BC HYDRO REAL TIME OPERATIONS SYSTEM OPERATING ORDER 7T-35. PEACE 138/230 kv NETWORK OPERATION Supersedes 7T-35 issued 15 June 2017

Transcription

1 BC HYDRO REAL TIME OPERATIONS SYSTEM OPERATING ORDER 7T-35 PEACE 138/230 kv NETWORK OPERATION Supersedes 7T-35 issued 15 June 2017 Review Year: 2021 Original signed by Brett Hallborg for: APPROVED BY: Paul Choudhury General Manager Real Time Operations Denotes Revision

2 Page 2 of GENERAL This Operating Order describes the Peace 138/230 kv Network operations, outage requirements, and Peace Region Load Shedding RAS and Peace Region Local Gen Shedding RAS arming requirements. The Peace Region Local Gen Shedding RAS has been developed and implemented to accommodate the interconnections of Wind Farm IPPs in that area. Wind Farm IPPs interconnection studies show the loss of 2L308 (GMS-DKT) or loss of 2L309 (DKT-SNK) can result in large excursions or 138 kv system thermal loading issues in Peace 138/230 KV network area. Generation shedding at Dokie, Quality, and Meikle has been made available for loss of any above 230 kv lines. Refer to Appendix 3 for a table of arming functions for the Peace Region Local Gen Shedding RAS. The Peace Region Load Shedding RAS has been developed and implemented to meet the needs of the load growth in South Peace Area as the area loads are supplied by both 230 kv path and 138 kv circuits in parallel. This RAS consists of two major schemes, a System Wide Area Protection Scheme (WAPS) and a Local Area Protection Schemes (LAPS): The WAPS sheds loads at South Peace Region to prevent voltage collapse and other performance issues following loss of the 230 kv transmission lines/transformers, or major 138 kv transmission lines/transformers when 230 kv facilities are out of service. Refer to Appendix 2 for detailed description of the WAPS. The LAPS is implemented to maintain voltage stability of the South Peace 138 kv system triggered by the loss of 1L361 (GMS-CWD) or 1L377 (-TAY). The LAPS consist of two separate schemes - LAPS and CWD LAPS and can be enabled separately. Both WAPS and LAPS are armed by TSA-PM algorithms in the BC Hydro EMS. Islanded operation in the 230 kv Peace Regional system is not permitted, as it may cause overvoltage and equipment damage. An anti-islanding DTT scheme has been developed and implemented to trip the 230 kv CBs at the appropriate BCH substations, to remove IPP generation resources when an island is formed by an event. This anti-islanding DTT schemes will monitor the following circuits status to identify islanding: GMS T13 & GMS T14 2L308 (GMS-DKT) 2L309 (DKT-SNK) 2L313 (SNK-MKT) 2L337 (MKT-TLR) 2L312 (SNK-SLS) Refer to Appendix 4 for the details about the direct transfer tripping (DTT) requirements. A sketch (overview) of the Peace Region Network is attached in Appendix RESPONSIBILITIES The Transmission Coordinator is responsible for monitoring the load shedding arming recommendations from TSA-PM, and determine when manual load shedding will be required (either due to TSA-PM failure or outage, LAPS outages, or insufficient load shedding has occurred). When manual load shedding is required, the Grid Desk 1 Operator is responsible to ensure that area loads are monitored, and will coordinate with the Load Desk 1 Operator to arrange for

