This report is an update of a previous report, Statewide Savings Projections from the Adoption of a Commercial Building Energy Code in Illinois, completed in September 2002. This updated version incorporates the most recent—as of the writing of this report—gas and electric rates into the analysis.

The results of this analysis suggest that adopting and enforcing a commercial building energy code throughout the state of Illinois could produce substantial energy and cost savings, while reducing emissions of greenhouse gases.