Reference metadata describe statistical concepts and methodologies used for the collection and generation of data. They provide information on data quality and, since they are strongly content-oriented, assist users in interpreting the data. Reference metadata, unlike structural metadata, can be decoupled from the data.
Department for Organization and Supervision of Natural Gas Market
1.3. Contact name
Confidential because of GDPR
1.4. Contact person function
Confidential because of GDPR
1.5. Contact mail address
Mesogeion Av. 119, 101 92, Athens, Greece
1.6. Contact email address
Confidential because of GDPR
1.7. Contact phone number
Confidential because of GDPR
1.8. Contact fax number
Confidential because of GDPR
2.1. Metadata last certified
30 June 2025
2.2. Metadata last posted
30 June 2025
2.3. Metadata last update
30 June 2025
3.1. Data description
Biannual and annual statistics on natural gas prices for household and non-household consumers expressed in euro per Giga Joule (€/GJ).
3.2. Classification system
The classification system is in accordance with the Regulation (EU) No 1952/2016. Data are categorized by consumer type (household/non-household), time period (annual or biannual) and consumption.
3.3. Coverage - sector
Household sector and non-household sector (industry, services, offices, agriculture, etc).
3.4. Statistical concepts and definitions
The prices are collected in national currencies per GJ and according to different bands of consumption.
For the households sector, these bands are:
D1: Customers consuming less than 20 GJ.
D2: Customers consuming 20 GJ or more but less than 200 GJ.
D3: Customers consuming 200 GJ or more.
For the final non-households sector, the bands are:
I1: Customers consuming less than 1000 GJ.
I2: Customers consuming 1000 GJ or more but less than 10000 GJ.
I3: Customers consuming 10000 GJ or more but less than 100000 GJ.
I4: Customers consuming 100000 GJ or more but less than 1000000 GJ.
I5: Customers consuming 1000000 GJ or more but less than 4000000 GJ.
I6: Customers consuming 4000000 GJ or more.
There exist 2 different levels of disagregation for semestrial and annual prices:
1- Semestrial prices:
These prices are reported twice a year and are divided in 3 levels:
Level 1 prices: Prices excluding taxes and levies.
Level 2 prices: Prices excluding VAT and other recoverable taxes and levies.
Level 3 prices: Prices including all taxes and levies.
2- Annual prices:
These prices are reported once a year together with the data for the second semester and are divided into the following components and taxes:
Energy and supply: commodity price for natural gas paid by the supplier or the price of natural gas at the point of entry into the transmission system, including, if applicable, the following end-user costs: storage costs plus costs relating to the sale of natural gas to final customers.
Network cost: transmission and distribution tariffs, transmission and distribution losses, network costs, after-sale service costs, system service costs and meter rental and metering costs.
Value added taxes (VAT): as defined in Council Directive 2006/112/EC.
Renewable taxes: taxes, fees, levies or charges relating to the promotion of renewable energy sources, energy efficiency and CHP generation.
Capacity taxes: taxes, fees, levies or charges relating to strategic stockpiles, capacity payments and energy security; taxes on natural gas distribution; stranded costs and levies on financing energy regulatory authorities or market and system operators.
Environmental taxes: taxes, fees, levies or charges relating to air quality and for other environmental purposes; taxes on emissions of CO2 or other greenhouse gases.
All other taxes: taxes, fees, levies or charges not covered by any of the previous four categories: support for district heating; local or regional fiscal charges; island compensation; concession fees relating to licences and fees for the occupation of land and public or private property by networks or other devices. This component includes the excise duties.
In addition to these elements, the network cost is split into the respective shares of transmission and distribution.
3.5. Statistical unit
Household and final non-household consumers divided into consumption bands.
3.6. Statistical population
All natural gas suppliers operating in the Greek retail gas market during the reference period.
3.7. Reference area
The reference area is the whole country.
3.8. Coverage - Time
Natural gas prices data for Greece are available since 2012.
3.9. Base period
Not applicable.
The data are expressed in two units: i. prices are reported in euros per GJ (€/GJ) & ii. network cost and consumption volumes in percentage (%).
For semestrial prices, the reference periods are from January to June for semester 1 and from July to December for semester 2.
For annual prices, the reference period is the whole calendar year (from January to December).