3 Page 3 of 34 manual shedding and restoration of Distribution connected customers and feeders in accordance with Section The Grid Desk 1 Operator will be responsible for shedding Transmission connected customers under Section 4.2.7, and restoring in accordance with Section 5.0. All instructions for Manual Load Shedding implementation will be issued using three-part communications protocol: The Transmission Coordinator will request Grid Desk 1 Operator take manual load shedding actions. The Grid Desk 1 Operator will assess the system conditions and give the instruction to the Load Desk 1 Operator. The Load Desk 1 Operator will repeat-back the instruction as it was understood, and Receive an acknowledgement from the Grid Desk 1 Operator that the instruction was correctly understood before proceeding. 3.0 NORMAL OPERATIONS The Peace 138/230 kv network is supplied by GM Shrum (GMS), Dokie Wind Farm IPP (DKW), Quality Wind Farm IPP(QTY), Bear Mountain Wind Farm IPP (BMW), Meikle Wind Farm IPP (MKL), and McMahon Cogeneration IPP (MCM). The network supplies approximately 485 MW of regional load in the Fort St. John, Dawson, Groundbirch, and Tumbler Ridge, and Chetwynd communities/areas. This network may be operated at or near capacity during winter peak load. The Peace network is connected at GMS Generating Station to the integrated electric system. The generation resources in the Peace 138/230 kv network are limited (approximately 680 MW of IPP Generation), and approximately 80% is non-dependable (intermittent or variable) generation. The Dawson Chetwynd area transmission has been reinforced with the following circuits, capacitor banks and switching station additions: A 138 kv/230 kv substation - Sundance Substation (SLS) at the intersection of 1L358 (138kV CWD-BMT line) and 2L312 (230kV Sukunka Chetwynd Mechanical pulp (SNK- LAP) line). A termination of 2L312 at SLS Substation, and the renaming of the section from SLS to LAP as 2L330. Two 230 kv lines from SLS to BMT. A 230 kv switching station Shell Groundbirch (SGB) in between SLS and BMT, to accommodate load interconnection. Three 230 kv 35 MVAR switchable capacitor banks at SGB. Two 138 kv lines (1L348 and1l350) from BMT to (constructed to 230 kv but operated at the 138 kv voltage level) kv Network The Peace 230 kv Network has three IPP plants, several TVCs and a BC Hydro distribution substation. DKW IPP can generate up to 144 MW. DKW consists of 48 wind powered generators yielding a maximum of 3 MW output each via 6 separate feeders. DKW is connected to the BC Hydro system at Dokie Terminal Station (DKT) on a 230 kv transmission line 2L314. QTY IPP can generate up to MW. QTY consists of 79 wind-powered generators yielding 1.8 MW each. QTY is connected to the BCH system at Tumbler Ridge Substation (TLR) on 230 kv transmission line 2L315.

4 Page 4 of 34 MKL can generate up to MW. MKL consists of 61 wind-powered generators yielding 3.23 MW each with 35 units, and 2.75 MW each with 26 units. MKL is connected to the BC Hydro transmission system at Meikle Switching Station (MKT) via a 4.2 km, customer-owned 230 kv transmission line designated 2L339. Table 3.1 summarizes the TVCs in the 230 kv Peace network and Table 3.2 provides the peak load value for the area distribution load. Applicable note references for both tables can be found at the end of Section 3.2. Table 3.1: Peace 230kV Network TVCs 1, 2 STN Station Name Peak Load [MW] Voltage Band [±%] BLM 3 Talisman Energy Canada KGP 3 Westcoast Energy Inc LAP Chetwynd Mechanical Pulp Inc MNK 3 Western Coal Corp QNT 3 Teck Coal Ltd SGB Shell Canada Table 3.2: Peace 230 kv Network Area Distribution Load 4, 5 Station Name STN Peak Load (MW) Tumbler Ridge TLR kv Network The Peace 138 kv Network has two IPP plants, several TVCs and four BC Hydro distribution substations. MCM IPP has 110 MW of dependable generation. MCM consists two 55 MW units of gas fired turbine. The hot exhaust gases from the gas turbines, after driving the two electrical generators, are also used in producing the steam for the Spectra Energy Transmission McMahon gas plant (MGP). MCM is connected to the BC Hydro system on 1L375. BMW IPP can generate up to 104 MW. BMW connects to the BC Hydro system at Bear Mountain Terminal Station (BMT) on a 138 kv transmission line designated 1L354. Table 3.3 summarizes the TVCs in the 138 kv Peace network and Table 3.4 provides the peak load value for the area distribution load

5 Page 5 of 34 Table 3.3: Peace 138 kv Network TVC 1, 2 STN Station Name Peak Load [MW] Voltage Band [±%] FBC Canadian Forest Product Ltd 62 5 KIS Encana MGP Westcoast Energy Inc NL2 Apache Canada Ltd /-12.5 NL3 Apache Canada Ltd /-12.5 NL5 Apache Canada Ltd /-12.5 NGL Taylor Gas Liquid Ltd SEP Canadian Natural Resource SLO Canfor TXB Imperial Oil Resources 7 10 Table 3.4: Peace 138 kv Network Area Distribution Load 4, 5 Station Name STN Peak Load [MW] Chetwynd CWD 29.4 Dawson Creek 91.4 Fort St John FJN 81 Fox Creek FOX 17.0 Site C SCX 5 1. For industrial customer load, Peak Load (MW) is based on the 2015 Transmission Peak Demand Forecast. Maximum MW is approximated by using the MVA forecast in Transmission Peak Demand Forecast. The contract demand is only used if it accurately reflects the operating history, confirmed with e-meter data peaks report, otherwise e-meter data may replace the forecast. 2. Voltage Band (±%) is based on the contract voltage supply on the Local Operating Order, or the Energy Service Agreement. 3. DTT to 2L312 during a 2L308 or 2L309 outage results in the curtailment of KGP, MNK, BLM, and QNT. 4. Station or Circuit and STN columns are based on Operating One-lines and Operating Order designations, where any conflict exists with SCFMS database. 5. Peak Load (MW) is based on the July 2015 BC Hydro Substation Load forecast for the 2016 fiscal year. Using the substation load forecast (high with DSM), the maximum is obtained by multiplying the substation s forecast normal temperature uncompensated peak MVA with the substation s natural power factor. For winter peaking substations, normal temperature is the 50 year average annual lowest temperature ; the actual substation peak will vary with the actual low temperature. Forecasted substation loads are non-coincidental.

