Slovak users now hold more than half of Nafta's gas storage capacity: 56.57% in 2025, up from 49.54%
According to the annual report of regulator ÚRSO, Slovak companies used 56.57% of the capacity of Nafta's underground storage facilities in 2025, the country's largest storage operator. The share of British users almost halved, while those of Czech and German companies rose.
EuroEnergy Newsroom · 
Slovakia · 2 min read
Slovak users took up more than half of the capacity of Nafta's underground gas storage facilities in 2025, Slovakia's largest storage operator, according to the 2025 annual report of the Regulatory Office for Network Industries (ÚRSO), analysed on 5 November by the specialist portal Energie-portal.sk.
The figures. According to ÚRSO, Slovak users held 56.57% of Nafta's capacity, followed by users from the United Kingdom (16.16%), Czechia (16.09%) and Germany (11.18%). Compared with 2024, Energie-portal.sk notes, the Slovak share rose from 49.54%, the British share almost halved from 30.98%, and the Czech and German shares grew from 3.88% and 4.12% respectively. At the second operator, Pozagas, foreign users remain dominant: France 37.04%, Switzerland 23.37%, Slovakia 19.79% (up from 16.69% in 2024), Germany 12.66%, Czechia 6.69% and Italy 0.45%.
Capacity. The technical working volume in 2025 was 29,616,000 MWh at Nafta and 6,947,585 MWh at Pozagas, about 36.6 TWh in total, which according to the regulator corresponds to roughly 70% of the country's annual consumption.
Demand. Demand exceeded supply at Nafta: the operator received 150 requests, 99 of which were rejected because the capacity had been allocated to other applicants, and signed 55 firm-capacity contracts. Pozagas received 20 requests and signed 13 contracts. Since 2025, access to storage has been regulated, and ÚRSO has issued price decisions for both operators. Nafta invested €6.2 million and Pozagas €2.8 million.
Context. In April 2026, the government entrusted state-owned SPP, through a service of general economic interest, with responsibility for stocks. On 6 October SPP reached 17.5 TWh in storage, or 35% of annual consumption of about 50 TWh, Economy Minister Denisa Saková announced. According to Energie-portal.sk, data for 2026 show that SPP holds the large majority of the gas now in Slovak storage.
The country's real-time data are on the country page
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