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Denmark's National Inventory Report 2005 - Submitted under the ...

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Table 3A-21 Key sources, stationary combustion<br />

<br />

<br />

Ã<br />

<br />

CO2 Emission from stationary Combustion Coal CO2 Yes Level, Trend<br />

CO2 Emission from stationary Combustion Petroleum coke CO2 Yes Level, Trend<br />

CO2 Emission from stationary Combustion Plastic waste CO2 Yes Level, Trend<br />

CO2 Emission from stationary Combustion Residual oil CO2 Yes Level, Trend<br />

CO2 Emission from stationary Combustion Gas oil CO2 Yes Level, Trend<br />

CO2 Emission from stationary Combustion Kerosene CO2 Yes Trend<br />

CO2 Emission from stationary Combustion Natural gas CO2 Yes Level, Trend<br />

CO2 Emission from stationary Combustion Refinery gas CO2 Yes Level<br />

Non-CO2 Emission from stationary Combustion CH4 Yes Trend<br />

7 Uncertainty<br />

According to <strong>the</strong> IPCC Good Practice Guidance (IPCC 2000) uncertainty estimates<br />

should be included in <strong>the</strong> annual <strong>National</strong> <strong>Inventory</strong> <strong>Report</strong>.<br />

Uncertainty estimates include uncertainty with regard to <strong>the</strong> total emission inventory<br />

as well as uncertainty with regard to trends. The GHG emission from stationary combustion<br />

plants has been estimated with an uncertainty interval of ±11% and <strong>the</strong> increase<br />

in <strong>the</strong> GHG emission since 1990 has been estimated to be 11,1% ± 1,7 %-agepoints.<br />

7.1 Methodology<br />

The Danish uncertainty estimates for GHGs are based on a methodology included in<br />

IPCC Good Practice Guidance (IPCC 2000). The estimates are based on uncertainties<br />

for emission factors and fuel consumption rates, respectively. The input data required<br />

for <strong>the</strong> uncertainty calculations are:<br />

• Emission data for <strong>the</strong> base year and <strong>the</strong> last year<br />

• Uncertainty for activity rates<br />

• Uncertainty for emission factors<br />

7.1.1 Greenhouse gases<br />

The Danish uncertainty estimates for GHGs are based on <strong>the</strong> tier 1 approach in IPCC<br />

Good Practice Guidance (IPCC 2000). The uncertainty levels have been estimated for<br />

<strong>the</strong> following emission source subcategories within stationary combustion:<br />

• CO 2 emission from each of <strong>the</strong> applied fuel categories<br />

• CH 4 emission from gas engines<br />

• CH 4 emission from all o<strong>the</strong>r stationary combustion plants<br />

• N 2 O emission from all stationary combustion plants<br />

The separate uncertainty estimation for gas engine CH 4 emission and CH 4 emission<br />

from o<strong>the</strong>r plants does not follow <strong>the</strong> recommendations in <strong>the</strong> IPCC Good Practice<br />

Guidance. Disaggregation is applied, because in Denmark <strong>the</strong> CH 4 emission from gas<br />

engines is much larger than <strong>the</strong> emission from o<strong>the</strong>r stationary combustion plants,<br />

and <strong>the</strong> CH 4 emission factor for gas engines is estimated with a much smaller uncertainty<br />

level than for o<strong>the</strong>r stationary combustion plants.<br />

269

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