Private in-browser planning
Commercial Electricity Bill Component Estimator
Starting values are hypothetical. Replace them with your own figures. Inputs stay in this browser and are not included in the energy inquiry.
- A component sum, not a full tariff engine. Replace hypothetical starting inputs.
- Enter billed demand; taxes and riders are explicit dollar inputs.
Read the bill by quantity and unit
Energy charges typically use kWh, demand charges use a power quantity such as kW, and customer charges may be fixed dollar amounts. Copy each rate together with its unit and identify whether it applies to the same billing period. A cents-per-kWh figure must be divided by one hundred before entering dollars per kWh. For example, 8 cents is $0.08.
Use billed demand for the demand line, which can differ from measured peak because of tariff rules. If the bill has multiple demand windows, kVA adjustments, tiers or time-of-use energy rates, this single-component layout will not reproduce it exactly. Calculate those components separately or use a detailed tariff worksheet rather than force them into a misleading average.
The component calculation
Supply charge equals period kWh multiplied by supply dollars per kWh. Usage-based delivery equals the same kWh multiplied by the delivery rate. Demand charge equals billed kW multiplied by dollars per kW. Add fixed customer charges and stated other charges, including any taxes or riders deliberately entered as dollar amounts.
For illustration, 10,000 kWh at $0.08 supply and $0.03 delivery produce $800 and $300. Billed demand of 50 kW at $12 adds $600. With a $50 customer charge and $100 other charges, the modeled total is $1,850. Effective total cost is $0.185 per kWh, substantially different from the $0.08 supply rate because it includes more components.
Avoid double counting and omitted charges
Inspect whether a quoted supply rate already includes a fee or pass-through that also appears in your other-charges estimate. Do not count it twice. Conversely, a supplier commodity rate alone may leave out delivery, demand, riders and tax. The estimator makes those omissions visible only when the missing amounts are entered; it cannot discover them from the account address.
Taxes and riders may have their own calculation bases. This tool accepts their stated or separately estimated dollar amounts rather than assuming every component has one uniform tax percentage. Minimum bills, bill credits, prior balances and late charges also require careful treatment. Keep nonrecurring payment adjustments separate when the purpose is to estimate recurring energy spending.
Use effective cost for the right question
Total bill divided by kWh is an effective cost ratio, not necessarily a supplier price. Low consumption can raise that ratio because fixed and demand charges are spread over fewer kWh. A changed ratio may reflect consumption shape, tariff components or taxes rather than a change in the energy rate itself. At zero kWh, the tool shows component costs but does not define a per-kWh ratio.
Use the results to ask which component deserves attention. Compare supply offers on equivalent included scope; investigate demand with interval data and the applicable tariff; reconcile unexplained charges with the utility. Keep the original bill and calculation assumptions together. This page does not guarantee a future bill, establish account eligibility or replace the current rate schedule for exact billing.
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.
- DOE FEMP: Evaluating Your Utility Rate Options
Energy charges, demand charges, fixed charges and tariff structures; practical limits of simplified rate calculations.