The Basics: kWh Explained
Your electricity is measured in kilowatt-hours (kWh). One kWh is the energy used by a 1,000-watt appliance running for one hour — or a 100-watt light bulb running for 10 hours. The average US home uses about 877 kWh per month. Your bill multiplies your kWh usage by your rate per kWh to get your energy charge.
Anatomy of a Typical Electric Bill
Account and Meter Information
Your bill will show your account number, service address, billing period (usually 28–35 days), meter read dates, and meter readings (start and end). The difference between start and end readings is your usage in kWh.
Generation Charges
Also called "supply" or "energy" charges, this covers the actual electricity you consumed. It's typically the largest line item. If your state is deregulated, you may see a separate charge from your chosen supplier vs. your local utility.
Distribution Charges
This covers the cost of delivering electricity to your home through the local grid — poles, wires, transformers, substations. It includes a fixed customer charge (typically $5–$20/month regardless of usage) plus a variable charge per kWh.
Transmission Charges
Separate from distribution, this covers moving bulk electricity from power plants to local substations. It's often a smaller per-kWh charge rolled into the total rate.
Demand Charges
Common on commercial and some large residential bills. Demand charges are based on your peak demand (highest kW draw in any 15-minute window during the billing period) rather than total consumption. A single event — like starting your HVAC on a hot afternoon — can set your demand charge for the entire month. Some residential TOU plans now include demand components.
Tiered Pricing
California and some other states use tiered pricing where the rate increases as you use more. A typical structure: Tier 1 (first 400 kWh) at 25¢/kWh, Tier 2 (next 400 kWh) at 33¢/kWh, Tier 3 (above 800 kWh) at 45¢/kWh. Your marginal cost of electricity is what matters for efficiency decisions.
Net Metering Credit
If you have solar panels, excess generation exported to the grid appears as a credit on your bill. Understand your utility's net metering rate (it may be lower than the retail rate you pay for consumption).
Common Billing Errors
Meter Misread
Meter readers (human or automated) make mistakes. If your usage looks dramatically higher than usual with no change in your lifestyle, compare your actual meter reading to what's on your bill. Access your meter and read it yourself — the reading should match within a few kWh of what your bill shows.
Wrong Rate Class
Utilities offer multiple rate schedules — residential, commercial, time-of-use, special programs. If you've been accidentally assigned a commercial rate or a rate intended for a different usage profile, you could be overpaying. Call your utility to confirm you're on the correct rate schedule.
Applied Wrong Period
When billing periods are longer than 30 days (sometimes 35 days), it can look like a high usage month. Check the number of days in your billing period before concluding your usage has spiked.
How to Dispute a Bill
If you believe your bill is wrong:
- Read your meter and compare to the bill
- Call your utility's customer service with your meter reading
- Request a "meter test" if you believe the meter is faulty (utilities are required to test it, usually at no charge for the first request)
- If unresolved, file a complaint with your state Public Utilities Commission
You have the right to dispute bills and withhold the disputed amount (not the total bill) in most states while a formal dispute is under investigation.