System Impact Study 2008 T1 Kelim Load at Airport Substation

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1 System Impact Study 2008 T1 Kelim Load at Airport Substation Studies Performed by: Joseph Liberatore August 2009 Rocky Mountain Region

2 Index Executive Summary...3 I. Introduction...4 II. Methodology...4 A. Monitored Paths...4 III. Base Case...5 IV. Criteria...5 A. System Intact...5 B. Contingencies...5 V. Results...6 A. Benchmark Case...6 VI. Cost Estimates...6 VII. Conclusion...6 Appendices...7 A. Single Line Diagrams Voltage Legend System intact with Project Airport Boyd 115 kv line contingency Airport Windsor 115 kv line contingency...10 B. Contingency Legend(full)...11 C. Monitored Buses...15 D. Monitored Elements

3 Executive Summary Interconnection queue position 2008-T1 requested network load service at Airport Substation. The study examines a network request that, for modeling purposes, was connected in simulation to Platte River Power Authority s (PRPA) Airport Substation which resides on the Western Area Power Administration (Western s) Boyd Windsor 115 kv Transmission Line. This request was originally incorporated in the Foothills Joint Queue study, but due to various issues, it was removed from that process and is being considered as a standalone request. A scheduled in service date of 2009 was originally requested, however due to timetables and equipment delivery, service is scheduled to commence in June Consequently, a Western Electricity Coordinating Council (WECC) 2010HS (Heavy Summer) base case was used and projected load from that year utilized in the analysis. A load of 5.8 MW (at 0.95 pf) was arrived at as outlined in the original service request under Network Load Service Agreement 07-RMR The 2010HS WECC base case was modified to include upgraded equipment and facilities reflecting best predicted system topology for summer Additionally, latest 2010 foothills area load predictions from Western, PRPA and Tri-State Generation and Transmission (TSG&T) were modified to most closely model system demands. WECC TOT3 (Path #36) and TOT7 (Path 40) were monitored during contingency analysis. For this study, TOT3 was not stressed to its 1680 MW limit; however, it was adjusted to reflect typical heavy summer operating conditions. Power flow analysis was performed on the WECC 2010HS base case with modified loads and topology updates. Under the system conditions described above, the additional load simulated at Kelim produced no system operating limit violations during System In-Tact (SI) and System Normal Minus One (N-1 or NERC category B) violations. 3

4 I. Introduction Interconnection queue position 2008-T1 requested transmission service at Airport Substation to serve new load and transfer existing load. The new delivery point will be named Kelim and physically located near the northwest corner of Colorado HWY 34 and CR3, immediately adjacent to the Airport Substation. An available position on the PRPA transformer at Airport Substation will be used until construction of new facilities are completed. That configuration and agreement are separate and outside the scope of this study. PSCo plans to sectionalize Western s Airport-Boyd 115 kv line and construct the Kelim Substation. An in service date during 2010 is expected and final energization will depend on construction schedules and materials availability. The study was performed from a 10 year load forecast provided in the original service request and is as follows: Year Summer kva Winter kva II. Methodology A. Monitored Paths For this study the proximity of two constrained paths, WECC Path 36 TOT3 (1680 MW) and Path 40 TOT7 (890 MW), exist and were monitored for overload violations. As has been the basis for stressing and/or determining the TOT3 limit, four generators in the area were set at pre-determined values as practiced in seasonal Operating Transfer Capability (OTC) studies. They are: Generator Net Output (MW) LRS 1100 CPP 66 Pawnee 777 DC Ties (Stegall and Sidney) 300 E-W 4

5 III. Base Case A. For purposes of this study, a WECC 2010 base case was used, as the requested in service date is Modifications to the base case include: Generation adjustment described above. Modified load forecasts from Tri-State, PRPA and WAPA. Conversations with XCEL confirmed load predictions contained within the WECC 2010HS2 were accurate and updates not required. Line and equipment ratings were compared to most current available and updated where applicable. Topologies at Owl Creek, Cheyenne, Foothills area and Eastern Colorado were updated to reflect their status during IV. Criteria A. System Intact Voltages will remain within the required 0.95 to 1.05 per unit range. Transmission lines and transformers may not exceed 100 % of their nominal rating. B. Contingencies Voltages will remain between 0.90 and 1.10 per unit. Transmission lines and transformers may not exceed either 100% of their nominal rating or an established emergency rating. Platte River Power Authority voltage criterion is 0.92 and 1.10 per unit. Additionally, all circuits in and around the Foothills region which share common structures were analyzed as a NERC category C (N-2) contingency. These are noted as a 2*xxxxx in the full contingency list included below. If applicable, tapped lines and associated loads were tripped in simulation to take in to account breaker-to-breaker, breaker-to-interrupter or interrupter-to-interrupter configurations. 5

