Reliability Coordinator Procedure

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Table f Cntents Purpse... 2 1. Respnsibilities... 2 2. Scpe/Applicability... 2 2.1 Backgrund... 2 2.2. Scpe/Applicability... 2 3. Prcedure Detail... 3 3.1. Overall Crdinatin and Cmmunicatin... 3 3.2. RC Respnsibilities... 3 3.3. TOP Respnsibilities... 4 3.4. BA Respnsibilities... 5 3.5. RC Restratin Objectives... 6 3.6. RC Restratin Strategies... 6 3.7. System Restratin Scenaris...10 3.7.1. Whle r Partial Transmissin System Islanding...10 3.7.2. Blackut Restratin using Cnnectin t an Energized System...12 3.7.3. Blackstart Restratin Energizing a De-energized System...13 3.8. Pst-Restratin: Returning t Nrmal Operatins...15 3.9. TOP System Restratin Review...16 4. Supprting Infrmatin...17 Operatinally Affected Parties...17 References...17 Definitins...18 Versin Histry...18 5. Peridic Review Prcedure...19 Review Criteria & Incrpratin f Changes...19 Frequency...19 Distributin...19 Appendix...19

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Purpse Ensure that plans are established t enable effective crdinatin f the System restratin prcess, t maintain reliability during restratin, and t place pririty n restring the Intercnnectin. 1. Respnsibilities Reliability Crdinatr Operatr Transmissin Operatrs Balancing Authrities 2. Scpe/Applicability 2.1 Backgrund This was develped t establish the prtcls that will be implemented t crdinate system restratin activities fllwing a majr system Disturbance 1. System restratin shuld prgress thrugh an rderly sequence f steps and cmmunicatins with impacted Transmissin Operatrs (TOPs), Balancing Authrities (BAs), and neighbring Reliability Crdinatrs (RCs), in rder t facilitate the restratin f the RC Area and the Intercnnectin. 2.2. Scpe/Applicability Fllwing a Disturbance in which ne r mre areas within the CAISO RC Area becme islated r blacked ut, the CAISO RC System Operatrs will implement the CAISO RC restratin plan. The scpe f the CAISO RC s restratin plan starts when either: 1. Blackstart Resurces are utilized t re-energize a shutdwn area f the Bulk Electric System (BES), r 2. Adjacent tie lines are utilized t re-energize a shutdwn area f the BES, r 3. Separatin has ccurred between neighbring RCs, r 4. An energized island has been frmed n the BES within the CAISO RC Area. The scpe f the CAISO RC s Restratin ends when all the TOPs in the CAISO RC Area are intercnnected, and the CAISO RC Area is intercnnected t all f its neighbring RC Areas. 2 The CAISO RC criteria fr a TOP t transfer peratins and authrity back t its BA 3 includes: 1. The TOP s restratin bjectives have been met and, 2. The TOP s BA(s) have the ability t perfrm generatin and demand balancing. 1 EOP-006-3R1 2 EOP-006-3R1 3 EOP-006-3 R1.6

