BNZ Carbon Inventory
Emissions Source
A4 and A3 paper purchased
Emissions Factor Source Documentation
EPA Victoria’s Publication 1374 May 2011 - Greenhouse
gas emission factors for office copy paper: International
Calculation Method
As noted in Emissions Factor Source Documentation
Assumptions
 Consumption of paper obtained from corporate
stationary provider is accurate
Building-based refrigerants – in
HVAC and refrigerators
Default refrigerant charge and default leakage rates
taken from Guidance for voluntary, corporate
greenhouse reporting Data and Methods for the 2007
Calendar year – New Zealand Ministry for Environment,
September 2008.
Method reflects GHG Protocol worksheet titled hfc-pfc
(1) - Worksheet 3: Screening Method for HFC and PFC
Emissions from Refrigeration/AC Equipment: Emission
Factor Based Approach: Step 2: Determine Net Gross
HFC and PFC Emissions from Operation of
Refrigeration/AC Equipment
 Where Refrigerant is unknown use R22
 Installation emissions occur at manufacturers site and
are not relevant, unless maintenance personnel have
recorded onsite recharge
 Disposal emissions not relevant to BNZ at leased
facilities. Only relevant for owned property if disposal
of refrigeration equipment occurs as part of
refurbishment
 Default charge and leakage rates used where actual
charge volume could not be collected from labelling on
equipment
 Data provided by corporate travel provider is
complete
Global Warming Potentials have been taken from 2011
Guidelines to DEFRA/DECC’s GHG Conversion Factors
for Company Reporting, July 2011 – Annex 5, Table 5a
and 5b
Business travel - air
2011 Guidelines to DEFRA/DECC’s GHG Conversion
Factors for Company Reporting, July 2011 – Annex 6,
Table 6I
Business travel – employee claims
for use of personal vehicles for
work purposes
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 6e : Average car (unknown fuel)
As noted in Emissions Factor Source Documentation

Activity data captured in passenger km (pkm)
Flight categories applied are as follows:
 Domestic – economy – long distance (>1,200)
 Domestic – economy – short distance (≤1,200). This
includes all domestic flights in UK and NZ.
 Long Haul International (>3700 km) - Business
 Long Haul International (>3700 km) – Economy
 Long Haul International (>3700 km) – Premium
Economy
 Long Haul International (≥3700 km) – First Class
 Short Haul International (≤3700 km) – Business
 Short Haul International (≤3700 km) – Economy. This
includes flights between New Zealand & Australia
 Activity data captured in distance travelled (kms) on
claim forms
 GHG Emissions (t CO2-e) =
Emission Factor Activity Data
1000
 All personal vehicles are average passenger vehicles –
average vehicle with unknown fuel
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BNZ Carbon Inventory
Emissions Source
Business travel – hotel stays
Emissions Factor Source Documentation
Stationary electricity and associated transmission loss
factors taken from:
- 2011 Guidelines to DEFRA/DECC’s GHG Conversion
Factors for Company Reporting, July 2011 – Annex 10,
Table 10a/b: United States, New Zealand, Australia,
Hong Kong, and United Kingdom
- IEA CO2 Emissions from fuelled combustion Highlights
(2010 Edition) – Section 6: Rest of World
Calculation Method
 Activity data captured in nights stays (nights)
 Hotel Emission Factor =
[Emission Factor Average hotel room activity]
 GHG Emissions (t CO2-e) =
Hotel Emission Factor Activity Data (nights)
1000
Assumptions
 No Emissions from food consumption included in
Hotel Emissions
 Data provided by corporate travel provider is
complete
 Activity data captured in distance travelled (km)
 Passenger Transport Conversion tabes used.
 Data provided by service providers is complete




 Data provided by facilities manager and utilities is
complete
Natural gas and associated transmission loss factors
taken from:
- IEA CO2 Emissions from fuelled combustion Highlights
(2010 Edition)Summary Tables - CO2 emissions per kWh
from electricity and heat generation - Average 06-08:
Rest of World, United States, New Zealand, Hong Kong,
and United Kingdom
- National Greenhouse and Energy Reporting
(Measurement) Determination, Compilation 27 June
2009: Australia (Average of all states taken for
transmission loss)
Business travel – rental cars
Stationary energy - diesel, gas and
electricity
Transmission losses – Stationary
energy – gas and electricity
Average hotel room activity data (per night) for
electricity and natural gas taken from Emissions factors
from CIBSE Guide F - Energy Efficiency in building –
Section 20
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 7: Rental car - Small (<1600cc), Rental car Medium (1600-<2500cc) and Rental car - Large
(≥2500cc)
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 1: Distributed Natural Gas – Commercial,
Diesel Combustion – Commercial, Table 4 Purchased
electricity
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 5: Transmission and distribution line
losses for purchased electricity, Table 6: Transmission
and distribution losses for distributed natural gas




