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Bill spike calculator

Compare two electric bills and find the likely spike driver.

Enter the earlier bill and the high-bill month to compare kWh, total dollars, and all-in effective rate before chasing appliances or rate changes.

Electric bill

$226

Energy$142
Delivery$48.00
Fees$36.00

All-in rate

$0.246 per kWh

Best next check

Cooling hours

Compare two electric bills

Enter an earlier month and the high-bill month. The calculator checks whether the increase looks more like usage, rate, or fixed-charge pressure.

Bill change

$78.00

53% compared with the earlier bill.

Usage change

200 kWh

28% compared with the earlier month.

Current all-in rate

$0.246

Previous all-in rate was $0.206.

First diagnosis

Rate up

The bill rose from a mix of usage and all-in rate changes. Compare kWh first, then review delivery, fees, taxes, and rate plan changes.

Check the spike from another angle

FAQ

Short answers for search visitors and bill-checking moments.

How do I figure out why my electric bill spiked?

Compare the high bill with an earlier bill using kWh, total dollars, and the all-in cost per kWh. Usage spikes point toward appliances or weather. Rate spikes point toward supply, delivery, fees, or taxes.

What if my kWh barely changed but the bill increased?

That usually means the all-in rate changed. Check the supply rate, delivery charges, riders, fixed customer charges, taxes, estimated reads, and billing period length.

What if kWh increased faster than the bill?

Usage is probably the first place to investigate. Look at heating, cooling, water heating, EV charging, pool pumps, space heaters, and new appliances.