Natural Gas Prices Struggle as Inventory Cushion Grows

The U.S. natural gas storage situation is looking more than comfortable heading into winter, with inventories sitting at 148 billion cubic feet above the five-year average.

As of September 10, Lower 48 working gas stood at 3,254 Bcf for the week ended September 4, up 40 Bcf from the prior week, according to the Energy Information Administration's report.

The build was mainly concentrated in the East and Midwest, adding 20 Bcf and 18 Bcf respectively, while South Central inventories fell by 7 Bcf. The national total rose, but this is where the story gets complex: a closer look reveals that salt caverns are not behaving as expected.

These facilities are disproportionately useful when demand jumps suddenly, representing only about 10% of Lower 48 storage capacity but 28% of daily deliverability, according to an EIA analysis. Yet they drew just 11 Bcf to 227 Bcf, which is 3.8% below their five-year average.

The EIA's September Short-Term Energy Outlook projects a comfortable start to winter, with working gas expected to hit 3,969 Bcf on October 31-5% above the five-year average and 1% above October 2025. This supports the base case that supply will continue to grow.

However, there is an opposing view: LNG demand could erode the surplus faster than the current price implies. The EIA outlook puts U.S. LNG exports at 17.4 Bcf per day in 2026, up from 15.1 Bcf per day in 2025, a rise of roughly 15%.

The next clean test for natural gas prices arrives with the EIA's September 17 storage report. Bulls need either a materially smaller build than expected or a renewed demand shock to move prices decisively above $3.