ELECTRICITY, EXPLAINED

Electricity supply vs. delivery charges

BillMellow editorial · Updated October 25, 2026

Supply and delivery describe different parts of an electric bill. Supply is associated with the electricity purchased for your use. Delivery covers getting electricity through the network to customers. The exact labels, rate design and line items depend on your provider and service territory.

For a cost calculation, classify charges by how they are billed: usage-based charges belong in the variable rate; recurring flat charges belong in monthly fees. Do not assume every delivery charge is variable or every fee can be avoided by switching suppliers.

What is an electricity supply charge?

A bill may call this energy, generation, supply or another provider-specific term. Look for the pricing document referenced by your plan. If a charge is a stated dollar amount per kWh, multiply that rate by the kWh to which it applies.

In an illustrative flat-rate example, 600 kWh at a supply price of $0.10/kWh produces a $60 supply charge. That does not establish the full bill. Delivery charges, recurring fees, taxes and credits may still be added.

Availability of supplier choice depends on location. A state-level company match does not prove that a particular offer serves your exact address. Confirm service eligibility and current contract terms directly with the provider.

Why can delivery include both variable and fixed charges?

A pricing document may have a delivery amount per kWh and a separate customer or service charge per month. Treat those according to their units. The same bill category can contain more than one calculation method.

For example, a $0.05/kWh delivery charge on 600 kWh is $30. A separate $15 monthly charge remains $15 in that scenario. The combined variable cost is $0.10 + $0.05 = $0.15/kWh, while the monthly fixed cost is $15.

The illustrative total before taxes and credits is 600 × $0.15 + $15 = $105. Enter $0.15 as the combined variable rate and $15 as the fixed monthly charge in our electricity plan comparison.

All-in average cost is a different number

Divide that $105 total by 600 kWh and the all-in average is $0.175/kWh, or 17.5 cents. It includes the $15 fixed charge spread across those 600 kWh. The variable rate is still $0.15/kWh in this example.

At 300 kWh with the same rates and fee, the total is $60 and the average is $0.20/kWh. The average increased because the fixed fee is spread over less usage; the stated variable rate did not increase.

For the cost of an extra appliance hour, a variable rate may be more relevant than the historical all-in average. Tiered and time-of-use plans need additional care because the price of the extra use can depend on when and where it falls.

Avoid adding the same charge twice

An advertised average price at 1,000 kWh may already include delivery fees or a credit. It is not automatically a bare energy rate. Before combining two amounts, identify exactly what each includes.

1. Read whether the quoted price is a component rate or an all-in example.
2. Identify the usage level and billing period assumed.
3. Separate variable charges, flat charges and conditional credits.
4. Check taxes, minimum bills, contract terms and cancellation costs.

The simple two-plan tool models one combined variable rate, one monthly fee and one credit threshold per plan. It cannot reproduce every term of a complex tariff. Read how to compare electricity plans before treating a low advertised rate as a saving.

Where these charges go in the bill comparison

Copy usage-based supply into the supply field and usage-based delivery into its own field. Put flat delivery or customer fees under fixed charges. Enter taxes and other charges separately, and credits as a positive amount to subtract. Check that the total matches your bill before comparing two months.

If the bill does not clearly separate the amounts, ask the provider for the applicable breakdown. Do not invent a component rate from a state average. Our high electric bill checklist shows the next steps once the charges are classified.

Background on generation and network costs: US EIA electricity price factors. Labels and applicability must be verified against your own plan. All numerical examples are illustrative.

Keep exploring

• Why is my electric bill so high?
• kW vs. kWh: what is the difference?
• How much does a 1,500-watt space heater cost to run?

All electricity guides · Calculation methods and data limits