Electric Rates

Components of Your Electric Bill

Residential Electric Utility customers pay a monthly customer charge and a monthly energy consumption charge per kilowatt hour (kWh). The monthly customer charge provides a stable revenue source to cover the fixed costs of the utility, while energy charges are based upon customers' energy usage. In addition to these charges, certain classes of commercial customers also see a monthly demand charge on their bills.

2019 Rates

Following three years of controlling capital costs and implementing a tool called a Purchased Power Adjustment (PPA) in 2016 to help mitigate power cost spikes, the Electric Utility conducted a new rate study in 2018 to determine financial needs for the coming years. Thanks to these cost-containing efforts, coupled with an anticipated decrease in the cost of purchasing electricity, the rate study determined a 2% rate decrease each January through 2021 would allow the utility to remain on sound financial footing. The new rates will also allow more leeway for the utility to achieve proactive infrastructure and capital projects to help keep the lights on for years to come.

The average residential electric customer can expect a $24 per year savings on their electric bill compared to 2018, and as of January 2019, are paying rates below those of ComEd customers. The average residential customer’s monthly bill is estimated at $109.48.

Customers wanting more information specific to their business or organization are encouraged to contact Customer Connections Manager Maher Diab at (630) 420-4184.

Below is a table outlining charges to the most common customer classes effective January 2019. Commercial customers are encouraged to utilize the averages provided to help calculate their bills, as bills can vary widely from one business to the next.

Customer Class2019 Rates
  Monthly Customer Charge Energy Charge (kWh) Demand Charge (kWd) Average Monthly Electric Bill

Average kWh = 844

$15.60 $0.1112 N/A $109.48
Small Commercial (GS1)
Average kWh = 1,865
$30.65 $0.1124 N/A $240

Large Commercial (GS2)
Average kWh = 2,500
Average kWd = 100

$30.65 $0.0488 $22.54 $2,407

Very Large Commercial (GS2)
Average kWh = 50,000
Average kWd = 225

$30.65 $0.0488 $22.54 $7,542

Extra Large Commercial (GS2)
Average kWh = 220,000
Average kWd = 750

$30.65 $0.0488 $22.54 $27,673

Purchased Power Adjustment 

The Purchased Power Adjustment (PPA) first appeared on utility bills in Naperville in 2016. This is a monthly adjustment on your electric bill based on actual power costs. The PPA changes monthly and is based on a six-month rolling average.

As part of the 2018 rate study, the utility also adjusted how the PPA is calculated. This move, which better matches the PPA with anticipated costs of buying power, will result in the average residential customer saving $25 in 2019 over what they would have originally paid. 

Take a look at the below graphic to learn more about what a PPA means for your monthly electric bills. 

Purchased Power Adjustment 2017


Naperville enjoys some of the most competitive electric rates in the greater Chicago area when compared to communities serviced by ComEd or through municipal aggregation contracts.