Market Intelligence Guides for Illinois Businesses
Read market developments in the context of the contract, delivery year, and account they may affect.
PJM and MISO are different markets with different capacity structures. A published market result can be relevant to future supply costs, but the account obligation, product, delivery dates, and contract treatment determine the practical exposure.
Use current primary-source documents and preserve their publication and effective dates. Explain what is known and what remains an assumption. A market commentary is a prompt for account-specific analysis, not a promise of a rate or savings outcome.
Guides in this topic
Capacity Performance Rules and Your Curtailed Load
What PJM capacity performance means for commercial buyers with curtailable load, and how committed obligations and curtailment interact.
Updated 2026-08-01
ComEd Default Supply vs. an ARES: How a Small Business Should Decide
Staying on ComEd utility supply vs. contracting with a licensed ARES: what each means, what changes, what doesn't, and how to decide against the price-to-compare.
Updated 2026-08-01
Community Choice Aggregation (CCA) and Illinois Commercial Energy
What municipal aggregation is in Illinois, how it works for residents and small accounts, and why most commercial customers contract directly instead.
Updated 2026-08-01
Demand Response for Commercial Tenants in ComEd Territory
How demand response works for commercial tenants: who controls load, submetering, and splitting incentives with landlords in ComEd territory.
Updated 2026-08-01
Demand Response for Illinois Businesses: How It Works
How commercial demand response works in Illinois — PJM and MISO programs, curtailment, who qualifies, and how it differs from managing demand charges.
Updated 2026-08-01
Distributed Energy Resources and Illinois Commercial Grid Resilience
What DERs are, how storage, generation, controllable load, and solar contribute to a commercial site's resilience and cost management, and interconnection basics.
Updated 2026-08-01
Forward Curves 101 for Commercial Electricity Buyers
What a forward price curve is, why it varies by delivery period, and how it explains quote windows and start-date sensitivity for Illinois buyers.
Updated 2026-08-01
Grid Congestion and Basis Risk in the PJM ComEd Zone
What transmission congestion and locational basis mean in the PJM ComEd zone, and why basis risk matters when comparing index and pass-through supply products.
Updated 2026-08-01
How Commercial Electricity Choice Works in Illinois
How Illinois commercial electricity choice works — utility delivery vs. supplier supply, who's eligible, and where municipal utilities remove it.
Updated 2026-08-01
How RTO Market Rules Shape Illinois Commercial Energy Prices
How PJM and MISO market rules for energy, capacity, and transmission shape what Illinois commercial buyers ultimately pay.
Updated 2026-08-01
Illinois Commercial Energy Glossary
Clear definitions of the Illinois commercial energy terms that matter: ARES, price to compare, capacity tag, demand charge, block-and-index, Rider T, and more.
Updated 2026-08-01
Illinois Deregulated Energy Market Explained
How Illinois's competitive commercial energy market works: the 1997 choice law, regulated delivery vs. competitive supply, and the roles of the ICC and IPA.
Updated 2026-08-01
Illinois Energy Deregulation: Timeline and History
A factual history of Illinois electric and gas customer choice, from the 1997 Customer Choice law to today's competitive supply market.
Updated 2026-08-01
Illinois in PJM: Navigating Regional Grid Dynamics
How Illinois fits into PJM through the ComEd zone, and what regional grid and interconnection dynamics mean for commercial buyers.
Updated 2026-08-01
Making Defensible Green Claims When Using RECs in Illinois
How to substantiate environmental claims with RECs and green tariffs, avoid double-counting, and follow FTC and SEC principles.
Updated 2026-08-01
MISO PRA vs PJM BRA: What's the Difference?
How MISO's Planning Resource Auction and PJM's Base Residual Auction differ in what they procure, timing, and zonal or seasonal structure.
Updated 2026-08-01
Municipal Aggregation vs. Individual Retail Supply for Small Businesses
How opt-out municipal aggregation compares with shopping individual retail supply for small commercial accounts, including mechanics and eligibility.
Updated 2026-08-01
Navigating PJM and MISO Markets for Illinois Businesses
How PJM and MISO organize energy, capacity, and ancillary services, and how that structure reaches an Illinois buyer through supply pricing.
Updated 2026-08-01
Time-of-Use Pricing for Illinois Commercial Accounts
How time-of-use and hourly electricity pricing work for Illinois businesses — when they help, the load-shape risk, and evaluating suitability.
Updated 2026-08-01
Understanding CEJA for Illinois Commercial Energy
A durable explainer of Illinois's Climate and Equitable Jobs Act (CEJA) and why the 2021 law matters to commercial energy customers.
Updated 2026-08-01
Understanding Real-Time Price Formation in PJM
How PJM's real-time locational marginal prices form from energy, congestion, and loss components, and what day-ahead versus real-time means.
Updated 2026-08-01
Winter Reliability and Price Risk in PJM
How cold-weather demand, generator performance, and reserve procedures shape winter reliability in PJM, and what price risk it implies for buyers.
Updated 2026-08-01
Need an account-specific answer?
These guides explain how Illinois commercial energy works. A specific recommendation starts with your actual bill, usage, and contract dates.