Platts to exclude Top of Diamond trades from Transco, Leidy Line receipts natural gas index at the end of December

Platts, part of S&P Global Energy, will exclude Top of Diamond trades from the daily and monthly Transco, Leidy Line receipts index at the end of December.

Top of Diamond daily gas trades starting on trade date Dec. 31, and January 2026 bidweek trades on trade dates Dec. 23, 24, and 29 will be excluded from the Transco, Leidy Line receipts index.

Platts has observed a large price divergence between trades west of Station 517 and Top of Diamond at the Chapin, Puddlefield and Carverton receipt points. Platts received a significant amount of feedback during the consultation period that supports the exclusion of Top of Diamond trades from the index as soon as possible. A link to the consultation note can be found here.

The revised methodology for the Transco, Leidy Line receipts daily and monthly index will be as follows:

Receipts into Transcontinental Gas Pipe Line's Leidy Line downstream of the Leidy and Wharton storage facilities in Clinton and Potter counties, PA, to Transco's station 505 in Hunterdon County, NJ. Top of Diamond trades and trades at the storage-related interconnects with Eastern Gas Transmission and Storage, National Fuel Gas Supply, UGI Storage Company or Tennessee Gas Pipeline are not included.

Platts will continue to publish the ICE Leidy (Top of Diamond) index under daily trade date symbol JAAZZ00 and monthly symbol JAAZZ03. Platts will consider adding a Platts Transco, Leidy Top of Diamond index at a later date.

Please send any comments or questions to AmericasGasPricing@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.