6 V. Results A. For the Benchmark Case, TOT3 was stressed in simulation to 1400 MW. For system intact, no violations as described in section IV. Additionally, the stricter voltage criteria of 0.92 p.u. from PRPA was monitored and again, no system intact. No overloads were encountered during SI simulations. B. Under N-1 or Category B contingencies, two transformer overloads occurred. They are as follows: X--- MONITORED ELEMENT ----X X---LABEL--X W/O Kelim W/Kelim WELD PS WLD_WLD % 119.9% WELD PS T1 180MVA 180MVA TIMBERLN LAPO_DIXO 101.6% 101.8% TIMBERLN MVA 171MVA These transformers have a 30 minute overload rating of 20%. Mitigation would involve returning the contingency (LABEL column) to service and/or reduce area generation to alleviate overload. VI. Cost Estimates A. Modifications at Airport Substation required to accommodate Kelim load will be born solely by PSCo. They include a temporary service feed from an existing position on the PRPA transformer, until future sectionalization of the PRPA 115 kv bus structure is complete. At that time, substation alterations will occur on PRPA s equipment. Costs associated would be to verify network service complies with Western s standards as agreed upon mutually with PRPA and PSCo. VII. Conclusion The addition of Kelim load has no impact on the local system for the conditions described above. The modified load forecast numbers greatly reduced the amount of load in the foothills. Additionally, backing off of stressing TOT3 brings flows in the area down considerably. Plans to install switches and a breaker utilizing an extended section of bus will allow this interconnection to physically occur adjacent to the Airport Substation. 6

