Read the delivery year, not just the release date
An auction occurs on one date and concerns a specified future delivery period. Schedules, market rules, and parameters can change, so avoid assuming every auction always follows an unchanged three-year calendar. PJM’s RPM resource page publishes delivery-year materials and related documents. Record which auction and period a figure describes. A result for one delivery year is not automatically the charge applying to this month’s utility bill or every year in a supplier agreement.
Location and obligation shape the impact
Capacity prices and constraints can differ by relevant area, while the account’s obligation depends on applicable allocation rules. MW-day pricing must be combined with the assigned MW quantity and period before it becomes dollars. Scaling and other factors may apply. Do not use total annual energy as a substitute for the capacity tag. Ask the supplier to show the exact customer quantity, data source, delivery period, and method behind a forecast or pass-through charge.
The contract determines timing and exposure
A defined capacity component may be fixed, passed through, or subject to a particular adjustment clause. The supplier’s effective charge can therefore differ from a simple before-and-after auction comparison. A renewal quote may reflect several changes at once, including energy, capacity, transmission, credit, or load. Separate those effects. If peak management is being considered, verify the measurement year, relevant intervals, and contractual ability to receive a lower obligation rather than promise immediate savings.
Hypothetical auction-to-budget bridge
Suppose an invented price difference is $100/MW-day and a simplified unchanged obligation is 0.1 MW. Over 365 days the unadjusted difference would be $3,650. That is only a teaching calculation: actual delivery-year days, locational treatment, scaling, and contract allocation can change the result. A headline percentage cannot replace this bridge. Request the supplier’s account-specific explanation and compare it with current PJM documents before approving a budget change or repeating a claimed retail impact.
Practical review checklist
- Record auction identity, delivery year, location, units, and the date of the primary document.
- Verify the account obligation and all scaling or allocation assumptions with the supplier or utility data.
- Read capacity inclusion, pass-through, and change provisions in the executed agreement.
- Separate auction effects from energy, network, load, and other changes in a renewal or bill.
Questions & answers
Does this guide report the latest clearing price?
No. It explains interpretation without embedding a time-sensitive auction number. Consult PJM’s current delivery-year documents for live results.
Can I multiply a percentage auction increase by my total bill?
No. The invoice contains other components and the capacity allocation is account- and contract-specific.
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.
- PJM: Capacity Market (RPM)
Capacity auctions, delivery periods, and primary market documents. - FERC: Wholesale electricity markets overview
Wholesale energy, capacity, and ancillary-service functions. - DOE FEMP: Evaluating your utility rate options
Demand, ratchets, time-of-use rates, coincident peaks, and standby charges.