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Last updated October 2026.
Why errors scale with the estate
A business with one meter can check its bill in ten minutes. A business with sixty meters across twenty sites, two suppliers and a mix of contract dates has six hundred invoices a year, and the error rate does not fall because there are more of them. Sites open and close, meters are swapped, tenants change, and every change is a chance for a supplier’s system to carry the wrong rate, the wrong meter class or the wrong VAT status forward.
Multi-site estates also tend to have the problems that are hardest to see from a single invoice: a site that was sold still being billed, a meter that was removed still carrying a standing charge, or two suppliers both billing a site after a switch.
Setting validation up to run continuously
Talk it through with us
Send us a recent bill or a quick description of your sites and we will tell you plainly what applies to you and what it would involve. No obligation.
Linking validation to procurement
The register that validation needs is the register that portfolio procurement needs. Validated consumption by meter is what a supplier prices; corrected meter classes and capacities are what keep standing charges right under the new contract; and aligned end dates are what let an estate be bought as one. Organisations that run validation and procurement separately often find the procurement team quoting on consumption the validation team knows is wrong.
Our multi-site business energy page covers the procurement side; business energy procurement covers strategy. The water equivalent, which has the same problems and often larger refunds, is handled by our sister business, The Business Water Shop.
Inspire Leisure
Four leisure sites, complex usage and a suspicion the historic billing wasn’t right. The audit evidenced the overcharges and recovered £110,000. Read the case study.
Frequently asked questions
How often should a multi-site business validate its energy invoices?
Monthly, as invoices arrive. Annual validation finds the same errors a year later, when some are outside the recovery window.
Can suppliers provide invoice data electronically?
Most can for multi-site customers, as spreadsheets or data files, and half-hourly consumption data where meters allow. Ask at contract stage.
What is a site and meter register?
A master list of every site, MPAN and MPRN, meter serial, contract reference, rate, date and tax status, maintained as the reference every invoice is validated against.
Should all our sites be on one supplier?
Often it simplifies validation and procurement, but not always; the quotes decide. Aligning contract end dates matters more than a single supplier.
How do we find sites we are still being billed for after selling them?
By reconciling every meter on every invoice against the register each month. Orphaned meters show up as invoices with no matching site.
Does Clearsight Energy run validation for multi-site customers?
Yes, as a continuous service alongside portfolio procurement.
Need help? Get in touch
Call us on 020 8036 5715, or email us, and we will take it from there.