Understanding Your Electricity Bill

Reading a typical residential electricity bill

Most residential electricity bills share a common structure, though formatting varies by utility. Understanding the components helps you know where your money goes and where you can potentially save.

A typical bill includes:

• Account information: Your name, address, account number, meter number
• Billing period: The dates covered by this bill
• Usage summary: How much electricity you used (in kWh)
• Rate information: Your generation rate and delivery rates
• Charge breakdown: Itemized list of all charges
• Amount due: Total you owe and when it's due
• Usage history: Comparison to previous months or the same month last year

The most important sections for understanding your costs are the usage summary and the charge breakdown. Everything else is supporting information.

Generation vs. delivery charges

This is the fundamental division in your electricity bill. Understanding it is key to knowing where you can save money.

Generation (supply) charges

Generation charges cover the cost of producing the electricity you use. Someone has to run a power plant, buy fuel, and feed electricity into the grid. That cost is passed to you as a generation or supply charge.

In deregulated electricity markets, you can choose who supplies your generation. Different suppliers charge different rates. When you “switch electricity companies,” you're switching your generation supplier. This is the portion of your bill you can shop for.

If you haven't chosen a supplier, you pay your utility's default generation rate. In Pennsylvania, this is called the Price to Compare. Other states use different terminology.

Delivery charges

Delivery charges cover getting electricity from power plants to your home. This includes:

• Transmission: Moving high-voltage electricity across long distances
• Distribution: The local poles, wires, transformers, and substations
• Customer charges: Meter reading, billing, customer service

Your local utility handles delivery. You don't choose your utility — it's determined by where you live. Delivery charges are regulated by your state's public utility commission.

Key insight: When you switch suppliers, delivery charges stay the same. Only the generation portion changes. If generation is 40% of your bill and you reduce your generation rate by 20%, your total bill drops by 8%.

kWh, demand, and how usage is measured

What is a kilowatt-hour (kWh)?

A kilowatt-hour is a unit of energy. It represents the energy used by a 1,000-watt device running for one hour.

Examples:

• A 100-watt light bulb running for 10 hours uses 1 kWh
• A 1,500-watt space heater running for 40 minutes uses 1 kWh
• A 50-watt laptop running for 20 hours uses 1 kWh

Your meter tracks how many kWh flow into your home. At the end of each billing period, your utility reads the meter and calculates how many kWh you used since the last reading.

How your bill is calculated

The basic formula for your energy charges is:

kWh used × rate per kWh = energy cost

If you used 1,000 kWh and your rate is 12¢/kWh, your energy cost is $120. This applies separately to generation and delivery components (though delivery often includes fixed charges too).

Demand charges (commercial accounts)

Most residential accounts don't have demand charges. But if you see “demand” on your bill, it measures your peak usage rate (kilowatts, not kilowatt-hours) during the billing period. Demand charges are common for commercial and industrial customers.

Common bill line items explained

Bills include various line items beyond the basic generation and delivery charges. Here's what the common ones mean:

Generation/supply charges

• Generation charge: The main charge for your electricity supply, calculated as kWh × rate
• Price to Compare (PTC):In Pennsylvania, your utility's default generation rate. If you're with a supplier, your bill shows your supplier's rate instead.
• Default service:Another term for utility-provided generation for customers who haven't chosen a supplier

Delivery/distribution charges

• Distribution charge:Your utility's cost for local delivery infrastructure
• Transmission charge: Cost for high-voltage transmission from plants to local substations
• Customer charge: A flat monthly fee for account maintenance, meter reading, and billing
• System improvement charge: Costs for infrastructure upgrades

Taxes, fees, and surcharges

• State tax: Sales tax on electricity (varies by state)
• Gross receipts tax:A tax on the utility's revenue, passed to customers
• Universal service fund: Contributions to programs that help low-income customers
• Nuclear decommissioning: Funds set aside to safely retire nuclear plants
• Renewable energy compliance: Costs for utilities to meet state renewable energy mandates

Reading the supply portion

The supply (generation) section of your bill shows where your electricity comes from and what you're paying for it.

