Energy statistics - quantities (nrg

Energy statistics - quantities (nrg_quant)

National Reference Metadata in Single Integrated Metadata Structure (SIMS)

Compiling agency: Ministry of Environment and Energy

For any question on data and metadata, please contact: Eurostat user support

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1. Contact

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1.1. Contact organisation

Ministry of Environment and Energy

1.2. Contact organisation unit

General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency

1.5. Contact mail address

Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency, Mesogion 119 Str, 10192 Athens, Greece.

2. Metadata update

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2.1. Metadata last certified

07/10/2022

2.2. Metadata last posted

07/10/2022

2.3. Metadata last update

07/10/2022

3. Statistical presentation

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3.1. Data description

See table below.

3.1.1. Data description – details and links to EU data collections

Name of the national data collection	National body responsible	List of variables included in this data collection	Link to EU data collections (by frequency, energy product set, sector)
Monthly electricity	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency	Generation Consumption in public power thermal stations Trade (imports / exports) Fuel stocks in public power thermal stations	Monthly electricity statistics Hydro power, wind power, conventional thermal, solar power Generation Consumption in public power thermal stations Trade (imports / exports) Fuel stocks in public power thermal stations
Monthly solid	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency	Public and Private companies Physical imports Physical exports Hard coal Lignite Stocks	Monthly solid statistics Deliveries Production Trade (imports / exports) Stocks
Monthly natural gas	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Hydrocarbons	Natural gas supplied to the consumer (Nm³, TJ) per system operator Network losses (Nm³, TJ) per system operator Total injection into the marked area (Nm³, TJ) per system operator Interconnected grid: entry and exit points, Max flow (Mcm/h) (data from system operator) Physical imports (Nm³, TJ) per interconnector (total & LNG) Physical exports (Nm³, TJ) per interconnector Production (total & LNG) Physical production (Nm³, TJ) per production facility	Monthly natural gas statistics For the sectors below with some of the following energy products: natural gas Deliveries Production Trade (imports / exports) Stocks
Monthly oil	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Hydrocarbons	1. Refinery gas 2. LPG 3. Naphtha 4. Aviation gas 5. Gasoline as feedstock 6. Gasoline type jet fuel 7. Kerosene as feedstock 8. Kerosene type jet fuel 9. other kerosene 10. other kerosene 11. Gasoil as feedstock 12. other gasoil 13. Residual fuel oil as feedstock 14. Lubricants 15. Paraffin 16. Bitumen 17. Crude oil 18. other products 19. losses	Monthly oil statistics For the sectors below with some of the following energy products: Crude oil; Refinery feedstocks; Additives-oxygenates; Refinery gas; LPG; Naphtha; Motor gasoline; Aviation gasoline; Kerosene type jet fuel; Other kerosene; Gas/diesel oil; Fuel oil; Petroleum coke; Other oil products; Refinery output or production in case of crude oil Direct use Refineries (backflows and products transferred) Trade (imports / exports) Stocks
Annual electricity	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency	Production Transformation sector Consumption: Energy sector Consumption: Industry Consumption: Transport Consumption: Residential Trade (imports / exports) Infrastructure Calorific values	Annual electricity statistics Production Transformation sector Consumption: Energy sector Consumption: Industry Consumption: Transport Consumption: Residential Trade (imports / exports) Infrastructure Calorific values
Annual solid	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency	Primary production and calorific value of fuel source - Hard coal - Lignite Physical imports and exports per neighbouring country Stock of fuel at the beginning and end of period per producer/ respondent Consumption / own use per respondent	Annual solid fuels statistics For the sectors below with some of the following energy products: Sub-bituminous coal; Lignite; Transformation sector Production Consumption: Energy sector Consumption: Industry Consumption: Transport Consumption: Residential Consumption: Other Trade (imports / exports) Stocks Infrastructure Calorific values