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Entities that perate as a cmbined BA/TOP may nt need t suspend the BA functin during system restratin activities. In these cases, the entity shall ntify the RC Operatr when the TOP restratin bjectives have been met and nrmal generatin and demand balancing can resume. When returning t nrmal peratins, the gals fr all BAs shuld include resuming nrmal Interchange activities. Nte: Cntrlled lcal area islanding with an existing perating plan is exempt frm plan activatin. 3. Prcedure Detail 3.1. Overall Crdinatin and Cmmunicatin The RC Operatr implements its plan by crdinating the actins f the BAs and TOPs ver a wide area. The wide-area view f the CAISO RC Area and the Western Intercnnectin gives the RC Operatr the visibility t analyze the extent f the disturbance r event. Fllwing a majr Disturbance, the CAISO RC will crdinate with impacted entities t determine the best way t stabilize the remaining prtin f the CAISO RC Area and the Western Intercnnectin, in rder t efficiently restre and resynchrnize any islands that may have been frmed during the Disturbance, with the verall gal f restring the integrity f the Intercnnectin. Implementatin f each TOP s restratin plan, in crdinatin with the RC Operatr, will ensure the necessary crdinatin between impacted entities and will help t enable the expeditius restratin f the BES. If the TOP s restratin plan cannt be implemented as expected because actual system cnditins are different frm studied cnditins, the RC Operatr shall use the RC restratin plan strategies, in crdinatin with the impacted entity s restratin pririties, t implement alternative actins fr achieving system restratin. The RC Operatr shall crdinate restratin activities, mnitr restratin prgress and crdinate any needed assistance until nrmal peratins are resumed. The RC Operatrs, TOPs, BAs and GOPs will fllw established prtcls using three-part cmmunicatins fr all Operating Instructins. 4 3.2. RC Respnsibilities The RC Operatr has the verall crdinating rle during system restratin, t ensure that reliability f the BES is maintained during restratin, and that restring the CAISO RC Area and impacted areas within the Western Intercnnectin has the highest pririty. The RC Operatr will cnsider the impacted area(s) t be in an peratinal emergency cnditin when any CAISO RC Area TOP has implemented their system restratin plan(s). The RC Operatr is the primary cntact fr disseminating infrmatin regarding restratin activities t neighbring RCs, and t TOPs and BAs within CAISO RC Area. 5 RC Operatrs will be assigned t crdinate restratin activities fr the affected area(s). Once the RC Operatr is aware that the RC restratin plan may need t be implemented, the RC Operatr will ntify all BAs and TOPs f the initial system cnditins, t the extent 4 COM-002-4 R5 and R6 5 EOP-006-3 R1.4, 1.5, 1.6

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne knwn. The RC Operatr will establish and maintain active cmmunicatins between the RC and the TOPs and BAs regarding the status f the restratin effrt, by using RC cnference calls and the BA/TOP Messaging Tl. The RC Operatr will request peridic updates thrughut the restratin prcess and/r will establish mutually agreed-upn times when next cmmunicatins shuld ccur. The RC Operatr will keep neighbring RCs infrmed f the current restratin effrts via the Reliability Crdinatr Infrmatin System (RCIS) and the NERC Reliability Crdinatr Htline. 6 The RC Operatr will wrk with CAISO Emergency Respnse supprt persnnel t crdinate reprting t regulatry agencies and gvernment agencies as applicable. 7 The RC Operatr will cmmunicate, crdinate and issue Operating Instructins directly t the TOPs and BAs. RC Operatrs, in crdinatin with RC Operatins Engineers, will supprt TOPs and BAs by perfrming engineering studies as needed. 3.3. TOP Respnsibilities Each TOP within the CAISO RC Area shall have a Restratin t re-establish its electric system in a stable and rderly manner in the event f a partial r ttal system shutdwn. This sectin summarizes cmmunicatin, crdinatin and reprting requirements fr the TOPs 8. TOPs will: Implement their restratin plans in crdinatin with the CAISO RC. If a TOP is unable t implement its wn Restratin, then it will fllw restratin strategies which shuld be cnsistent with the CAISO RC Strategies t Assess, Stabilize, Restre and Resynchrnize. Make an effrt t cntact RC Operatr t btain system status and crdinate implementatin f their respective restratin plan. Cmmunicate if any autmatic lad shedding relays were triggered. Crdinate with their BA(s), if applicable, t determine if the BA functin needs t be suspended. Fr example: If the BA is unable t perate AGC due t inadequate frequency surces, If insufficient generatin remained nline fllwing an event, If the BA is unable t schedule Interchange, If the cde f cnduct needs t be suspended s the TOP can direct generatin resurces as needed, r If there was a cmplete system shutdwn and any ther situatin where the BA(s) have 6 EOP-006-3 R1.4 7 See EOP-004 and DOE OE-417 related prcedures fr details 8 EOP-006-3 R1.3

