Commercial energy / Buyer guidance
Electricity pass-through charges: reconcile the rate with the invoice
Build an electricity cost inclusion matrix and test an apparently cheaper offer against separately billed components.
Turn fixed into a list of included components
When an electricity offer says fixed, ask what that word modifies. A fixed energy component is not the same comparison as a rate incorporating additional supply components. Put each offer's treatment of energy, capacity, transmission, losses, ancillary services, administration and utility delivery into an inclusion matrix. Use included, separately priced, variable formula, or unresolved; do not turn an unresolved field into a zero.
Constellation's business FAQ identifies multiple electricity cost components. Its list does not establish how a particular offer allocates them. The matrix here is an independent document-review method, not a claim that all suppliers bill each component separately.
Trace a charge from authority to allocation
For each proposed pass-through, ask for the named cost, governing source, effective period, customer allocation method and any markup. Determine whether it is already included elsewhere. A reference to a wholesale market charge does not alone show how the supplier may charge this account. Record the contract provision authorizing it alongside the external calculation source.
Keep changes in billed quantity separate from changes in unit cost. Some adjustments may use usage, a separately determined obligation or a different allocation basis. Do not multiply a published market price by a monthly demand reading unless the applicable method actually calls for that. Ask for one sample invoice using the business's forecast quantities and another showing the effect of a specified input changing.
Worked example: the lower headline rate is not the lower modeled total
Invented one-month offers: usage is 100,000 kWh. Offer A charges $0.080/kWh plus separately stated supply components of $0.012/kWh and a $50 monthly fee. Offer B includes those same components at $0.094/kWh with no monthly fee. Both examples exclude the same utility delivery charges and taxes.
Offer A is 100,000 × ($0.080 + $0.012) + $50 = $9,250. Offer B is 100,000 × $0.094 = $9,400. A is $150 lower under these assumptions. If A's variable component becomes $0.016/kWh, A becomes $9,650, now $250 higher than B. Neither outcome is a forecast.
The component at which the two modeled amounts match is $0.0135/kWh: $0.094 − $0.080 − ($50 ÷ 100,000). That threshold describes this month's hypothetical usage only. At a different quantity, the fixed fee has a different per-kWh effect. It does not account for differences in credit, termination or volume provisions.
Distinguish a named pass-through from an amendment right
Read separate language covering changes in law, regulatory charges, product changes and other price adjustments. Ask what notice and evidence accompany an adjustment and what dispute process applies. Do not assume that a list of currently passed-through items is an exhaustive list of circumstances under which pricing can change.
During invoice review, reconcile each line against the inclusion matrix before comparing total bills. The offer comparator is useful for entered flat rates and fees; variable components require a separate scenario and documentation.
Sources and limits
The linked supplier explanation supports the component distinction, not the example rates or any right to impose a charge. These are hypothetical supply calculations, not a current quote, a regulatory interpretation or an achieved saving.