New York ISO

• A - West Zone
• B -Genessee Zone
• C -Central Zone
• D -North Zone
• E -Mohawk Valley Zone
• F -Capital Zone
• G -Hudson Valley Zone
• H -Millwood Zone
• I -Dunwoodie Zone
• J -New York City Zone
• K -Long Island Zone

• HyQ - Hydro Quebec Interface
• IMO - Ontario Interface
• NPX - ISO New England Interface
• PJM - PJM Interconnection Interface

ISO New England

• CT - Connecticut Zone
• RI - Rhode Island Zone
• MAH - Internal Hub
• WCMA - West Central Massachusetts Zone
• SEMA - Southeast Massachusetts Zone
• NEMA - Northeast Massachusetts Zone
• WCMA - West Central Massachusetts Zone
• VT - Vermont Zone
• NH - New Hampshire Zone
• ME - Maine Zone

• NB - New Brunswick Interface
• NYROSETON - Roseton Interface
• NYSHOREHAM -Shoreham Interface
• QHIGATE - Quebec Highgate Interface
• QP1P2 - Quebec Phase I Phase II Interface

Midwest ISO

• CIN - Cinergy Hub
• IL - Illinois Hub
• MEC - MidAmerican (Des Moines, Iowa)
• MI - Michigan Hub
• MN - Minnesota Hub
• WAUE - WAPA Interface
• WUMS - Wisconsin/Upper Michigan (WPS.WESTON3)

PJM Interconnection

• AEPD - AEP Dayton Hub
• EH - Eastern Hub
• NIL - Northern Illinois Hub
• NJ - New Jersey Hub
• PSEGZ - PSEG Zone
• WH - Western Hub

ERCOT

• ERN - North
• ERH - Houston