6.1. Institutional Mandate - legal acts and other agreements
At EU level:
Regulation (EU) 2016/1952 of the European Parliament and of the Council of 26 October 2016 on European statistics on natural gas and electricity prices and repealing Directive 2008/92/EC (Text with EEA relevance).
Commission Implementing Regulation (EU) 2017/2169 of 21 November 2017 concerning the format and arrangements for the transmission of European Statistics on natural gas and electricity prices pursuant to Regulation (EU) 2016/1952 of the European Parliament and of the Council (Text with EEA relevance).
Commission Implementing Regulation (EU) 2019/803 concerning the content of quality reports on European statistics on natural gas and electricity prices pursuant to Regulation (EU) 2016/1952 of the European Parliament and of the Council (Text with EEA relevance).
All data sharing procedures comply with the principles of data confidentiality, quality assurance, and timeliness, as outlined in the European Statistics Code of Practice.
The processed data are shared with Eurostat and the International Energy Agency (IEA).
7.1. Confidentiality - policy
The legal framework, at national and European level, ensures the privacy of data providers, the confidentiality of the information they submit, its exclusive use for statistical purposes, and the security of the data.
At the European level, confidentiality requirements stem from:
Regulation (EC) No 223/2009 of the European Parliament and of the Council, of 11 March 2009, on the transmission of data subject to statistical confidentiality to the Statistical Office of the European Communities.
Regulation (EC) No 557/2013 of 17 June 2013 implementing Regulation (EC) No 223/2009 of the European Parliament and of the Council on European Statistics as regards access to confidential data for scientific purposes and repealing Commission Regulation (EC) No 831/2002 (Text with EEA relevance)
At national level confidentiality requirements stem from:
Articles 7, 8 and 9 of the Law 3832/2010 as in force
Law 4233/2014 as in force, Article 27 (paragraph 2)
7.2. Confidentiality - data treatment
To ensure statistical confidentiality a set of established rules and procedures is applied to natural gas price data.
Data are considered confidential if there are less than 3 reporting companies. In this case the value is flagged with the appropriate symbol.
Published data must not allow the identification of individual consumers.
Micro-data are available upon request, subject to compliance with the confidentiality rules and data anonymization procedures.
8.1. Release calendar
At the national level, a release calendar has not yet been established on the Ministry’s website.
8.2. Release calendar access
Not applicable.
8.3. Release policy - user access
Natural gas price data are released simultaneously to all users through the official Ministry's website, ensuring equal access and non-discriminatory treatment.
The statistics on natural gas prices in Greece are disseminated on the Ministry’s website on a biannual basis, in accordance with the Regulation (EU) 2016/1952, following their publication by Eurostat. The published data refer to the total price of the most prevalent consumption band for household and non-household consumers.
10.1. Dissemination format - News release
Not available at national level.
10.2. Dissemination format - Publications
The data published on the Ministry's website refer only to the total price of the most prevalent consumption band.
A quality assurance framework is in place, aligned with the European Statistics Code of Practice.
The following quality assurance procedures are applied:
Staff participation in Eurostat training regarding natural gas prices,
Data validation checks and communication with data providers to ensure the accuracy, consistency, and reliability of the data,
Communication and provision of guidelines to data providers to ensure proper application of the rules for natural gas price data.
11.2. Quality management - assessment
An annual report on the outcome of the statistical work programme of the previous year is submitted to the NSI.
12.1. Relevance - User Needs
The data produced can be an important source of information for domestic and international users (government agencies, research institutions, international organizations, etc.) whose needs are met without breaching the principle of confidentiality.
12.2. Relevance - User Satisfaction
Not available.
12.3. Completeness
The Regulation (EU) 2016/1952 is fully implemented. All mandatory fields and their components are duly completed.
12.3.1. Data completeness - rate
Data sets are complete by 100%.
13.1. Accuracy - overall
Natural gas price data in Greece is collected through census of the relevant reporting units, namely all companies operating within Greece. As a result, the statistical outputs are not subject to sampling error. However, other sources of errors may affect the accuracy of the final data.
Main sources of potential errors include:Random errors,measurement errors and non-response or late reporting.
Regarding random errors: These may arise from occasional misreporting by data providers or data entry mistakes.
13.2. Sampling error
The statistical output is based on a census covering all relevant reporting units, therefore no coverage error occurs.
13.2.1. Sampling error - indicators
The statistical output is based on a census covering all relevant reporting units, therefore no coverage error occurs.