Annual natural gas	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Hydrocarbons and Directorate for Energy Policy and Energy Efficiency	- Natural gas supplied to the consumer (Nm³, TJ) per system operator - Network losses (Nm³, TJ) per system operator - Total injection into the marked area (Nm³, TJ) per system operator Interconnected grid (data from system operator) - Physical imports (Nm3, TJ) per interconnector (total & LNG) - Physical exports (Nm3, TJ) per interconnector (total & LNG) Production - Physical production (Nm3, TJ) per production facility	Annual natural gas statistics For the sectors below and the following energy products: natural gas Transformation sector Production Consumption: Energy sector Consumption: Industry Consumption: Transport Consumption: Other (Commercial and public services, Residential, Agriculture/forestry, Fishing, Not elsewhere specified) Trade (imports / exports) Stocks Infrastructure Calorific values
Annual oil	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Hydrocarbons and Directorate for Energy Policy and Energy Efficiency	1. Refinery gas 2. LPG 3. Naphtha 4. Aviation gas 5. Gasoline as feedstock 6. Gasoline type jet fuel 7. Kerosene as feedstock 8. Kerosene type jet fuel 9. other kerosene 10. other kerosene 11. Gasoil as feedstock 12. other gasoil 13. Residual fuel oil as feedstock 14. Lubricants 15. Paraffin 16. Bitumen 17. Crude oil 18. other products 19. losses	Annual oil and petroleum products statistics For the sectors below with some of the following energy products: Crude oil; Refinery feedstocks; Additives-oxygenates; Refinery gas; LPG; Naphtha; Motor gasoline; Aviation gasoline; Kerosene type jet fuel; Other kerosene; Gas/diesel oil; Fuel oil; Lubricants; Bitumen; Paraffin waxes; Petroleum coke; Other oil products; Transformation sector / Refinery Production Consumption: Energy sector Consumption: Industry Consumption: Transport Consumption: Residential Consumption: Other Trade (imports / exports) Stocks Infrastructure Calorific values
Annual renewables	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency	Gross electricity production and own use (including pumping) of power plants >= 1 MW, calorific value of primary energy source, Physical imports and exports per neighbouring country.	Annual renewables and wastes statistics For the sectors below with some of the following energy products: Hydro power; Wind power; Geothermal; Solar thermal; Solar photovoltaic; Solid biofuels; Liquid biofuels; Biogases; Municipal waste; Industrial waste; Production Transformation sector Consumption: Energy sector Consumption: Industry Consumption: Transport Consumption: Residential Consumption: Other Trade (imports / exports) Stocks Infrastructure Calorific values
Share of Energy from Renewable Sources	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency	Transport, heat pumps, coal, oil, gas, electricity, renewables	Annual statistics for Share of Energy from Renewable Sources Transport, heat pumps, coal, oil, gas, electricity, renewables
Disaggregation of final energy consumption in households	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Energy Policy and Energy Efficiency	Solid fuels, renewables,electrical energy	Annual statistics for disaggregation of final energy consumption in households Solid fuels, renewables,electrical energy
Short term monthly natural gas	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Hydrocarbons	- Natural gas supplied to the consumer (Nm³, TJ, kWh) per system operator - Network losses (Nm³, TJ, kWh) per system operator - Total injection into the marked area (Nm³, TJ, kWh) per system operator Interconnected grid (data from system operator) - Physical imports (Nm³, TJ) per interconnector - Physical exports (Nm³, TJ) per interconnector Production - Physical production (Nm³, TJ) per production facility	Short term monthly natural gas statistics For the sectors below and the following energy products: natural gas Production Trade (imports /exports) closing stocks stock change supply
Short term monthly oil	Ministry of Environment and Energy, General Secretariat for Energy and Mineral Resources, Directorate for Hydrocarbons	1. Refinery gas 2. LPG 3. Naphtha 4. Aviation gas 5. Gasoline as feedstock 6. Gasoline type jet fuel 7. Kerosene as feedstock 8. Kerosene type jet fuel 9. other kerosene 10. other kerosene 11. Gasoil as feedstock 12. other gasoil 13. Residual fuel oil as feedstock 14. Lubricants 15. Paraffin 16. Bitumen 17. Crude oil 18. other products 19. losses	Short-term monthly oil statistics For the sectors below with some of the following energy products: Crude oil; LPG; Naphtha; Gasoline; Total kerosene; Gas/diesel oil; Fuel oil; Other products; Refinery (intake and output) Demand Production Trade (imports / exports) Stocks