7 Appendices A. Single Line Diagrams 1. Voltage Legend

8 2. System intact with Project

9 3. Airport Boyd 115 kv line contingency. 9

10 4. Airport Windsor 115 kv line contingency. 10

11 B. Contingency Legend(full) BSH_B.C.R162:TRIP LINE FROM BUS [BRUSH SS ] TO BUS [B.CK PS ] CKT1 BSH_B.C.R187:TRIP LINE FROM BUS [BRUSH SS ] TO BUS [B.CK PS ] CKT2 GVAL_FTLU :TRIP LINE FROM BUS [GREENVAL ] TO BUS [FTLUPTON ] CKT1 GVAL_ST.V :TRIP LINE FROM BUS [GREENVAL ] TO BUS [ST.VRAIN ] CKT1 GVAL_KEEN :TRIP LINE FROM BUS [GREENVAL ] TO BUS [KEENSBG ] CKT1 COOR_FTLU :TRIP LINE FROM BUS [COORSREC ] TO BUS [FTLUPTON ] CKT1 DANI_PAWN :TRIP LINE FROM BUS [DANIELPK ] TO BUS [PAWNEE ] CKT1 FTLU_HUDSN :TRIP LINE FROM BUS [FTLUPTON ] TO BUS [HUDSON ] CKT1 FTLU_P.VAL :TRIP LINE FROM BUS [FTLUPTON ] TO BUS [P.VALLEY ] CKT1 FTLU_PWNEE :TRIP LINE FROM BUS [FTLUPTON ] TO BUS [PAWNEE ] CKT1 FTLU_ST.V :TRIP LINE FROM BUS [FTLUPTON ] TO BUS [ST.VRAIN ] CKT1 FTLU_ST.V :TRIP LINE FROM BUS [FTLUPTON ] TO BUS [ST.VRAIN ] CKT2 FTLU_JLGR :TRIP LINE FROM BUS [FTLUPTON ] TO BUS [JLGREEN ] CKT1 FTLU_HENR :TRIP LINE FROM BUS [FTLUPTON ] TO BUS [HENRYLAK ] CKT1 GILC_VASQ :TRIP LINE FROM BUS [GILCREST ] TO BUS [VASQUEZ ] CKT1 GREE_MONF :TRIP LINE FROM BUS [GREELEY ] TO BUS [MONFORT ] CKT1 GRLY_WELD :TRIP LINE FROM BUS [GREELEY ] TO BUS [WELD PS ] CKT1 2*JN_WLD_WIT:TRIP LINE FROM BUS [JOHNSTN ] TO BUS [WELD PS ] CKT1 TRIP LINE FROM BUS [WELD LM ] TO BUS [WHITNEY ] CKT1 LPRT-CEMPLNT:TRIP LINE FROM BUS [LAPORTPS ] TO BUS [LAPORTE ] CKT1 MONF_UNC :TRIP LINE FROM BUS [MONFORT ] TO BUS [UNC ] CKT1 PAWN_BRIC :TRIP LINE FROM BUS [PAWNEE ] TO BUS [BRICKCTR ] CKT1 PAWN_PTZL :TRIP LINE FROM BUS [PAWNEE ] TO BUS [PTZLOGN ] CKT1 PAWN_STOR :TRIP LINE FROM BUS [PAWNEE ] TO BUS [STORY ] CKT1 RIVE_HENR :TRIP LINE FROM BUS [RIVERDAL ] TO BUS [HENRYLAK ] CKT1 ROSE_UNC :TRIP LINE FROM BUS [ROSEDALE ] TO BUS [UNC ] CKT1 ROSE_ARRO :TRIP LINE FROM BUS [ROSEDALE ] TO BUS [ARROWHLK ] CKT1 B.CK_BEAV :TRIP LINE FROM BUS [B.CK PS ] TO BUS [BEAVERCK ] CKT1 B.CK_STOR :TRIP LINE FROM BUS [B.CK PS ] TO BUS [STORY ] CKT1 ST.V_WELD :TRIP LINE FROM BUS [ST.VRAIN ] TO BUS [WELD PS ] CKT1 ST.V_WIND :TRIP LINE FROM BUS [ST.VRAIN ] TO BUS [WINDSOR ] CKT1 WIND_AULT :TRIP LINE FROM BUS [WINDSOR ] TO BUS [AULT ] CKT1 ST.V_ISAB :TRIP LINE FROM BUS [ST.VRAIN ] TO BUS [ISABELLE ] CKT1 ST.V_SPND :TRIP LINE FROM BUS [ST.VRAIN ] TO BUS [SPNDLE ] CKT1 ST.V_LONG :TRIP LINE FROM BUS [ST.VRAIN ] TO BUS [LONGPEAK ] CKT1 ST.V_FORD :TRIP LINE FROM BUS [ST.VRAIN ] TO BUS [FORDHAM ] CKT1 2*WLD_ARR-KC:TRIP LINE FROM BUS [WELD PS ] TO BUS [ARROWHLK ] CKT1 TRIP LINE FROM BUS [KIOWA CK ] TO BUS [PROSPEC ] CKT1 TRIP LINE FROM BUS [PROSPEC ] TO BUS [KERSEYTP ] CKT1 TRIP LINE FROM BUS [KERSEYTP ] TO BUS [BOOMERNG ] CKT1 TTRIP LINE FROM BUS [BOOMERNG ] TO BUS [WELD LM ] CKT1 WLD_WLD115 :TRIP LINE FROM BUS [WELD PS ] TO BUS [WELD LM ] CKT1 BERT_LONE :TRIP LINE FROM BUS [BERTHOUD ] TO BUS [LONETREE ] CKT1 1*BERT_GATE :TRIP LINE FROM BUS [BERTHOUD ] TO BUS [GATEWYTS ] CKT1 2*BERT_GATE :TRIP LINE FROM BUS [BERTHOUD ] TO BUS [GATEWYTS ] CKT1 TRIP LINE FROM BUS [BERTHOUD ] TO BUS [LONETREE ] CKT1 RMEC_KEEN :TRIP LINE FROM BUS [RMEC ] TO BUS [KEENSBG ] CKT1 HENR_BROM :SET BUS [BROMLEY ] LOAD TO 0 MW OPEN LINE FROM BUS [BROMLEY ] TO BUS [HENRYLAK ] CKT1 KEEN_CEDA :TRIP LINE FROM BUS [KEENSBG ] TO BUS [CEDARCRK ] CKT1 AIRP_BOYD :TRIP LINE FROM BUS [AIRPORT ] TO BUS [BOYD ] CKT1 AIRP_WIND :TRIP LINE FROM BUS [AIRPORT ] TO BUS [WINDSORT ] CKT1 TRIP LINE FROM BUS [WINDSORT ] TO BUS [WHITNEY ] CKT1 AIRP_KELI :TRIP LINE FROM BUS [AIRPORT ] TO BUS [KELIM ] CKT1 AKRO_BEAV :TRIP LINE FROM BUS [AKRON ] TO BUS [BEAVERCK ] CKT1 ARCH.ALT :TRIP LINE FROM BUS [ARCHER ] TO BUS [AULT ] CKT1 AULT_CHEY :TRIP LINE FROM BUS [AULT ] TO BUS [CHEYENNE ] CKT1 2*AH.ALT.C_O:TRIP LINE FROM BUS [ARCHER ] TO BUS [AULT ] CKT1 TRIP LINE FROM BUS [CHEYENNE ] TO BUS [PONNEQUI ] CKT1 TRIP LINE FROM BUS [PONNEQUI ] TO BUS [OWL_CRK ] CKT1 AULT_RAWH :TRIP LINE FROM BUS [AULT ] TO BUS [RAWHIDE ] CKT1 AULT_TIMB :TRIP LINE FROM BUS [AULT ] TO BUS [TIMBERLN ] CKT1 WLD230_M.BUS:TRIP LINE FROM BUS [WELD PS ] TO BUS [WELD LM ] CKT1 TRIP LINE FROM BUS [WELD LM ] TO BUS [WELD LM ] CKT1

