EIA Weekly Natural Gas Storage Analysis: 2026-03-13

Executive Summary

The EIA reported a net injection of +35 Bcf for the week ending March 13, an unseasonably early build that points to a loose supply/demand balance. This injection pushed total working gas inventories above both year-ago and 5-year average levels, a fundamentally bearish signal driven primarily by builds in the South Central region as winter heating demand fades.

Storage Snapshot

• Total Lower 48: Working gas in storage increased to 1,883 Bcf.
• Implied Flow: A net injection (build) of +35 Bcf.
• Comparisons: Storage levels are now 10.4% above this time last year (1,706 Bcf) and 2.6% above the 5-year average (1,836 Bcf).
• Regional Driver: The South Central region was the primary driver of the national build, injecting +26 Bcf. In contrast, the Midwest and Pacific regions posted small draws of -1 Bcf each. There is a notable divergence, with Mountain (+62.1%) and Pacific (+54.5%) regions holding significant surpluses to their 5-year averages, while the East (-10.7%) and Midwest (-13.2%) remain in deficit.

Implications

An injection of this size in mid-March is a strong indicator that the market is oversupplied. The transition from the winter withdrawal season to the spring injection season appears to be happening earlier than normal, suggesting that heating demand has collapsed while production remains robust. This storage trajectory is bearish for natural gas prices, as it alleviates concerns about end-of-winter inventory levels and sets a well-supplied backdrop for the start of the traditional injection season. The data contained no revision or reclassification flags.

Risks and Context

• Weather Sensitivity: This report reflects a period of weak weather-driven demand. The primary near-term risk to this bearish outlook would be a late-season cold blast that could temporarily tighten the market and induce further withdrawals.
• Injection Season Trajectory: While this single report is bearish, the market's focus will now shift to the pace of injections through the spring and summer. The trajectory will be determined by summer cooling demand (power burn), LNG export utilization, and any changes in production levels, which will collectively determine whether the current surplus to the 5-year average expands or contracts.