The Challenge
A facility reported energy consumption in sustainability reports based on 8 sub-meters. During an audit, the auditor questioned whether meters were certified and within accuracy tolerance. The facility had no calibration documentation — meters were never formally calibrated.
What Became Visible
The audit revealed that uncertified meters are not acceptable for official energy reporting. Meter accuracy has tolerance (typically ±2%), and meters must be recertified annually or bi-annually per standards. The facility's meters had no calibration history. Energy consumption data, while operationally useful, was not audit-valid.
What Changed
All 8 sub-meters calibrated against certified reference standards. Meters certified to ISO/IEC 62053 (electricity meters) and ISO 6762 (water meters) standards. Calibration certificates issued. Annual recalibration schedule implemented.
How it worked: Third-party calibration service was contracted. Each meter was removed, tested against traceable references, adjusted if needed, and recertified. Calibration certificates documented accuracy, tolerance, and recalibration schedule. Annual maintenance calendar was set to recertify meters before expiry.
Results
ISO/IEC compliant
certified measurement
documented and certified
traceable measurement
Energy consumption reporting requires certified meters with documented calibration. Uncertified meters invalidate energy reports regardless of accuracy.
Operational Reality
Most facilities operating without meter certification don't realize their energy data is not audit-valid. Certification is routine but essential.