pdci iso share nob south north derate day ahead market ran pdci tnob branch group n direction changed 2084 mw 1904 mw iso share pnob changed 1407 mw 1285 mw 1700 2400 operating day 7 26 01 reason change northwest generation urgent pump repairs first applicable hour ahead market run values 1700 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