12 TRIP LINE FROM BUS [AULT ] TO BUS [WELD LM ] CKT1 TRIP LINE FROM BUS [AULT ] TO BUS [WELD LM ] CKT2 AULT_LAR. :TRIP LINE FROM BUS [AULT ] TO BUS [LAR.RIVR ] CKT1 DECREASE BUS [MBPP ] GENERATION BY 210 MW DECREASE BUS [MBPP ] GENERATION BY 210 MW AULT_CRAI :TRIP LINE FROM BUS [AULT ] TO BUS [CRAIG ] CKT1 BC115_TIE :TRIP LINE FROM BUS [B.CK TRI ] TO BUS [BEAVERCK ] CKT1 B.CK_STOR :TRIP LINE FROM BUS [B.CK TRI ] TO BUS [STORY ] CKT1 B.C.-BR_FM :TRIP LINE FROM BUS [BEAVERCK ] TO BUS [BRUSHTAP ] CKT1 TRIP LINE FROM BUS [BRUSHTAP ] TO BUS [EFMORGTP ] CKT1 TRIP LINE FROM BUS [EFMORGTP ] TO BUS [FMWEST ] CKT1 TTRIP LINE FROM BUS [EFMORGTP ] TO BUS [FMN ] CKT1 B.C._GRY_WDR:TRIP LINE FROM BUS [BEAVERCK ] TO BUS [GARY ] CKT1 TRIP LINE FROM BUS [GARY ] TO BUS [WOODROW ] CKT1 B.C._MSX_STL:TRIP LINE FROM BUS [BEAVERCK ] TO BUS [MESSEX ] CKT1 TRIP LINE FROM BUS [MESSEX ] TO BUS [STERLING ] CKT1 BC_ADNA_HYT :TRIP LINE FROM BUS [BEAVERCK ] TO BUS [ADENA ] CKT1 TRIP LINE FROM BUS [ADENA ] TO BUS [HOYT ] CKT1 2*AU_TMN_++ :TRIP LINE FROM BUS [AULT ] TO BUS [BLKHLWTP ] CKT1 TRIP LINE FROM BUS [BLKHLWTP ] TO BUS [COBBLKTP ] CKT1 TRIP LINE FROM BUS [COBBLKTP ] TO BUS [TIMNTHTP ] CKT1 TTRIP LINE FROM BUS [AULT ] TO BUS [WINDSOR ] CKT1 BOYD_LVLAND :TRIP LINE FROM BUS [BOYD ] TO BUS [LOVE E ] CKT1 BOYD_VALL :TRIP LINE FROM BUS [BOYD ] TO BUS [VALLEYLM ] CKT1 2*BYD_VL_DH :TRIP LINE FROM BUS [BOYD ] TO BUS [VALLEYLM ] CKT1 TRIP LINE FROM BUS [BOYD ] TO BUS [DERBHILT ] CKT1 BYD_BTHRD :TRIP LINE FROM BUS [BOYD ] TO BUS [GATEWYTS ] CKT1 TRIP LINE FROM BUS [GATEWYTS ] TO BUS [BERTHOUD ] CKT1 BOYD_DERB :TRIP LINE FROM BUS [BOYD ] TO BUS [DERBHILT ] CKT1 BOYD_PRTNER :TRIP LINE FROM BUS [BOYD ] TO BUS [PORTNER ] CKT1 PRTNER_HRMNY:TRIP LINE FROM BUS [HARMONY ] TO BUS [PORTNER ] CKT1 1*BOYD_LONG :TRIP LINE FROM BUS [BOYD ] TO BUS [LONGPEAK ] CKT1 T*BRIG_SAND :TRIP LINE FROM BUS [BRIGHTNW ] TO BUS [SANDCRK ] CKT1 TRIP LINE FROM BUS [SANDCRK ] TO BUS [HOYT ] CKT1 BRIG_ERIE :TRIP LINE FROM BUS [BRIGHTNW ] TO BUS [ERIE SW ] CKT1 BRUS_EFMO :TRIP LINE FROM BUS [BRUSHTAP ] TO BUS [EFMORGTP ] CKT1 1*CART_FLAT :TRIP LINE FROM BUS [CARTERLK ] TO BUS [FLATIRON ] CKT1 TRIP LINE FROM BUS [CARTERLK ] TO BUS [LOVEWTAP ] CKT1 TRIP LINE FROM BUS [LOVEWTAP ] TO BUS [VALLEYLM ] CKT1 TRIP LINE FROM BUS [LOVEWTAP ] TO BUS [LOVE W ] CKT1 1*CART_LOVE :TRIP LINE FROM BUS [CARTERLK ] TO BUS [LOVEWTAP ] CKT1 TRIP LINE FROM BUS [CARTERLK ] TO BUS [FLATIRON ] CKT1 TRIP LINE FROM BUS [LOVEWTAP ] TO BUS [VALLEYLM ] CKT1 TRIP LINE FROM BUS [LOVEWTAP ] TO BUS [LOVE W ] CKT1 CHEY_PONN :TRIP LINE FROM BUS [CHEYENNE ] TO BUS [PONNEQUI ] CKT1 TRIP LINE FROM BUS [PONNEQUI ] TO BUS [OWL_CRK ] CKT1 1*COBB_TIMN :TRIP LINE FROM BUS [COBBLKTP ] TO BUS [TIMNTHTP ] CKT1 TRIP LINE FROM BUS [COBBLKTP ] TO BUS [BLKHLWTP ] CKT1 TRIP LINE FROM BUS [COBBLKTP ] TO BUS [COBBLAKE ] CKT1 TRIP LINE FROM BUS [BLKHLWTP ] TO BUS [AULT ] CKT1 2*COBB_TIMN :TRIP LINE FROM BUS [COBBLKTP ] TO BUS [TIMNTHTP ] CKT1 TRIP LINE FROM BUS [COBBLKTP ] TO BUS [BLKHLWTP ] CKT1 TRIP LINE FROM BUS [COBBLKTP ] TO BUS [COBBLAKE ] CKT1 TRIP LINE FROM BUS [BLKHLWTP ] TO BUS [AULT ] CKT1 TRIP LINE FROM BUS [AULT ] TO BUS [WINDSOR ] CKT1 COBB_COBB :TRIP LINE FROM BUS [COBBLKTP ] TO BUS [COBBLAKE ] CKT1 1*DEL.T_DELC:TRIP LINE FROM BUS [DEL CTAP ] TO BUS [DELCAMIN ] CKT1 TRIP LINE FROM BUS [DEL CTAP ] TO BUS [LONGPEAK ] CKT1 TRIP LINE FROM BUS [DEL CTAP ] TO BUS [MEADOW ] CKT1 2*DT_LP_CL.D:TRIP LINE FROM BUS [DEL CTAP ] TO BUS [DELCAMIN ] CKT1 TRIP LINE FROM BUS [DEL CTAP ] TO BUS [LONGPEAK ] CKT1 TRIP LINE FROM BUS [DEL CTAP ] TO BUS [MEADOW ] CKT1 TRIP LINE FROM BUS [LONGPEAK ] TO BUS [CNTYLINE ] CKT1 DELC_RINN :TRIP LINE FROM BUS [DELCAMIN ] TO BUS [RINNVALL ] CKT1 DERB_DERB :TRIP LINE FROM BUS [DERBYHIL ] TO BUS [DERBHILT ] CKT1 DIXO_DRAK :TRIP LINE FROM BUS [DIXON CK ] TO BUS [DRAKE RD ] CKT1 1*DX_HRST_FI:TRIP LINE FROM BUS [DIXON CK ] TO BUS [HRSTHTAP ] CKT1 TRIP LINE FROM BUS [HRSTHTAP ] TO BUS [FLATIRON ] CKT1 TRIP LINE FROM BUS [HRSTHTAP ] TO BUS [MASONVIL ] CKT1 TRIP LINE FROM BUS [HRSTHTAP ] TO BUS [TRILBY ] CKT1 DIXO_LAPO :TRIP LINE FROM BUS [DIXON CK ] TO BUS [LAPORTAP ] CKT1 TRIP LINE FROM BUS [LAPORTAP ] TO BUS [POUDRE ] CKT1 12

