Measuring Energy Savings: M&V Mistakes to Avoid
The short answer
Savings are never measured directly — they're the difference between what you used and what you would have used without the project. Good measurement and verification (M&V) sets a clean baseline, adjusts for weather and production, isolates the project where possible, and separates usage savings from price changes. Skip those steps and a hot summer or a new contract price can make a good project look like a failure (or vice versa).
Five mistakes that distort savings
- Comparing bills, not usage. A new supply price or rider change can swamp a project's effect. Measure kWh and kW, then apply prices.
- No weather adjustment. Heating and cooling loads follow degree days; normalize before comparing years.
- Ignoring production or occupancy. A plant that added a shift will use more even after an efficiency upgrade — normalize per unit or per operating hour.
- Baseline too short. Use at least 12 months so every season is represented.
- Counting demand savings wrong. A project that lowers kWh may not lower peak kW (and vice versa). Track demand and capacity-tag effects separately.
The four IPMVP options, simply
| Option | Method | Good for |
|---|---|---|
| A — Key parameter | Measure one key value (e.g., fixture wattage), estimate the rest | Lighting retrofits |
| B — All parameters | Meter the retrofitted equipment directly | Motors, VFDs, chillers |
| C — Whole facility | Use utility meter data with regression for weather/production | Multiple measures in one building |
| D — Calibrated simulation | Energy model calibrated to data | New construction, complex projects |
(IPMVP is the International Performance Measurement and Verification Protocol, the common industry reference.)
Ohio-specific considerations
- No utility rebates to satisfy. Ohio's utilities don't currently offer general business efficiency rebates, so M&V serves your own decision-making and any financing (such as C-PACE) or customer reporting — keep it proportionate.
- Capacity savings show up a year later. Cutting load during PJM's summer peak hours lowers the capacity tag that takes effect the following June 1.
- Contract bandwidth. Big savings can push usage below your supply contract's bandwidth; tell your supplier before usage drops sharply.
FAQ
How do I prove energy savings to management?
Show kWh and kW before and after, adjusted for weather and production, then apply a constant price to separate usage savings from rate changes.
How long should the baseline be?
At least 12 months, ideally 24 for weather-sensitive loads.
Why did my bill go up after an efficiency project?
Usually because prices, riders or capacity costs rose at the same time — PJM capacity prices jumped more than tenfold between 2024/25 and 2026/27. Compare usage, not dollars.