1. 1 Workshop on Energy Balances and Energy related Greenhouse Gas Emission Inventories Copenhagen 24-25 June 2003 CO2 Emission Inventories Harmonisation The Strategy and Work in Denmark By Peter Dal, Danish Energy Authority

2. 2 Possible reasons for divergence Possible reasons for divergence Why revisions of the statistics are needed Why revisions of the statistics are needed Example 1: Firewood in households Example 1: Firewood in households Example 2: Domestic air transport Example 2: Domestic air transport Example 3: CHP by autoproducers Example 3: CHP by autoproducers Effective reporting systems are necessary Effective reporting systems are necessary Contents

3. 3 Possible Reasons for Divergence between Eurostat and EEA on Energy Data Lack of co-ordination between two separate reporting institutions: Not the case in Denmark Revision of historical data are not carried out to the same extent due to differences in the facilities for revision of time series

4. 4 Why Revision of Energy Statistics is Needed  Revised national account statistics (ISIC-Nace)  Changes in calorific values etc.  Improved statistics on renewable energy  Re-evaluation of the transformation sector  Change in definitions of final energy consumption  Re-estimation of components in final energy cons.

5. 5 Example 1: Firewood in Households

6. 6 Example 2: Domestic Air Transport

7. 7 Eurostat / IEA requirements for Statistics in the Transformation Sector Electricity onlyCHPHeat only Public Production AutoproducerThe subject here

8. 8 An Assumption of 200 % Heat Efficiency in Danish CHP-production In 2000, it was decided in the Danish energy statistics to assume a heat-efficiency of 200 % in CHP-production. Previously, fuel use was proportionally split between heat and electricity according to the corresponding heat and electricity production. This shift has had a significant effect on fuel consumption in the transformation sector as well on final energy consumption (especially in manufacturing where CHP-production is very widespread).

9. 9 CHP by Autoproducers: An Example Fuel use: 100 TJ natural gas in a CHP-producing industry company Production: 40 TJ electricity 40 TJ heat, of which 20 TJ is sold for district heating Loss:20 TJ Before - proportionally fuel split: Natural gas used for electricity production: 50 TJ Natural gas used for heat production:50 TJ Used for district heat production25 TJ Used in the company:25 TJ (final consump) Now - 200% heat-efficiency: Natural gas used for electricity production: 80 TJ Natural gas used for heat production:20 TJ Used for district heat production10 TJ Used in the company:10 TJ (final consump)

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11. 11 Conclusions on Autoproducers’ CHP The assumption how to treat fuel consumption in CHP units may differ from country to country Regarding autoproducers: Eurostat and IEA has no knowledge about the split between the transformation sector and final energy consumption The Danish assumption means the more auto- producers’ CHP, the higher the energy efficiency

12. 12 Effective Reporting Systems Are Necessary Before: Completing paper questionnaires IEA’s electronic reporting system But, still all figures to the nearest whole number Time series should be in focus New reporting system for Danish energy statistics