3.2. Classification system

See table below.

3.2.1. Classification system – industry sector, products and geographical

Name of the national data collection	Industry sector	Products	Geographical
Monthly electricity	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Monthly solid	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Monthly natural gas	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Monthly oil	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Annual electricity	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Annual solid	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Annual natural gas	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Annual oil	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Annual renewables	NACE rev. 2 (EU classification of economic activities), regulation amendment (EC) 132/2022 on energy statistics	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD_08
Share of Energy from Renewable Sources	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Disaggregation of final energy consumption in households	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Short term monthly natural gas	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD
Short term monthly oil	NACE rev. 2 (EU classification of economic activities)	Classification in Regulation (EC) 1099/2008 on energy statistics	National classification: STAKOD

3.3. Coverage - sector

Energy statistics data covers all major sectors of the economy that are involved in the production, trade, energy transformation or energy consumption.

3.4. Statistical concepts and definitions

Definitions of Regulation (EC) No 1099/2008 on energy statistics apply.

3.5. Statistical unit

See table below.

3.5.1. Statistical unit – Data collections

Name of the national data collection	Reporting unit
Monthly electricity	Electricity producers and suppliers and system operators provide the information requested.
Monthly solid	Coal mines provide the information requested.
Monthly natural gas	System operators and production company provide the information requested
Monthly oil	Provider companies provide the information requested
Annual electricity	Electricity producers and suppliers and system operators provide the information requested.
Annual solid	Coal mines provide the information requested.
Annual natural gas	Provider companies, system operators and production company provide the information requested
Annual oil	Provider companies provide the information requested
Annual renewables	Provider and producer companies provide the information requested
Share of Energy from Renewable Sources	Producers, suppliers and system operators provide the information requested
Disaggregation of final energy consumption in households	Households provide the information requested
Short term monthly natural gas	System operators and production company provide the information requested
Short term monthly oil	all obligated parties

3.6. Statistical population

All the datasets mentioned at 3.5.1 paragraph are gathered through census , except for disaggregation of final energy consumption in households, which is based on a survey contacted by NSA.

3.7. Reference area

The national territory.

3.8. Coverage - Time

See table below.

3.8.1. Coverage time – Data collections

Name of the national data collection	Coverage time
Monthly electricity
Monthly solid
Monthly natural gas
Monthly oil
Annual electricity	Available since 1990.
Annual solid	Available since 1990.
Annual natural gas	Available since 1990.
Annual oil	Available since 1990.
Annual renewables	Available since 1990.
Share of Energy from Renewable Sources	Available since 2004.
Disaggregation of final energy consumption in households	Available since 2020.
Short term monthly natural gas
Short term monthly oil

3.9. Base period

Not applicable.

4. Unit of measure

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See table below.

4.1. Unit of measure – data collections

Name of the national data collection	Unit of measurement
Monthly electricity	GWh
Monthly solid	ktonnes
Monthly natural gas	MJ, GJ, TJ m³
Monthly oil	ktonnes
Annual electricity	MWh, GWh, TWh, ktonnes
Annual solid	ktonnes
Annual natural gas	MJ, GJ, TJ m³
Annual oil	ktonnes
Annual renewables	MJ, GJ, TJ kW, MW, GW m³ ktonnes
Share of Energy from Renewable Sources	GWh MWh ktonnes
Disaggregation of final energy consumption in households	GWh TJ ktonnes
Short term monthly natural gas	MJ, GJ, TJ m³
Short term monthly oil	ktonnes

5. Reference Period

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See table below.

5.1. Reference period – data collections

Name of the national data collection	Reference period
Monthly electricity	1 month
Monthly solid	1 month
Monthly natural gas	1 month
Monthly oil	1 month
Annual electricity	1 year
Annual solid	1 year
Annual natural gas	1 year
Annual oil	1 year
Annual renewables	1 year
Share of Energy from Renewable Sources	1 year
Disaggregation of final energy consumption in households	1 year
Short term monthly natural gas	1 month
Short term monthly oil	1 month

6. Institutional Mandate

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6.1. Institutional Mandate - legal acts and other agreements

See table below.

6.1.1. National legal acts and other agreements

Name of the national data collection	National legal framework	Reference of national legal text
Monthly electricity	Mandatory (included in a national legal act)	Regulation 1099/08. National legal framework: L.3054/2002, L.3734/2009, L.3851/10, L.3832/10, L.4233/2014.
Monthly solid	Mandatory (included in a national legal act)	Regulation 1099/08. National legal framework: L.3054/2002, L.3734/2009, L.3851/10, L.3832/10, L.4233/2014.
Monthly natural gas	Mandatory (included in a national legal act)	Apart from Reg. 1099/2008, presidential decree 132/2017 , L. 4233/2014
Monthly oil	Mandatory (included in a national legal act)	Mandatory, as a result of law 3054/2002 and 4233/2014
Annual electricity	Mandatory (included in a national legal act)	Regulation 1099/08. National legal framework: L.3054/2002, L.3734/2009, L.3851/10, L.3832/10, L.4233/2014.
Annual solid	Mandatory (included in a national legal act)	Regulation 1099/08. National legal framework: L.3054/2002, L.3734/2009, L.3851/10, L.3832/10, L.4233/2014.
Annual natural gas	Mandatory (included in a national legal act)	Apart from Reg. 1099/2008, presidential decree 132/2017 , L. 4233/2014
Annual oil	Mandatory (included in a national legal act)	Mandatory by the law 3054/2002 and 4233/2014.
Annual renewables	Mandatory (included in a national legal act)	Regulation 1099/08. National legal framework: L.3054/2002, L.3734/2009, L.3851/10, L.3832/10, L.4233/2014.
Share of Energy from Renewable Sources	Mandatory (included in a national legal act)	Regulation 1099/08. National legal framework: L.3054/2002, L.3734/2009, L.3851/10, L.3832/10, L.4233/2014.
Disaggregation of final energy consumption in households	Mandatory (included in a national legal act)	Regulation 1099/08. National legal framework: L.3054/2002, L.3734/2009, L.3851/10, L.3832/10, L.4233/2014.
Short term monthly natural gas	Mandatory (included in a national legal act)	Apart from Reg. 1099/2008, presidential decree 132/2017 , L. 4233/2014
Short term monthly oil	Mandatory (included in a national legal act)	Mandatory by the law 3054/2002 and 4233/2014.

