ID#5949 made on
EAc2.1-2.3 - Renewable energy
LEED BD+C: New Construction
This inquiry pertains to a core-and-shell project with a modeled base load of 530,350 kWh/yr. (ASHRAE ECB model). The base load includes corridor and lobby lighting and HVAC, and elevator loads,...
This inquiry pertains to a core-and-shell project with a modeled base load of 530,350 kWh/yr. (ASHRAE ECB model). The base load includes corridor and lobby lighting and HVAC, and elevator loads, all of which will be supplied by the building owner to the building occupants. The project includes building-integrated and roof-mounted photovoltaics which will generate approximately 21,600 kwh/yr, about 4 percent of the base load. According to the Point Interpolation Table (Table 8) on page 144 of the LEED reference manual, this is within the range to qualify for 1 LEED point under EA Credit 2.1. When we exclude non-regulated loads (elevators) from our model for Energy Credit 1, the base load is even lower and the resulting percentage from the PVs is even higher. As this is a core-and-shell project, we seek confirmation from USGBC that for the purposes of EA Credit 2.1, we can measure the renewables contribution against the energy load we are modeling as part of our project, not the eventual load of the building once it is occupied, since the scope of the project (and the energy systems we are accountable for) only comprise the core and shell systems. This is consistent with how we are treating the energy systems of the building for Energy Credit 1, as well.
Although a core and shell building may not finish out all portions of a building, the project nonetheless sets up conditions which will define the energy use characteristics of future build-out, through the selection of window and building envelope performance, HVAC configuration limitations, etc. Under the modeling requirements of ASHRAE 90.1, building spaces for which no energy system has been designed should assume full heating and cooling, and no energy performance difference between the baseline and proposed building should be assumed. Under this scenario, the percentage of renewable energy contribution would be based on a reasonable projection of total building energy use, not just on the corridor and lobby loads. The new LEED for Commercial Interiors program (currently in pilot program phase) has excluded renewable energy credits based on the concept that renewable energy systems are part of the building shell. This also suggests that the renewable energy calculation must account for total anticipated building loads, not just corridors and lobbies. Applicable internationally.
Related Addenda (Corrections & Interpretations)