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tomasotorriani1 Nov 04, 2019 10:58 AM
CO2 emission intensity.
My question is related to the data available on the Eurostat website on CO2 emission intensity (https://www.eea.europa.eu/d[…]3A%5B%22European%20Union%20(current%20composition)%22%5D%7D%7D).
These figures are related to what phase of the electricity generation? Do they include upstream losses and electricity network losses? How do they compare with the data on Table 2, page 9 of the following research? https://www.sciencedirect.com/[…]/S1361920916307933?via%3Dihub
Replies (1)
EEA Nov 04, 2019 01:27 PM
Dear M. Tomaso Torriani,

Thank you for contacting the European Environment Agency (EEA) as regards the annual EEA dataset on CO2 emission intensity (g CO2/kWh).

The EEA dataset does not include upstream emissions; it focuses only on the emissions of CO2 associated with the actual fossil fuel combustion activity for generation purposes. Because of that, the EEA dataset is not comparable with the dataset that you indicated.

The EEA dataset is calculated as follows:

The CO2 intensity of total electricity generation is taken as the ratio of CO2 emissions from all electricity production, both from public main activity producers and autoproducers, against total electricity generation including electricity from nuclear plants and renewable sources. The CO2 emissions used in this indicator (the numerator, expressed in TgCO2) were derived from the reported total CO2 emissions from public electricity and heat generation from the EEA greenhouse gas data viewer (code: 1A1a). As the 1A1a category shows, CO2 emissions for all energy production from Public Electricity Generation, Public Combined Heat and Power, and Public Heat Plants, the following estimations were performed:

- First, the CO2 emissions of gross electricity production were calculated. This was done by multiplying total CO2 emissions (1A1a from the EEA data viewer), with the ratio of electricity production from public conventional thermal power stations (ESTAT: B101121) and all electrical energy production from public conventional thermal power stations (ESTAT: B101121) and district heating (B101109). The ratio for calculating the share of CO2 emissions of electricity production was calculated as electrical energy/(electrical energy + derived heat).
o Transformation output — Main Activity Conventional Thermal Power Stations; Electrical Energy; nrg_105a, 6000_B101121;
o Transformation output — Main Activity Conventional Thermal Power Stations; Derived Heat; nrg_106a, 5200_B101121;
o Transformation output — District Heating Plants; Derived heat; nrg_106a; 5200_B101109.

- Second, the reported CO2 emissions in class 1A1a do not include CO2 emissions from autoproducers. Emissions from autoproducers were therefore estimated by multiplying the electricity output of autoproducers (nrg_105a, 6000_B101122) by a calculated CO2 emission ratio for main activity producers. This CO2 emission ratio was calculated as the CO2 emissions from public electricity production (as derived above), against the amount of electricity produced in public conventional power plants.

A zero CO2 emission factor was applied to nuclear power and to renewables, including to biomass energy. In the case of the former, this is because the method does not take into account life-cycle greenhouse gas emissions. For the latter, this is because — according to the United Framework Convention on Climate Change (UNFCCC) Reporting Guidelines — biomass-related emissions have to be reported as a memorandum item in greenhouse gas inventories, with the assumption being that biomass harvesting would be shown as changes in carbon stocks in the Land Use, Land Use Change and Forestry (LULUCF) sector, and thus not in the energy sector. This should not be interpreted, however, as an endorsement of default biomass sustainability or carbon neutrality.

The denominator of the CO2 intensity of total electricity production is the sum of electricity produced from public conventional thermal power stations (ESTAT: B101121), from autoproducer conventional thermal power stations (ESTAT: B101122), nuclear power stations (ESTAT: B101102) and electricity from renewables (hydro power, wind power, tide, wave and ocean, and solar PV). These data are presented by ESTAT category B101200 (Exchanges and transfers).

We hope that this information may be useful for you.

With kind regards,
EEA Enquiry Service
 
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