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne lst the ability t balance generatin and demand, and if the TOP needs t initiate frequency and vltage cntrl fr the impacted areas. Prvide peridic updates t the RC Operatr thrughut the restratin prcess and establish mutually agreed-upn times when next cmmunicatins shuld ccur. Cmmunicate with their BA(s) and GOPs t determine the status f the system and generating resurces. Cmply with Operating Instructins issued by an RC Operatr unless such actin cannt by physically implemented r wuld vilate safety, equipment, regulatry r statutry requirements. Cmmunicate and issue Operating Instructins t BAs, GOPs and DPs as needed. 9 Request permissin r pre-apprval frm the RC Operatr befre initially synchrnizing islands between adjacent TOPs r befre paralleling systems between adjacent RC areas. Ntify the RC Operatr befre synchrnizing a TOP island with lad greater than 500 MW within a single TOP area, unless preauthrized by the RC Operatr t prceed. As an ptin, can prvide current system cnditins and status updates, which are transmitted t email, t subscribed GO/ GOPs via the BA/TOP Messaging Tl. 3.4. BA Respnsibilities During system restratin activities, BAs ensure that any remaining energized prtin f the system, as well as energized islands and interties t the Intercnnectin, are stable. This sectin summarizes cmmunicatin, crdinatin and reprting requirements fr the BAs 10. BAs will: Crdinate, if applicable, with their TOP(s) t determine if the BA functin needs t be suspended. 11 Nte: This may nt be applicable t Entities that perate as a cmbined BA/TOP. Cmply with Operating Instructins issued by RC Operatr unless such actin cannt be physically implemented r wuld vilate safety, equipment, regulatry r statutry requirements. Cmmunicate and issue Operating instructins t TOPs, GOPs, and DPs as needed. 12 Crdinate with TOPs, GOPs, and DPs, as needed, t determine the status f the system and generatin and ntify the RC f the status. These activities may include but aren t limited t: Determining status f nline and ffline generatin, Determining status f transmissin and generatin facilities with scheduled utages in prgress, Evaluating prper AGC cntrl mde, 9 TOP-001-4 R1 and R3 10 EOP-006-3 R1.3 11 EOP-006-3 R1.6 12 TOP-001-4 R2 and R4

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Evaluating frequency surces, and Determining reserve requirements and availability: Managing Interchange schedules (i.e. curtailing t zer MW n pen ties), Cmmunicating with gas cmpanies, and Managing changes t lad frecasts. As an ptin, can prvide current system cnditins and status updates, which are transmitted t email, t subscribed GO/ GOPs via the BA/TOP Messaging Tl. 3.5. RC Restratin Objectives The primary gal f the CAISO RC System Restratin is t safely restre the integrity f the Western Intercnnectin as efficiently as pssible. Within the CAISO RC, restratin bjectives include: Restratin f ff-site pwer t nuclear pwer plants, Intercnnectin f all TOPs within the CAISO RC Area, Transfer f authrity frm each TOP back t its respective BA, and Cnnectin f the CAISO RC Area t all neighbring RC Areas. 3.6. RC Restratin Strategies Fllwing a majr Disturbance, the CAISO RC Area may be ttally r partially shut dwn, may cntain islated electrical islands cnsisting f lad and generatin, r may be separated frm an adjacent RC Area. Under these cnditins, the RC Operatr expects that TOPs and BAs will take immediate actin t stabilize their systems. The RC Operatr shall cmplete an initial assessment t determine whether the CAISO RC Restratin shuld be implemented. If implementing the Restratin, the restratin strategies 13 belw will be fllwed: Initial Assessment and Analysis, Stabilizatin, Restratin, Resynchrnizatin and Restratin f the Intercnnectin, and Return t nrmal peratins. 13 EOP-006-3 R1.1

