Nat-Gas Prices Tumble as US Gas Inventories Build

October Nymex natural gas prices closed down 3.14% to a one-week low following a larger-than-expected 71 bcf weekly EIA inventory build, which exceeded forecasts and the five-year average, signaling ample US supplies that are currently 6% above their five-year seasonal norm. This bearish pressure is reinforced by near-record US natural gas production and the EIA's upward revision to its 2025 output forecast. However, forecasts for warmer US weather in late September are expected to boost demand for power generation, potentially limiting further near-term price declines.

Analysis

October Nymex natural gas (NGV25) prices declined 3.14% to a one-week low, driven primarily by a bearish weekly EIA report. The report detailed an inventory build of 71 billion cubic feet (bcf) for the week ended September 5, surpassing both the market consensus of +68 bcf and the five-year average of +56 bcf. This has pushed total US natural gas stockpiles to 6.0% above their five-year seasonal average, indicating ample supply. The bearish sentiment is further reinforced by fundamental supply-side strength, including near-record US dry gas production of 107.3 bcf/day (a 7.0% year-over-year increase) and an upward revision by the EIA to its 2025 production forecast. However, further price declines in the immediate term may be limited by a bullish demand-side catalyst. Weather forecasts from Vaisala indicate above-normal temperatures across the US for mid-to-late September, which is expected to boost gas demand from electricity providers to meet increased air conditioning needs. This dynamic is supported by a 1.03% year-over-year rise in electricity output, even as current gas demand and LNG export flows have shown modest weekly and yearly declines.

Key Decisions for Investors

• Investors should recognize the current market tension between bearish supply fundamentals, evidenced by the 71 bcf inventory build and near-record production, and a bullish short-term demand outlook from warmer weather forecasts, suggesting that while downside is cushioned, rallies may be capped by the supply overhang.
• It is critical to monitor upcoming EIA inventory reports and any revisions to late-September weather forecasts, as a larger-than-expected build or a shift to cooler temperatures would likely resolve the current price conflict to the downside.
• From a longer-term strategic perspective, the persistent strength in US production, up 7.0% year-over-year and with an increased 2025 forecast, points to a structural oversupply that could continue to weigh on prices beyond any immediate weather-driven volatility.