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  1. Workshop on Energy Balances and Energy related Greenhouse Gas Emission InventoriesCopenhagen 24-25 June 2003 CO2 Emission Inventories HarmonisationThe Strategy and Work in DenmarkBy Peter Dal, Danish Energy Authority

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

  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. 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. Example 1: Firewood in Households

  6. Example 2: Domestic Air Transport

  7. Eurostat / IEA requirements for Statistics in the Transformation Sector

  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. 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 production 25 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 production 10 TJ Used in the company: 10 TJ(final consump)

  10. 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

  11. 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