Gazprom Signs 5-year Gas Supply Deal with Slovenia Posted by Michelle Howard April 13, 2018 Russian gas giant Gazprom said on Friday it has signed a 5-year gas supply deal with Slovenia. The deal is valid from Jan. 1, 2018 to Jan. 1, 2023, with supply volumes set at 600 million cubic metres of gas per year. Last year, Gazprom shipped 607.2 million cubic metres of gas to Slovenia. Reporting by Vladimir Soldatkin Email