6 Page 6 of PEACE REGION LOAD SHEDDING RAS AND GENERATION SHEDDING RAS ARMING REQUIREMENTS The Peace Region Load Shedding RAS has two schemes, a WAPS and a LAPS: The WAPS sheds loads at South Peace Region to prevent voltage collapse and other performance issues following loss of the 230 kv transmission lines/transformers, or major 138 kv transmission lines/transformers when 230 kv facilities are out of service. The WAPS is used to address transient stability, voltage limits and thermal limits. The LAPS detects overloads (cut plane flow) to initiate load shed at and/or CWD substation, to prevent a voltage collapse of the regional system following the loss of either 1L361 or 1L377 transmission lines, when 230 kv system from GMS (2L308 / 2L309 / 2L312) is out of service. 4.1 General System Information and Requirements Transmission Line Ratings Peace Region Load Shed RAS arming conditions are impacted by seasonal ratings for transmission lines. Table and Table listed the concerned transmission line continuous ratings and emergency ratings. Note 1: The thermal rating data is from OO 5T-10 Ratings For All Transmission Circuits 60 kv or Higher in effect at the issuance of this order. Please refer to OO 5T-10 for the definitions of Summer Season and Winter Season. Note 2: The continuous rating in amps is used as its over-load rating as there has been no over-load rating determined. Note 3: 1L377_Over_Rating in MW is calculated by * Rating in KA *131 kv * 0.95 pf since TAY 138 kv bus voltage will be around 0.95 pu or even lower post contingencies. TSA-PM changes ratings for use in the load shedding requirements (Table and 4.1.2). Table 4.1.1: Transmission Line Continuous Ratings 138kV Circuit Variable Name Used in Load Shedding Tables Conductor (Amp) (Note 1) Continuous-Rating Corresponding Continuous MW Rating (MW = * Rating in KA *138 kv * 0.95 pf) Summer Season Winter Season Summer Season Winter Season Based on 30º C Based on 0º C Based on 30º C Based on 0º C ambient ambient ambient ambient 1L377 1L377_Norm_Rating L361 1L361_Norm_Rating L364 1L364_Norm_Rating

7 Page 7 of 34 Table 4.1.2: Transmission line Emergency Ratings 138kV Circuit Variable Name Used in Load Shedding Tables Conductor Over-Rating (Amp) (Note 2) Corresponding Over MW Rating (MW = * Rating in KA *138 kv * 0.95 pf) Summer Season Winter Season Summer Season Winter Season Based on 30º C Based on 0º C Based on 30º C Based on 0º C ambient ambient ambient ambient 1L377 1L377_Over_Rating (Note 3) 140 (Note 3) 1L361 1L361_Over_Rating L364 1L364_Over_Rating KV Transmission Lines Over-Voltage Protection The following Over-Voltage protection settings have been implemented in SLS 1L349, BMT 1L348 and BMT 1L350: 165 KV phase to phase (20%) trips after 5 sec 180 KV phase to phase (30%) trips after 5 cycles 185 KV phase to phase (approx. 35%) trips after 1 cycle Under light load scenario, after loss of 2L308 or 2L309, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed in SLS and BMT area, and 1L349 / 1L348 / 1L350 may be tripped by their over voltage protection specified above Customer Load Under-Voltage Protection There are Under-Voltage protection settings for the following loads: ENK E15: Under-voltage Trip Pickup is 0.70 pu Under-voltage Trip Delay is 0.5 s Applicable to both A & B transformer protection ENK KIS: Under-voltage Trip Pickup is 0.70 pu Under-voltage Trip Delay is 0.5 s Applicable to both A & B transformer protection SRN: Under-voltage Trip Pickup is 0.75 pu Under-voltage Trip Delay is 2 s These under-voltage protection schemes have been taken into considerations when developing the load shedding recommendations and gen shedding recommendations in Table to Table Peace Region RAS Arming Requirements for Various Peace Region System Conditions General Information The following notes are applicable to all contingencies in Table to Table : Note 1: KIS_L is the load in MW measured at ENK KIS substation; Encana 15-27_L is the load in MW measured at ENK Encana Substation;

