Natural gas indexes are the foundation of every supply contract and hedging program in Mexico. Understanding which index applies to a given consumption point, how it moves, and what its behavior implies for cost planning is a prerequisite for any serious hedging discussion. This post covers the main indexes relevant for Mexican buyers. For the broader framework of how these indexes connect to actual hedging decisions, the natural gas hedging guide for Mexico offers the strategic overview.
Natural gas has become one of the most relevant energy sources for the industrial sector in Mexico. However, its price is neither unique nor fixed: it depends on regional indices that are constantly updated and used as a basis for supply contracts or financial hedging. Understanding which index is being used, how it behaves, and what risks it presents is essential for any company with exposure to natural gas.
What are natural gas indexes?
A natural gas index reflects the weighted average price of physical transactions at a specific geographic location, also known as a hub. It is a reference published daily or monthly by agencies such as Natural Gas Intelligence (NGI) or Platts, and it standardizes the conditions for buying and selling gas among producers, transporters, and consumers.
These indices are not fixed prices. They are based on actual transactions and can vary widely depending on location, local supply, seasonal demand, pipeline capacity, and technical or weather-related factors.
Main natural gas indexes used in Mexico
Natural gas imported into Mexico from the United States is distributed through various entry points along the northern border. Each of these points is linked to a specific index that serves as the basis for supply contracts or financial hedging.
The following image clearly shows the regions of the country where three of the most common indices dominate:
Geographic location, pipeline infrastructure, and proximity to hubs determine which index is used in each region. This analysis is key to defining more efficient hedging strategies.
How the final price is structured
In supply contracts, gas prices are usually indexed to one of these hubs, adding a differential or “basis” that reflects transportation costs and specific risks of the supplier. For example, a company might have a contract priced at HSC + 0.30 USD/MMBtu, meaning they will pay the published average price of the Houston Ship Channel index plus a fixed negotiated charge.
This means that even if the base index is known, the differential also has a direct impact on the final price paid by the end user.
Volatility is a not always visible risk
Most regional indices behave differently throughout the year. Factors such as heating demand in winter, pipeline restrictions, or extreme weather events can generate temporary or prolonged distortions.
For example:
- The Waha index has recorded negative prices during pipeline congestion events.
- The differential between HSC and Henry Hub can widen by as much as 1.00 USD/MMBtu during high-demand periods.
- SoCal Border tends to show high variability in winter due to its proximity to the California market. During extreme events like the February 2021 Texas winter storm, these differentials can move far beyond normal ranges, as the CFE Goldman Sachs case demonstrated in detail.
This volatility is a direct risk to energy budgets if not managed properly.
Hedging to mitigate market movements
Companies exposed to natural gas prices have several tools to reduce price risk, mainly through financial hedging. The most common include:
- Swaps, futures, and options on Henry Hub, available with good liquidity for monthly, quarterly, or annual contracts.
- Swaps and options on HSC, Waha, or SoCal Border, depending on the financial counterparty and OTC market availability.
- Structured hedges on the base index plus the basis when there is exposure to both components.
- Exchange rate hedges, since gas prices are quoted in dollars but paid in pesos.
Which index is most convenient?
There is no “better” or “worse” index—only the one that best aligns with the geographic location of consumption, interconnection infrastructure, and real hedging possibilities.
Aspects to consider:
- Infrastructure: Where is the gas being imported from?
- Region: Is it near a hub with high liquidity?
- Seasonality: Does the index show sharp seasonal spikes?
- Liquidity: Are derivatives available for that index?
Understanding the index is part of the strategy
Choosing the right reference index for a contract or financial hedge can make the difference between maintaining stable operating margins or facing uncontrolled exposure to market volatility. Monitoring index behavior and understanding the tools available to manage it is a critical part of a sound energy strategy.