1.2 Problem Statement
Although the LEED Certification system was developed based on the consideration of reducing
environmental impacts, it is also shown that economic aspect can be reflected since the energy
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consumption is directly related to the energy cost. Especially, the points on EA credit 1, which
intends to achieve increased energy performance above the baseline in the prerequisite
standard to reduce environmental and economic impacts associated with excessive energy use,
estimate the degree of improvement to reduce energy costs (USGBC, 2009). Table 1.1 shows a
percent improvement in the proposed building performance rating compared with the baseline
building performance rating per ASHRAE Standard 90.1-2004 by a whole building project
simulation using the BPR method in Appendix G of the Standard.