8 Page 8 of 34 SRN_L is the load in MW measured at SGB substation; PPS_L is the load in MW measured at PPS substation; STC_L is the load in MW measured at Site C construction site. ET3_L is the load in MW measured at ET3 substation. Note 2: Do not arm load shedding if the load is less than 3 MW, except feeders. Note 3: DTT 2L312 shall be armed only if 2L308 GMS + 2L312 SLS 10 MW. Under this condition, DTT of 2L312 is equivalent of reducing load supplied by 1L377 and 1L361, and therefore can be considered as load shedding. Note 4: CP is an abbreviation for Cut Plane for Load Shedding. GCP is an abbreviation for Cut Plane for Generation Shedding. Note 5: Refer to Appendix 2 - Note 3 for load shedding priority list at feeders.

9 Page 9 of Peace Region Load Shedding and Gen Shedding Requirements Peace Region Load Shedding and Gen Shedding Requirements for various system conditions have been specified in the following tables: Table 4.2.1: CONTINGENCY System Normal - All South Peace Region 230 kv and 138 kv Circuits in Service LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS CP = 2L308 GMS + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, Generation shedding amount: GS = - B - GCP rating 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all on line SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CP rating = 220 for summer season; CP rating = 240 for winter season. GCP rating=185 for summer season; GCP rating=245 for winter season. In light load, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed and operations will rely on the over voltage protection. CP = 2L309 DKT + 1L361 GMS + 1L377 TAY B = CP - ( KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS=A - CPrating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW 170 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW < 170 MW, then DTT 2L312 LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) QTY, (2) MKL CPrating = 220 for summer season; CPrating = 240 for winter season. GCP rating = 185 for summer season; GCP rating = 245 for winter season. In light load, BMW, QTY, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed and operations will rely on the over voltage protection. Load shedding amount: LS = (2L312 SNK + 1L361 GMS + 1L377 TAY) A MW (1) SRN, KIS, or E15; (2) E42, BPN, or ET3; (3) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, A = 220 for summer season; A = 240 for winter season. Load shedding amount: LS = (2L340 SLS + 2L342 SLS + 1L377 TAY) 1L377_Over_Rating MW (1) SRN, KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, Load shedding amount: LS = (2L329 SGB + 2L333 SGB + 1L377 TAY) 1L377_Over_Rating MW (1) KIS or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, No shedding is required. NOTES: KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. When the fault is on 500 kv side of the transformer, NGL synchronous motors may go out of step. No shedding is required. NOTE: KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. No load shedding is required No shedding is required. NOTE: KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. Load shedding amount: LS = (1L348 BMT + 1L350 BMT + 1L377 TAY) A MW A = MIN (A1, 1L377_Over_Rating) A1 = * (1L364 GMS + 1L374 GMS + 1L360 GMS 1L377 TAY) Note: (1) ET3; (2) feeders. No shedding is required. NOTE: KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. No shedding is required. NOTE: KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. No shedding is required. DTT one 138 kv shunt cap if more than 3 are online KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer.

10 Page 10 of 34 Table 4.2.2: 2L313 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 1L348 and 1L350 1L349 1L361 1L377 CP = 2L308 GMS + 1L361 GMS + 1L377 TAY Load shedding amount: LS = CP - CP rating LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both CP = 2L309 DKT + 1L361 GMS + 1L377 TAY Load shedding amount: LS = CP - CP rating CP rating=220 for summer season; CP rating=240 for winter season. LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both CP rating=220 for summer season; CP rating=240 for winter season. Table 4.2.3: 2L329 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS Load shedding amount: LS = (2L333 SGB + 1L377 TAY) 1L377_Over_Rating MW (1) KIS or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, No shedding is required. NOTE: KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. Table 4.2.4: 2L333 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS Load shedding amount: LS = (2L329 SGB + 1L377 TAY) 1L377_Over_Rating MW (1) KIS or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, Same as Table L329 OOS

