Illinois Commercial Utility Guides
The delivery utility remains responsible for wires or pipes, meters, and emergencies when an eligible business chooses a retail supplier. Procurement markets, supplier-choice rules, and bill components differ by territory and by commodity. Start with the applicable utility below, then the electricity or natural gas overview.
Electricity
ComEd business electricity
Northern Illinois, PJM capacity, utility supply comparisons, and bill data.
Ameren Illinois business electricity
Central and southern Illinois, MISO market context, rates, and usage data.
Natural gas
Nicor Gas commercial service
Northern Illinois outside Chicago (600+ communities); supplier choice and delivery.
Peoples Gas commercial service
City of Chicago gas service, supplier choice, and bill components.
North Shore Gas commercial service
Lake County and far-north suburbs (including Waukegan); confirm vs. Nicor.