TEP RMR Workshop Presentation1 Workshop on ACC RMR study submitted with 2004 ten year plan Tucson Electric Power January 15, 2004 Ed Beck Supervisor Transmission Planning

TEP RMR Workshop Presentation2 TEP RMR Study TEP operates its system to WECC / NERC Level C (N-2) criteria Studies for RMR analysis were done to WECC / NERC Level B (N-1) based on Biennial assessment Cases used in study developed jointly with APS, SRP, WAPA, SWTC

TEP RMR Workshop Presentation3 TEP System TEP system historically has been voltage stability constrained –Local Var responsive units can be committed in TEP load area to supply var support and lower imports as necessary –Automated remedial action scheme that responds to selected single and double contingencies within maximum 0.7 seconds In future years we have identified thermal and internal voltage SIL constraints

TEP RMR Workshop Presentation4 UES System This report does not address issues with the UES Santa Cruz County area TEP is extensively studying issues in Santa Cruz county as part of a separate study for the Commission

TEP RMR Workshop Presentation5 Greenlee Westwing North Loop South TEP Service Area Vail 500 kV 345 kV Irvington Voltage 2005 New Facilities Nogales Tortolita Saguaro Winchester (04) Copper Verde (04) Gateway Sub (05) Internal 138 kV upgrades

TEP RMR Workshop Presentation6 Greenlee Westwing North Loop South TEP Service Area Vail 500 kV 345 kV Irvington Voltage 2008 New Facilities Nogales Tortolita Saguaro Pinal West Internal 138 kV upgrades

TEP RMR Workshop Presentation7 Greenlee Westwing North Loop South TEP Service Area Vail 500 kV 345 kV Irvington Voltage 2012 New Facilities Nogales Tortolita Saguaro Pinal West to Tortolita Nogales Tortolita to South

TEP RMR Workshop Presentation8 Simultaneous Import Limit YearSIL MW Losses Total MW Critical Outage Nature of Constraint Cholla – Sag. 500 kV line WECC volt. Stability criteria South T2 345/138kV xfmr Irv/VL 138 kV line limit SPR-VL 345kV lineInternal volt. Criteria

TEP RMR Workshop Presentation9 Peak Load YearPEAK MW Losses Total MW RMR MW Critical OutageNature of Constraint South T2 345 / 138 kV Xfmr Irvington / Vail 138kV line loading limit South T2 345 / 138 kV Xfmr Irvington / Vail 138kV line loading limit Tortolita 500/138 Xfmr (#1 or #2) Remaining Tortolita 500/138 kV Xfmr loading limit

TEP RMR Workshop Presentation10 MLSC YearPEAK MW Losses Total MW Gen. Critical OutageNature of Constraint South T2 345 / 138 kV Xfmr Irvington / Vail 138kV line loading limit South T2 345 / 138 kV Xfmr Irvington / Vail 138kV line loading limit Tortolita 500/138 Xfmr (#1 or #2) Remaining Tortolita 500/138 kV Xfmr loading limit

TEP RMR Workshop Presentation11 Summary – Cost RMR Inc. RMR gen. costs SIL MLSC Peak Load RMR Annual Cost$68,061$307,179$301,885

TEP RMR Workshop Presentation12 Environmental RMR Output SO2NOxPMCO , ,2211,5085, ,

TEP RMR Workshop Presentation13 Questions?