6.2. Institutional Mandate - data sharing

See table below.

6.2.1. Institutional mandate – data sharing – national data collections

Name of the national data collection	Situation, if more than 1 body is involved in this data collection	Degree of integration of this data collection among different National bodies
Monthly electricity	Not applicable.	Not applicable.
Monthly solid	Not applicable.	Not applicable.
Monthly natural gas	Not applicable.	Not applicable.
Monthly oil	Not applicable.	Not applicable.
Annual electricity	Not applicable.	Not applicable.
Annual solid	Not applicable.	Not applicable.
Annual natural gas	Not applicable.	Not applicable.
Annual oil	Not applicable.	Not applicable.
Annual renewables	Coordination with CRES (legal entity under Ministry of Environment and Energy)	Not applicable.
Share of Energy from Renewable Sources	Coordination with CRES	Not applicable.
Disaggregation of final energy consumption in households	Coordination between the Ministry of Environment & Energy and the NSA.	Not applicable.
Short term monthly natural gas	Not applicable.	Not applicable.
Short term monthly oil	Not applicable.	Not applicable.

7. Confidentiality

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Annexes:
Confidential data points.

7.1. Confidentiality - policy

Regulation (EC) No 223/2009 on European statistics applies. Also, statistical confidentiality is guaranteed in Law 3832/2010 (article 8) as well as in Law 4233/2014 (article 27 par. 2).

7.2. Confidentiality - data treatment

Data are disseminated only if the statistical confidentiality is guaranteed.

7.2.1. Confidentiality – EU data collections

EU DATA COLLECTION	CONFIDENTIAL DATA POINTS
Crude oil imports register – Short term monthly statistics	No
Oil and petroleum products – Short term monthly statistics	No
Natural gas - short term monthly statistics	No
Solid fuels - monthly statistics	No
Electricity - monthly statistics	No
Oil and petroleum products - monthly statistics	No
Natural gas - monthly statistics	No
Nuclear - annual statistics	No
Electricity and heat - annual statistics	No
Natural gas - annual statistics	No
Oil and petroleum products - annual statistics	No
Renewables and wastes - annual statistics	No
Solid fossil fuels and manufactured gases - annual statistics	No
Short Assessment of Renewable Energy Sources (SHARES)	No
Households - detailed annual statistics on final energy consumption	No

8. Release policy

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8.1. Release calendar

Not available.

8.2. Release calendar access

Not available.

8.3. Release policy - user access

Energy balance is uploaded on Ministry’s website and is available to all users at the same time.

9. Frequency of dissemination

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See table below.

9.1. Frequency of dissemination – national data collections

Name of the national data collection	Frequency of dissemination
Monthly electricity survey	Not available.
Monthly solid survey	Not available.
Monthly natural gas survey	Not available.
Monthly oil statistics	Not available.
Annual electricity survey	Annual.
Annual solid survey	Annual.
Annual natural gas survey	Annual.
Annual oil survey	Annual.
Annual renewables survey	Annual.
Share of Energy from Renewable Sources	Not available.
Households - detailed annual statistics on final energy consumption	Not available.
Short term monthly natural gas	Not available.
Short term monthly oil	Not available.

10. Accessibility and clarity

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10.1. Dissemination format - News release

Not available .

10.2. Dissemination format - Publications

Not available .

10.3. Dissemination format - online database

Not available .

10.3.1. Data tables - consultations

Not available .

10.4. Dissemination format - microdata access

Micro data are not disseminated. However, access to them is granted provided that the statistical principles, especially confidentiality, are applied.

10.5. Dissemination format - other

Not available.

10.5.1. Metadata - consultations

Not available.

10.6. Documentation on methodology

Although in practice we apply the norms and rules deriving from the Eurostat’s methodology, there is no support documentation.

10.6.1. Metadata completeness - rate

Not available.

10.7. Quality management - documentation

Although in practice we apply the norms and rules deriving from the Eurostat’s methodology, there is no support documentation.

11. Quality management

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11.1. Quality assurance

We follow all the basic guidelines and instructions provided by the NSA. Once a year, we submit to the NSA an annual report on the outcome of the statistical work programme of the previous year. There is a thorough review of the key statistical outputs with the aim to resolve emerging problems in the process and to improve and maintain a significant level of qualitative work.

