![]() ![]() However, I was curious to see how the incremental energy efficiency improvements compounded over time. For instance, the DOE has determined that buildings built to Standard 90.1–2013, as compared with buildings built to Standard 90.1–2010, would result in national source energy savings of approximately 8.5 percent and site energy savings of approximately 7.6 percent of commercial building energy consumption. You may not be initially impressed by the incremental improvements from one edition of Standard 90.1 to the next. The DOE also estimates energy use intensity (EUI) in their comparative analyses. Though, it appears that the DOE has begun to assess relative energy cost savings, starting with the 2016 edition. Each subsequent DOE determination compares the current edition of Standard 90.1 to the most recent previous edition in terms of energy efficiency improvements related to both source energy and site energy.
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