Step 1: Check whether it's an estimate
The single most common cause of bill spikes is a switch from estimated to actual meter readings. Look at your bill for notations like “estimated,” “E,” or “actual.”
How estimated billing causes spikes
When a utility can't read your meter (bad weather, access issues, reader shortage), they estimate your usage based on historical patterns. If your actual usage exceeds the estimates for several months, the next actual reading catches up all at once.
Example: Your utility estimated 800 kWh for three months when you actually used 1,100 kWh each month. When they finally read the meter, your bill includes the 900 kWh that was underestimated in previous months.
What to do
If the spike is catch-up from estimates, it's legitimate — you used the power. But you can request a payment plan to spread the catch-up cost over several months. Contact customer service and ask.
To prevent future estimate issues with traditional meters, ensure meter access is clear. With smart meters, this shouldn't happen since meters transmit readings automatically.
Step 2: Compare your rate to previous bills
Pull out the last 3-4 months of bills and compare your rate per kWh. This is on your bill's supply or generation section.
Variable rate changes
If you're on a variable-rate plan, your supplier can adjust rates monthly based on wholesale market prices. There's usually no advance notice required. During market spikes, variable rates can increase significantly.
If your rate jumped from 10¢/kWh to 15¢/kWh, that alone creates a 50% bill increase even with identical usage. Variable rate volatility is a feature, not a bug — but it surprises many customers.
Fixed rate shouldn't change
If you're on a fixed-rate plan, your rate should be locked for the contract term. If it changed mid-contract, that's a billing error or contract violation. Check your contract terms and contact your supplier.
Default service rate changes
If you're on your utility's default service (you haven't chosen a supplier), the default rate may have changed. In Pennsylvania, the Price to Compare updates periodically. Check your utility's website for recent rate changes.
➤Compare supplier ratesStep 3: Look at usage, not just cost
Separate the rate question from the usage question. Your bill shows kWh consumed. Compare this to previous months.
Seasonal factors
Heating and cooling are the largest electricity uses in most homes. Usage naturally swings with the seasons:
- Summer peaks: Air conditioning can double or triple usage during heat waves
- Winter peaks: Electric heat, heat pumps, and even gas furnaces (which use electric blowers and controls) spike usage
- Shoulder seasons: Spring and fall typically have lowest usage with minimal heating or cooling
Compare your current bill to the same month last year, not just last month. A January bill should be compared to last January, not last October.
Behavior changes
Think about what changed recently:
- More people home (remote work, guests, new baby)
- New appliances (especially space heaters, dehumidifiers, pool pumps)
- Holiday lighting or seasonal decorations
- Extended vacations away (should reduce usage, not increase)
- HVAC thermostat settings changed
Billing period length
Check the billing period dates. An extra-long billing period (35 days instead of 30) increases the bill proportionally. This occasionally happens when meter reading schedules shift.
Step 4: Check for appliance faults
Malfunctioning appliances can dramatically increase usage without obvious symptoms.
Common culprits
- Water heater: A failing element or thermostat can cause continuous heating cycles. Tank water heaters can also develop sediment that reduces efficiency.
- HVAC:Refrigerant leaks, dirty filters, or failing compressors make systems run constantly. A heat pump stuck in “emergency heat” mode uses far more electricity.
- Refrigerator/freezer: Worn door seals, dirty coils, or failing compressors cause constant running.
- Electric dryer: A blocked vent makes the dryer run much longer to dry clothes.
- Pool or well pumps: Can run continuously if pressure switches fail or timers malfunction.
Detection methods
Listen for appliances that never cycle off. Touch the exterior of your water heater — it should be warm, not hot. Check that refrigerators cycle (you should hear the compressor kick on and off). Verify heat pump mode settings on your thermostat.
If you have a smart meter, check for usage spikes during specific hours via your utility's online portal. Overnight usage spikes when you're asleep suggest a continuously running appliance.
Step 5: Investigate meter issues
Meter errors are rare with modern smart meters, but they happen. Traditional analog meters can fail in ways that cause high reads.
