Utilities generally charge a different rate per kilowatt hour of electricity used for commercial and residential customers. Many utilities have a variety of rate structures within those categories. This can be based on many different factors. The most common rate class being "general standard delivery" or "standard delivery". Below is an example of where you might find your rate class on a utility bill. CLICK HERE for detailed examples of utility bills.
If you are still unsure, call you local utility company for the information or email firstname.lastname@example.org.