PSAST TCRM Script Structure PSAST Meeting May 20, 2008 Kurt Conger Seattle City Light

Y N Y N Set Up Basecases Summer/Winter Base Cases Project Topology (PT) Loop  Insert PTs PT Case Operating Conditions, Transfer Direction Loop Winter/Summer HLH/LLH S-N/N-S Next PT TCRM Table Nomogram Spreadsheets Next OC/TD OTC Limit Calculations Primary Contingencies Generator Scenarios Temperature (Load) Y More OC/TDs? N Restore PT Case Y More PTs? Restore Basecases N Done!

Results Table Project Topology [key], Season (Summer or Winter) [key], Load Period (HLH or LLH) [key], Transfer Direction (N-S or S-N) [key], Primary Contingency (Outage Scenario) [key], Generation Scenario (ATC) [key], Temperature Scenario (ATC) [key], Transfer Limit (MW) [result], Worst (Secondary) Contingency [result], Limiting Facility (Element) [result], Other results fields [results] %OTDF Pre-Trans Est Limit Used Other ATC Mon values Solution Code Color [result].