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Advanced metering is the backbone of persistent performance. Whole-building meters for each energy source (electricity, gas, steam/district) capture total consumption and demand, while permanent sub-meters on major end uses—typically any load ≥ ~10% of total—provide the granularity to diagnose issues: simultaneous heating/cooling, drifting base loads, disabled economizers, or abnormal plug/process use. Interval logging (e.g., 15-minute) and remote access feed dashboards and fault detection/diagnostics so staff can act on alerts and verify corrections with before/after data. Monthly bills are too coarse and slow for effective management. Temporary meters remove visibility precisely when seasonal variations begin. Thermostat trends cannot quantify energy by end use. A durable metering architecture enables monitoring-based commissioning, supports demand response readiness, and supplies clean, exportable evidence for LEED documentation and long-term asset reporting while reducing OPEX through timely, data-driven maintenance.