11 Page 11 of 34 Table 4.2.5: 2L340 OOS CONTINGENCY 2L308 2L309 2L312 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS Load shedding amount: LS = (2L342 SLS + 1L377 TAY) 1L377_Over_Rating MW (1) SRN, KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, Same as Table L329 OOS Table 4.2.6: 2L342 OOS CONTINGENCY 2L308 2L309 2L312 2L340 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS Load shedding amount: LS = (2L340 SLS + 1L377 TAY) 1L377_Over_Rating MW (1) SRN, KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, Same as Table L329 OOS

12 Page 12 of 34 Table 4.2.7: 1L348 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS CP = 2L308 GMS + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, Generation shedding amount: GS = - B - GCP rating LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CPrating = 220 for summer season; CPrating = 240 for winter season. GCPrating = 192 for summer season; GCPrating = 245 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. CP = 2L309 DKT + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW 180 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW < 180 MW, then DTT 2L312 LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) QTY, (2) MKL CPrating = 220 for summer season; CPrating = 240 for winter season. GCPrating = 192 for summer season; GCPrating = 245 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. Same as Table L329 OOS Load shedding amount: LS = (1L350 BMT + 1L377 TAY) A MW A = MIN (A1, 1L377_Over_Rating) A1 = * (1L364 GMS + 1L374 GMS + 1L360 GMS 1L377 TAY) Note: (1) ET3; (2) feeders.

13 Page 13 of 34 Table 4.2.8: 1L349 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS CP = 2L308 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW + DKW_MW 150 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW + DKW_MW < 150 MW, then DTT 2L312 LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CP rating = 110 for summer season; CP rating = 140 for winter season. GCP ratin g= 110 for summer season; GCP rating = 140 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. CP = 2L309 DKT + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW 180 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW < 180 MW, then DTT 2L312 LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) QTY, (2) MKL CP rating = 110 for summer season; CP rating = 140 for winter season. GCP rating = 110 for summer season; GCP rating = 140 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. Load shedding amount: LS = (2L312 SNK + 1L377 TAY) 1L377_Over_Rating MW (1) SRN, KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, Same as Table L329 OOS No shedding is required. DTT one 138 kv shunt cap if more than 3 are online KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. If BMW_MW + QTY_MW + MKL_MW + DKW_MW is more than 90% of total MW capacity, under the light load conditions and high ambient temperature, 2L308 might be overloaded, which requires manual action by the system operator. Table 4.2.9: 1L350 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 1L349 1L361 1L377 Same as Table L348 OOS Same as Table L348 OOS LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS Same as Table L329 OOS Load shedding amount: LS = (1L348 BMT + 1L377 TAY) A MW A = MIN (A1, 1L377_Over_Rating) A1 = * (1L364 GMS + 1L374 GMS + 1L360 GMS 1L377 TAY) Note: (1) ET3; (2) feeders.

14 Page 14 of 34 Table : 1L360 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS CP = 2L308 GMS + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0 If CP + DKW_MW + BMW_MW + QTY_MW + MKL_MW 130 MW, Generation shedding amount: GS = - B - GCP rating If CP + DKW_MW + BMW_MW + QTY_MW + MKL_MW < 130 MW, then DTT 2L312 LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CP rating = 200 for summer season; CP rating = 210 for winter season. GCP rating = 192 for summer season; GCP rating = 245 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. CP = 2L309 DKT + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW 180 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW < 180 MW, then DTT 2L312 LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) QTY, (2) MKL CP rating = 200 for summer season; CP rating = 210 for winter season. GCP rating = 192 for summer season; GCP rating = 245 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. Load shedding amount: LS = (2L312 SNK + 1L361 GMS + 1L377 TAY) A MW (1) SRN, KIS, or E15; (2) E42, BPN, or ET3; (3) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, A = 185 for summer season; A = 200 for winter season. Load shedding amount: LS = MAX(LS1, LS2) LS1 = (2L340 SLS + 2L342 SLS + 1L377 TAY) A MW LS2 = (2L340 SLS + 2L342 SLS + 1L364 GMS + 1L374 GMS) B MW (1) SRN, KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, A = 100 for summer season; A = 115 for winter season. B = 250 for summer season; B = 280 for winter season. For summer season, Load shedding amount: LS = MAX(LS1, LS2) LS1 = (2L329 SGB + 2L333 SGB + 1L377 TAY) 100 MW LS2 = (2L329 SGB + 2L333 SGB + 1L364 GMS + 1L374 GMS) 250 MW For winter season, Load shedding amount: LS = (2L329 SGB + 2L333 SGB + 1L377 TAY) A MW A = MIN (A1, 135) A1 = * (1L364 GMS + 1L374 GMS 1L377 TAY) (1) KIS or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, Same as Table L329 OOS Load shedding amount: LS = (1L348 BMT + 1L350 BMT + 1L377 TAY) A MW A = MIN (A1, 1L377_Over_Rating) A1 = * (1L364 GMS + 1L374 GMS 1L377 TAY) Note: (1) ET3; (2) feeders.

