Use of Models and Facility-Level Data in Greenhouse Gas Inventories

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Use of Models and Facility-Level Data in Greenhouse Gas Inventories Figure 3-1 Using ETS data in sub national (regional) GHG inventories EU ETS data are used to inform the development of detailed official energy statistics (DUKES) in that they provide a minimum value (de-minimus) for the fuel used in certain sectors of industry, and the statisticians check that this is consistent with their independently derived energy consumption data. The next sections provide two examples to show how detailed EUETS data could be used to help improve the accuracy of sub national inventories in the UK. There is a discussion about the reasons for differences between the different data sources in each section. 3.2 Coal fired power stations Emissions of CO 2 from coal fired power stations make a large contribution to the total emissions in the constituent countries of the UK. CITL data could be used to improve the accuracy of these estimates. Table 3-1 provides an example of site-specific data that could be used for a selection of power stations. The table shows data where emissions data are most variable across different reporting mechanisms which then allows a discussion about the reasons for this variability. IPCC Expert Meeting Report 86 TFI
Use of Models and Facility-Level Data in Greenhouse Gas Inventories Table 3-1 Emissions data for selected coal-fired power stations (ktonnes CO 2) Data for selected coal fired power stations Site IPPC regulatory inventories CITL Ferrybridge C 8,822 8,287 Fiddlers Ferry 5,859 5,636 Tilbury B 4,008 4,723 Aberthaw B 4,077 4,187 Drax 22,649 22,161 Kingsnorth 9,090 8,914 Fifoots Point 631 649 West Burton 9,434 9,324 All of the data sets include emissions from Flue Gas Desulphurisation (FGD) systems as well as the combustion of fuels. In the case of Ferrybridge C, Fiddlers Ferry, Drax, Kingsnorth, and West Burton, the data from the IPPC regulatory inventories and the CITL follow a similar pattern to that noted in the data for the group as a whole, with higher emissions reported under IPPC. The differences are in part due to biocarbon from co-fired biomass being included in the IPPC data. In theory it is possible to identify emissions from the FGD plants in the detailed ETS returns, but this may reveal data that commercially confidential. In the case of Tilbury B, Aberthaw B, and Fifoots Point, the CITL figure is higher than that given by the regulator’s inventory and although the difference is relatively small in the latter two cases, it is a very significant difference in the case of Tilbury B. Emissions data are supplied to regulators at different times for different purposes and different individuals might be involved in preparing and submitting these data sets. Therefore, small differences in numbers might occur due to different data being available (i.e. ‘provisional’ and ‘final’ data) or differences in methodology. It seems reasonable to believe that the differences for Aberthaw B and Fifoots Point could be due to a factor such as this (the difference is ~3% in each case). The difference for Tilbury B is 18%, so either any revisions to data or methodology would have to be very significant, there would have to be a major difference in scope, or one or other figure contained an error. Without further information, it is not possible to conclude what reason there is for the difference, although a difference in scope appears the least likely. 3.3 Refineries Table 3-2 shows CO 2 emissions data for individual refineries. IPCC Expert Meeting Report 87 TFI
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Use of Models and Facility-Level Data in Greenhouse Gas Inventories

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