Forum discussion

CS-2009 EAc6:Green Power

Determining Core & Shell electricity usage from Energy Model

Based on the comments a few people have written in this forum since early in 2014, it sounds as though the core and shell electricity use must be broken out in the energy model and that the 15% "only applies to the CBECS method and is not used at all if you do an energy model." (Of course the 15% is the minimum if the USF is too high.) However, the LEED credit language still reads: "The core and shell building’s electricity is defined as the electricity usage of the core and shell square footage, as defined by the Building Owners and Managers Association (BOMA) Standards, but not less than 15% of the building total gross square footage." and then after that it breaks down in to the two options: "Option 1. Determine baseline electricity use: Use the annual electricity consumption from the results of EA Credit 1: Optimize Energy Performance." I can't find any LEED Interpretations or Addenda that say the GSF/USF equation doesn't apply to CS projects that do an energy model. So was this really changed? Or was it an oversight on the part of a LEED Reviewer / or LEED Support person?

1

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Sun, 11/02/2014 - 23:58

No change in enforcement. It has always been enforced this way in the review process.

Wed, 02/04/2015 - 15:49

I think that I have not been providing the correct advice on this issue. Let me try again. It appears that the 15% rule can be applied to both Options. Option 1 - If you are not using the threshold adjustment calculator then use the actual area of CS space or 15% which ever is greater. Multiply this percentage ties the total electric consumption and buy 35% for two years. If using the threshold adjustment calculator then the owner controlled and owner influenced electric consumption should be used which would be a higher amount of electricity than the simple area method. Option 2 - 15% is again the minimum or use the actual area if greater. You cannot use this method if you have done an energy model for EAp2. Hopefully I have it right this time.

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