Henry Hub Basis and Pipeline Constraints

Henry Hub, a physical interconnection point in Louisiana where multiple pipelines meet, is the delivery point behind the main US natural gas futures contract and the price everyone means by "the gas price." But almost no gas actually trades at Henry Hub itself — it trades at hundreds of other hubs across the country, each priced as Henry Hub plus or minus a spread called basis. That spread is mostly a story about pipelines: whether there's enough capacity to move gas from where it's produced to where Henry Hub sets its price, or to where demand actually is.

Why some basis points are steady and others are wild

A hub with generous, underused pipeline capacity into the Henry Hub trading area behaves as transport theory predicts: its basis sits close to the pipeline tariff and barely moves. A hub in a production area that has outgrown its pipeline buildout — a shale basin producing more gas than the pipes out can carry — behaves very differently. When the pipes are full, producers with nowhere to put their gas sell locally for whatever clears the market, even near zero or briefly negative, since gas that can't be moved or stored is worthless once already flowing. That local hub's basis can swing from a modest discount on a normal day to a collapse on a high-production day, decoupled from Henry Hub itself.

The same logic runs in reverse on the demand side: a hub in a region with strong local heating demand but limited pipeline capacity in from elsewhere can trade at a large premium to Henry Hub during a cold snap, because local supply can't be topped up fast enough.

Worked example

Henry Hub trades at $3.00/MMBtu. A production hub in a gas-heavy basin with pipeline takeaway running at 70% of capacity typically sells at a $0.30 discount, i.e. $2.70/MMBtu, reflecting the pipeline tariff to move gas out to demand centers. During an unusually strong production month, pipeline nominations hit 99% of capacity: producers who can't get space are forced to sell locally into whatever demand exists nearby, and the local price briefly falls to $0.50/MMBtu — an $2.50 discount to Henry Hub, more than eight times the "normal" basis — purely because gas produced that day physically cannot leave the region.

What this means in practice

Traders holding physical positions at a specific hub need to hedge basis risk separately from Henry Hub price risk, since a Henry Hub futures hedge alone doesn't protect against the local spread blowing out. Basis swaps — paying the difference between a local hub price and Henry Hub — exist for exactly this, and their pricing reflects the market's expectation of future pipeline utilization there.