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

Use of Models and Facility-Level Data in Greenhouse Gas Inventories
2 Comparing UK GHG inventory with ETS combustion
CO 2 data
The previous section has outlined the barriers of using ETS data in the UK GHG inventory. This Chapter shows how the
UK has been able to use selected data in the GHG inventory. It also presents comparisons of the ETS emissions from
selected sectors with GHG inventory data.
2.1 Approach to using ETS data in the UK GHG inventory
When the UK GHG inventory team have assessed whether to use EUETS data in the GHG inventory, we have asked
some simple but important questions:
1) How do emission estimates for the UK, given in the GHG inventory, compare with emissions data given in the
EUETS, and elsewhere?
2) How consistent are the emissions data reported elsewhere, for example how consistent are data in the UK
Pollution Inventory and the CITL?
3) How consistent are the energy statistics reported in the UK Digest of energy Statistics (DUKES), by site
operators under EUETS and in the GHG inventory?
In order to answer the first and third questions, groups of installations are first identified that are comparable in scope to
single emission sources or groups of sources in the GHG inventory. Ideally, one would want to be able to compare at a
fairly disaggregated level but due to the ‘barriers’ described in the sections above, this is not always possible. Once a
group of installations has been identified, then emissions from these installations can be summed to compare with
emission estimates from the GHG inventory.
To answer the second question, data at individual site level can be compared. As well as all of the non-GHG inventory
data sets, this comparison can also include GHG inventory point source data. The UK inventory programme includes
the production of emission maps and other geographically-resolved emissions data for Local Authorities, Devolved
Administrations and to underpin air quality dispersion modelling studies.
In the full analysis, the GHG inventory team used a wide range of data:
• Regulators’ inventories (PI, SPRI, ISR)
• CITL (EUETS)
• Corus (where applicable)
• UKPIA (where applicable)
• EEMS
• GHG inventory i.e. UK level emission estimates
• GHG inventory CO 2 emissions for Type 1 points – site specific data consistent with the UK total
• GHG inventory CO 2 emissions for Type 0 points – site specific data based on detailed analysis of data reported
in the non-GHGI data sets and therefore not consistent with the UK total.
The analysis in this paper concentrates on just the emissions from the UK GHG inventory and the CITL (highlighted in
bold in the list above).
The detailed analysis for greenhouse gases relate to the 2007 reporting year, presented in the 2009 National Inventory
Report.
2.1.1 How has validation and QA/QC been dealt with?
The EUETS data is carefully reviewed by the GHG inventory team before any data from the detailed ETS returns are
included in the GHG inventory. This review includes a comparison with other sources of data from the regulatory
agencies; for example, see the example of the analysis of the data reported by refineries towards the end of
Section 1.3.4. Further comment about the process of the detailed review of the EUETS data is made in the sections
below.
Once the GHG inventory is prepared, it is subject to a formal review by the UK national GHG inventory steering
committee before the UK inventory is formally submitted to the UNFCCC.
IPCC Expert Meeting Report 78 TFI