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Table A2-2:

CH4 emission factors used in the energy sector category

  Emission factor
t CH4/PJ
Source

Natural gas

Electricity – boilers

2.745

IPCC Tier 2 (table 1–15) average for natural gas boilers and large gas-fired turbines >3 MW

Commercial

1.08

IPCC Tier 2 (table 1–19) natural gas boilers

Residential

0.9

IPCC Tier 2 (table 1–18) gas heaters

Domestic transport (CNG)

567

IPCC Tier 2 (table 1–43) passenger cars (uncontrolled)

Other stationary (mainly industrial)

1.26

IPCC Tier 2 (table 1–16) small natural gas boilers

 Liquid fuels

Stationary sources

   

Electricity – residual oil

0.855

IPCC Tier 2 (table 1–15) residual oil boilers – normal firing

Electricity – distillate oil

0.855

IPCC Tier 2 (table 1–15) distillate oil boilers – normal firing

Industrial (including refining) – residual oil

2.85

IPCC Tier 2 (table 1–16) residual oil boilers

Industrial – distillate oil

0.19

IPCC Tier 2 (table 1–16) distillate oil boilers

Industrial – LPG

1.045

IPCC Tier 2 (table 1–18) propane/butane furnaces

Commercial – residual oil

1.33

IPCC Tier 2 (table 1–19) residual oil boilers

Commercial – distillate oil

0.665

IPCC Tier 2 (table 1–19) distillate oil boilers

Commercial – LPG

1.045

IPCC Tier 2 (table 1–18) propane/butane furnaces

Residential – distillate oil

0.665

IPCC Tier 2 (table 1–18) distillate oil furnaces

Residential – LPG

1.045

IPCC Tier 2 (table 1–18) propane/butane furnaces

Agriculture – stationary

3.8

IPCC Tier 2 (table 1–49) diesel engines (agriculture)

Mobile sources

   

LPG

28.5

IPCC Tier 2 (table 1–44) passenger cars (uncontrolled)

Petrol – 1990 onwards

18.525

IPCC Tier 2 (table 1–27) passenger cars (uncontrolled – mid-point of average g/MJ)

Diesel – 1990 onwards

3.8

IPCC Tier 2 (table 1–32) passenger cars (uncontrolled – g/MJ)

Navigation (fuel oil and diesel)

6.65

IPCC Tier 2 (table 1–48) ocean-going ships

Aviation fuel/kerosene

1.9

IPCC Tier 2 (table 1–48) jet and turboprop aircraft

 Coal

Combustion 

   

Electricity generation

0.665

IPCC Tier 2 (table 1–15) pulverised bituminous combustion – dry bottom, wall fired

Cement

0.95

IPCC Tier 2 (table 1–17) cement, lime coal kilns

Lime

0.95

IPCC Tier 2 (table 1–17) cement, lime coal kilns

Industry

0.665

IPCC Tier 2 (table 1–16) dry bottom, wall fired coal boilers

Commercial

9.5

IPCC Tier 2 (table 1–19) coal boilers

Residential

285

IPCC Tier 1 (table 1–7) coal – residential

Biomass 

Wood stoker boilers

14.25

IPCC Tier 2 (table 1–16) wood stoker boilers

Wood – fireplaces

285

IPCC Tier 1 (table 1–7) wood – residential

Biogas

1.08

IPCC Tier 2 (table 1–19) gas boilers