Rate Structures

Electricity rate structures determine how utilities convert the cost of building and operating the electric grid into the prices customers pay for electricity service. Rather than charging a single price for electricity, utilities divide costs into several pricing components such as customer charges, demand charges, and energy charges. These rate structures are defined within utility tariffs and determine how electricity usage is measured, how peak demand is billed, and how costs are allocated across different customer classes. Understanding electricity rate structures helps explain why commercial electricity bills include multiple charges and why two businesses using similar amounts of electricity may pay very different prices.

Geography is one of the reasons two similar businesses pay differently, and it operates at two scales. Between utilities, the rate schedule and its determinants change entirely. Inside a single utility, a territory assembled from previously separate companies can still carry the seams, which is why which Ameren Illinois rate zone you are in is a question with money behind it and a specific place to look for the answer.