ESCO vs. Broker vs. Consultant: Who Does What in Illinois Energy

The Illinois commercial energy market involves several kinds of service providers, and their roles are easy to confuse because the labels overlap in everyday use. An "energy company" might be a supplier, an intermediary, or an advisor — and each is paid differently and carries different incentives. This guide separates three roles: the ESCO (the supplier), the broker (the intermediary), and the consultant (the advisor). Understanding who does what, how each is compensated, and where conflicts can arise is the foundation for deciding which — if any — a business actually needs.

The ESCO: the entity that sells you energy

ESCO stands for energy service company, and in retail supply it refers to the competitive supplier that actually sells the commodity. In Illinois, electricity suppliers are licensed as Alternative Retail Electric Suppliers (ARES) and gas suppliers as Alternative Gas Suppliers (AGS), both regulated by the Illinois Commerce Commission. An eligible commercial account can choose a licensed supplier or remain on the utility's default supply.

The critical point about the ESCO is that it provides only the supply portion of the bill. It does not own the wires or deliver the power. ComEd in northern Illinois and Ameren in central and southern Illinois remain the delivery utilities regardless of which supplier you choose — they maintain the lines, read the meter, restore outages, and bill delivery charges under their regulated tariffs. Choosing an ESCO changes the supply line on the bill and nothing about reliability or service. This is covered further under commercial electricity and commercial natural gas.

A note on terminology: outside retail supply, "ESCO" is also used for firms that design and install efficiency projects, sometimes under performance contracts. That is a different business from selling the commodity. On this site, ESCO refers to the licensed retail supplier unless stated otherwise.

The broker: the intermediary who helps you shop

An energy broker does not sell energy. A broker helps a business shop among licensed suppliers, solicits offers, and facilitates a supply contract. A good broker can gather usage, request comparable quotes on matched delivery dates, and explain the terms — services that save a busy facilities or finance team significant time, especially across multiple meters.

How brokers are typically paid. Most brokers are compensated by the supplier rather than invoicing the business directly. Commonly this takes the form of a margin added into the energy rate — the broker's fee is embedded in the price per unit and paid to the broker by the supplier over the life of the contract. Because that cost is built into the rate rather than shown as a separate charge, it is not always obvious. The practical response is simply to ask: how are you compensated, and is your fee embedded in the rate? A broker willing to disclose that clearly is easier to evaluate. See broker fees and commissions for a fuller treatment.

Where conflicts can arise. Because a broker is usually paid by the supplier, and sometimes paid more for a higher embedded margin or a longer term, incentives are not automatically aligned with the buyer. This does not mean brokers are not useful — many provide real value — but it does mean the compensation structure deserves daylight. Asking for the offers to be presented so they can be compared apples-to-apples, on a fully-loaded basis, is one way to keep the process honest regardless of how the broker is paid.

The consultant: the advisor you engage directly

An energy consultant is generally retained and paid directly by the business to provide independent advice. Rather than earning a commission from a supplier, a consultant typically charges a fee — hourly, project-based, or a retainer — and advises on strategy without necessarily arranging any single supply contract.

Consultants tend to work on the analytical and strategic layer: reviewing 12 to 24 months of usage and interval data, establishing the utility price-to-compare as a benchmark, modeling contract structures such as fixed versus index or block-and-index, reviewing contract terms for pass-throughs and bandwidth risk, advising on demand charges, and building a procurement calendar across a portfolio. Because the consultant is paid by the business rather than by a supplier, the conflict inherent in supplier-paid compensation is reduced — though it is still worth confirming the fee arrangement and whether the consultant also earns anything from suppliers.

In practice the lines blur. Some firms act as broker and consultant at once, and some brokers offer consultant-style analysis. The label matters less than two questions: who pays this person, and does that create an incentive that diverges from mine?

How to decide which you need

There is no requirement to use any intermediary. An eligible Illinois business can shop directly with licensed suppliers or stay on default utility supply. The right approach depends on the account:

• Small, simple accounts with internal capacity. A business with one or two meters and staff who can read a bill and compare offers may not need an intermediary at all. The utility benchmark and a disciplined comparison can be handled in-house.
• Busy teams that value time. A broker can absorb the legwork of soliciting and organizing offers. The trade-off is the embedded compensation, so disclosure and matched comparisons matter.
• Large, complex, or multi-site portfolios. Accounts with interval data, demand charges, capacity exposure, or many staggered renewal dates often benefit from consultant-style analysis, whether from an independent consultant or a broker who works transparently. The value is in strategy and structure, not just in fetching a rate.

Across all three, the same principles protect the business: understand how each party is paid, keep offers comparable on a fully-loaded basis, and treat any quoted rate as a starting point rather than a promise. Fold whichever help you use into the broader commercial energy procurement process and, for portfolios, multi-location procurement.

Questions worth asking any provider

• Are you the supplier (ESCO), an intermediary (broker), or an independent advisor (consultant)?
• Who pays you, and is any fee embedded in the energy rate?
• Will you present offers on matched delivery dates and volumes so I can compare them directly?
• Are you licensed with the Illinois Commerce Commission where required?
• What happens at renewal, and how will notice and end dates be tracked?

Clear answers to those five questions tell a business most of what it needs to know about the role a provider plays and whether their incentives line up with its own.

Sources

• Illinois Commerce Commission
• Illinois Commerce Commission — Plug In Illinois: Electric Choice Basics

Understanding roles and incentives improves decisions; no provider or arrangement guarantees savings.