text_combined: coi north south rerate day ahead market ran coi branch group ttc n direction changed 3800 mw 4100 mw 1800 2400 operating day 7 26 01 reason change northwest generation urgent pump repairs first applicable hour ahead market run values 1800 iso update changes line rating status sent market operations inquiries please call hour ahead desk system conditions described communication dynamic subject change iso attempted reflect current accurate information available preparing notice system conditions may change suddenly little notice