Illinois · investor-owned utility
ComEd: power factor rules
No power-factor, kVAR or kVA charge anywhere in ComEd's current delivery rate book. ComEd can require a customer with low power factor to correct it to at least 85% lagging.
No power-factor charge found Tariffs checked 2026-10-03
Smaller customers
No power-factor billing for any nonresidential delivery class.
What the tariff says
General Terms and Conditions (applies alongside Rate RDS, Retail Delivery Service)
Applies to: Any retail customer whose equipment causes low power factor.
How it works: ComEd may require correction to at least 85% lagging at the customer's 30-minute maximum demand. The customer either installs correction equipment to ComEd's specifications or pays for ComEd-furnished facilities as nonstandard facilities (Rider NS). Standard service is sized assuming an 85% power factor.
"the Company has the right to require the retail customer to correct its low power factor to a value not less than eighty-five per cent (85%) lagging"
Source: Commonwealth Edison Company, ILL. C. C. No. 10 – Schedule of Rates for Electric Service, General Terms and Conditions, 4th Revised Sheet No. 154 (85% sizing: Sheet No. 155). Sheet 154 effective January 1, 2014; ratebook compiled October 2, 2026. Checked 2026-10-03; review by 2027-10-03.
Caveats
- In Illinois you can buy supply from a retail supplier, but ComEd still delivers it. We reviewed ComEd's delivery tariff; a supply contract can carry its own terms. Transmission pass-through charges were not reviewed.
What to do next
- Size the kVAR for your load.
- No charge doesn't always mean no benefit: correction can still free capacity and cut losses.
Cities we serve in ComEd territory
- Chicago, IL
- Rockford, IL
- Aurora, IL
- Elgin, IL
- Waukegan, IL
- Cicero, IL
- Arlington Heights, IL
- Evanston, IL
- Schaumburg, IL
- Palatine, IL
- Skokie, IL
- Des Plaines, IL
- Orland Park, IL
- Hoffman Estates, IL
- Oak Lawn, IL
- Berwyn, IL
- Elmhurst, IL
- Lombard, IL
- Carol Stream, IL
- Crystal Lake, IL
- Wheaton, IL
- Tinley Park, IL
- Downers Grove, IL
- Glenview, IL
- Mount Prospect, IL
- Buffalo Grove, IL
- Streamwood, IL
- Hanover Park, IL
- Park Ridge, IL
Tariffs change. This summary reflects the documents cited above as checked on 2026-10-03; your utility's current rate schedule and your bill govern what you pay.