The Water Utility calculates the System Average Interruption Duration Index (SAIDI) to measure the reliability of the water system. This index is represented as the total number of minutes each customer can expect to be without service in a given year.
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.
Aggregated monthly tax revenues for retail sales tax, citywide food & beverage, downtown food & beverage, and home rule sales tax from 2009 to 2017. The City implemented a food and beverage tax in 2004 and a downtown food and beverage tax was added in 2008. Home rule sales tax was enacted in July 2016. Rates have changed for some taxes over time, so revenues are factored to quarter-percent rates. The data is used in the Downtown Special Events Analysis (https://data.naperville.il.us/d/nuvp-g4r9/)