How does the Energy Savings Verification Calculator compute normalized savings?

The calculator divides reporting period kWh by the normalization factor to get adjusted reporting use, then subtracts that from baseline kWh. For example, with 50,000 kWh baseline, 46,000 kWh reporting, and 0.95 normalization factor: adjusted reporting = 46,000 ÷ 0.95 = 48,421 kWh, normalized savings = 50,000 - 48,421 = 1,579 kWh (3.2% savings).

What normalization factor should I use for weather adjustments?

For weather normalization, use the ratio of heating or cooling degree days: reporting period degree days ÷ baseline period degree days. If the reporting year was 5% colder than baseline, the factor would be approximately 1.05. A factor of 1.0 means no adjustment needed.

Why is the IPMVP important for energy savings verification?

IPMVP (International Performance Measurement and Verification Protocol) provides standardized methods to separate true efficiency gains from weather, production, and operational changes. Without it, a 5% reduction in degree days can make a flat-energy building appear to save 5%, when no real efficiency occurred. IPMVP Options B and C are recommended for contract-grade verification.

Energy Savings Verification Calculator

Baseline & Reporting Period

Baseline Period Energy Use

kWh

Baseline Period Days

days

Reporting Period Energy Use

kWh

Reporting Period Days

days

Normalization Factor (production index or degree-day ratio)

ratio

Use 1.0 for no adjustment. Values <1.0 indicate lower production/activity; >1.0 indicate higher.

Verification Results

Raw Savings (Unadjusted)

Energy Saved

4,000 kWh

Percent Savings

8.0%

Normalized Savings (Weather/Production Adjusted)

Energy Saved

4,000 kWh

Percent Savings

8.0%

Daily Rates

Period	Total (kWh)	Daily Avg (kWh/day)
Baseline	50,000	136.99
Reporting	46,000	126.03

Adjusted Reporting Use

46,000 kWh

= Reporting kWh ÷ Normalization Factor

Why This Matters

Without normalization, weather variations and production changes can mask real efficiency gains or create false savings claims. A 5% reduction in heating degree days alone can make a flat-energy building look like it saved 5%. The IPMVP (International Performance Measurement and Verification Protocol) exists to separate true efficiency improvements from operational and weather effects.

For contract-grade verification, use at least a 12-month baseline period and follow IPMVP Option B (retrofit isolation) or Option C (whole-building analysis). Find verification services on TUNA →

⚠️ Caveat

Without proper normalization, weather/production changes can mask or fabricate savings. Always compare periods with similar operational conditions. Recommend ≥12-month baseline and IPMVP Option B/C for contract-grade numbers. This tool provides a simplified check; formal M&V requires documented protocols and uncertainty analysis.