Natural Gas Stocks Inventory in Slovakia increased to 15.51 TWh on Thursday July 23 from 15.43 in the previous day. Natural Gas Stocks Inventory in Slovakia averaged 25.57 TWh from 2020 until 2026, reaching an all time high of 41.03 TWh in January of 2020 and a record low of 6.22 TWh in March of 2022.