855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 177
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guidance. Calculate the PI and percentage improvement with and without the plug and process savings.
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Calculate the PI and performance index target (PIt) as follows:
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PInre = PBPnre / BBP
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PI = PBP / BBP
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PIt = [BBUE + (BPF x BBRE)] / BBP where :
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o PInre = PI for future source energy excluding on-site renewable contribution
o PI = PI for future source energy including on-site renewable contribution
o PIt = performance index target for future source energy use
o BBP = baseline building performance for baseline building future source
energy use
o BBUE = baseline building unregulated future source energy use
o BBRE = baseline building regulated future source energy use
o PBPnre = proposed building performance without any credit for reduced
annual future source energy from on-site renewable energy generation systems
o PBP = proposed building performance, including the reduced annual future
source energy associated with all on-site renewable energy generation systems
Points are awarded according to Table 6, using either Path 1 or Path 2.
Table 6. Points for percentage improvement in PI below PIt
| Path 1. Percentage reduction excluding on-site renewable contribution (100%–PI / PI) nre t | OR | Path 2. Percentage reduction excluding on-site renewable contribution (100%–PI / PI) t | Points |
|---|---|---|---|
0% | 5% | 2 | |
2% | 2% | 10% | 3 |
4% | 4% | 20% | 4 |
6% | 6% | 30% | 5 |
8% | 8% | 40% | 6 |
10% | 10% | 50% | 7 |
12% | 12% | 60% | 8 |
14% | 14% | 70% | 9 |
16% | 16% | 80% | 10 |
18% | 18% | 90% | 11 |
20% | 20% | 100% | 12 |
U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 166