15 Page 15 of 34 Table : 1L361 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS CP = 2L308 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW + DKW_MW 150 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW + DKW_MW < 150 MW, then DTT 2L312 LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CP rating = 110 for summer season; CP rating = 140 for winter season. GCP rating = 110 for summer season; GCP rating = 138 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. CP = 2L309 DKT + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW 180 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW < 180 MW, then DTT 2L312 LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) QTY, (2) MKL CP rating = 110 for summer season; CP rating = 140 for winter season. GCP rating = 110 for summer season; GCP rating = 138 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. Same as Table L349 OOS Same as Table L329 OOS Same as Table L349 OOS

16 Page 16 of 34 Table : 1L364 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS CP = 2L308 GMS + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + DKW_MW + BMW_MW + QTY_MW + MKL_MW 120 MW, Generation shedding amount: GS = - B - GCP rating If CP + DKW_MW + BMW_MW + QTY_MW + MKL_MW < 120 MW, then DTT 2L312 LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CP rating = 217 for summer season; CP rating = 230 for winter season. GCP rating = 200 for summer season; GCP rating = 245 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. CP = 2L309 DKT + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW 180 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW < 180 MW, then DTT 2L312 LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) QTY, (2) MKL CP rating = 217 for summer season; CP rating = 230 for winter season. GCP rating = 200 for summer season; GCP rating = 245 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. Same as Table L360 OOS Load shedding amount: LS = MAX(LS1, LS2) LS1 = (2L340 SLS + 2L342 SLS + 1L377 TAY) A MW LS2 = (2L340 SLS + 2L342 SLS + 1L374 GMS + 1L360 GMS) B MW (1) SRN, KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, A = 95 for summer season; A = 120 for winter season. B = 245 for summer season; B = 280 for winter season. For summer season, Load shedding amount: LS = MAX(LS1, LS2) LS1 = (2L329 SGB + 2L333 SGB + 1L377 TAY) 100 MW LS2 = (2L329 SGB + 2L333 SGB + 1L374 GMS + 1L360 GMS) 250 MW For winter season, Load shedding amount: LS = (2L329 SGB + 2L333 SGB + 1L377 TAY) A MW A = MIN (A1, 135) A1 = * (1L374 GMS + 1L360 GMS 1L377 TAY) (1) KIS or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, Same as Table L329 OOS Load shedding amount: LS = (1L348 BMT + 1L350 BMT + 1L377 TAY) A MW A = MIN (A1, 1L377_Over_Rating) A1 = * (1L374 GMS + 1L360 GMS 1L377 TAY) Note: (1) ET3; (2) feeders.

17 Page 17 of 34 Table : 1L367 OOS CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS CP = 2L308 GMS + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + DKW_MW + BMW_MW + QTY_MW + MKL_MW 120 MW, Generation shedding amount: GS = - B - GCP rating If CP + DKW_MW + BMW_MW + QTY_MW + MKL_MW < 120 MW then DTT 2L312 LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CP rating = 220 for summer season; CP rating = 240 for winter season. GCP rating = 183 for summer season; GCP rating = 195 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. CP = 2L309 DKT + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW 170 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW < 170 MW, then DTT 2L312 LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) QTY, (2) MKL CP rating = 220 for summer season; CP rating = 240 for winter season. GCP rating = 183 for summer season; GCP rating = 195 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. Load shedding amount: LS = (2L312 SNK + 1L361 GMS + 1L377 TAY) A MW (1) SRN, KIS, or E15; (2) E42, BPN, or ET3; (3) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, A = 200 for summer season; A = 210 for winter season. Load shedding amount: LS = MAX(LS1, LS2) LS1 = (2L340 SLS + 2L342 SLS + 1L377 TAY) A MW LS2 = (2L340 SLS + 2L342 SLS + 1L360 GMS) B MW (1) SRN, KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, A = 1L377_Over_Rating for summer season; A = 130 for winter season. B = 120 for summer season; B = 135 for winter season. Load shedding amount: LS = MAX(LS1, LS2) LS1 = (2L329 SGB + 2L333 SGB + 1L377 TAY) A MW LS2 = (2L329 SGB + 2L333 SGB + 1L360 GMS) B MW (1) KIS or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, A = 1L377_Over_Rating for summer season; A = 120 for winter season. B = 120 for summer season; B = 135 for winter season. Same as Table L329 OOS Load shedding amount: LS = (1L348 BMT + 1L350 BMT + 1L377 TAY) A MW A = MIN (A1, 1L377_Over_Rating) A1 = * (1L360 GMS 1L377 TAY) Note: (1) ET3; (2) feeders.