11.2. Quality management - assessment

See table below.

11.2.1. Quality assessment – data collections

Name of the national data collection	Most important quality problem of this data collection	Measures taken in the last 5 years to improve quality of the data collection
Monthly electricity	Not available.	Not available.
Monthly solid	Not available.	Not available.
Monthly natural gas	Not available.	Marginal changes to the default questionnaire sent to the obligated companies.
Monthly oil	Not available.	An IT platform has been set up in order to acquire comparable data
Annual electricity	Better estimation of distribution losses.	We plan to estimate distribution losses using the ratio of the previous year and revise when actual data are available.
Annual solid	Not available.	Not available.
Annual natural gas	Not applicable.	Marginal changes to the default questionnaire sent to the obligated companies
Annual oil	Not available.	An IT platform has been set up in order to acquire comparable data
Annual renewables	Not applicable.	Marginal changes to the default questionnaire sent to the obligated companies
Share of Energy from Renewable Sources	Not available.	Not available.
Households - detailed annual statistics on final energy consumption	Not available.	Not available.
Short term monthly natural gas	Not available.	Marginal changes to the default questionnaire sent to the obligated companies
Short term monthly oil	Not available.	Marginal changes to the default questionnaire sent to the obligated companies

12. Relevance

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12.1. Relevance - User Needs

The data produced are an important source of information for domestic and international users. Moreover data outputs are used to measure progress concerning existing targets and also contribute to policy making. For all data collections, users contact directly the competent service requesting information.

12.2. Relevance - User Satisfaction

Not available.

12.3. Completeness

The majority of the data needed are available. However there was a request for derogation regarding further disaggregation in final consumption in industry due to non availability of data.

12.3.1. Data completeness - rate

See table below.

12.3.1.1. Data completeness - rate – EU data collections

EU DATA COLLECTION	DATA COMPLETENESS - RATE	NUMBER OF MISSING DATA POINTS
Crude oil imports register – Short term monthly
Oil and petroleum products – Short term monthly
Natural gas - short term monthly		Zero.
Solid fuels - monthly		Zero.
Electricity - monthly		Zero.
Oil and petroleum products - monthly
Natural gas - monthly		Zero.
Nuclear - annual		Not applicable.
Electricity and heat - annual		Zero.
Natural gas - annual		Zero.
Oil and petroleum products - annual
Renewables and wastes - annual	≈70
Solid fossil fuels and manufactured gases - annual		Zero.
SHort Assessment of Renewable Energy Sources (SHARES)	≈70
Households - detailed annual statistics on final energy consumption

13. Accuracy

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Annexes:
Accuracy indicators.

13.1. Accuracy - overall

See table below.

13.1.1. Accuracy – most common errors for specific data collections

Name of the national data collection	Most common errors for this collection
Monthly electricity	Not available.
Monthly solid	Not available.
Monthly natural gas	Not available.
Monthly oil	Not available.
Annual electricity	Classification errors
Annual solid	Not available.
Annual natural gas	Classification errors
Annual oil	Not available.
Annual renewables	Not available.
Share of Energy from Renewable Sources	Not available.
Households - detailed annual statistics on final energy consumption	Not available.
Short term monthly natural gas	Not available.
Short term monthly oil	Not available.

13.2. Sampling error

In most cases sampling errors do not exist due to the fact that the statistical outputs are based on census processes.

13.2.1. Sampling error - indicators

In most cases sampling errors do not exist due to the fact that the statistical outputs are based on census processes.

13.3. Non-sampling error

Non-sampling errors do not exist due to the fact that the statistical outputs are mostly based on census processes.

13.3.1. Coverage error

We are not aware of any over-coverage in the data.

13.3.1.1. Over-coverage - rate

See annex.

13.3.1.2. Common units - proportion

See annex.

13.3.2. Measurement error

See annex.

13.3.3. Non response error

See annex.

13.3.3.1. Unit non-response - rate

See annex.

13.3.3.2. Item non-response - rate

See annex.

13.3.4. Processing error

Not available.

13.3.5. Model assumption error

Not available.

14. Timeliness and punctuality

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14.1. Timeliness

See table below.

14.1.1. Time lag - first result

Monthly electricity - The first version of monthly electricity questionnaire for December 2020 was sent 46 days from the last day of the reference period (15.02.2021). The average of the days from the last day of the reference period until the first day of monthly electricity questionnaire sent is 38 days for the year 2020.

Monthly solid - The first version of monthly solid questionnaire for December 2020 was sent 46 days from the last day of the reference period (15.02.2021). The average of the days from the last day of the reference period until the first day of monthly solid questionnaire sent is 39 days for the year 2020.

