Illinois · municipal utility
Naperville Electric Utility: power factor rules
Naperville requires customers to keep power factor at 95–100%. A power factor/quality fee can apply under an individual written agreement, but its amount isn't published.
Partly confirmed Tariffs checked 2026-10-03
Smaller customers
The 95–100% requirement applies to all classes.
The power-factor rule
GS1 (under 50 kW), GS2 (over 50 kW), PM, TM; Service Rules section 25
Applies to: All customers.
How it works: Customers must maintain 95–100% power factor and may be required to install corrective equipment. Under a written agreement, a customer causing poor power factor or power quality can be charged a power factor/quality fee. There is no automatic kVAR charge in the rate tables.
"DPU-E electrical service standards for supplying its Customers require the Customer to maintain a power factor of ninety-five (95%) percent to one hundred (100%) percent."
Source: Naperville Municipal Code Title 8, Ch. 1, Art. C; DPU-E Service Rules and Policies, Code section 8-1C-4 item 5; Service Rules section 25. Code last amended November 19, 2024; service rules April 2021. Checked 2026-10-03; review by 2027-10-03.
Caveats
- The fee amount and formula are set by individual agreement and aren't published.
What to do next
- Size the kVAR for your load.
- Send us a bill and we'll tell you what you're paying and what correction is worth.
Cities we serve in Naperville Electric Utility territory
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.