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Estimating Electricity Use and Cost
Step 1: Your electric bill is determined by the number of kilowatt-hours (kWh) used during a billing period. Your average kWh cost equals the dollar amount of the energy portions of your electric bill, divided by kWh used. $150 ÷ 1,200 kWh = 12.5¢ per kWh.
Step 2: Wattage determines electrical use per hour and can be found on the serial plate of the appliance. Electric load may also be expressed in volts and amps, rather than watts. If so, multiply volts times amperes to determine the wattage. 120 volts x 12.1 amps = 1,452 watts.
Step 3: Use the formula shown in the following example to estimate use and cost. A light uses 100 watts and is left on for 15 hours. How many kWh are used and what does it cost you? kWh used = (100 watts x 15 hours) ÷ 1,000 watts = 1.5 kWh. Your cost = 1.5 kWh x 12.5¢ = 18.75¢.
Dakota Electric sends out Circuits monthly newsletter to our members each month. Inside, members can find valuable money- and energy-saving tips, special event details, news about Dakota Electric and electric utility industry information that may impact electric bills.
Dakota Electric Association
4300 220th Street West
Farmington, Minnesota 55024