The Lower 48 states increased natural gas storage capacity in 2025, with demonstrated peak capacity up 6 billion cubic feet and design capacity up 26 billion cubic feet, the US Energy Information Administration said Wednesday.
The agency said demonstrated peak capacity, which measures the highest storage volumes reached during the previous five years, increased 0.1% and marked a third consecutive annual gain.
The largest gains came from the Mountain region, where demonstrated peak capacity increased by 18 Bcf, and the South Central region, which added 16 Bcf, according to the agency.
Demonstrated peak capacity declined by 15 Bcf in the East region, while the Pacific region lost 8 Bcf and the Midwest region recorded a 5 Bcf decrease, the agency said.
The EIA said working gas design capacity, which reflects the maximum storage volume facilities can hold based on their design specifications, climbed to 4,683 Bcf in November 2025 from 4,657 Bcf a year earlier.
South Central storage sites added 21 Bcf of design capacity, while the Mountain region increased capacity by 6 Bcf, the EIA added.
The East region reduced design capacity by 2 Bcf because of base gas adjustments, while capacity in the Pacific and Midwest regions remained unchanged from the previous year.