Commercial energy / Buyer guidance
NYMEX gas quotations and a business electricity decision
Distinguish gas futures from electricity products, align delivery months and avoid mistaking an indicative screen price for an executable business offer.
Identify the instrument before interpreting the chart
The phrase “NYMEX electricity price” is too imprecise to support a procurement decision. A chart may actually show Henry Hub natural gas futures. An exchange, symbol, contract month, location and unit identify a product; the exchange name alone does not. Request those fields whenever a market update is used to justify an electric contract recommendation.
CME's Henry Hub specification concerns a natural gas futures contract. Electricity products have their own locations, delivery periods and specifications. The old electricity wording in this page's URL is retained for continuity; the buying question is how to verify the actual instrument and its relevance to a power offer.
Match the delivery strip to the purchase
A front-month gas quotation does not describe a twelve-month electricity contract beginning six months later. Record the months covered by the customer's proposed supply term and the consumption expected in each month. A simple average of market prices weights every month equally; an account forecast may not. Seasonal businesses should ask how a supplier incorporated their load shape rather than assume that a familiar benchmark is the entire price.
Keep screen observations separate from executable offers. A market data timestamp, a supplier's indicative rate and a signed price confirmation are different records. Credit approval, quote expiration, usage assumptions and the named account can affect whether a rate is actually available.
Worked example: why a flat average can mislead
Independently constructed illustration: suppose a wholesale power scenario has two periods priced at $50/MWh and $90/MWh. A simple average is $70/MWh. A facility expects 100 MWh in the first period and 300 MWh in the second. Its weighted scenario cost is 100 × $50 + 300 × $90 = $32,000 for 400 MWh, or $80/MWh.
Using the simple average would produce $28,000, understating that scenario by $4,000. These are invented teaching prices, not current exchange quotations. The example excludes retail adders and does not derive a power price from gas futures. Its purpose is to show why the purchased period and volume weights must be specified before comparing a market chart with a supplier offer.
A quotation verification record
| Field | Evidence to retain |
|---|---|
| Instrument | Full product name, symbol and specification |
| Delivery | Months, hours, region and settlement basis |
| Observation | Timestamp, source and whether the price is executable |
| Customer fit | Commodity, actual account, term and expected usage |
| Retail bridge | Included costs, fees, exclusions and contract risk |
Ask the supplier to explain each bridge rather than supplying your own assumption about a generic percentage markup. Use the offer comparator only after rates have been put on compatible units and inclusions. It models entered flat rates and monthly fees; it does not price futures, hedge positions or an hourly indexed contract.
Sources and limits
CME Henry Hub futures is the primary product reference. EIA energy units supports unit checks. The weighted-price illustration is original arithmetic and is not a prediction or trading recommendation.