Natural gas in Slovenia

The supply of natural gas in Slovenia began in 1974 with the signing of an agreement to pool funds to implement a programme to supply natural gas to Slovenia. Construction of the gas transmission network began in 1977. A year later, the network was put into use with the supply of the first customers in Slovenia and for transmission to Croatia. Natural gas comes from a source in Russia. Over the years, the gas transmission network has been expanded, such that natural gas is present in all major Slovenian industrial centres and cities, while the reliability of supply has reached a high level. The next major milestone was achieved in 2004 when the liberalisation of the Slovenian market began.

A total of 1,967 million Sm3 of natural gas was delivered in the transmission network in 2012. Of this amount, the transmission to other (foreign) transmission networks accounted for 1,103 million Sm3. Own use of the transmission network was 1.6 million Sm3. The consumption of natural gas by Slovenian customers was around 862 million Sm3. By purchasing natural gas from various sources, Geoplin provides its customers a smooth and reliable supply.

Due to a lack of own resources in terms of natural gas supply, Slovenia is fully reliant on deliveries from abroad. In 2012 the majority of natural gas was imported from Russia (42%), Austria (35%) and Algeria (16%). The remaining quantities were imported from Italy and other countries. Transmission to end-customers is performed reliably and without interruption via the natural gas transmission network system operator, Plinovodi d.o.o., and via distribution network system operators.

In 2012 there were 131,515 natural gas customers in 76 local communities connected to the Slovenian gas transmission network, an increase of 1% on 2011. A total of 307 million Sm3 of natural gas was sold on the wholesale market, where natural gas is purchased for resale to end-customers. Characteristic of the retail market is the fact that around 70% of natural gas is sold to industrial customers connected directly to the transmission network. The remainder was sold to 131,515 customers, including 118,154 households who consumed around 111 million Sm3 of natural gas, and to 13,361 non-household customers who consumed around 177 million Sm3 of natural gas.

The natural gas market is characterised by declining consumption and a rising number of users. There were 1363 more customers last year than the previous year, while natural gas consumption was down by 35 million Sm3 over the same period, primarily due to the difficult economic conditions and improving energy efficiency. Nevertheless, natural gas remains an important alternative in the supply of energy.


The Slovenian natural gas market is part of the single European natural gas market governed by the European natural gas directive (2009/73/EC).

Annual consumption of around 865 million Sm3 ranks the Slovenian market amongst the smallest in Europe. Geoplin plays an important role in supplying the Slovenian market with natural gas, as it covers the majority of customers’ needs. The proportion of natural gas used as the primary energy source is 10.15% in Slovenia. A total of 99% of natural gas is imported from abroad. 

Source: Energy Agency of the Republic of Slovenia, report on the Energy Sector in Slovenia in 2012.

Gas transmission network in Slovenia

In line with the liberalisation of the natural gas market in the European Union, Geoplin is organised into two companies. On 1 January 2005 the newly established subsidiary Plinovodi d.o.o. took over management of the natural gas infrastructure, and performs the activity of natural gas transmission network system operator (TNSO). Connected to the gas transmission network are natural gas distribution networks, through which distribution network system operators (DNSO) facilitate the distribution of natural gas to 72 Slovenian municipalities. In terms of distribution networks, a DNSO performs similar tasks to those performed by the TNSO on the gas transmission network. 




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