In our project we are not making an energy simulation so in this credit we are forced to use option 2. I have two concerns:
1. If I take the default value for green energy (8kWh per year) then it turns out that we have to buy more green energy than the office will actually use (based on old energy invoices). What can we do in that case? Can we buy 50% of the energy used by the office based on previous invoices (the tenant is already in the new building for a few months so we have some data from the new office and some from the old office)?
2. In the credit language (option 2) it says that we should use the default value of 8kWh per square foot per year or 0.75kWh per square meter per year - these are two different values, which one is correct?
You rely on LEEDuser. Can we rely on you?
LEEDuser is supported by our premium members, not by advertisers.
Go premium for
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5869 thumbs up
February 7, 2013 - 11:57 am
There is precedence for using the actual data to base your purchase on. You can't use the old invoices however, it would need to be post-construction consumption.
8 kWh/sf and 0.75 kWh/m2 are the same value give or take. Conversion is 10.764 sf/m2.
Adam Targowski
OwnerATsec
103 thumbs up
February 8, 2013 - 4:58 am
So to use the actual data we heve to wait until one year passes in the new office and then after this time buy 50% of the energy from green energy provider, did I understand it well?
Well the office area is 464m2 which gives us 4994,5sf. If I use the default value of 8kWh/sf I get 39956kWh per year. If I use the defaul value of 0.75kWh/m2 I get 348kWh per year. So there must be an error somewhere, maybe it should be the other way round - 8kWh/m2 and 0.75kWh/sf - then it's the same value.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5869 thumbs up
February 8, 2013 - 2:04 pm
Waiting for the full year would work or you could try to justify an extrapolation.
The 8 kWh/sf is right and you are right the math goes the other way, my mistake. So there would be 86.1 kWh/m2. I am not sure where the 0.75 comes from?