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Why do some properties have the same score but different GHG emissions? Follow

The ENERGY STAR score is a measure of the energy efficiency of a property, not the CO2 emissions. The score is based on the total amount of energy consumed. While the energy consumed and emissions are related, they are not identical. The ENERGY STAR score is based on the thermal requirement (i.e. for heat and electricity) of a property, while property emissions are based on the fuel mix. By evaluating the total thermal requirement of the property at a national level, an individual property's score is not credited or penalized for the relative efficiency or the fuel mix of its utility provider. However, in order to quantify emissions, ENERGY STAR employs regional factors that reflect the fuels and technologies used to generate energy within each region.

For example, two properties that use 100% electricity and operate with equivalent thermal efficiencies will receive the same ENERGY STAR score. However, if one property is located in a region where electric production is dominated by coal plants while the other is situated in a region where electric production is dominated by hydroelectric power plants, then the two properties will generate different CO2 emissions. Similarly, a third property that uses the same amount of electricity, with the same property efficiency will receive the same ENERGY STAR score, even if they purchase green power directly from a renewable electric utility.

Improvements at your property that increase the energy efficiency will lower your carbon footprint. In addition, informed decisions about energy supply can lower your carbon footprint even further. However, purchasing cleaner energy supplies does not, in itself, lower the energy demand for your property or increase its efficiency. Therefore, properties should strive first to increase energy efficiency and then to decrease carbon emissions through the purchase of clean energy.

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