Monthly natural gas - The first version of monthly natural gas questionnaire for December 2020 was sent 54 days from the last day of the reference period. The average of the days from the last day of the reference period until the first day of monthly natural gas questionnaire sent is 49 days for the year 2020.

Annual electricity -The first version of annual electricity questionnaire for 2018 was sent 335 days from the last day of the reference period (30.11.2019).The first version of annual electricity questionnaire for 2019 was sent 335 days from the last day of the reference period (30.11.2020). The first version of annual electricity questionnaire for 2020 was sent 335 days from the last day of the reference period (30.11.2021).

Annual solid - The first version of annual solid questionnaire for 2018 was sent 335 days from the last day of the reference period (30.11.2019).The first version of annual solid questionnaire for 2019 was sent 335 days from the last day of the reference period (30.11.2020). The first version of annual solid questionnaire for 2020 was sent 267 days from the last day of the reference period (23.09.2021).

Annual natural gas - The first version of annual natural gas questionnaire for 2018 was sent 335 days from the last day of the reference period (30.11.2019). The first version of annual natural gas questionnaire for 2019 was sent 335 days from the last day of the reference period (30.11.2020). The first version of annual natural gas questionnaire for 2020 was sent 335 days from the last day of the reference period (30.11.2021).

Annual oil -The first version of annual oil questionnaire for 2018 was sent 335 days from the last day of the reference period (30.11.2019). The first version of annual oil questionnaire for 2019 was sent 363 days from the last day of the reference period (28.12.2020). The first version of annual oil questionnaire for 2020 was sent 350 days from the last day of the reference period (15.12.2021).

Annual renewables - The first version of annual electricity questionnaire for 2018 was sent 335 days from the last day of the reference period (30.11.2019).The first version of annual electricity questionnaire for 2019 was sent 335 days from the last day of the reference period (30.11.2020).The first version of annual electricity questionnaire for 2020 was sent 335 days from the last day of the reference period (30.11.2021).

Share of Energy from Renewable Sources - The first version of Share of Energy from Renewable Sources questionnaire for 2018 was sent 354 days from the last day of the reference period (20.12.2019).The first version of Share of Energy from Renewable Sources questionnaire for 2019 was sent 345 days from the last day of the reference period (11.12.2020).The first version of Share of Energy from Renewable Sources questionnaire for 2020 was sent 343 days from the last day of the reference period (09.12.2021).

Households - detailed annual statistics on final energy consumption -The first version of Households - detailed annual statistics on final energy consumption questionnaire for 2020 was sent 453 days from the last day of the reference period (28.03.2022).

Short term monthly natural gas -The first version of monthly natural gas questionnaire for December 2020 was sent 29 days from the last day of the reference period. The average of the days from the last day of the reference period until the first day of monthly natural gas questionnaire sent is 19 days for the year 2020.

14.1.2. Time lag - final result

Monthly electricity-The revised version of monthly electricity questionnaire for December 2020 was sent 321 days from the last day of the reference period (18.10.2021).

Monthly solid -The revised version of monthly solid questionnaire for January 2020 was sent 88 days from the last day of the reference period (28.04.2020).The revised version of monthly solid questionnaire for January 2020 was sent 59 days from the last day of the reference period (28.04.2020).The revised version of monthly solid questionnaire for March 2020 was sent 83 days from the last day of the reference period (22.06.2020).The revised version of monthly solid questionnaire for April 2020 was sent 53 days from the last day of the reference period (22.06.2020).The revised version of monthly solid questionnaire for July 2020 was sent 249 days from the last day of the reference period (06.04.2021).The revised version of monthly solid questionnaire for August 2020 was sent 218 days from the last day of the reference period (06.04.2021).The revised version of monthly solid questionnaire for October 2020 was sent 157 days from the last day of the reference period (06.04.2021).

Annual electricity - The revised version of annual electricity questionnaire for 2018 was sent 413 days from the last day of the reference period (17.02.2020).The revised version of annual electricity questionnaire for 2019 was sent 456 days from the last day of the reference period (31.03.2021). The revised version of annual electricity questionnaire for 2020 was sent 454 days from the last day of the reference period (30.03.2022).

Annual solid - The revised version of annual solid questionnaire for 2018 was sent 382 days from the last day of the reference period (17.01.2020).The revised version of annual solid questionnaire for 2019 was sent 433 days from the last day of the reference period (08.03.2021). The revised version of annual solid questionnaire for 2020 was sent 362 days from the last day of thereference period (28.12.2021).

Annual natural gas - The revised version of annual natural gas questionnaire for 2018 was sent 409 days from the last day of the reference period (13.02.2020). The revised version of annual natural gas questionnaire for 2020 was sent 418 days from the last day of the reference period (22.02.2022).

