Data for Slovenia and other countries:

Objectives summarised by: /
Source database or source: The data on energy prices is published by SORS in the web application SI-STAT for all consumer groups. SORS has been collecting data since 1991 for electrical energy, and since 1995 for natural gas. Prices for oil derivatives have been available since 1999, while data on prices before this period is available through oil dealers.
Data administrator: Statistical Office of the Republic of Slovenia (SORS) or Eurostat
Methodology and frequency of data collection for the indicator: Data on energy prices is published twice a year; prices that apply on 1st January are published by SORS in the second week of March, and prices for the 1st July of the current year in the second week of September.
Data processing methodology: Energy prices published by SORS are current prices. Since these are nominal categories, the changes in prices do not reflect the real changes. Real changes in prices are reflected only in real prices, calculated by the deflation of nominal prices with a DBP, which is published for each previous year by SORS. Energy prices, shown in the indicator, are real prices; for the calculation, deflators were used that converted the nominal prices to the level of real prices in 1995. The real prices in 1995 were converted into the Euro currency in 1995 by using the average annual exchange rate of the Bank of Slovenia in 1995. Such conversion enables a better comparability of energy prices in Slovenia with average prices in the EU. Real energy prices were calculated as: PR_t = (P_t * (1 / _{1995, t})) / dt₁₉₉₅
PR – real prices
P – current prices
D – deflator
dt – exchange rate.
Information concerning data quality:
- Advantages and disadvantages (at data level): the source of the basic data for the entire time series for electrical energy and natural gas is SORS, which enables a quality and more consistent analysis of an individual sector; only the data on fuel prices prior to 1999 had to be obtained from the largest fuel dealer in Slovenia (Petrol)
- Relevance, accuracy, robustness, uncertainty (at data level):
Reliability of the indicator (archive data): The data reflects the prices by individual consumer groups on the first day in January and July. SORS publishes prices that it previously gets from the suppliers of electrical energy and natural gas, and not directly from energy consumers. In industry, the majority of agreements between suppliers and energy consumers is concluded for several years, while usually the prices inside individual consumers of the same consumer group differ; therefore, it is assumed that SORS' prices most likely do not reflect the actual conditions in this area.
Uncertainty of the indicator (scenarios/projections): Projections have not been prepared.
- Overall assessment (1 = no major comments, 3 = data to be considered with reservation):
Relevance: 1
Accuracy: 2
Completeness over time: 1
Completeness over space: 1

Data for other countries

Source database or source: Eurostat, Oil bulletin: under link Time series – History from 2005 onwards
Data administrator: Eurostat, European Communities, contact: tren-oil-bulletin@ec.europa.eu
Date of acquisition for this indicator: 30 November 2009
Methodology and frequency of data collection for the indicator: The database Oil bulletin contains data on prices of motor fuels by individual Member States on a weekly level. The table contains data on fuel prices with and without considered taxes in EU countries. The prices used were in force on 1st January of an individual year for an individual Member State. The methodology of data collection is described here.
Data processing methodology: Prices for individual countries are determined as a weighted average of the prices in Member States.
Geographical coverage:
The EA-15 is composed of countries that used the Euro as their national currency by the end of 2008: Belgium, Germany, Greece, Spain, France, Ireland, Italy, Cyprus, Luxembourg, the Netherlands, Austria, Portugal, Slovenia and Finland.
The EU-15 group is composed of the old EU Member States (Belgium, Denmark, Germany, Greece, Spain, France, Ireland, Italy, Luxembourg, the Netherlands, Austria, Portugal, Finland, Sweden and the United Kingdom). The EU-10 group is composed of the Member States who joined the EU in 2004 (Cyprus, Malta, Estonia, Lithuania, Latvia, Poland, Czech Republic, Slovakia, Slovenia, and Hungary).
The EU-12 includes besides EU-10 also Romania and Bulgaria. The EU-27 includes the EU-15 and EU-12, while the EU-25 includes the EU-15 and EU-10.
Information concerning data quality:
- Advantages and disadvantages(at data level): The source of the basic data for the entire time series for NMB 95 and D2 is Eurostat, which enables a quality and more consistent as well as transparent analysis of an individual sector.
- Relevance, accuracy, robustness, uncertainty (at data level):
Reliability of the indicator (archive data): Comparison of prices and their trends by Member States most likely does not reflect the actual conditions in an area, primarily due to differences in the quality of products, various market practices and differences in the market structure of motor fuels in EU Member States.
Uncertainty of the indicator (scenarios/projections): Projections have not been prepared.
- Overall assessment (1 = no major comments, 3 = data to be considered with reservation):
Relevance: 1
Accuracy: 2
Completeness over time: 1
Completeness over space: 1

Other sources and literature:
- Resolution on the National Energy Programme (ReNEP), OG RS, no. 57/2004).
- Annual energy survey for 2005. 2007. Ljubljana, Jožef Stefan Institute (contracting authority the Ministry of the Economy).