13 1*DRAK_TIMB :TRIP LINE FROM BUS [DRAKE RD ] TO BUS [TIMBERLN ] CKT1 2*DRK_TB_HRM:TRIP LINE FROM BUS [DRAKE RD ] TO BUS [TIMBERLN ] CKT1 TRIP LINE FROM BUS [TIMBERLN ] TO BUS [HARMONY ] CKT1 ESTE_POLE :TRIP LINE FROM BUS [ESTES ] TO BUS [POLEHILL ] CKT1 ESTE_MARY :TRIP LINE FROM BUS [ESTES ] TO BUS [MARYLKSB ] CKT1 ESTE_MARY :TRIP LINE FROM BUS [ESTES ] TO BUS [MARYLKTP ] CKT1 1*EST_WGN_LY:TRIP LINE FROM BUS [ESTES ] TO BUS [WAGONWHL ] CKT1 TRIP LINE FROM BUS [WAGONWHL ] TO BUS [LYONS ] CKT1 FLAT_POLE :TRIP LINE FROM BUS [FLATIRON ] TO BUS [POLEHILL ] CKT1 FORD_TERR :TRIP LINE FROM BUS [FORDHAM ] TO BUS [TERRY ] CKT1 1*FORD_ROGE :TRIP LINE FROM BUS [FORDHAM ] TO BUS [ROGERSRD ] CKT1 2*TS_FRD_RR :TRIP LINE FROM BUS [FORDHAM ] TO BUS [ROGERSRD ] CKT1 TRIP LINE FROM BUS [FORDHAM ] TO BUS [TERRY ] CKT1 HARM_TIMB :TRIP LINE FROM BUS [HARMONY ] TO BUS [TIMBERLN ] CKT1 HARV_LNGM :TRIP LINE FROM BUS [HARVARD ] TO BUS [LNGMNTNW ] CKT1 1*HORS_LOVE :TRIP LINE FROM BUS [HORSESHO ] TO BUS [LOVE W ] CKT1 4*HRS_LVE_LT:TRIP LINE FROM BUS [HORSESHO ] TO BUS [LOVE W ] CKT1 TRIP LINE FROM BUS [LOVE W ] TO BUS [LOVEWTAP ] CKT1 TRIP LINE FROM BUS [LOVEWTAP ] TO BUS [CARTERLK ] CKT1 TRIP LINE FROM BUS [CARTERLK ] TO BUS [FLATIRON ] CKT1 TRIP LINE FROM BUS [LOVEWTAP ] TO BUS [VALLEYLM ] CKT1 HORS_CROS :TRIP LINE FROM BUS [HORSESHO ] TO BUS [CROSSRDS ] CKT1 1*HOYT_L.ME :TRIP LINE FROM BUS [HOYT ] TO BUS [L.MEADOW ] CKT1 TRIP LINE FROM BUS [L.MEADOW ] TO BUS [WIGGINS ] CKT1 TRIP LINE FROM BUS [WIGGINS ] TO BUS [KIOWA CK ] CKT1 2*KWCK_FM_HY:TRIP LINE FROM BUS [HOYT ] TO BUS [L.MEADOW ] CKT1 TRIP LINE FROM BUS [L.MEADOW ] TO BUS [WIGGINS ] CKT1 TRIP LINE FROM BUS [WIGGINS ] TO BUS [KIOWA CK ] CKT1 TRIP LINE FROM BUS [KIOWA CK ] TO BUS [BIJOUTAP ] CKT1 TRIP LINE FROM BUS [BIJOUTAP ] TO BUS [FMWEST ] CKT1 1*LGNW_HY_LY:TRIP LINE FROM BUS [LNGMNTNW ] TO BUS [HYGIENE ] CKT1 TRIP LINE FROM BUS [HYGIENE ] TO BUS [LYONS ] CKT1 KIOW_ORCH :TRIP LINE FROM BUS [KIOWA CK ] TO BUS [ORCHARD ] CKT1 1*KCK_WIG_LM:TRIP LINE FROM BUS [KIOWA CK ] TO BUS [WIGGINS ] CKT1 TRIP LINE FROM BUS [WIGGINS ] TO BUS [L.MEADOW ] CKT1 KODA_WHIT :TRIP LINE FROM BUS [KODAK ] TO BUS [WHITNEY ] CKT1 KODA_WHIT :TRIP LINE FROM BUS [KODAK ] TO BUS [WHITNEY ] CKT2 LAPO_BELL :TRIP LINE FROM BUS [LAPORTE ] TO BUS [BELLVUTP ] CKT1 LAPO_RAWH :TRIP LINE FROM BUS [LAPORTE ] TO BUS [RAWHIDE ] CKT1 LAPO_RAWH :TRIP LINE FROM BUS [LAPORTE ] TO BUS [RAWHIDE ] CKT2 2*LPT_RH_DX :TRIP LINE FROM BUS [LAPORTE ] TO BUS [RAWHIDE ] CKT1 TRIP LINE FROM BUS [LAPORTE ] TO BUS [RAWHIDE ] CKT2 TRIP LINE FROM BUS [LAPORTE ] TO BUS [DIXON CK ] CKT1 LAPO_TIMB :TRIP LINE FROM BUS [LAPORTE ] TO BUS [TIMBERLN ] CKT1 LAPO_DIXO :TRIP LINE FROM BUS [LAPORTE ] TO BUS [DIXON CK ] CKT1 LRS_STY*G.RE:TRIP LINE FROM BUS [LAR.RIVR ] TO BUS [STORY ] CKT1 DECREASE BUS [MBPP ] GENERATION BY 210 MW DECREASE BUS [MBPP ] GENERATION BY 210 MW 1*LIND_RICH :TRIP LINE FROM BUS [LINDEN ] TO BUS [RICHARDS ] CKT1 5*LND_RLT+4+:TRIP LINE FROM BUS [LINDEN ] TO BUS [RICHARDS ] CKT1 TRIP LINE FROM BUS [RICHRDTP ] TO BUS [POUDRE ] CKT1 TRIP LINE FROM BUS [RAWHIDE ] TO BUS [TIMBERLN ] CKT1 TRIP LINE FROM BUS [LINDEN ] TO BUS [TIMBERLN ] CKT1 TRIP LINE FROM BUS [RICHARDS ] TO BUS [RICHRDTP ] CKT1 2*L_RL_PD_RT TRIP LINE FROM BUS [LINDEN ] TO BUS [RICHARDS ] CKT1 TRIP LINE FROM BUS [RICHRDTP ] TO BUS [POUDRE ] CKT1 2*L_RL_RH_TP TRIP LINE FROM BUS [LINDEN ] TO BUS [RICHARDS ] CKT1 TRIP LINE FROM BUS [RAWHIDE ] TO BUS [TIMBERLN ] CKT1 2*L_RL_LD_TB:TRIP LINE FROM BUS [LINDEN ] TO BUS [RICHARDS ] CKT1 TRIP LINE FROM BUS [LINDEN ] TO BUS [TIMBERLN ] CKT1 2*L_RL_RT_RK:TRIP LINE FROM BUS [LINDEN ] TO BUS [RICHARDS ] CKT1 TRIP LINE FROM BUS [RICHRDTP ] TO BUS [RICHARDS ] CKT1 LIND_TIMB :TRIP LINE FROM BUS [LINDEN ] TO BUS [TIMBERLN ] CKT1 LNGM_MEAD :TRIP LINE FROM BUS [LNGMNTNW ] TO BUS [MEADOW ] CKT1 LNGM_TERR :TRIP LINE FROM BUS [LNGMNTNW ] TO BUS [TERRYTP ] CKT1 1*LGPK_CNYLN:TRIP LINE FROM BUS [LONGPEAK ] TO BUS [CNTYLINE ] CKT1 3*LGPK_CLN_D:TRIP LINE FROM BUS [LONGPEAK ] TO BUS [CNTYLINE ] CKT1 TRIP LINE FROM BUS [LONGPEAK ] TO BUS [DEL CTAP ] CKT1 TRIP LINE FROM BUS [DEL CTAP ] TO BUS [DELCAMIN ] CKT1 TRIP LINE FROM BUS [DEL CTAP ] TO BUS [MEADOW ] CKT1 LOST_LOST :TRIP LINE FROM BUS [LOST CK ] TO BUS [LOSTCKTP ] CKT1 1*LV.E_CRRD :TRIP LINE FROM BUS [LOVE E ] TO BUS [CROSSRDS ] CKT1 13

