Natural Gas Stocks Injection in Slovakia increased to 128 GWh/d on Sunday May 24 from 121.52 in the previous day. Natural Gas Stocks Injection in Slovakia averaged 86.86 GWh/d from 2011 until 2026, reaching an all time high of 378.61 GWh/d in May of 2019 and a record low of 0.00 GWh/d in January of 2011.