The Energy Asset Scoring Tool uses source energy use intensity (EUI) as the basic metric to develop the energy asset score. Using source energy aligns the energy asset score with ENERGY STAR Portfolio Manager, which uses source energy as its basic metric.
The Energy Asset Scoring Tool also employs the national conversion factors used by Portfolio Manager. The source-site ratios shown in the table below are used to convert each kBtu of energy used on site into the total kBtu of equivalent source energy consumed:
National Conversion Factors*
| Source | Source-Site Ratio |
|---|---|
| Electricity | 3.14 |
| Gas | 1.05 |
| District Cooling | 1.00 |
| District Heating | 1.20 |
*From U.S. Environmental Protection Agency, Understanding Source and Site Energy.
View the Commercial Building Energy Asset Score: Program Overview and Technical Protocol for additional details regarding EUI and the Energy Asset Scoring Tool, or the energy asset score report guide, for information on how EUI is obtained using the Asset Scoring Tool.