Signs of meter problems
- Usage drastically different from any historical pattern
- Meter reading increases while you're away for an extended period
- Reading doesn't match what you observe on the meter
- Dramatic change coincides with a meter swap or maintenance
Request a meter test
You have the right to request a meter accuracy test. Most utilities charge a small fee ($20-$50) that's refunded if the meter tests faulty. The utility removes the meter and tests it under controlled conditions.
Note: A meter can register high reads even when working correctly if there's electricity flowing that you don't realize (malfunctioning appliances, unauthorized connections).
Step 6: Check for external factors
Less common causes to consider:
Unauthorized connections
In multi-unit buildings, your meter might serve circuits you don't realize — common area lighting, a neighbor's outlet. This is a wiring issue for the building owner to resolve.
Electric vehicle charging
If you or a household member started charging an EV, usage increases significantly. A typical EV uses 10-15 kWh per hour of charging. Daily charging can add 300+ kWh per month.
Rate structure changes
Some utilities have adjusted rate structures or added new fees. This isn't a billing error — it's an approved rate change — but it can surprise customers who didn't notice the change announcement.
How to dispute your bill
If you've checked everything and still believe there's an error, you have recourse.
Step 1: Contact customer service
Call your supplier (for generation charges) or utility (for delivery charges). Explain specifically what you believe is wrong. Reference your contract terms, previous bills, or whatever supports your case.
Request a review and ask for a callback or written response. Get the representative's name and a case number.
Step 2: Put it in writing
If phone calls don't resolve the issue, send a written dispute. Include:
- Your account number and service address
- Specific bills or charges you're disputing
- What you believe is incorrect and why
- What resolution you're seeking
- Copies (not originals) of supporting documents
Send via certified mail or keep records of electronic submission.
Step 3: File a regulatory complaint
If the company doesn't resolve your dispute, file a formal complaint with your state's public utility commission. The commission has authority to investigate billing disputes, order refunds, and penalize companies for violations.
In Pennsylvania, file complaints with the PA Public Utility Commission. Other states have similar agencies (usually called “Public Utilities Commission,” “Public Service Commission,” or similar).
Payment during disputes
While disputing, pay the undisputed portion of your bill to avoid late fees or disconnection. Note that you're paying under protest and disputing the remaining amount. Most states prohibit disconnection while a formal complaint is pending.
Frequently asked questions
Is my electricity supplier responsible for my high bill?
It depends. If you're on a variable rate plan, the supplier can raise rates without notice — that's how variable rates work. If you're on a fixed rate, check your contract; the rate shouldn't change mid-term unless you agreed to it. If the spike is due to high usage rather than high rates, the supplier isn't responsible. Compare your rate per kWh to previous bills to determine whether rates or usage increased.
How do I know if my electric meter is faulty?
Signs of a faulty meter include usage readings that don't match your patterns, readings that increase when you're away, or readings that change dramatically with no change in behavior. You can request a meter test from your utility, usually for a small fee that's refunded if the meter is found faulty. Modern smart meters rarely malfunction, but it does happen.
What is an estimated bill and why does it cause spikes?
An estimated bill is based on your historical usage rather than an actual meter reading. If your real usage was higher than the estimate, the next actual read will show a catch-up spike that covers multiple billing periods. The spike isn't actually sudden — you were just underbilled previously. Check your bill for “estimated” or “E” notations next to the meter reading.
Can I dispute my electricity bill?
Yes. Start by contacting your supplier or utility's customer service. If they don't resolve the issue, file a formal complaint with your state's public utility commission. Document everything: bill copies, contract terms, meter readings, and correspondence. The utility commission has authority to investigate billing disputes and order corrections.
Why did my electricity bill double from last month?
A doubled bill typically comes from seasonal changes (extreme heat or cold requiring more heating/cooling), a switch from estimated to actual meter reading, a rate change on a variable plan, a longer billing period than usual, a malfunctioning appliance, or (rarely) a meter error. Work through each possibility systematically before assuming an error.
