Ask a distribution utility how many transformers it operates and you will usually get three answers: one from GIS, one from the fixed-asset ledger, and one from the engineers who actually run the district. They rarely agree, and the gap between them is not a rounding error — differences of 20% or more are common once a network has grown informally for a decade.
That gap is not an administrative nuisance. It sets a ceiling on everything else. Loss studies allocate energy across feeders that are not configured the way the model says. Reliability figures divide outage minutes by customer counts nobody has verified. Investment plans reinforce sections that were reconductored two years ago and miss the ones quietly overloading.
Verification beats migration
The instinct is to fix this with a data migration: consolidate the systems, deduplicate the records, declare a golden source. But migrating three wrong registers produces one wrong register. The only way to establish what is on the network is to go and look — feeder by feeder, with the connectivity traced, not just the assets pinned.
Field verification is expensive if it is done as a one-off survey, because the result starts decaying the day the crews go home. It pays for itself when the register is wired into field operations, so that every connection job, every transformer swap and every reconfiguration updates the record as a side effect of the work order. That is the difference between a snapshot and a system of record.
What changes when the register is right
With a verified register, loss allocation becomes an engineering exercise instead of an argument. SAIDI and SAIFI become defensible because the customer base per feeder is known. And capital planning can finally be sequenced by measured effect rather than by which district complained loudest.
None of the technologies usually headlined in modernisation programmes — ADMS, automation, analytics — perform to specification on top of a register the utility does not trust. The register is not a data project bolted onto modernisation. It is the first work package.