Validate Past Charges
Cross-check a supplier invoice against independently calculated charges and surface any overcharge, line by line.
For energy consultants, bill auditors and procurement teams validating network charge invoices.
Try Validate Past ChargesDUoS overcharge identified
Red-band and Capacity rates do not match the 2024-25 DNO schedule
recoverable · 5.8% above correct total
| Charge | Invoiced | Should be | Variance |
|---|---|---|---|
| DUoS (distribution) | £5,168 | £4,095 | -£1,073 |
| TNUoS (transmission) | £3,240 | £3,240 | £0 |
| BSUoS (balancing) | £812 | £812 | £0 |
| CCL (climate levy) | £9,687 | £9,687 | £0 |
| CfD levy | £284 | £284 | £0 |
| Capacity Market | £178 | £178 | £0 |
| Nuclear RAB levy | £92 | £92 | £0 |
| AAHEDC | £137 | £137 | £0 |
| Total | £19,598 | £18,525 | -£1,073 |
The journey
Four steps, one audit
From invoice figures to a line-by-line variance, with every rate traced to the official source.
Enter
Enter MPAN and billing details
Type the MPAN, billing period start and end dates, and the period consumption split by time band. No half-hourly data file required: Red, Amber and Green totals are enough to recalculate every charge.
Identify
Decode the supply point
We decode the MPAN into its DNO region, voltage, profile class and tariff category, then lock in the correct charging year. Every rate is sourced from the schedule that applies to this specific site and period.
Recalculate
Recalculate every charge from official rates
DUoS unit rates, capacity and fixed charges, TNUoS TDR, BSUoS, CCL, CfD levy, Capacity Market, Nuclear RAB and AAHEDC: every component is recalculated from published rate schedules, independent of the supplier calculation.
DUoS breakdown · HV HH Metered · East Midlands
Compare
See invoiced against calculated, line by line
Every charge component shown side by side: what the supplier invoiced, what the correct figure is, and the variance. Overcharges are flagged immediately so you have the evidence to raise a dispute.
DUoS overcharge identified
Red-band and Capacity rates do not match the 2024-25 DNO schedule
recoverable · 5.8% above correct total
| Charge | Invoiced | Should be | Variance |
|---|---|---|---|
| DUoS (distribution) | £5,168 | £4,095 | -£1,073 |
| TNUoS (transmission) | £3,240 | £3,240 | £0 |
| BSUoS (balancing) | £812 | £812 | £0 |
| CCL (climate levy) | £9,687 | £9,687 | £0 |
| CfD levy | £284 | £284 | £0 |
| Capacity Market | £178 | £178 | £0 |
| Nuclear RAB levy | £92 | £92 | £0 |
| AAHEDC | £137 | £137 | £0 |
| Total | £19,598 | £18,525 | -£1,073 |
The problem
Your supplier's calculations might be wrong
Electricity bills are complex, and billing errors are more common than you'd expect. Wrong tariff codes, incorrect consumption allocations, or outdated rates can mean your clients have overpaid without knowing it. The problem is, validating a bill requires the same data and methodology the supplier used.
Without independent validation, your clients' billing errors go undetected. Over a typical 6-year limitation period, even small errors compound into significant overcharges - and recovered overcharges are revenue for your practice.
Why it matters
What you walk away with
Independent Charge Calculation
Calculate what you should have paid using official published rates and methodologies.
Variance Analysis
See exactly where your bill differs from the calculated charges, line by line.
Full Audit Trail
Every calculation includes the rates, formulas, and data sources used - ready for supplier disputes.
Built on official published rates
FAQ
Answers, before you ask
We have rate data from 2022 onwards for all DNO regions. For earlier periods, coverage varies by region.
Still curious? Email [email protected]
Find what you should have paid.
Independent charge calculations against every supplier invoice, with full rate audit trail and dispute-ready output.