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Of course, with electricity demand falling â thanks in large part to the popularity of rooftop solar â power companies are using the fixed cost components of their billing systems to help cover their own fixed costs, while also compensating for lower usage by consumers.
1 Energy Charge-For the amount of electricity you use. 2  Electricity is measured in kilowatt-hours (kWh). 3  One kilowatt-hour is equal to the power used by 10 100-watt bulbs for one hour. 4  Customer Charge-A fixed charge that does not change with the amount of electricity you use.