Most "my bill jumped" stories have one of three causes: the rate went up, the billing period got longer, or the household used more energy. Only the last one is something an appliance or a draft can explain. These guides help you tell them apart using the two numbers every bill prints, kWh and days, before you spend anything.
Start with the high-bill diagnostic. It walks through:
- The lines to find on each bill: kWh used, billing days and the charges that rise with each kWh.
- Two worked examples with made-up bills: one where only the rate moved, and one where usage and the billing period both grew.
- A two-bill comparison that labels your change as price, billing period or usage. It cannot name an appliance, because no calculation can.
- Free checks before you buy anything, such as the everything-off meter test and a week of reading the meter yourself.
- When to call the utility, for example after estimated readings in a row or a rate change you did not agree to.
If you heat with gas or oil, keep that bill next to the electric one. Sealing drafts and changing the thermostat mostly show up there.
If you already know your usage went up, the electricity cost calculator turns a suspected appliance into a dollar figure you can check against the bill.