If you're on default service

If you haven't chosen a competitive supplier, your bill shows your utility as the supplier with their default rate. In Pennsylvania, this is labeled as the Price to Compare.

If you have a competitive supplier

If you've chosen a supplier, your bill shows either:

• Consolidated billing:Your utility bill includes your supplier's charges. The supply section shows your supplier's name and rate, and the charge is included in the total.
• Dual billing: You receive two separate bills — one from your utility for delivery, one from your supplier for generation. This is less common but used by some suppliers.

Either way, the supply rate should match what you agreed to when you enrolled. If it doesn't, that's worth investigating.

Reading the delivery portion

The delivery portion covers your utility's charges for getting electricity to your home. These charges are regulated and don't change based on your supplier choice.

Fixed vs. variable delivery charges

Some delivery charges are fixed (the same every month regardless of usage):

• Customer charge
• Minimum bill amount

Other delivery charges vary with usage:

• Distribution charges per kWh
• Transmission charges per kWh

The mix of fixed and variable delivery charges affects how much your bill changes with usage. If your utility has high fixed charges, your bill won't drop as much when you reduce usage.

Rate schedules

Utilities publish rate schedules that detail exactly how delivery charges are calculated. These are public documents filed with your state's utility commission. If your bill's charges don't match the published schedule, you have grounds for a dispute.

How to spot billing errors

Billing errors happen. Knowing what to look for helps you catch them.

Common error types

• Wrong meter reading: If your usage seems dramatically different from normal without a clear reason (new appliance, weather extreme, extended vacation), the meter reading might be estimated or incorrect.
• Rate discrepancy:Your rate should match your contract. If you're on a 10¢/kWh fixed plan and your bill shows 12¢/kWh, something's wrong.
• Unexpected fees:Charges for services you didn't request, or fees that appeared without notice, warrant investigation.
• Wrong account: Especially in multi-unit buildings, bills sometimes go to the wrong account. Verify your meter number matches your unit.
• Billing period overlap:If you just moved or switched suppliers, check that billing periods don't overlap, causing double-billing for the same dates.

What to do if you find an error

1. Document everything. Keep copies of the bill in question, your contract, previous bills, and any relevant correspondence.
2. Contact your provider.For supply charges, contact your supplier. For delivery charges, contact your utility. Explain the specific discrepancy you've identified.
3. Request a meter test.If you suspect the meter is malfunctioning, you can request a test. Some utilities charge a fee that's refunded if the meter is faulty.
4. File a complaint if needed.If your provider doesn't resolve the issue, file a complaint with your state's public utility commission.

Prevention

The best way to catch errors quickly:

• Review your bill every month, even briefly
• Set up usage alerts if your utility offers them
• Compare current usage to the same month last year
• Keep records of your contract terms

Frequently asked questions

What is the difference between generation and delivery charges?

Generation (supply) charges cover the cost of producing the electricity you use. Delivery charges cover your utility's costs for transmitting and distributing that electricity to your home. In deregulated markets, you can shop for generation; delivery is handled by your utility at regulated rates.

What does kWh mean on my electricity bill?

kWh stands for kilowatt-hour, a unit of energy. One kWh is the energy used by a 1,000-watt device running for one hour. Your bill shows how many kWh you used during the billing period. Multiply kWh by your rate per kWh to get your energy cost.

What is the Price to Compare on my electricity bill?

In Pennsylvania and some other states, the Price to Compare is your utility's default generation rate — the rate you pay if you don't choose a competitive supplier. It's your benchmark for evaluating supplier offers. Any supplier rate below the PTC saves you money on the generation portion of your bill.

Why do I have two suppliers listed on my bill?

In deregulated markets with consolidated billing, your utility sends one bill that includes both delivery charges (from the utility) and generation charges (from your supplier). The supplier you chose handles generation; your utility handles delivery. It's one bill for two services.

How can I tell if there's an error on my electricity bill?

Look for: usage that doesn't match your patterns, rates that differ from your contract, fees you didn't expect, meter readings that seem wrong, or charges for periods when you weren't at the address. Compare current bills to previous ones and check against your contract terms.