Why did my electric bill go up?
Official sources checked September 7, 2026
These official sources support the information in this guide.
Start with the bill, not a guess
A higher amount due can come from more electricity use, different prices, or other account charges. Get this bill and the previous one. If available, also get the bill covering the same season last year.
This checklist helps you narrow the question. It cannot identify a faulty appliance or confirm a billing error. Keep your bills with you; no upload or account number is needed here.
1. Separate this month’s charges from the balance due
Look for current charges, previous balance, payments and credits. A payment that has not posted or an unpaid balance can make the amount due different from this month’s electricity cost. SRP’s bill explanation shows where those items appear.
On Budget Billing? Your monthly payment is a different figure from the cost of that month’s usage. APS reviews its payment amount against usage history; check its Budget Billing explanation and your account balance before interpreting a payment change as a sudden usage spike.
2. Compare electricity use per day
Find total kilowatt-hours (kWh), the amount of electricity measured over the billing period, and the number of billing days. Divide kWh by days. Use the same usage line on both bills. SRP includes daily-use comparisons on its bill.
Example: more total use, the same daily use
Previous bill: 900 kWh ÷ 30 days = 30 kWh a day.
New bill: 990 kWh ÷ 33 days = 30 kWh a day.
Total use rose 10%, but daily use did not rise. The extra three days explain the extra 90 kWh in this made-up example. They do not explain every dollar on a real bill.
If daily use increased: note when it started. Compare those dates with hotter or colder weather, guests, thermostat changes, EV charging or longer pool-pump runs. Use your utility’s daily or hourly usage view if available. These are clues to investigate, not a diagnosis.
SRP’s high-usage guidance explains why an alert does not by itself mean an appliance is broken. Keep essential cooling and medical equipment operating while you investigate.
Have solar? Electricity delivered by the utility is not necessarily your home’s total use: some solar power may be used directly at home. Keep delivered electricity, exported electricity and solar production separate. SRP’s solar bill sections explain those distinctions.
3. If use does not explain it, compare prices and other lines
- Plan and season: did the plan name or the prices shown on the bill change? Match the exact plan, not just the utility name. APS provides sample guides for different bill types.
- Time of use: on a plan with different hourly prices, check whether more kWh fell in an expensive period. See our APS hours guide or SRP plan schedules.
- Demand, if your plan bills for it: compare the billed kilowatts (kW) and demand charge separately from kWh. The measurement rules depend on the plan. Our SRP E-27 explanation applies specifically to E-27.
- Adjustments, fees and credits: compare each changed line. APS’s adjustor guide explains charges beyond the base energy price. A smaller credit can also increase the net amount you owe.
Dividing the whole amount due by kWh does not reveal a clean electricity rate if that amount includes an old balance or other charges. Use the bill’s line items to ask a more precise question.
4. Leave with one specific next step
Write down the following before contacting the number on your bill. These are our suggested questions; your utility must confirm the account details.
- “These are my two billing periods and daily-use figures. What explains the change?”
- “Which price, charge or credit changed, and from what date?”
- “Was either bill estimated or corrected? Can you explain the meter readings?”
- “If usage still looks unusual, what usage review or home assessment is available, and does it cost anything?”
Cannot afford the bill while sorting this out? Use our Arizona payment-help guide. Asking for a bill review does not itself confirm a payment extension.
For TEP, UniSource, cooperatives or another provider, use this comparison method with that provider’s bill guide. APS and SRP examples do not establish another utility’s rules.
Common questions
Can my bill rise even if I use less electricity?
Yes. Check the prices applied to your usage, the time periods in which you used it, any demand charge, and other charges or credits. Compare current electricity charges separately from an old balance or a budget-payment amount.
Should I compare this month with last month or last year?
Use both if you have them. Compare electricity use per billing day first. The same period last year adds seasonal context, but weather, occupancy and equipment may have changed. Neither comparison alone proves the cause.
Does a high-usage alert mean an appliance is broken?
No. SRP explains that changes such as guests and extra appliance use can trigger an alert. Check the timing and your household routine before assuming equipment has failed.
Official explanations checked September 7, 2026. The checklist and worked example are AZ Energy Hub’s editorial guidance; no new tariff rates or promised savings are modeled. References and check dates are recorded in our source ledger.