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Methodological explanation for the news release:

Balance of Electrical energy

Sources of data collection

Sources of data collection for the annual report on electricity are: Monthly surveys on energy, Ene.1, Ene.2, Ene.3, Ene.13, Ene.15; Annual surveys on energy, Ene.51, Ene.52, Ene.53 Ene.54, Ene.55, Ene.63, Ene.65, Annual survey on forestry, Annual survey on agriculture.

Data scope

In the process of collecting data from the reporting units the method of full coverage is used (for business entities that perform production, transmission and distribution of electricity), as well as the sample method (for business entities that are consumers of energy).


For defining the categories in the balance scheme the Annual questionnaire for Electricity, 2009 of Eurostat, ECE/UN and IEA/OECD is used.

Import/Export represents the quantity that entered/left the national territory i.e. the diference between entrance and exit from the national territory or the difference between exit and entrance into the national territory.

Transformation output includes gross production of thermal electricity produced by transformation from primary sources.

Public thermal power stations are plants for production of Electricity only.

Autoproducer thermal power stations are plants for combined production of electricity and Heat.

CHP plants are combined heat and power plants, which produce both heat and electricity intended for sale. Exchanges and transfers, returns represent transfer of hydroelectricity gross production.

Distribution losses include all losses due to transmission and distribution of electricity.

Available for final consumption is the electricity available to final consumers.

Statistical difference is the difference between Available for final consumption and Final energy consumption.

Gross national electricity consumption = Total gross production + Imports - Exports

Calculation method

For calculating the Balance of electricity (total, by months) the methodology ‘’Energy Statistics Methodology Eurostat F4, 1998’’ is used.


In the distribution of the final electricity consumption the National Classification of Activity (Official Gazette No.09/2006) is used.

Last updated: 08.02.2011


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