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4 Green Star New Zealand – Environmental Key Performance Indicators

In developing this value case for Green Star tenancy fit-outs, the following energy, CO2 and water key performance indicators have been developed for a typical conventional and unrated fit-out compared to 4- star, 5-star and 6-star fit-outs. A further 4-star with energy focus standard has also been developed.

Table 2: Recognised Green Star energy and CO2 emissions – key performance indicators (KPIs)

Environmental key performance indicator (KPI) Unrated fit-out 4-star fit-out 5-star fit-out 6-star fit-out 4-star with energy focus fit-out
Tenancy lighting and small power energy use 95 kWh/m² NLA pa 58 kWh/m² NLA pa 52 kWh/m² NLA pa 43 kWh/m² NLA pa 52 kWh/m²
NLA pa
Associated CO2 emissions* 15.68 kg CO2/m² NLA pa 9.57 kg CO2/m² NLA pa 8.58 kg CO2/m² NLA pa 7.1 kg
CO2/m² NLA pa		 8.58 kg
CO2/m² NLA pa
Tenancy water use excluding base building shower/ changing, and toilets 0.09 m³/m² NLA pa 0.045 m³/m² NLA pa 0.045 m³/m² NLA pa 0.045 m³/m² NLA pa 0.045 m³/m²
NLA pa

* Based on 0.165 kgCO2-e/kWh (Ministry for the Environment, 2007).

Notes:

kWhr (kilowatt hour) = a unit of energy equal to the work done by a power of 1000 watts operating for one hour.

pa (per annum) = in each year.

NLA (net lettable area) = the area for which a tenant could be charged for occupancy under a lease.

Energy, water and CO2 reductions and associated operating cost savings based on these key performance indicators are given in Table 3.

Table 3: Energy, water and CO2 reductions and potential cost savings

Fit-out rating Energy use reduction
kWh/m² NLA pa 		Energy cost saving
$/m 2 NLA pa* 		Water-use reduction
m²/m² NLA pa 		Water cost saving
$/m 2 NLA pa** 		CO 2 reduction
kg CO 2 /m² NLA pa 		CO 2 cost savings
$/m² NLA pa ***
4-star 37 6.66 0.045 0.2 6.1 0.18
5-star 43 7.74 0.045 0.2 7.1 0.21
6-star 52 9.36 0.045 0.2 8.58 0.26
4-star with energy focus 43 7.74 0.045 0.2 7.1 0.21

* Based on assumed energy cost of $0.18/kWh.

** Based on assumed water cost of $4.5/m³.

*** Based on assumed price of carbon of NZ$30/tonne.

Notes:

pa (per annum) = in each year.

NLA (net lettable area) = the area for which a tenant could be charged for occupancy under a lease.

 

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