Annual oil - The revised version of annual oil questionnaire for 2018 was sent 382 days from the last day of the reference period (17.01.2020).The revised version of annual oil questionnaire for 2019 was sent 462 days from the last day of the reference period (07.04.2021). The revised version of annual oil questionnaire for 2020 was sent 459 days from the last day of the reference period (04.04.2022).

Annual renewables -The revised version of annual electricity questionnaire for 2018 was sent 521 days from the last day of the reference period (04.06.2020).The revised rst version of annual electricity questionnaire for 2019 was sent 455 days from the last day of the reference period (31.03.2021).The revised version of annual electricity questionnaire for 2020 was sent 455 days from the last day of the reference period (30.03.2022).

Share of Energy from Renewable Sources -The revised version of Share of Energy from Renewable Sources questionnaire for 2018 was sent 616 days from the last day of the reference period (07.09.2020).The revised version of Share of Energy from Renewable Sources questionnaire for 2019 was sent 345 days from the last day of the reference period (11.12.2020).The revised version of Share of Energy from Renewable Sources questionnaire for 2020 was sent 343 days from the last day of the reference period (09.12.2021).

14.1.3. Timeliness – deadlines for data transmission for each national data collection

Name of the national data collection	Deadline for data transmission
Monthly electricity	2 months after the end of the reference period
Monthly solid	2 months after the end of the reference period
Monthly natural gas	2 months after the end of the reference period
Monthly oil	2 months after the end of the reference period
Annual electricity	11 months after the end of the reference period
Annual solid	11 months after the end of the reference period
Annual natural gas	11 months after the end of the reference period
Annual oil	11 months after the end of the reference period
Annual renewables	11 months after the end of the reference period
Share of Energy from Renewable Source	11 months after the end of the reference period
Households - detailed annual statistics on final energy consumption	3 months after the end of reference period
Short term monthly natural gas	1 month after the end of the reference period
Short term monthly oil

14.2. Punctuality

Almost all questionnaires were delivered on time.

14.2.1. Punctuality - delivery and publication

Not available.

15. Coherence and comparability

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15.1. Comparability - geographical

Not applicable.

15.1.1. Asymmetry for mirror flow statistics - coefficient

Not applicable.

15.2. Comparability - over time

Comparability over time is ensured both among aggregated and disaggregated data.

15.2.1. Length of comparable time series

Times series for annual data are available from 1990 onwards.

15.3. Coherence - cross domain

Statistical outputs are compared with other statistical or administrative data that provide the same or similar information on the same domain, as well as divergences originating from different sources are identified.

15.3.1. Coherence - sub annual and annual statistics

There are not significant discrepancies between sub annual and annual data do not appear. However, annual outputs are often more accurate.

15.3.2. Coherence - National Accounts

Not available.

15.4. Coherence - internal

Internal coherence is ensured both among aggregated and disaggregated data.

16. Cost and Burden

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Software and communication tools are used in order to optimise the statistical process. In certain occasions (e.g., application for gathering oil data – www.fuelstats.gr) a platform is installed thus providing the respondents with an automated tool.Moreover, taking into account that the statistical outputs are mostly based on census processes, the response burden concerns all data providers, that are obliged to submit their answers, either hard copy or electronically. Total cost and burden,as well as the evaluation of resources’ use are difficult to be calculated.

17. Data revision

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17.1. Data revision - policy

Data are generally revised in order to incorporate new, improved information. In addition, errors in the computation of statistics are corrected. In this way data users are supplied with the best possible results.

17.2. Data revision - practice

Whenever data are submitted as provisional, a revision follows as soon as the final data are available. In case one or more data providers submit a revision, values are recalculated and submitted as soon as possible.

17.2.1. Data revision - average size

Not available.

18. Statistical processing

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18.1. Source data

See table below.

18.1.1. Source data – data collections

Name of the national data collection	Main data collection method	Target population	Population frame	Sample size
Monthly electricity	Statistical compilation	4	4	4
Monthly solid	Statistical compilation	5	5	5
Monthly natural gas	Statistical compilation	3	3	3
Annual electricity	Statistical compilation	2	2	2
Annual solid	Statistical compilation	10	10	10
Annual natural gas	Statistical compilation	22	22	22
Annual renewables	Statistical compilation	50	50	50
Short term monthly natural gas	Statistical compilation	3	3	3

18.2. Frequency of data collection

See table below.

