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NABERS Energy Guide to Building Energy Estimation
If no specific allocation of the energy use is identified in lease documentation, the relevant
proportion shall be determined by the total number of tenant allocated spaces divided by the total
number of available car parks. Where pass cards or keys are provided, the number of tenant
allocated spaces is to be deemed to be the greater of the number of physically dedicated spaces
and the number of pass cards or keys issued (to a limit of the total number of available car parks).
Tenant car park, pass or key allocation information should be sourced from the lease
If there is no documentation describing carpark use by tenants then all of the energy use must be
The percentage of energy allocation must be documented as per the above; therefore the actual
percentage rate can be used in the allocation, up to a maximum of 100% of the relevant utility bill.
Treatment of on-site generation. On-site generation that is connected to the building-side of the
electricity meter can be counted against on-site energy use. No discount of on-site energy use is
available against energy exported from the site under any circumstances. Fuels used to generate onsite energy must be included within the energy assessment.
Treatment of GreenPower. Any planned or future purchase of GreenPower, the accredited zero
greenhouse emission renewable energy supply product provided by energy retailers, is to be treated as
normal (i.e. non-GreenPower) electricity for the purposes of the assessment of a new building’s
performance under this document. High greenhouse performance in the new building or tenancy is to
be achieved through good design focussed on energy efficiency, and / or the application of renewable
energy integrated into the building and used by the building to reduce its reliance on fossil fuel energy
5 Default Figures
Where no information is available, the following default occupancy information is to be used:
 Occupant Density*: 1 per 15 m²
Equipment loads*: 11 W/m², built up by the random distribution into zones of the following loads
5W/m²|7W/m²|11W/m²|15W/m²|19W/m² in the following proportions: 1:2:2:1:1
Simulators must check that the area-weighted average equipment load in their model is within
10% of 11W/m².
Lighting load in tenancies (for “shell and core” buildings)*: 12 W/m²
Lifts 8 kWh/m² based on NLA.
Domestic hot water demand*: 2 kWh/m² based on NLA, plus any system losses
Hourly profiles*: As per the default schedules below.
Base building energy for tenant condenser water loops (tenant unknown)*. The energy use shall
be derived on the basis of cooling loads at 50% of the supplementary condenser water system
capacity operating for 10 hours a day and at 20% of the supplementary condenser water loop
capacity for the balance of time. A COP of 2.4 shall be used for the tenant units.
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Version 2011-June