13.3. Non-sampling error
The main types of non sampling error can be classified into processing, measurement and non-response errors.
13.3.1. Coverage error
The statistical output is based on a census covering all relevant reporting units, therefore no coverage error occurs.
13.3.1.1. Over-coverage - rate
The statistical output is based on a census covering all relevant reporting units, therefore no over-coverage error occurs.
13.3.1.2. Common units - proportion
Not applicable.
13.3.2. Measurement error
Measurement errors primarily arise when data providers misinterpret what each field in the questionnaire entails, leading to inaccurate reporting, or when the required data are difficult to retrieve. In cases where errors are identified, they are addressed by asking data providers to review their submissions.
13.3.3. Non response error
The non-response rate depends solely to the unit non-response rate.
13.3.3.1. Unit non-response - rate
In the first semester of 2022 20 out of 21 natural gas suppliers submitted data. The share of natural gas consumption represented by the non-responding supplier was 4,3%. In the second semester of 2022 all natural gas suppliers submitted data (21 out of 21).
In 2023 all natural gas suppliers submitted data (20 out of 20).
In 2024 all natural gas suppliers submitted data (19 out of 19).
13.3.3.2. Item non-response - rate
Item non-response rate is 0%.
13.3.4. Processing error
As the system is not fully automated, processing errors may occur. During data collection, errors are monitored and minimized. Although data entry mistakes may occur, these issues are addressed through the implementation of quality control procedures, including validation checks.
13.3.5. Model assumption error
Not applicable.
14.1. Timeliness
Data providers are requested to provide the natural gas price data within 2 months after the reference period. The competent authority checks the micro-data for correctness, consistency and completeness and national averages are calculated and reported to Eurostat during the third month after the reference period.
14.1.1. Time lag - first result
The time lag from the last day of the reference period to the day of publication of first results is approximately 3.5 to 4 months.
14.1.2. Time lag - final result
Data for the first semester are frequently revised upon submission of the second semester data and the annual data. Therefore the time lag for the publication of the final results for the first semester of each reporting year is approximately 12 months after the last day of the respective reference period. For the second semester and the annual data the time lag for the publication of the final results is approximately 3 months after the last day of the respective reference period.
14.2. Punctuality
The legal deadline for submitting the questionnaires is the third month after the reference period. We submit the data before the deadline expires.
14.2.1. Punctuality - delivery and publication
See above answer in 14.2.
15.1. Comparability - geographical
Collected data concern the whole territory. There is no comparison between different geographical areas.
15.1.1. Asymmetry for mirror flow statistics - coefficient
Not applicable.
15.2. Comparability - over time
Natural gas price statistics are comparable over time.
15.2.1. Length of comparable time series
There is no break in time series.
15.3. Coherence - cross domain
Not applicable.
15.3.1. Coherence - sub annual and annual statistics
Not applicable.
15.3.2. Coherence - National Accounts
Not applicable.
15.4. Coherence - internal
Natural gas price statistics are carefully designed to ensure internal consistency.
The cost associated with the collection, production, and dissemination of natural gas price statistics is difficult to be estimated .
17.1. Data revision - policy
Whenever data is submitted as provisional, a revision follows as soon as the final data is available. In case one or more data providers submit a revision or or when errors are identified, prices are recalculated and submitted as soon as possible. When necessary, the semester 1 data is revised when submitting the semester 2 data for consistency reason between semestrial and annual prices.
17.2. Data revision - practice
Revisions typically result from corrections submitted by reporting companies or from inconsistencies or errors identified during post-validation checks from Eurostat. Typically, data for the first sememster are revised upon submission of the annual data, as respondents have more accurate information at that time.
17.2.1. Data revision - average size
Not applicable.
18.1. Source data
The data are collected from all companies that supply natural gas to final consumers, including both households and non-household sectors.
18.2. Frequency of data collection
For gas prices: half yearly
For gas price components: yearly
18.3. Data collection
Data are collected directly from natural gas suppliers through standardized reporting questionnaires. Validation checks are applied to ensure data quality and consistency. Consumption-weighted average prices are calculated from raw data.
18.4. Data validation
The data collected undergo validation processes to ensure their accuracy and completeness. Validation checks include verification of data consistency and completeness. If inconsistencies are identified, data providers are contacted for further explanation or correction. Response rate is monitored to ensure the data reflect the full scope of the natural gas market. Non-response cases are addressed through direct communication with respondents. Further validation steps are taken to confirm the quality of the final outputs. This includes checks for internal consistency within the dataset, such as verifying that totals match component sums.