18.2.1. Frequency of data collection – national data collections

Name of the national data collection	Frequency of transmission
Monthly electricity	Once per month
Monthly solid	Once per month
Monthly natural gas	Once per month
Monthly oil	Once per month
Annual electricity	Once per year
Annual solid	Once per year
Annual natural gas	Once per year
Annual oil	Once per year
Annual renewables	Once per year
Share of Energy from Renewable Source	Once per year
Households - detailed annual statistics on final energy consumption	Once per year
Short term monthly natural gas	Once per month
Short term monthly oil	Once per month

18.3. Data collection

The statistical outputs are based mostly on census processes. All data providers are obliged to submit their answers, either hard copy or electronically. However, if possible, the use of administrative data is preferred, provided that statistical standards are not affected. Statistical outputs are compared with other statistical or administrative data that provide the same or similar information on the same domain, as well as divergences originating from different sources are identified.

18.4. Data validation

There are procedures to validate the intermediate results and the statistical output, namely recourse to intermediate agencies or pools of independent authorities. At all stages of the statistical process double checks are carried out to reduce any errors.

18.4.1. Data validation – national data collections

Name of the national data collection	Operations performed to this collection in order to improve data quality (e.g. checks between monthly, quarterly and annual, verification of time series, investigation of outliers…)
Monthly electricity	Checks are run for discrepancies through the annual clearing.
Monthly solid	Checks are run for discrepancies through the annual clearing.
Monthly natural gas	The accuracy of the reported data can be checked using technical information / knowledge.
Monthly oil	From time to time there is an overall revision when major discrepancies arise
Annual electricity	The accuracy of the reported gross production and its breakdown can be checked using technical information / knowledge, additional data to be reported in the surveys and cross checking with other questionnaires.
Annual solid	The accuracy of the reported inland consumption and its breakdown can be checked using technical information / knowledge.
Annual natural gas	The accuracy of the reported inland consumption and its breakdown can be checked using technical information / knowledge and cross checking with other questionnaires.
Annual oil	Automated data validation on respondent level.
Annual renewables	The accuracy of the reported data and its breakdown can be checked using technical knowledge (e.g. input of primary energy, calculation of efficiency factors etc.).
Share of Energy from Renewable Source	The accuracy can be checked using technical information / knowledge and cross checking with other questionnaires.
Households - detailed annual statistics on final energy consumption	The accuracy can be checked using technical information / knowledge and cross checking with other questionnaires.
Short term monthly natural gas	The accuracy of the reported inland consumption and its breakdown can be checked using technical information / knowledge.
Short term monthly oil	Automated data validation on respondent level

18.5. Data compilation

See table below.

18.5.1. Imputation - rate

Not available.

18.5.2. Data compilation – data collections

Name of the national data collection	Additional techniques used for the compilation of the final data set	Details
Monthly electricity	Confidentiality techniques Cross-checking techniques Incorrect data is adjusted or corrected
Monthly solid	Confidentiality techniques Cross-checking techniques Incorrect data is adjusted or corrected
Monthly natural gas	Cross-checking techniques Outliers are aligned or streamlined Incorrect data is adjusted or corrected
Monthly oil	Confidentiality techniques Cross-checking techniques Outliers are aligned or streamlined Incorrect data is adjusted or corrected	Automated data validation on respondent level.
Annual electricity	Confidentiality techniques Cross-checking techniques Outliers are aligned or streamlined Incorrect data is adjusted or corrected	All annually reported data is compared to the monthly surveys. The accuracy of the reported gross production and its breakdown can be checked using technical information / knowledge and additional data to be reported in the surveys (e.g. input of primary energy, calculation of efficiency factors etc.).
Annual solid	Confidentiality techniques Cross-checking techniques Outliers are aligned or streamlined Incorrect data is adjusted or corrected
Annual natural gas	Imputing missing/non-response rate Grossing up the sample Outliers are aligned or streamlined
Annual oil	Confidentiality techniques Cross-checking techniques Outliers are aligned or streamlined Incorrect data is adjusted or corrected	Automated data validation on respondent level
Annual renewables	Confidentiality techniques Cross-checking techniques Incorrect data is adjusted or corrected	The accuracy of the reported gross production and its breakdown can be checked using technical information / knowledge and additional data to be reported in the surveys.
Share of Energy from Renewable Source	Confidentiality techniques Cross-checking techniques Incorrect data is adjusted or corrected
Households - detailed annual statistics on final energy consumption	Confidentiality techniques Cross-checking techniques Incorrect data is adjusted or corrected
Short term monthly natural gas	Confidentiality techniques Cross-checking techniques	The accuracy of the reported gross production and its breakdown can be checked using technical information / knowledge and additional data to be reported in the surveys.
Short term monthly oil	Confidentiality techniques Cross-checking techniques	Automated data validation on respondent level

18.6. Adjustment

Not available.

18.6.1. Seasonal adjustment

Not applicable.

19. Comment

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Related metadata

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Annexes

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Accuracy indicators.
Confidential data points.