Electric utilities use the System Average Interruptible Duration Index (SAIDI) to measure the reliability of electric utility systems. The SAIDI represents the average number of minutes each customer can expect to be without power in a given year. This is a comparison of Naperville with Com Ed SAIDI data.

Citywide total daily electric load (usage) measured hourly, presented here as a daily total.

Electric utilities use the System Average Interruptible Duration Index (SAIDI) to measure the reliability of electric utility systems. The SAIDI represents the average number of minutes each customer can expect to be without power in a given year. This is a comparison of Naperville with Com Ed SAIDI data.

Citywide total daily electric load (usage) measured hourly, presented here as a daily total beginning on January 1, 2012 through last updated date.

Naperville's Electric Customer Classification.

As both a consumer and provider of resources and energy, the City of Naperville seeks to provide customer education and take fiscally-sound conservation actions to use available resources responsibly.

System Average Interruption Duration Index (SAIDI) Outage in Minutes. SAIDI is the average outage duration for each customer served, and is calculated as the sum of all customer interruption durations divided by the total number of customers served . SAIDI is measured in minutes or hours over the course of a year, and according to IEEE Standard 1366-1998 the median value for North American utilities is approximately 1.50 hours.

Customer count by customer class

Number of Joint Utility Locating Information for Excavators (JULIE) Requests Serviced by Electric Utility per month

In order to better align the cost the utility pays to purchase power from its supplier, a purchased power adjustment was added to the customer bills. As the price of power goes up or down, due to open market forces, the utility can raise or lower what it charges its customers to match what it pays for the power.