What is the wholesale electricity cost contribution to a household bill?

It is the estimated cost of buying the electricity needed to supply the household, including any explicitly entered losses, shaping, hedging, imbalance, transaction, and other wholesale procurement adjustments.

Is the wholesale market price the same as the retail unit rate?

No. A retail unit rate also recovers non-wholesale costs such as networks, policy costs, supplier operations, risk allowances, margin, and VAT.

Why is there an Ofgem allowance mode?

Ofgem publishes a wholesale cost allowance methodology for the energy price cap. A verified allowance for the relevant cap period can be more representative than one current spot-market price.

Does the energy price cap limit my total annual bill?

No. It limits applicable unit rates and standing charges for covered default tariffs. The total paid still depends on actual consumption.

Does this calculator cover Northern Ireland?

No. It is intended for Great Britain: England, Scotland, and Wales.

Are current Ofgem rates built into the calculator?

No. Price-cap values are updated every three months and may vary by region, payment method, meter type, tariff, and period.

Wholesale Electricity Cost Calculator

Enter annual electricity use and either a wholesale market price or a verified wholesale allowance. The calculator estimates the annual wholesale contribution, its pence-per-kWh equivalent, and its share of the full electricity bill.

Calculation MethodAnnual Electricity ConsumptionTotal Annual Electricity BillInclude unit charges and standing charges. Use a VAT-consistent amount.Wholesale Electricity PriceUsed only in Market Estimate mode.Losses UpliftShaping and Hedging UpliftImbalance UpliftTransaction and Trading UpliftOther Wholesale AdjustmentOfgem Wholesale AllowanceUsed only in Ofgem Allowance mode. Enter a verified value for the applicable cap period.VAT TreatmentPrice-Cap Period or Source NoteOptional label shown in the result. It does not change the calculation.

Estimated Annual Wholesale Contribution

£238.95

Raw Wholesale Energy Value: £202.50
Combined Wholesale Uplift: £18.00
Estimated Monthly Wholesale Contribution: £19.91
Wholesale Component: £8.85
Wholesale Share of Annual Bill: £26.55
Estimated Non-Wholesale Remainder: £661.05

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The main result is estimated annual wholesale electricity contribution. Supporting results show monthly contribution, p/kWh, percentage of the full bill, non-wholesale remainder, raw energy value, and total uplift.

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How to Use This Calculator

Choose Market Estimate for a price in GBP/MWh. Enter only the wholesale uplifts you intend to include. Choose Ofgem Allowance when you have a verified allowance in p/kWh from the relevant price-cap workbook. Keep the wholesale input and annual bill on a consistent VAT basis.

Formula & Methodology

Market Estimate mode calculates annual consumption × GBP/MWh ÷ 1,000 and applies the combined entered wholesale uplifts. Ofgem Allowance mode calculates annual consumption × allowance p/kWh ÷ 100. The wholesale share equals annual wholesale contribution ÷ annual electricity bill × 100.

Example: £75/MWh and 2,700 kWh

At 2,700 kWh and £75/MWh, the raw wholesale energy value is £202.50. With a combined 18% uplift, the estimate is £238.95, equal to 8.85p/kWh. Against a £900 annual bill, the estimated share is 26.55%.

This is an explanatory estimate, not an official Ofgem model or supplier settlement calculation. A spot price does not reproduce a supplier's hedged purchasing strategy. Results can differ because of demand shape, losses, hedging periods, imbalance, transactions, reconciliation, region, meter type, payment method, VAT, tariff structure, and price-cap period.

Independent informational calculator for Great Britain. Not affiliated with or endorsed by Ofgem, the UK government, Elexon, National Energy System Operator, or an energy supplier. Verify current price-cap inputs with official Ofgem publications.

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Frequently Asked Questions

What is the wholesale electricity cost contribution to a household bill?: It is the estimated cost of buying the electricity needed to supply the household, including any explicitly entered losses, shaping, hedging, imbalance, transaction, and other wholesale procurement adjustments.
Is the wholesale market price the same as the retail unit rate?: No. A retail unit rate also recovers non-wholesale costs such as networks, policy costs, supplier operations, risk allowances, margin, and VAT.
Why is there an Ofgem allowance mode?: Ofgem publishes a wholesale cost allowance methodology for the energy price cap. A verified allowance for the relevant cap period can be more representative than one current spot-market price.
Does the energy price cap limit my total annual bill?: No. It limits applicable unit rates and standing charges for covered default tariffs. The total paid still depends on actual consumption.
Does this calculator cover Northern Ireland?: No. It is intended for Great Britain: England, Scotland, and Wales.
Are current Ofgem rates built into the calculator?: No. Price-cap values are updated every three months and may vary by region, payment method, meter type, tariff, and period.

Last updated 7/21/2026