Two parts of the delivery system
Transmission lines move electricity between generation and major load areas, while local distribution equipment serves individual premises. Substations and transformers connect stages operating at different voltages. The precise ownership and billing arrangements vary, so a line labeled delivery on one utility’s bill may not match another bill’s grouping. Start with the tariff definitions and supplier component schedule. Physical functions and commercial invoice categories are related, but they are not always divided in the same place.
Charges can use more than energy consumption
Network tariffs may include customer charges, kWh-based charges, kW demand charges, riders, minimums, or other class-specific calculations. A business with low monthly kWh can still create a substantial peak load. Depending on the tariff, that demand can materially influence delivery cost. Do not estimate every network cost by multiplying a single cents-per-kWh figure by annual consumption. Use the actual rate schedule and measured billing determinants, including any look-back or seasonal provisions.
Why a supply offer may exclude network changes
Competitive suppliers cannot generally promise that the distribution utility’s tariff will remain unchanged throughout a supply term. Transmission treatment also varies: a contract may include a defined component, pass through a charge, or reserve an adjustment right. Read the allocation directly. If a delivery increase appears after a supplier switch, the timing alone does not prove that switching caused it. Reconcile tariff effective dates and usage before attributing the increase to the commodity agreement.
Hypothetical delivery-cost calculation
Assume an illustrative tariff has a $50 monthly customer charge, $0.020/kWh distribution charge, and $10/kW demand charge. At 10,000 kWh and 80 kW of billed demand, the modeled subtotal is $50 + $200 + $800 = $1,050. Cutting consumption by 1,000 kWh saves only $20 of the specified kWh component if demand stays unchanged. An operational project that lowers the measured peak could have a different effect. Real tariffs can include additional riders, ratchets, taxes, and minimums.
Practical review checklist
- Read the applicable tariff and identify customer, energy, demand, adjustment, and minimum charges.
- Map transmission treatment separately in the supplier contract to avoid assuming every network cost is fixed.
- Use measured demand and billing determinants when estimating delivery costs or efficiency savings.
- Compare service periods and tariff changes before assigning a delivery increase to a supply switch.
Questions & answers
Can a supplier eliminate utility distribution charges?
Ordinary competitive supply does not eliminate the utility’s applicable delivery tariff.
Are transmission charges always on the utility bill?
No. Billing presentation and cost allocation vary; check both the utility tariff and supplier agreement.
Sources & scope
Primary references reviewed October 15, 2026. These sources support the stated concepts; actual tariffs, program rules and signed agreements govern the account. Decision examples and operational worksheets are original educational analysis.
- EIA: Delivery of electricity to consumers
Physical grid, transmission, distribution, and provider roles. - DOE FEMP: Evaluating your utility rate options
Demand, ratchets, time-of-use rates, coincident peaks, and standby charges. - EIA: Electricity prices and factors affecting prices
Fuel, weather, generation, grid costs, and retail rate differences.