Platts launches US PPA price assessments for long-term solar contracts in MISO, SPP power hubs

Platts, part of S&P Global Energy, has launched daily Power Purchase Agreement (PPA) price assessments for long-term solar contracts in the Midcontinent Independent System Operator (MISO) and the Southwest Power Pool (SPP), effective Aug. 24, 2026.

Platts first proposed to launch these assessments on July 10 in the note available here, and announced its decision to launch on July 27 in a note available here.

These assessments focus on PPA prices for physical and virtual long-term contracts for electric power generated from solar projects across three hubs in MISO and two hubs in SPP. Platts defines long-term as PPAs for a tenure of 120 months or longer. On Jan. 1, the long-term contracts will roll forward to the following year. For example, on Jan. 1, 2027, Platts will begin assessing tenors from January 2028.

The published values reflect virtual PPAs, financially settled, as the basis. Platts normalizes all PPA data to this standard for assessment purposes.

The new assessments are as follows:

These price assessments reflect PPA projects for solar technology with an electricity generation capacity of at least 75 megawatts and contracted on an as-generated basis with a timestamp of 1330 CT. These assessments are published in US dollars/mega-watt hour and follow the US holiday calendar.

The long-term solar assessments are assessed as bundled products, reflecting energy and Renewable Energy Certificates (RECs) together.

Platts considers bids, offers, trades, and indicative values for PPAs using these specifications.

Platts will also publish monthly averages for the assessments listed above. The daily assessments are found on the alert page CLE0002, and the monthly averages are available on CLE0007, and in the Platts North American PPAs report.

Please send any questions or comments to powerpricing@spglobal.com and pricegroup@spglobal.com.

For written comments, please provide a clear indication if comments are not intended for publication by Platts for public viewing. Platts will consider all comments received and will make comments not marked as confidential available upon request.