WattWorth · Practical guides
How to understand an electricity bill before trying to reduce it
A bigger total does not always mean you used more electricity. Compare the billing period, kWh, unit price and fixed charges in that order.
Match the billing periods
Two bills should cover roughly the same number of days. A five-week bill will naturally be higher than a four-week bill even when daily habits did not change.
Compare kWh, not only money
Kilowatt-hours show the energy used. If kWh increased, look for weather, electric heating or cooling, guests, a new appliance, or longer operating hours.
Find the effective unit price
Subtract fixed fees from the bill and divide the remainder by kWh. This catches tariff changes, although taxes and tiered pricing can still complicate the result.
Check the quiet loads
Routers, consoles, televisions and office equipment may remain on standby. One device is usually small; a cluster running all year is easier to notice.
Measure before replacing
A plug-in power meter and the wattage label are more useful than guessing. Replacement only makes financial sense when the avoided cost is meaningful.
This guide helps reveal the structure of consumption; it does not replace checking a bill, meter or equipment with a qualified professional.