Validate Past Charges
Compare supplier invoices against independently calculated charges. Find billing errors, recover overcharges, and ensure your clients are paying the correct amounts.
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 Wrong tariff codes, incorrect consumption allocations, or outdated rates can mean your clients have overpaid without knowing it.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.
Use Cases
When to use this tool
Routine Bill Audits
Regularly validate client bills to catch errors before they accumulate over time.
Suspected Overcharges
When a bill looks wrong, calculate what it should have been and quantify the discrepancy.
New Supplier Onboarding
Verify the first few bills from a new supplier to ensure they've set up the account correctly.
Portfolio-Wide Validation
Audit multiple sites systematically to identify patterns of billing errors across a portfolio.
Dispute Evidence Gathering
Build a watertight case for billing disputes with full calculation methodology.
How It Works
Enter your MPAN
We decode the DNO region and tariff
Set billing period
Select dates to validate
Enter consumption
Total or time band breakdown
Compare results
Review calculated vs invoiced
What You'll Get
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 data
We calculate using the same published rates DNOs use
Quick Answers
“How far back can I validate?”
We have rate data from 2022 onwards for all DNO regions. For earlier periods, coverage varies by region.