Working natural gas in underground storage, Lower 48 states, billion cubic feet, weekly.
2010–2026 · 873 observationsSource: U.S. Energy Information Administration
EIA Weekly Natural Gas Storage Report series NW2_EPG0_SWO_R48_BCF (Lower 48 working gas in underground storage, Bcf), via the EIA API v2. Storage follows a strong seasonal cycle (injection April-October, withdrawal November-March), but the guard's 40% single-step threshold is not tripped in practice.