About the data
Clearing prices and cleared MW by zone and product from PJM RPM, MISO PRA, NYISO ICAP and ISO-NE FCM, in each ISO’s native unit and converted to $/MW-day. Each record keeps its source document.
Some early MISO decks are no longer on MISO’s site and come from copies filed with the Missouri Public Service Commission. CAISO, ERCOT and SPP run no capacity auction.
- Served
- PJM from the 2007/08 delivery year, MISO from 2013/14, NYISO from summer 2006, ISO-NE from 2010/11
- Markets
- PJM, MISO, NYISO and ISO-NE
- Units
- Each ISO’s native unit, and $/MW-day
- Updates
- Monthly, and within days of a new auction
- Licence
- Public market information under each ISO’s terms of use
Coverage by market
| Market | First year served |
|---|---|
| CAISO | — |
| ERCOT | — |
| ISO-NE | 2010 |
| MISO | 2013 |
| NYISO | 2006 |
| PJM | 2007 |
| SPP | — |
The newest day in each market, checked every hour, is on Coverage.
Access
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Where it appears: Capacity layer, plant panel, capacity dashboard.
MCP tools that return it: get_capacity_auctions. The MCP server is part of Pro; setup is on MCP server.
Sources
- PJM RPM(opens in a new tab), PJM
- MISO PRA(opens in a new tab), MISO
- NYISO ICAP, NYISO
- ISO-NE FCM(opens in a new tab), ISO-NE
Periods and update notes for each source are on Data sources.
Known gaps
- PJM cleared MW start with 2014/15. Earlier auctions have prices only.
- CAISO, ERCOT and SPP run no capacity auction.
Missing values stay missing: a null means the source has no usable record, never zero. Zero and negative values are shown as reported.
Questions it answers
- How did PJM RTO capacity prices change over the last five delivery years, in $/MW-day?
- What did each MISO zone clear at for summer 2025 in the Planning Resource Auction?
- How do ISO-NE FCM clearing prices compare with NYISO ICAP prices in $/MW-day?