14 2*LV.E_CR_HL:TRIP LINE FROM BUS [LOVE E ] TO BUS [CROSSRDS ] CKT1 TRIP LINE FROM BUS [HARMONY ] TO BUS [TIMBERLN ] CKT1 5*LVWT_LVW++:TRIP LINE FROM BUS [CARTERLK ] TO BUS [FLATIRON ] CKT1 TRIP LINE FROM BUS [CARTERLK ] TO BUS [LOVEWTAP ] CKT1 TRIP LINE FROM BUS [LOVEWTAP ] TO BUS [VALLEYLM ] CKT1 TRIP LINE FROM BUS [LOVEWTAP ] TO BUS [LOVE W ] CKT1 TRIP LINE FROM BUS [HORSESHO ] TO BUS [LOVE W ] CKT1 LYON_ROCK :TRIP LINE FROM BUS [LYONS ] TO BUS [ROCKMTCM ] CKT1 1*AU_N_RK_OC:TRIP LINE FROM BUS [AULT ] TO BUS [NUNN ] CKT1 TRIP LINE FROM BUS [NUNN ] TO BUS [ROCKPRTP ] CKT1 TRIP LINE FROM BUS [ROCKPRTP ] TO BUS [OWL_CRK ] CKT1 6*PROS_LOST :TRIP LINE FROM BUS [PROSPEC ] TO BUS [LOSTCKTP ] CKT1 TRIP LINE FROM BUS [PROSPEC ] TO BUS [KIOWA CK ] CKT1 TRIP LINE FROM BUS [PROSPEC ] TO BUS [KERSEYTP ] CKT1 TRIP LINE FROM BUS [LOSTCKTP ] TO BUS [LOST CK ] CKT1 TRIP LINE FROM BUS [LOSTCKTP ] TO BUS [PROSPVAL ] CKT1 1*RAWH_TIMB :TRIP LINE FROM BUS [RAWHIDE ] TO BUS [TIMBERLN ] CKT1 2*RH_TP_AU :TRIP LINE FROM BUS [RAWHIDE ] TO BUS [TIMBERLN ] CKT1 TRIP LINE FROM BUS [RAWHIDE ] TO BUS [AULT ] CKT1 1*WD_SW_BSD :TRIP LINE FROM BUS [SWOODROW ] TO BUS [WOODROW ] CKT1 TRIP LINE FROM BUS [SWOODROW ] TO BUS [LSCHANCE ] CKT1 TRIP LINE FROM BUS [LSCHANCE ] TO BUS [B.SANDY ] CKT1 TERR_CNTY :TRIP LINE FROM BUS [TERRY ] TO BUS [CNTYLINE ] CKT1 TERR_ERIE :TRIP LINE FROM BUS [TERRY ] TO BUS [ERIE SW ] CKT1 TERR_TERR :TRIP LINE FROM BUS [TERRY ] TO BUS [TERRYTP ] CKT1 TIMN_BOXE :TRIP LINE FROM BUS [TIMNTHTP ] TO BUS [BOXELDER ] CKT1 WELD_BOOM :TRIP LINE FROM BUS [WELD LM ] TO BUS [BOOMERNG ] CKT1 WIND_WIND :TRIP LINE FROM BUS [WINDSOR ] TO BUS [WINDSORT ] CKT1 VALL_DERB :TRIP LINE FROM BUS [VALLEYLM ] TO BUS [DERBHILT ] CKT1 1*RV_DKNO_EE:TRIP LINE FROM BUS [RINNVALL ] TO BUS [DACONO ] CKT1 TRIP LINE FROM BUS [ERIE SW ] TO BUS [DACONO ] CKT1 BRAC_WHIT :TRIP LINE FROM BUS [BRACEWLL ] TO BUS [WHITNEY ] CKT1 BRAC_WHIT :TRIP LINE FROM BUS [BRACEWLL ] TO BUS [WHITNEY ] CKT2 2*BRAC_WHIT :TRIP LINE FROM BUS [BRACEWLL ] TO BUS [WHITNEY ] CKT1 TRIP LINE FROM BUS [BRACEWLL ] TO BUS [WHITNEY ] CKT2 14