18 Page 18 of 34 Table : 1L374 OOS Note 1: study results are based on a condition that PPS load is supplied by 1L364 and STC load is supplied by 1L360 when 1L374 OOS. CONTINGENCY 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L349 1L361 1L377 LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS CP = 2L308 GMS + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + DKW_MW + BMW_MW + QTY_MW + MKL_MW 120 MW, Generation shedding amount: GS = - B - GCP rating If CP + DKW_MW + BMW_MW + QTY_MW + MKL_MW < 120 MW, then DTT 2L312 LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CP rating = 208 for summer season; CP rating = 212 for winter season. GCP rating = 192 for summer season; GCP rating = 245 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. CP = 2L309 DKT + 1L361 GMS + 1L377 TAY B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CP rating If B < 0, If CP + BMW_MW + QTY_MW + MKL_MW 150 MW, Generation shedding amount: GS = - B - GCP rating If CP + BMW_MW + QTY_MW + MKL_MW < 150 MW, then DTT 2L312 LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply DTT all online SGB 230 kv shunt capacitors if SRN load is shed and DTT one BMT 138 kv shunt capacitor if both Gen shedding sequence: (1) QTY, (2) MKL CP rating = 208 for summer season; CP rating = 212 for winter season. GCP rating = 192 for summer season; GCP rating = 245 for winter season. Under very light load situation, BMW, QTY, DKW, and MKL units may be tripped due to their protection settings. In this case, high voltages may be observed. For that, system can rely on the developed Over Voltage protection. Same as Table L360 OOS Load shedding amount: LS = MAX(LS1, LS2) LS1 = (2L340 SLS + 2L342 SLS + 1L377 TAY) A MW LS2 = (2L340 SLS + 2L342 SLS + 1L364 GMS + 1L360 GMS) B MW (1) SRN, KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, A = 100 for summer season; A = 120 for winter season. B = 250 for summer season; B = 285 for winter season. For summer season, Load shedding amount: LS = MAX(LS1, LS2) LS1 = (2L329 SGB + 2L333 SGB + 1L377 TAY) 100 MW LS2 = (2L329 SGB + 2L333 SGB + 1L364 GMS + 1L360 GMS) 250 MW For winter season, Load shedding amount: LS = (2L329 SGB + 2L333 SGB + 1L377 TAY) A MW A = MIN (A1, 1L377_Over_Rating) A1 = * (1L364 GMS + 1L360 GMS 1L377 TAY) (1) KIS, or E15; (2) E42 or BPN; (3) ET3; (4) feeders. DTT one BMT shunt capacitor if both 1CX1 and 1CX2 are on line in service AND total load shedding amount at KIS, Same as Table L329 OOS Load shedding amount: LS = (1L348 BMT + 1L350 BMT + 1L377 TAY) A MW A = MIN (A1, 1L377_Over_Rating) A1 = * (1L364 GMS + 1L360 GMS 1L377 TAY) Note: (1) ET3; (2) feeders.

