Natural Gas Stocks Injection in Portugal remained unchanged at 0 GWh/d on Thursday September 4. Natural Gas Stocks Injection in Portugal averaged 4.98 GWh/d from 2011 until 2025, 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.