Indexed energy pricing: the formula behind the offer

Identify the reference precisely

An electricity index can reference a day-ahead or real-time price at a particular hub, node, or zone. Gas can reference a published monthly or daily market assessment at a named location. Write down the publication, unit, calendar, and fallback method if the reference is unavailable. A quote that simply says market plus a fee is incomplete. Two offers using different points or settlement calendars are not comparable until their resulting cost exposure is normalized.

Your load determines the weighted price

For interval-priced electricity, each interval’s quantity is multiplied by the applicable price and the resulting costs are added. The simple average of market prices can differ materially from the business’s usage-weighted average. Loss adjustments and other settlement factors can increase purchased quantities above metered consumption. Gas arrangements may also include basis and balancing. Request an invoice example using your own usage shape so the accounting team can reconstruct the calculation rather than accept an unexplained blended rate.

Plan for exposure and administration

An index moves the specified market component rather than every item on the bill. Capacity, delivery, ancillary services, credit requirements, and supplier fees can have separate treatment. Establish who monitors prices, reviews invoices, and has authority to hedge or change the product where permitted. An indexed agreement does not imply an unrestricted right to convert at any time. Read conversion options, notice requirements, and applicable fees before assuming the business can escape a volatile period.

Hypothetical two-hour calculation

A facility uses 1 MWh at a hypothetical $40/MWh index and 3 MWh at $100/MWh. Its energy cost is $40 + $300 = $340, or $85/MWh over 4 MWh. The simple price average is only $70/MWh and understates the load-weighted cost. An additional $5/MWh supplier adder would bring the modeled subtotal to $360. This example excludes losses and other services. It demonstrates why the consumption profile matters as much as the published market average.

Practical review checklist

• Record index publisher, delivery point, settlement period, units, and unavailable-index fallback.
• Reconstruct the load-weighted calculation using actual or representative interval data.
• Identify losses, basis, balancing, capacity, ancillary costs, fees, and any separate credit exposure.
• Assign monitoring and invoice-review responsibility and document any permitted conversion or hedge process.

Questions & answers