Use of data from the EU emission trading scheme for reporting to EU Monitoring Mechanism, UNFCCC and CLRTAP

In order to provide more accurate data for Sweden’s reporting to the EU Monitoring Mechanism, UNFCCC and CLRTAP, the potential of using emission trading data submitted by individual companies in a trading survey in 2004 has been investigated. In 2004 this work involved a quality check by comparing national Swedish data with data on fuel consumption and CO2 emissions reported in the trading survey on plant level for the yeas 1998-2004. In several cases, significant discrepancies were observed which warranted a closer investigation and an eventual revision of activity data and a few emission factors.

This present study covers an investigation of 46 plants with discrepancies in activity data and five plants with discrepancies in emission factors, discovered during the work in 2004. After consultation with the appropriate personnel at each company explanations to the observed differences were found. The results indicated a revision of the activity data, which have been performed for 35 plants. The investigation of emission factors also resulted in revision according to the table below. 

  Previous CO2 factor used  in submission 2005 (ton CO2/TJ) New CO2 factor that will be used in submission 2006 (ton CO2/TJ)
Carbide furnace gas

60

145

Refinery gas

66.7

59.3

Petroleum coke

103

100

 

The revisions of activity data and emission factors resulted in a total of 0.2% higher emissions of greenhouse gas (GHG) emissions in 1990 and 0.3% lower GHG emissions in 2003, as shown in the below diagram. These changes resulted in 2.8% lower emissions of total GHG in Sweden in 2003 than1990. Insubmission 2005, before the revision in this project, Sweden reported a decrease with 2.3% from 1990 to 2003 to the UNFCCC.