Measurement, Verification, and Energy Monitoring
Why M&V matters
Savings are avoided energy use, not a meter reading - they must be verified. The recognized framework is the IPMVP (International Performance Measurement and Verification Protocol), with options: A (retrofit isolation, key parameters measured), B (retrofit isolation, all parameters measured), C (whole facility), and D (calibrated simulation). Bulgarian practice and financing (including ESCO contracts) rely on transparent M&V.
Core method
- Define the baseline period and conditions.
- Build an adjustment model (e.g., regression of consumption on degree-days or production).
- Measure post-installation consumption.
- Savings = adjusted baseline − post-retrofit consumption.
Monitoring concepts
Metering hierarchy, sub-metering of major end uses, data frequency, normalization, and uncertainty. Traps: comparing post-retrofit consumption to an unadjusted baseline (weather or occupancy changed); claiming savings from behavior alone without evidence; ignoring interactive effects; confusing measurement boundary with the billing meter.
Worked example
Baseline year: 500,000 kWh at 2,500 degree-days → 200 kWh/DD. Post year: 2,300 DD, consumption 420,000 kWh. Adjusted baseline = 200 × 2,300 = 460,000 kWh. Verified savings = 460,000 − 420,000 = 40,000 kWh - not the raw 80,000 kWh difference.
Rule of thumb
Always state the M&V option, boundary, baseline period, adjustment method, and uncertainty. A saving without a verified baseline is an opinion.