19 Page 19 of 34 Table : 1L377 OOS Pre-outage restrictions: Keep at least one 25kV or 138 kv shunt capacitor on line in service if 1L361 GMS + 2L312 SNK >= 125 MW. CONTINGENCY LOAD SHEDDING OR GENERATION SHEDDING REQUIREMENTS 2L308 2L309 2L312 2L340 and 2L342 2L329 and 2L333 GMS T11 & T13, or GMS T12 & T14 2L313 2L315 2L337 1L348 and 1L350 1L361 1L349 CP = 2L308 GMS + 1L361 GMS B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CPrating DTT all online SGB 230 kv shunt capacitors if SRN load is shed DTT 138 kv shunt capacitors until maximum one capacitor remains online. DTT all online BMT 138 kv shunt capacitors (If BMW MW output is greater than 50 MW, DTT one BMT cap if more than one is online) If B < 0, If (1L377 is open ended at only, OR open ended at both and TAY) AND (CP + BMW_MW + DKW_MW + QTY_MW + MKL_MW) 120 MW, or If (1L377 is open ended at TAY only) AND (CP + BMW_MW + DKW_MW + QTY_MW + MKL_MW) 130 MW Generation shedding amount: GS = - B GCPrating DTT all 138 kv shunt capacitors If (1L377 is open ended at only, OR open ended at both and TAY) AND (CP + BMW_MW + DKW_MW + QTY_MW + MKL_MW) < 120 MW, or If (1L377 is open ended at TAY only) AND (CP + BMW_MW + DKW_MW + QTY_MW + MKL_MW) < 130 MW DTT 2L312 DTT all 138 kv shunt capacitors Load shedding sequence (ET3 will participate in load shed only when 1L377 is open ended at TAY): LS hasn t been met and (2L308 GMS + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L308 GMS + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L308 GMS + 2L312 SLS), then apply Gen shedding sequence: (1) DKW, (2) QTY, (3) MKL CPrating = 127 for summer season; CPrating = 136 for winter season. CP = 2L309 DKT + 1L361 GMS B = CP - (KIS_L + E15_L + SRN_L) If B >= 0, Load shedding amount: LS = A - CPrating GCPrating = 105 for summer season; GCPrating = 113 for winter season. DTT all online SGB 230 kv shunt capacitors if SRN load is shed DTT 138 kv shunt capacitors until maximum one capacitor remains online. DTT all online BMT 138 kv shunt capacitors (If BMW MW output is greater than 50 MW, DTT one BMT cap if more than one is online) If B < 0, If (1L377 is open ended at only, OR open ended at both and TAY) AND (CP + BMW_MW + QTY_MW + MKL_MW) 120 MW, or If (1L377 is open ended at TAY only) AND (CP + BMW_MW + QTY_MW + MKL_MW) 130 MW Generation shedding amount: GS = - B GCPrating DTT all 138 kv shunt capacitors If (1L377 is open ended at only, OR open ended at both and TAY) AND (CP + BMW_MW + QTY_MW + MKL_MW) < 120 MW, or If (1L377 is open ended at TAY only) AND (CP + BMW_MW + QTY_MW + MKL_MW) < 130 MW DTT 2L312 DTT all 138 kv shunt capacitors Load shedding sequence (ET3 will participate in load shed only when 1L377 is open ended at TAY): LS hasn t been met and (2L309 DKT + 2L312 SLS) < 10 MW, further apply load shed at feeders. If load shed requirement LS hasn t been met and (2L309 DKT + 2L312 SLS) 10 MW, go to Step two. Step two: DTT 2L312 first, this action is equivalent to load shed amount of (2L309 DKT + 2L312 SLS), then apply Gen shedding sequence: (1) QTY, (2) MKL CPrating = 127 for summer season; CPrating = 136 for winter season. GCPrating = 105 for summer season; GCPrating = 113 for winter season. Load shedding amount: LS = (2L312 SNK + 1L361 GMS) 1L361_Over_Rating MW Load shedding sequence (ET3 will participate in load shed only when 1L377 is open ended at TAY): (1) SRN, KIS, or E15; (2) E42, BPN, or ET3; (3) feeders. DTT all on line SGB 230 kv shunt capacitors if SRN is shed. DTT all on line BMT 138 kv shunt capacitors if all of KIS, E15, and E42 are shed. DTT one BMT 138 kv shunt capacitor if all the following conditions are met: (1) there are two BMT 138 kv shunt capacitors on line in service; (2) KIS and/or E15 are shed, and total load shedding amount is more than 50 MW; (3) E42 is not shed. Keep at most four 25 kv / 138 kv shunt capacitors on line post contingency. Dawson Creek/Groundbirch area is islanded and no load shedding is required. Dawson Creek/Groundbirch area is islanded and no load shedding is required. Same as Table L329 OOS Dawson Creek/Groundbirch area is islanded and no load shedding is required. No shedding is required. DTT one 138 kv shunt cap if more than 3 are online KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. If BMW_MW + QTY_MW + MKL_MW + DKW_MW is more than 90% of total MW capacity, under the light load conditions and high ambient temperature, 2L308 might be overloaded, which requires manual action by the system operator No shedding is required. DTT one 138 kv shunt cap if more than 3 are online KIS, E15, and SRN might partially trip by their under-voltage protection due to stalled induction motors. Under this condition, the remaining customer feeders may experience high voltages which should be controlled by the customer. If BMW_MW + QTY_MW + MKL_MW + DKW_MW is more than 90% of total MW capacity, under the light load conditions and high ambient temperature, 2L308 might be overloaded, which requires manual action by the system operator.