities — Naperville and Springfield among them — run municipal electric systems where retail supplier choice is not available. See /utilities/comed/ and /utilities/ameren/ for territory detail.
Pricing Scope and Inclusions
This is the clause that defines the product. Read it before you react to the number.
- All-in fixed price rolls most supply-side components into one rate per kWh (or per therm for gas). It gives the most budget certainty but usually carries a premium for the risk the supplier absorbs.
- Fixed energy with pass-throughs fixes the energy component and bills specified items separately at cost. For electricity in PJM, capacity and transmission are the components most often passed through rather than fixed.
- Index or block-and-index ties some or all volume to a wholesale market index, trading certainty for exposure.
Identify exactly which components are inside the price and which sit outside it. Capacity is a frequent source of confusion: in the ComEd/PJM zone a customer's capacity obligation is set by a peak-load contribution tag, and how the contract treats that tag can change your cost even when the energy rate does not. See /commercial-demand-charges/ for how peak behavior flows into cost.
Pass-Throughs
Where the contract uses pass-throughs, look for a defined, closed list. Vague language such as "including but not limited to" transfers open-ended risk to you. Reasonable pass-throughs are tied to identifiable market or regulatory charges the supplier does not control. The goal is not to eliminate pass-throughs but to know precisely what they are so no line item is a surprise.
Bandwidth and Swing
Fixed-price contracts assume a volume. The bandwidth (or swing) clause sets how far actual usage can drift from that assumption before the excess or shortfall settles at a market-based price rather than your contract rate. Businesses with steady, predictable load may barely notice this. Seasonal operations, or any load that could grow or shrink during the term, should size the tolerance to their real usage pattern. Our deep dive on bandwidth and swing clauses covers how to do that.
Change-in-Law and Regulatory Adjustments
Multi-year contracts run through unknown regulatory territory. A change-in-law clause lets the supplier recover costs created by new laws, tariff changes, or market-rule changes during the term. A narrow, specifically defined clause keeps your fixed price meaningful; a broad one lets more cost through. Note whether the clause is symmetric — whether it also passes savings back to you if a rule change lowers costs.
Term, Start, and End Dates
Confirm the term length and the exact start and end. The start is usually a meter-read date, not a calendar date, so it can fall a few weeks either side of a month boundary. Line the end date up against your planning cycle so a renewal decision does not land during your busiest season. If the contract is forward-dated to begin months after signing, review the trade-offs in forward-start contracts.
Termination and Early Exit
Read the termination clause before you sign, not when you want out. Commercial supply contracts commonly use a liquidated-damages or market-difference formula rather than a flat fee, so the cost of leaving early depends on where wholesale prices sit at the time. Understand how the exit amount is calculated and what notice is required.
Renewal, Holdover, and Evergreen Terms
The renewal section decides what happens at the end of the term. Some contracts expire cleanly; others auto-renew (evergreen) or roll to a holdover rate that can be materially higher than a freshly negotiated price. Note the renewal notice window — the span during which you must give notice to prevent automatic renewal — and calendar it. Our contract renewal timeline shows how to work backward from the end date.
Credit, Deposits, and Assignment
Suppliers assess credit and may require a deposit, guaranty, or letter of credit, especially for larger loads. Check the triggers that let the supplier reassess credit mid-term and what remedies follow. Review assignment language too: whether the supplier can transfer your contract to another party, and whether you can assign it if you sell or restructure the business.
Billing and Disputes
Confirm whether billing is consolidated through the utility or billed separately by the supplier, when payment is due, and the process and deadline for disputing a charge. A defined dispute window protects you if a billed quantity or pass-through looks wrong.
Putting It Together
Read the whole document, then read it again against a second offer. The most useful comparison is not rate against rate but clause against clause: pricing scope, pass-throughs, swing, term, termination, and renewal. For structured procurement help, see /commercial-energy-procurement/ and /commercial-energy-contract-review/, and for electricity- and gas-specific context, /commercial-electricity/ and /commercial-natural-gas/.
Sources
This guide is educational and does not promise any specific savings. Your terms depend on your utility, load, and the contract you negotiate; read the full agreement and confirm details with the primary sources above.
Frequently Asked Questions
QDoes a retail supply contract cover my whole electricity bill?
No. A retail supplier contract governs only the supply (commodity) portion of your bill. Your delivery utility — ComEd, Ameren Illinois, or a gas utility such as Nicor, Peoples, or North Shore — still bills you separately for delivery, and continues to maintain the wires or pipes and handle outages regardless of who supplies your energy.
QWhat is the difference between an all-in fixed rate and a fixed rate with pass-throughs?
An all-in fixed price bundles most supply-side components into one number per kWh or therm. A fixed price with pass-throughs fixes the energy component but bills certain items — commonly capacity, transmission, ancillary services, or regulatory charges — separately at cost. Two quotes can show the same headline rate yet settle very differently, so the pricing-scope clause matters as much as the number.
QWhy does the contract mention a bandwidth or swing percentage?
That clause defines how much your actual usage can deviate from the expected volume before out-of-band energy is settled at a different price. If your load is seasonal or variable, the bandwidth terms can materially change what you ultimately pay, so read them alongside the price.
QWhat is a change-in-law clause and why should I care?
A change-in-law (or regulatory) clause lets the supplier pass through new costs created by changes in law, tariffs, or market rules during the term. The narrower and more specifically defined it is, the more predictable your fixed price will be.
QHow do I compare two supplier contracts fairly?
Line up the same terms side by side: what the price includes, which items pass through, the swing tolerance, the term length, the termination formula, and the renewal mechanics. Our guide on comparing offers apples to apples walks through building that comparison.