Natural Gas Stocks Injection in Portugal increased to 19.78 GWh/d on Monday June 22 from 18.41 in the previous day. Natural Gas Stocks Injection in Portugal averaged 4.95 GWh/d from 2011 until 2026, reaching an all time high of 51.94 GWh/d in January of 2018 and a record low of 0.00 GWh/d in January of 2011.