Activity data for electricity is in KWh
Activity data for diesel is in Litres
Activity data for gas is in GJ
GHG Emissions (t CO2-e) =
Emission Factor Activity Data
1000
Activity data for electricity is in KWh
Activity data for diesel is in Litres
Activity data for gas is in GJ
GHG Emissions (t CO2-e) =
Emission Factor Activity Data
1000
 Data provided by facilities manager and utilities is
complete
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BNZ Carbon Inventory
Emissions Source
Base building energy - diesel, gas
and electricity
Transmission losses – base
building energy – gas and
electricity
Business travel – taxi use
Business travel – work use vehicle
fleet (diesel and petrol)
Waste to Landfill
Work use vehicle fleet – air
conditioning refrigerant
Emissions Factor Source Documentation
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 1: Distributed Natural Gas – Commercial,
Diesel Combustion – Commercial, Table 4 Purchased
electricity
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 5: Transmission and distribution line
losses for purchased electricity, Table 6: Transmission
and distribution losses for distributed natural gas
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 7: Taxi travel – Dollars spent (GST
inclusive)
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 2: Regular Petrol and Diesel
Guidance for voluntary, corporate greenhouse gas
reporting: Data and methods for the 2009 Calendar
Year, NZ Ministry for Environment, Published May
2011– Table 9: Office Waste – no landfill gas recovery
(New Zealand) and Office Waste – landfill gas recovery
(New Zealand)
Default refrigerant charge and default leakage rates
taken from Guidance for voluntary, corporate
greenhouse reporting Data and Methods for the 2007
Calendar year – New Zealand Ministry for Environment,
September 2008.
Global Warming Potentials have been taken from 2011
Guidelines to DEFRA/DECC’s GHG Conversion Factors
for Company Reporting, July 2011 – Annex 5, Table 5a
and 5b
Calculation Method
 Activity data for electricity is in KWh
 Activity data for diesel is in Litres
 Activity data for gas is in GJ
 GHG Emissions (t CO2-e) =
Emission Factor Activity Data
1000
 Activity data for electricity is in KWh
 Activity data for diesel is in Litres
 Activity data for gas is in GJ
 GHG Emissions (t CO2-e) =
Emission Factor Activity Data
1000
 Activity data captured in $NZ spent on taxi travel
 GHG Emissions (t CO2-e) =
Emission Factor Activity Data
1000
 Activity data captured in litres of fuel
 GHG Emissions (t CO2-e) =
Emission Factor Activity Data
1000
As noted in Source Documentation
GHG Emissions (t CO2-e) =
Emission Factor Activity Data
1000
Method reflects GHG Protocol worksheet titled hfc-pfc
(1) - Worksheet 3: Screening Method for HFC and PFC
Emissions from Refrigeration/AC Equipment: Emission
Factor Based Approach: Step 2: Determine Net Gross
HFC and PFC Emissions from Operation of
Refrigeration/AC Equipment
Assumptions
 Data provided by facilities manager and utilities is
complete
 Data provided by facilities manager and utilities is
complete
 All taxi expense is captured in relevant general ledger
account(s)
 Expenditure is inclusive of GST
 Based on national average flagfall of $2.50 per
kilometre travelled
 All fuel is purchased with fuel card provided
 For sites where waste data is not available,
extrapolation of waste to landfill in tonnes has been
made using waste tonnage per property area (m2) for
the same class/type of property
 Average quantity of refrigerant charge for year
estimated based on inventories recorded at the end of
H1 (Jul-Dec) and H2 (Jan-Jun)
 Where Refrigerant is unknown have assumed
refrigerant is R134A
 Installation emissions occur at manufacturers site and
are not relevant for BNZ vehicle fleet
 Disposal emissions not relevant to BNZ vehicle fleet
which are leased for a three year term of an agreed km
distance and then returned to the fleet manager
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