Page 203 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Ener gy and Atmospher e 181

and

PGEBAE = 100 × GE (4.6.5)
BAEE if EAc1 Option 1 is not sought
PGEPB or PGEBAE must be greater than or equal to 35 for the two points (LEED 2009)
or one point (LEED 2.2) to be awarded in EAc6. Table 4.6.1 gives a summary of the
symbols and equations.
There is also technical guidance for adapting this credit to projects with district energy
systems on the USGBC Registered Project Tools page found at http://www.usgbc.org/
projecttools.

Symbol Description Comments Relevant Equations Restrictions
GE Annual amount Can be purchased
of green or traded
electricity from
off-site
BAEE Building annual Electrical energy BAEE = (CBECSE)(GFA) Use if EAc1
j
energy usage part of BAEC, the Option 1 is
of electricity building annual not sought
energy cost
method
PGEBAE Percent green Based on the Use if EAc1
=
electricity BAEC method PGEBAE 100 × GE Option 1 is
BAEE
based on the not sought
BAEE
REE Annual on-site Electrical energy
renewable portion of the
electrical annual on-site
energy renewable energy
provided (REC)
PDEE Annual Electrical energy Use if EAc1
proposed part of the Option 1 is
design proposed design sought
electrical energy model
energy (PDEM)
PBE Annual Electrical energy PBE = PDEE − REE Use if EAc1
proposed part of the Option 1 is
building proposed building sought
electrical performance (PBP)
performance
PGEPB Percent green Based on the Use if EAc1
GE
=
electricity proposed design PGEPB 100 × PBE or Option 1 is
based on the energy model sought
PBE (PDEM) GE
=
PGEPB 100 ×
−
PDEE REE
TABLE 4.6.1 Green Power Credit Summary of Symbols and Equations