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Wellington City FY24 Emissions by Sourcet CO2e% of Pop
% of Pop with $ factor
Local data / consumption
Available?Dataunits
EF (MfE 2024 MEG)
unitst CO2e
2
Fuel sales @ Gas
Y75000091 litres2.37
kg CO2e/l
1777.5
3
37500095 litres2.41
kg CO2e/l
903.75
4
125000
diesel litres
2.68
kg CO2e/l
335
5
3,016
6
OR
7
On Road Transport337,89311,58214,23041.8%
On Road Transport
Census travel mode*
Ysee below6,11342.3%
On Road Transport
8
Electricity (incl. T&D losses)151,0525,1786,36118.7%
Electricity (incl. T&D losses)
Electricity consumption from WE
Y28,928,571kWh0.07823
kg CO2e/kWh
2,26315.7%
Electricity (incl. T&D losses)
40.5 GWh 1 Sep 2023 to 31 Aug 2024 (roughly 40% larger area as parts of khandallah included)
9
Natural Gas (incl. T&D losses)125,4014,2985,28115.5%
Natural Gas (incl. T&D losses)
Gas consumption from Powerco*
partial39,831GJ56.11
kg CO2e/GJ
2,23515.5%
Natural Gas (incl. T&D losses)
10
Air Travel86,3892,9613,63810.7%Air Travel2,91020.1%
Air Travel
Assume 80% of air travel emissions are from leisure (ie: exclude business travel)
11
Refrigerant and AC gases67,6252,3182,8488.4%
Refrigerant and AC gases
5703.9%
Refrigerant and AC gases
Assume 20% of refrigerant emissions are from residential (ie: commercial / industrial facilities)
12
Solid Waste35,6541,2221,5024.4%Solid Waste
Kerbside collection
partial1,337,685kg0.232
kg CO2e/kg
3102.1%
Solid Waste
13
Rail Transport (separated out in 2023)4,8671672050.6%Rail Transport
Rail Transport (from census data)
580.4%
Rail Transport
14
TOTAL:34,065TOTAL14,460TOTAL
15
16
Off-Road Transport and Other Transport37,8431,2971,594
17
Marine Transport105,3933,6134,438N/A
18
Stationary Diesel and Petrol Use18,001617758N/A
19
LPG (Stationary & Transport)14,263489601N/A
20
Enteric Fermentation (livestock)8,907305375N/A
21
Wastewater Treatment8,906305375
N/A? - maybe include it if we get data from Wellington Water?
22
Other Stationary Energy6,058208255N/A
23
Other Industrial Gases4,423152186N/A
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Other Agricultural Emissions2,58489109N/A
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26
27
28
29
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Population - as per STATS NZ 2024
31
Wellington city215,300
32
·  248800 Ngaio North2,580
33
·  249101 Crofton Downs1,720
34
·  249600 Ngaio South3,0807,380
35
% OF POP. FACTOR:
3.4%
36
37
Median Household Income - as per STATS NZ 2023$
# of Households
AVERAGE
38
·  Wellington City134,50077,004
39
·  ·  Ngaio North158,600960
town hall to wellington hospital 9.0km
40
·  ·  Crofton Downs157,900744
town hall to CBD 6.0km
41
·  ·  Ngaio South175,5001,155
town hall to Onslow College 3.8 km
42
2,859$165,245
ngaio station to wgtn station 5.5km
43
$ MULTIPLIER FACTOR:
1.23
44
TRANSPORT CALCULATIONS
45
46
Census Data Ngaio/CD v WellingtonEmissions calc
47
80% of population
48
Percentage of population by main means of travel to work, 2023 Census
Ngaio North
Crofton Downs
Ngaio South
Combined Suburbs
Wellington City
weekly km to work / study (town hall to hospital 3.8 km)
extra km
km/year/person
kmEFt CO2e
49
Work at home19.224.120.320.818.700
50
Drive a private car, truck or van36.637.633.835.731.19090936019,708,7160.2434,789
51
Drive a company car, truck or van4.54.74.64.64.8909093602,535,5870.243616
52
Passenger in a car, truck, van or company bus3.43.63.53.53.1909093601,927,7110.0972187
53
Public bus1.22.115.57.416.690951482,242,3860.05425122
54
Train25.318.710.517.63.4555.531463,266,2530.014848
55
Bicycle4.94.46.55.54.1606062402,008,28200
56
Walk or jog2.62.63.63.015.6606062401,111,61900
57
Ferry0000.0000
58
Other2.62.31.42.02.5115
59
5,878
60
20% of populationweekly
61
Percentage of population by main means of travel to education, 2023 Census
Ngaio North
Crofton Downs
Ngaio South
Combined Suburbs
Wellington City
weekly km to study (town hall to Onslow College 3.8 km)
extra km
km/year/person
kmEFt CO2e
62
Study at home9.29.8109.79.200
63
Drive a car, truck or van5.78.76.86.9738383952400,0530.24397
64
Passenger in a car, truck or van27.933.519.725.822.9383839521,503,9570.0972146
65
Bicycle1.30.61.81.32.33819296458,86500
66
Walk or jog1410.416.814.329.3101572120,98000
67
School bus3.92.97.95.36.79004680368,6160.0542520
68
Public bus3.55.2148.317.5383.82173.6265,5880.0542514
69
Train1427.222.220.53383.82173.6657,6440.014810
70
Ferry0000.0000
71
Other1.31.71.11.32.16
72
293
73
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Reticulated gas consumption calculations
75
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FYE 30 March 2025 Stats - from Michael Grace at Powerco (michael@thegashub.co.nz)
77
Powerco Wellington network consumption1,894,465GJ
78
ICPs (connections)32,610
does include commercial/industrial, doesn't include bottled gas (assume these 2 factors cancel out for our context)
79
Average Standard Residential User38.28GJ80%
of residential users
80
Average Low Residential User11.37GJ20%
of residential users
81
82
Number of households in Ngaio-Crofton Downs2,859
83
Number of households in Wellington City77,004
84
% of household with connection (Wellington avg)42%
85
86
% of city-wide consumption based on households70,338GJ
87
MfE emission factor (incl. T&D losses)56.11kg CO2e/GJ
88
3,947tonnes
89
OR
90
# of ICPsGJMfE factortonnes
91
Ngaio- Crofton Downs Standard User Residential ICPs96937,07856.112,080
92
Ngaio- Crofton Downs Low User Residential ICPs2422,75356.11154
93
39,8312,235
94
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Waste Calculations
96
97
From WCC 2018 Solid Waste Survey
98
Average number of council bags put out for collection per week per household:
1.3
99
Weight per bag:6.68kg
100