18.5. Data compilation
Not applicable.
18.5.1. Imputation - rate
Imputation rate is zero.
18.6. Adjustment
Not applicable.
18.6.1. Seasonal adjustment
Not applicable.
Biannual and annual statistics on natural gas prices for household and non-household consumers expressed in euro per Giga Joule (€/GJ).
30 June 2025
The prices are collected in national currencies per GJ and according to different bands of consumption.
For the households sector, these bands are:
D1: Customers consuming less than 20 GJ.
D2: Customers consuming 20 GJ or more but less than 200 GJ.
D3: Customers consuming 200 GJ or more.
For the final non-households sector, the bands are:
I1: Customers consuming less than 1000 GJ.
I2: Customers consuming 1000 GJ or more but less than 10000 GJ.
I3: Customers consuming 10000 GJ or more but less than 100000 GJ.
I4: Customers consuming 100000 GJ or more but less than 1000000 GJ.
I5: Customers consuming 1000000 GJ or more but less than 4000000 GJ.
I6: Customers consuming 4000000 GJ or more.
There exist 2 different levels of disagregation for semestrial and annual prices:
1- Semestrial prices:
These prices are reported twice a year and are divided in 3 levels:
Level 1 prices: Prices excluding taxes and levies.
Level 2 prices: Prices excluding VAT and other recoverable taxes and levies.
Level 3 prices: Prices including all taxes and levies.
2- Annual prices:
These prices are reported once a year together with the data for the second semester and are divided into the following components and taxes:
Energy and supply: commodity price for natural gas paid by the supplier or the price of natural gas at the point of entry into the transmission system, including, if applicable, the following end-user costs: storage costs plus costs relating to the sale of natural gas to final customers.
Network cost: transmission and distribution tariffs, transmission and distribution losses, network costs, after-sale service costs, system service costs and meter rental and metering costs.
Value added taxes (VAT): as defined in Council Directive 2006/112/EC.
Renewable taxes: taxes, fees, levies or charges relating to the promotion of renewable energy sources, energy efficiency and CHP generation.
Capacity taxes: taxes, fees, levies or charges relating to strategic stockpiles, capacity payments and energy security; taxes on natural gas distribution; stranded costs and levies on financing energy regulatory authorities or market and system operators.
Environmental taxes: taxes, fees, levies or charges relating to air quality and for other environmental purposes; taxes on emissions of CO2 or other greenhouse gases.
All other taxes: taxes, fees, levies or charges not covered by any of the previous four categories: support for district heating; local or regional fiscal charges; island compensation; concession fees relating to licences and fees for the occupation of land and public or private property by networks or other devices. This component includes the excise duties.
In addition to these elements, the network cost is split into the respective shares of transmission and distribution.
Household and final non-household consumers divided into consumption bands.
All natural gas suppliers operating in the Greek retail gas market during the reference period.
The reference area is the whole country.
For semestrial prices, the reference periods are from January to June for semester 1 and from July to December for semester 2.
For annual prices, the reference period is the whole calendar year (from January to December).
Natural gas price data in Greece is collected through census of the relevant reporting units, namely all companies operating within Greece. As a result, the statistical outputs are not subject to sampling error. However, other sources of errors may affect the accuracy of the final data.
Main sources of potential errors include:Random errors,measurement errors and non-response or late reporting.
Regarding random errors: These may arise from occasional misreporting by data providers or data entry mistakes.
The data are expressed in two units: i. prices are reported in euros per GJ (€/GJ) & ii. network cost and consumption volumes in percentage (%).
Not applicable.
The data are collected from all companies that supply natural gas to final consumers, including both households and non-household sectors.
The statistics on natural gas prices in Greece are disseminated on the Ministry’s website on a biannual basis, in accordance with the Regulation (EU) 2016/1952, following their publication by Eurostat. The published data refer to the total price of the most prevalent consumption band for household and non-household consumers.
Data providers are requested to provide the natural gas price data within 2 months after the reference period. The competent authority checks the micro-data for correctness, consistency and completeness and national averages are calculated and reported to Eurostat during the third month after the reference period.
Collected data concern the whole territory. There is no comparison between different geographical areas.
Natural gas price statistics are comparable over time.
