M&V Option C, also known as the Whole Facility Approach, is one of the approaches that involves analyzing the total energy consumption of a facility to determine the savings achieved by adopting some energy conservation measures. Option C is particularly suited for projects where it is difficult to isolate the impact of individual energy conservation measures (ECMs). Key features:
 

Baseline Development

This involves analyzing historical energy consumption data before the retrofit to develop a baseline that accurately represents the facility’s overall consumption trend prior to the retrofit. Additionally, it includes assessing the independent variables that can affect the facility's energy consumption or demand
 

Data Collection

The primary data source for Option C is utility meter readings. Meters shall always be calibrated and monitored to ensure accurate energy data
 

Independent Variables

Independent variables include factors that influence facility energy consumption or demand. These variables will be systematically incorporated to determine the periodic adjustment of the baseline during the reporting period
 

Routine Adjustments

Mathematical models (e.g., regression) enable baseline adjustments based on relevant independent variables. Baseline adjustment is required for energy savings calculation

Non-Routine Adjustments

Refer to adjustments made to the baseline energy consumption to account for significant, unexpected changes that affect energy usage. Unlike routine adjustments, which address predictable and recurring variations, non-routine adjustments are necessary for changes that are irregular and not part of normal operations
 

Energy Savings Calculation

 
Baseline Energy Consumption ± Routine Adj. ± Non−Rotuine Adj. − Reporting Energy Consumtpion "Baseline Energy Consumption " ("±" )" Routine Adj. " ("±" )" Non-Rotuine Adj. " ("-" )" Reporting Energy Consumtpion "