US natural gas storage increased by 44 billion cubic feet in the week ended September 11, 2026, slightly below market expectations of a 49 bcf injection. The build was significantly smaller than the 87 bcf increase recorded during the same week last year and the five-year average injection of 74 bcf for the period from 2021 to 2025. Total working gas in storage rose to 3.298 trillion cubic feet, leaving inventories around 3.6% below levels recorded in the corresponding week a year earlier but approximately 3.7% above the five-year average. The latest data followed a 40 bcf injection in the previous week ended September 4.