Since energy costs can make up about 40% of building operating costs for commercial buildings, it is critically important to gauge the extent to which there are opportunities for energy savings. Seeing how a property stacks up against other buildings of the same type is an important component in making this assessment. But how do we compare energy efficiency of a property against others? First we have to define the characteristic that we want to measure. What are the key critical to quality (CTQ) energy efficiency measures that are most important to the individuals (property owners or management, business management, building occupants) who might have a vested interest in improving building energy efficiency?

1. Determining Critical to Quality Measures
Three typical types of CTQ measures are:
- The amount of energy consumed
- The cost of energy consumed
- The quantity of carbon emissions produced as a result of the energy consumed by the building
2. Normalization
CTQ measures need to be adjusted, or normalized, to account for the fact that every building is different. Building energy usage may vary as a result of building size, climate, number of occupants, hours of operation, and a number of other features.
3. Derive Key Performance Indicators
Key energy performance indicators are the specific measures that are used to compare energy performance for a property against that of other properties, and to trend the property’s performance over time. Performance indicators are derived by adjusting the Critical to Quality Measures with the appropriate normalization factor. Common performance indicators include: Read more …