Henry Hub vs ERCOT: How Natural Gas Prices Drive Texas Electricity Costs

Why Natural Gas Sets Texas Electricity Prices

ERCOT's electricity market clears on a marginal cost basis. In simple terms: the price of electricity in Texas is determined by the cost of producing the last unit of electricity needed to meet demand.

In Texas, that last unit is almost always gas-fired generation. Natural gas plants produce approximately 50–60% of Texas electricity on a typical summer day, and they set the marginal clearing price for the rest of the market.

The Henry Hub Price Monitor: What Texas Teams Watch

Spot price: The daily Henry Hub spot price at the NYMEX settlement is the most immediate indicator of gas cost pressure. Prices above $4/MMBtu signal watch-level conditions. Above $6/MMBtu, Texas energy cost pressure becomes significant.

Weekly storage reports: EIA publishes natural gas storage data every Thursday. When working gas in storage falls more than 10% below the 5-year average, it signals that supply is tighter than normal — a condition that supports elevated prices for weeks or months.

Gas-to-Power Risk in the Permian Basin

West Texas — Midland, Odessa, and the Permian Basin — faces a specific version of this risk. Waha Hub natural gas in West Texas has historically traded at a discount to Henry Hub due to pipeline takeaway constraints. But in periods of high demand or when export capacity is constrained, Waha can trade at parity or premium — directly affecting power generation costs in ERCOT's western load zone.

Operations in Midland and Odessa exposed to real-time ERCOT pricing should monitor both Henry Hub and Waha basis alongside LZ_WEST settlement prices.

The Combined Risk Scenario

The highest-risk condition for Texas energy costs is the intersection of: extended heat above 100°F, elevated Henry Hub above $4/MMBtu, below-average EIA storage, and compressed ERCOT reserve margins below 8GW.

This quadruple pressure scenario has historically corresponded with ERCOT prices above $200/MWh in the Houston Hub. It is the scenario that energy procurement teams prepare for — and operations directors need early warning about.