Why Is Your Electric Bill So High? Bill Jump Calculator

Enter last month’s and this month’s bill and the tool splits the increase into weather, rate and usage with EIA degree-days and your own rate.

Updated September 2026 · Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

By SolarCostData Data Desk · Reviewed September 2026 · Corrections log

On this page: CalculatorTableHow we calculatedSources

Every state's rate, July 2025 vs July 2026

Rates: EIA Electric Power Monthly, Table 5.6.A (residential), July 2026 edition — the newest month EIA publishes per state, with the same month a year earlier for comparison.

How the split actually works

Enter kWh for both months and the tool divides dollars by kWh for each — your effective rate — so a rate change shows up as a real, bill-derived figure rather than a guess. It then pulls your region’s EIA heating and cooling degree-days for the same two months and estimates how much of the usage change those degree-days would explain, scaled by the heating/cooling equipment you named (electric resistance heat and central air respond hard to degree-days; a gas furnace barely touches the electric side). What’s left after removing the rate effect and the weather effect is the usage residual — attributable to how you actually lived that month, not how cold or expensive it was. The split closes exactly: rate piece plus volume pieces equals your whole increase, by identity, when both kWh are entered.

Skip kWh and the tool substitutes your state’s newest EIA figures instead of bill-derived ones. Those are honest but not current: state-level monthly rates are typically published with about a two-month lag, so the “newest” comparison EIA offers is July 2026 against July 2025 — shown in the table below — not necessarily the rate you were charged this cycle. The page states that vintage next to the number, because a rate estimate from two months back deserves less trust than one calculated from your own dollars and kWh.

What this tool cannot see

The three-way split covers weather, rate, and usage — a few real causes of a jump live outside all three. A fixed-charge increase (a higher customer fee, a new surcharge line) doesn’t move with kWh or rate, so it can only appear as an unexplained residual, not a labeled category — though when your effective rate moves while usage barely does, the tool flags that pattern for you. The same goes for a tariff or plan switch — moving onto a time-of-use or tiered structure changes how you’re billed, not just what rate applies, and this tool doesn’t model tariff structures. And no calculator can rule out a meter or billing error from the outside. If the split leaves a gap that doesn’t match your month, the fastest check is your utility’s own billing history page or a call asking for a line-by-line comparison of the two statements.

Frequently asked questions

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

Where to go next

• Electric vs gas heat cost — If the jump is winter heating on resistance strips, this is the per-MMBtu gap you are paying against gas or a heat pump.
• Average electric bill by house size — Is the bill even abnormal? Check it against RECS homes your size first.
• Find your rate by ZIP — Not sure what rate to compare against? Your utility’s EIA average, three clicks.
• Electricity rate tracker — Your state’s 24-month rate line — see whether this month’s move is a blip or a trend.
• Electricity cost calculator — If usage is the story — price what any single appliance adds at your rate.
• Cost to run 40 appliances — The ranked library behind the usage question, by wattage and hours.
• Winter heating costs — How degree-days become a heating bill, fuel by fuel.
• Time-of-use rate simulator — If the rate piece keeps recurring, test whether the plan itself is the problem.