SUBSCRIBER NOTE: Platts to update North American marginal heat rates

S&P Global Platts will update the power and natural gas hub pairings used to calculate day-ahead North American marginal heat rates.

In the case of day-ahead marginal heat rates, each power hub will be paired with one to two corresponding regional gas hubs. On most days, the gas hub in the first position will be used to calculate the marginal heat rate. If on a given day, prices are unavailable for the first position gas hub -- due to an issue such as liquidity -- Platts will use the gas hub in the second position to calculate the marginal heat rate.

The list below outlines the power hub to gas hub pairings. Platts will implement these changes May 8. Please send any comments or questions to electricity_platts@spglobal.com and pricemethodology@spglobal.com.

Power Hub Gas Hub 1 Gas Hub 2 Alberta TC Alb AECO-C CAISO NP15 PG&E CG CAISO SP15 SoCal Gas PG&E South CAISO ZP26 SoCal Gas PG&E South CA-OR Border PG&E Malin ERCOT AEN Waha Transwestn Perm ERCOT Bus Average Waha Transwestn Perm ERCOT CPS Zone Tenn Zn0 FDt Tx. Eastern, STX ERCOT Houston Hub Houston ShipChl Katy ERCOT Houston Zone Houston ShipChl Katy ERCOT Hub Average Waha Transwestn Perm ERCOT LCRA Zone Tenn Zn0 FDt Tx. Eastern, STX ERCOT North Hub NGPL Texok Zn Tx. Eastern, ETX ERCOT North Zone NGPL Texok Zn Tx. Eastern, ETX ERCOT Rayburn Zone Carthage Hub Tx. Eastern, ETX ERCOT South Hub Tenn Zn0 FDt Agua Dulce Hub ERCOT South Zone Tenn Zn0 FDt Agua Dulce Hub ERCOT West Hub Waha Transwestn Perm ERCOT West Zone Waha Transwestn Perm Florida FL Gas Zn3 Four Corners El Paso SanJuan Into GTC Transco Zn4 Into Southern Transco Zn4 Into TVA Texas Gas Zn1 ISONE Connecticut Zone Iroquois Zn2 Tenn Zn6 Dlvd ISONE Internal Hub Algonquin CG Tenn Zn6 Dlvd ISONE Maine Zone Algonquin CG Iroquois Recpts ISONE NE Mass-Boston Zone Algonquin CG Iroquois Recpts ISONE New Hampshire Zone Algonquin CG Iroquois Recpts ISONE Rhode Island Zone Algonquin CG Tenn Zn6 Dlvd ISONE SE Mass Zone Algonquin CG Tenn Zn6 Dlvd ISONE Vermont Zone Algonquin CG Iroquois Recpts ISONE West-Central Mass Zone Algonquin CG Tenn Zn6 Dlvd John Day NW Can Bd Sumas Mead SoCal Gas CG Mid-Col NW Can Bd Sumas MISO Arkansas Hub Enable Gas Transmission Trunkline Zn 1A MISO Illinios Hub Chicago CG Alliance Interstates MISO Indiana Hub Chicago CG Lebanon Hub-Ohio MISO Louisiana Hub Col Gulf LA Tx. Eastern, WLA MISO Michigan Hub Mich Con CG Cons Energy CG MISO Minnesota Hub Nrthrn Ventura Emerson Viking MISO Texas Hub NGPL Texok Zn Mona Utah Kern Rvr Opal NOB NW Can Bd Sumas NYISO Capital Zone Transco Zn6 NY Millennium East receipts NYISO Central Zone Niagara Dominion S Pt NYISO Dunwood Zone Iroquois Zn2 Transco Zn6 NY NYISO Genese Zone Niagara Dominion S Pt NYISO Hudson Valley Zone Iroquois Zn2 Transco Zn6 NY NYISO Long Island Zone Transco Zn6 NY Iroquois Zn2 NYISO Millwood Zone Iroquois Zn2 Transco Zn6 NY NYISO Mohawk Valley Zone Transco Zn6 NY Millennium East receipts NYISO North Zone Iroquois Recpts NYISO NYC Zone Transco Zn6 NY Iroquois Zn2 NYISO West Zone Niagara Dominion S Pt Ontario Dawn Ontario Mich Con CG Palo Verde SoCal Gas CG Pinnacle SoCal Gas CG PJM AEP Gen Hub PJM AEP Zone Dominion S Pt Tx. Eastern zone M-2 receipts PJM AEP-Dayton Hub Mich Con CG PJM Allegheny Power Zone Col Gas Appal Dominion S Pt PJM Atlantic Electric Zone Transco Zn6 non-NY Tx. Eastern M-3 PJM ATSI Gen Hub Dominion S Pt Col Gas Appal PJM ATSI Zone Dominion S Pt Col Gas Appal PJM BG&E Zone Tx. Eastern M-3 Dominion S Pt PJM Chicago Gen Hub Chicago CG PJM Chicao Hub Chicago CG PJM ComEd Zone Chicago CG PJM Dayton P&Lt Zone Tx. Eastern M-3 Lebanon Hub-Ohio PJM Delmarva P&L Zone Transco Zn6 non-NY Tx. Eastern M-3 PJM Dominion Hub Transco Zn5 Dlv Col Gas Appal PJM Dominion Zone Transco Zn5 Dlv Col Gas Appal PJM Duke Zone Dominion S Pt Tx. Eastern zone M-2 receipts PJM Duquesne Light Zone Dominion S Pt Col Gas Appal PJM Eastern Hub Tx. Eastern M-3 Transco Zn6 non-NY PJM EKPC Zone Tx. Eastern zone M-2 receipts Lebanon Hub-Ohio PJM JCPL Zone Transco Zn6 non-NY Transco Leidy Line receipts PJM MetEd Zone Tx. Eastern M-3 Transco Zn6 non-NY PJM New Jersey Hub Tx. Eastern M-3 Transco Zn6 non-NY PJM Northern Illinios Hub Chicago CG PJM Ohio Hub Dominion S Tx. Eastern zone M-2 receipts PJM PECO Zone Tx. Eastern M-3 Transco Zn6 non-N.Y PJM Pennsylvania Electric Zone Transco Leidy Line receipts Dominion S Pt PJM PEPCO Zone Transco Zn5 Dlv Dominion S Pt PJM PPL Zone Transco Leidy Line receipts Transco Zn6 non-NY PJM PSEG Zone Tx. Eastern M-3 Transco Zn6 non-NY PJM Rockland Electric Zone Transco Zn6 non-NY Tx. Eastern M-3 PJM West Interface Hub Col Gas Appal Tx. Eastern zone M-2 receipts PJM Western Hub Tx. Eastern M-3 Dominion S Pt SPP North Hub Nrthrn Ventura Northern Demarc SPP South Hub Panhandle TX-OK Oneok OK VACAR Transco Zn5 Dlv Westwing SoCal Gas CG