| Decision point | Spot or indexed gas | Fixed gas |
|---|---|---|
| Specified commodity price | Follows defined reference | Fixed for stated period and quantity terms |
| Open questions | Index, basis, daily/monthly timing | Included services and usage tolerance |
| Budget scenario | Test higher prices and usage together | Test exclusions and changed consumption |
| Data needed | Monthly/daily quantity and settlement terms | Load forecast and executed fixed scope |
Separate commodity from local delivery and basis
Identify the index location and timing, then determine whether the proposal includes a location differential, transportation, balancing, capacity or other services. A monthly index and a daily swing quantity are different exposures. Ask how consumption beyond the contracted amount is priced and who handles nomination requirements, where applicable.
Natural gas volume and energy units also need normalization. A price per Mcf cannot be compared directly with dollars per therm without the relevant heat-content factor. Keep both proposals in the same unit and scope. The utility’s distribution charges may remain regardless of the chosen supplier arrangement.
Consider seasonal operating exposure
Heating-heavy businesses can need the most gas during periods when weather or infrastructure stress also affects prices. A steady process user has a different load shape. Review monthly history and operational needs instead of using one annual average to imply that winter and summer exposure are interchangeable.
Fixing a commodity portion can support planning for that portion, but forecasts can still be wrong. Inspect tolerance, excess use and unused-volume terms. Retaining indexed exposure can allow prices to follow the specified market in both directions, while requiring budget capacity for adverse moves. Neither approach is a reliable way to guarantee the lowest hindsight price.
Hypothetical cold-month scenario
Assume 20,000 therms in a delivery month. At an invented fixed commodity price of $0.60, cost is $12,000. An indexed commodity case at $0.45 gives $9,000, while a stress case at $0.90 gives $18,000. These examples do not assign probabilities and exclude all noncommodity charges.
If usage rises to 25,000 therms, the contract determines how the additional quantity is treated. It may not simply receive the same fixed price. Ask for a written example of the higher-volume settlement under both proposals before calling the fixed option a complete budget cap or the indexed case flexible without qualification.
Document the chosen risk limits
Record the quantity covered, delivery months, price formula and open portions. For a mixed strategy, calculate fixed and open volume month by month rather than relying only on an annual hedge ratio. Define who reviews the position when operations or the forecast changes.
EIA identifies supply, demand, weather, storage and infrastructure as gas price influences; those concepts explain uncertainty, not a forecast for the next renewal. Use multiple stated scenarios and actual supplier documents. A purchasing decision should describe what the business can absorb and manage, with no claim here that spot or fixed gas is universally cheaper.
Questions & answers
Does fixed gas protect all excess usage?
Only if the agreement says so. Excess volume and balancing can have separate prices or obligations.
Sources & scope
Primary references reviewed October 15, 2026. These sources support the stated concepts; actual tariffs, program rules and signed agreements govern the account. Decision examples and operational worksheets are original educational analysis.
- EIA: Factors affecting natural gas prices
Gas supply, demand, weather, storage and infrastructure as price drivers. - DOE FEMP: Evaluating Your Utility Rate Options
Energy, demand and fixed charges and why the complete tariff matters.