ESS Standard for Quality Reports Structure (ESQRS)
National Statistical Institute
|Contact organisation unit|
'Environmental and Energy Accounts' Department
Daniela Koleva - solid fuels
Antonia Parvanova - oil and petroleum products
Iveta Minkova - natural gas
Irina Dencheva - electricity
|Contact person function|
|Contact mail address|
2, P.Volov Str., Sofia 1038, Bulgaria
|Contact email address|
|Contact phone number|
+359 2 9857 590
+359 2 9857 589
+359 2 9857 191
+359 2 9857 625
|Contact fax number|
Monthly data on production, imports (incl.entries) by country of origin, exports (incl. exits) by country of destination, marine bunkers (for petroleum products only), stock change and deliveries of the following energy products: solid fuels, oil and petroleum products, natural gas and electricity.
· Nomenclature of energy products as part of PRODPROM to 2007
· Nomenclature of energy products (PRODENERGY) since 01.01.2008
Economic activities, covered in data production are: Extraction of coal, oil and natural gas; Production of petroleum products; Production of BKB; Production of electricity; Transport via pipelines; Trade (imports/entries and exports/exits) of energy products.
|Statistical concepts and definitions|
Production, imports (incl. entries) by country of origin, exports (incl. exits) by country of destination, marine bunkers (for petroleum products only), stock change and deliveries of solid fuels, oil and petroleum products, natural gas and electricity.
Statistical unit observed is enterprise.
Enterprises that produce, import and/or export, bunker, store and deliver energy products; operators, performing licensed activities of natural gas transmission and storage.
For the territory of the Republic of Bulgaria.
Since January 2001.
- Monthly report for solid fuels
- Monthly report for oil and petroleum products
- Monthly report for natural gas
- Monthly report for electricity.
|Frequency of data collection|
Data collection is carried out with a questionnaires in Excel format, sent by e-mail.
Questionnaires contain logical and arithmetical controls for preliminary control at the moment of the filling in the data by the respondents. Validation of the obtained data is performed in two stages: at regional level - in RSO and at national level - in NSI, and is expressed in comparison of data with the previous periods and other internal sources of information.
Aggregation of data at national level using Visual Basic.
The data are validated and corrected by the NSI in case of inaccuracies found.
Following the reporting of the data, Eurostat and the International Energy Agency carry out data validation procedure in which, if necessary, additional clarifications related to the reported data are sent, or corrections are made in case of inaccuracies.
Information is used for analytical, forecasting and management purposes by Ministries and other organizations, companies and citizens.
No consumer satisfaction survey was conducted.
Data completely cover the requirements of the Regulation (EC) No 1099/2008 of the European Parliament and of the Council of 22 October 2008 on energy statistics and its amendments in terms of the observed indicators and the range of energy products.
|Data completeness - rate|
Number of data cells provided is equal to the number of required data cells, according to the specifics of each energy product.
|Accuracy and reliability|
|Sampling errors - indicators|
Isolated cases of companies that have ceased or changed their activities, having a negligible impact on aggregated data at the national level.
|Over-coverage - rate|
|Common units - proportion|
Very high share of the common units, as the respondents for indicators Imports (Entries) / Exports (Exits) from the monthly surveys are determined on the basis of administrative data.
Isolated cases of incorrect or missing data.
|Non response error|
No non-response errors.
|Unit non-response - rate|
|Item non-response - rate|
No processing errors.
|Imputation - rate|
|Model assumption error|
|Data revision - policy|
No established official policy for data revision.
|Data revision - practice|
Revision is made in case of change of the used classifications, methodologies, or in case of detection of incorrect data - omissions or inaccuracies in the data submitted by the respondents.
|Data revision - average size|
Not currently calculated.
|Timeliness and punctuality|
Respondents provide data on monthly surveys within 20 days after the reporting month.
The data are reported in the following terms:
- solid fuels - up to 60 days after the reporting month,
- oil and oil products - preliminary data up to 25 days after the reporting month, final data - up to 55 days after the reporting month,
- natural gas - preliminary data up to 30 days after the reporting month, final data - up to 55 days after the reporting month,
- electricity - up to 60 days after the reporting month.
|Time lag - first results|
|Time lag - final results|
Data are published on the 60th day after the reporting month.
Data are published on the dates indicated in the Release Calendar presenting the results of the statistical surveys carried out by the NSI.
|Punctuality - delivery and publication|
Data are submitted in time according to the Release Calendar presenting the results of the statistical surveys carried out by the NSI.
|Coherence and comparability|
Data are comparable with the data of the EU Member States for the whole observed period - from 2001.
|Comparability - geographical|
Data are geographically comparable for the entire period for which they are available - from 2001.
|Asymmetry for mirror flows statistics - coefficient|
|Comparability - over time|
Data are comparable in time for the entire period for which they are available - from 2001.
|Length of comparable time series|
Time series with no breaks for the period from 2001 to the last reporting month.
|Coherence - cross domain|
Data for the indicators Import (Entries), Exports (Exits) and Marine bunkering are consistent with the data of External Trade in Goods Statistics for the respective month, except in cases where methodological differences between the two areas exist.
|Coherence - sub annual and annual statistics|
|Coherence - National Accounts|
|Coherence - internal|
|Accessibility and clarity|
Regular monthly press releases.
Detailed results are available to all users of the NSI website in section 'Environment and Energy', rubric 'Energy' - Production and deliveries of energy products: https://www.nsi.bg/en/node/5019, as wll as in Information system for online requests for statistical information 'INFOSTAT', section 'Environment and Energy', rubric 'Energy' - Production and deliveries of energy products: https://infostat.nsi.bg/infostat/pages/module.jsf?x_2=133
|Data tables - consultations|
Information service upon request according to the Rules for dissemination of statistical products and services.
|Metadata - consultations|
|Documentation on methodology|
Annex B - Monthly energy statistics of the Regulation (EC) No 1099/2008 of the European Parliament and of the Council of 22 October 2008 on energy statistics and its ammendments.
|Metadata completeness – rate|
The metadata elements provided match the total number of metadata elements applied.
Quality report for the data, prepared according to the requirements of the Regulation (EC) No 1099/2008 of the European Parliament and of the Council of 22 October 2008 on energy statistics - prepared on every 5 years.
|Cost and burden|
Costs related to the collection and production of statistical data are announced annually in the National Statistical Program.
No specific studies on the burden of the respondents.
|Confidentiality - policy|
· Law on Statistics;
· Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society:
|Confidentiality – data treatment|
Individual data are not published in accordance with article 25 of the Law on Statistics. Publishing of individual data can be performed only in accordance with article 26 of the same law.
Up to 2019 data on production and imports of crude oil were confidential and were not published. From 2020 only the production is confidential.