correction pdci coi derate correction day ahead market ran coi branch group ttc north south direction changed 4150 mw 4100 mw 20 4300 mw 4100 mws 21 22 pdci north south direction 2721 mw 2572 mw 20 2721 mw 2572 21 22 operating day 09 12 01 reason change extended 500 kv line work first applicable hour ahead market run values 20 iso update changes line rating status sent market operations inquiries please call hour ahead desk