15 C. Monitored Buses

16 D. Monitored Elements BRUSH SS B.CK PS BRUSH SS B.CK PS FTLUPTON FTLUPTON T FTLUPTON PAWNEE FTLUPTON ST.VRAIN FTLUPTON ST.VRAIN FTLUPTON JLGREEN FTLUPTON HENRYLAK GODFRETP GREELEY GODFRETP JOHNSTN GREELEY MONFORT GREELEY WELD PS JOHNSTN WELD PS LAPORTPS LAPORTE MONFORT UNC PAWNEE PTZLOGN ROSEDALE UNC ROSEDALE ARROWHLK B.CK PS B.CK PS T B.CK PS BEAVERCK ST.VRAIN WELD PS ST.VRAIN WINDSOR ST.VRAIN LONGPEAK ST.VRAIN FORDHAM WELD PS WELD PS T WELD PS ARROWHLK WELD PS WELD LM WELD PS WELD LM WINDSOR AULT BERTHOUD LONETREE BERTHOUD GATEWYTS HENRYLAK HENRYLAK HENRYLAK BROMLEY KEENSBG CEDARCRK AIRPORT BOYD AIRPORT WINDSORT AIRPORT KELIM AULT AULT AULT AULT AULT AULT AULT RAWHIDE AULT TIMBERLN AULT WELD LM AULT WELD LM B.CK TRI B.CK TRI B.CK TRI BEAVERCK BEAVERCK BRUSHTAP BEAVERCK GARY BEAVERCK ADENA BLKHLWTP COBBLKTP BLKHLWTP AULT BOYD BOYD BOYD BOYD BOYD LOVE E BOYD VALLEYLM

17 73026 BOYD GATEWYTS BOYD DERBHILT BOYD LONGPEAK BRIGHTNW SANDCRK BRIGHTNW ERIE SW CARTERLK FLATIRON CARTERLK LOVEWTAP COBBLKTP TIMNTHTP COBBLKTP COBBLAKE DEL CTAP DELCAMIN DEL CTAP LONGPEAK DEL CTAP MEADOW DELCAMIN RINNVALL DERBYHIL DERBHILT DIXON CK DRAKE RD DIXON CK HRSTHTAP DIXON CK DIXON CK DIXON CK DIXON CK DIXON CK LAPORTAP DRAKE RD TIMBERLN ESTES POLEHILL ESTES MARYLKTP ESTES WAGONWHL FLATIRON HRSTHTAP FLATIRON POLEHILL FORDHAM ROGERSRD FORDHAM FORDHAM FORDHAM FORDHAM GARY WOODROW HARMONY TIMBERLN HARVARD LNGMNTNW HORSESHO LOVE W HORSESHO CROSSRDS HORSESHO HORSESHO HORSESHO HORSESHO HOYT L.MEADOW HOYT ADENA HOYT SANDCRK HRSTHTAP TRILBY HRSTHTAP MASONVIL HYGIENE LNGMNTNW HYGIENE LYONS KERSEYTP PROSPEC KERSEYTP BOOMERNG KIOWA CK ORCHARD KIOWA CK PROSPEC KIOWA CK WIGGINS KODAK WHITNEY KODAK WHITNEY L.MEADOW WIGGINS LAPORTE LAPORTE LAPORTE BELLVUTP LAPORTE RAWHIDE LAPORTE RAWHIDE LAPORTE TIMBERLN LAPORTE DIXON CK LNGMNTNW MEADOW LNGMNTNW TERRYTP

18 73115 LONGPEAK LONGPEAK LONGPEAK LONGPEAK LONGPEAK LONGPEAK LONGPEAK CNTYLINE LOVE E CROSSRDS LOVE W LOVEWTAP LOVEWTAP VALLEYLM LYONS ROCKMTCM LYONS WAGONWHL NUNN ROCKPRTP NUNN AULT POUDRE RICHRDTP POUDRE LAPORTAP RAWHIDE TIMBERLN RICHARDS RICHRDTP ROCKPRTP OWL_CRK TIMBERLN TIMBERLN TIMNTHTP RICHRDTP TIMNTHTP BOXELDER WELD LM WELD LM WELD LM BOOMERNG WELD LM WHITNEY WINDSOR WINDSORT MARYLKPP MARYLKTP BELLEVUE BELLVUTP BELLVUTP RIPPLE VALLEYLM DERBHILT WINDSORT WHITNEY ROGERSRD TERRYTP DIXON CK HORSESHO RINNVALL DACONO DACONO ERIE SW PONNEQUI OWL_CRK BRACEWLL WHITNEY BRACEWLL WHITNEY INTERFACE TOT INTERFACE TOT