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne The high level prcess t fllw after an event ccurs can be summarized in the fllwing criteria and actins: Reliability Crdinatr Actins Nte: The fllwing prcess includes criteria thrughut each stage f the restratin prcess fr sharing infrmatin regarding restratin with neighbring RCs and with TOPs and BAs within the RC Area. 14 Initial Assessment and Analysis Review system cnditins immediately fllwing the disturbance. Cnduct a detailed assessment f the CAISO RC Area t determine system cnditins and extent f the utage(s): Determine if electrical islanding has ccurred and if s, identify the existing islands and their respective bundaries. Determine if a prtin f the CAISO RC Area has been shut dwn and if it can be restarted frm an energized part f the system; r if cranking paths are available and Blackstart resurces can be used. Identify BAs and TOPs impacted by the disturbance and determine which TOPs must initiate their restratin plans t restre shut-dwn areas t service r t resynchrnize energized islands. Determine the status f transmissin and generatin facilities. Determine status f system, including unavailable transmissin facilities which cannt be returned t service in the near term, and impacts t lcal lad lss. Determine status f critical lads, such as nuclear generating statins and strage facilities, and as identified by the BAs and TOPs. Determine status f cmmunicatins systems identify any issues such as cell twers, RTUs, r ther systems which the RC, TOPs and BAs require fr interpersnal cmmunicatins and visibility. Determine status f RAS, UFLS and ther relay activatins. Determine status f ties and neighbring RC areas. Identify vltage levels and frequency; and Cnsider ther factrs which culd impact restratin effrts, such as extreme weather, natural disasters, cyber security incident(s), r civil unrest. Gather infrmatin t help determine cause f the Disturbance. Cnduct an assessment f adjacent BA, TOP and RC areas t determine system cnditins. Cmmunicate with all BAs, TOPs and RCs t ensure situatinal awareness. 14 EOP-006-3 R1.4

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Stabilizatin Reliability Crdinatr Actins Crdinate with BAs, TOPs and adjacent RCs t decide hw best t apprach restring the system, based n system cnditins. Cmmunicate reginal strategies and pririties fr restratin within its ftprint. Crdinate with TOPs t ensure their actins will help stabilize the system Determine actins necessary t stabilize and maintain reliable peratins f the CAISO RC Area and/r f existing electrical islands. Ensure nline generatin and lad are balanced t perate within established limits. Crdinate with TOPs t stabilize generatrs and maintain frequency in the range f at least 59.5 Hz t 60.5 Hz. Crdinate the identificatin f elements that are exceeding SOL limits, and crdinate adjustments. Crdinate with adjacent TOPs and BAs within the CAISO RC Area t ensure surrunding areas are taking actins t help stabilize and keep the remaining energized system intact. Crdinate t ensure apprpriate levels f perating reserves are maintained Crdinate and apprve TOP requests t restre lad. Restratin Cnsider if lad restratin is needed fr frequency and vltage cntrl. Otherwise, lad restratin is nt a pririty at this stage. Adjust, recnfirm and cmmunicate reginal restratin pririties fr the RC Area and Intercnnectin. Crdinate with impacted TOPs t identify and track restratin bjectives and gals. Crdinate with TOPs t ensure they are able t implement their plans, which shuld include, but aren t limited t: Prvide ff-site pwer requirements t nuclear pwer plants, as applicable; Use Blackstart Resurces as required t restre shut-dwn areas t service, with primary fcus n prviding start-up pwer t available generating units and restring substatin statin service; and Restre critical lads in accrdance with TOP pririties. Crdinate with adjacent TOPs and BAs t determine if resurces are available t assist with restratin effrt. Perfrm and/r validate TOP s studies as needed, in crdinatin with RC Operatins Engineer. Mnitr system island vltage and frequency. Nte: Sme islands will be energized r perated at a reduced vltage due t

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne transient ver-vltage cncerns. Reliability Crdinatr Actins Adjust, recnfirm and cmmunicate reginal restratin pririties, as needed, fr the RC Area and Intercnnectin. Resynchrnize and Restre Intercnnectin Determine when it is apprpriate t synchrnize electrical islands and re-establish intercnnectins between TOPs within CAISO RC Area and with neighbring RCs. 15 Determine if, nce cmbined, the resulting island will be capable f sustaining all credible cntingencies (i.e., perating in an N-1 secure state). Ensure the TOPs have agreed t key perating parameters prir t prceeding: Allwable frequency differences between the islands t be synchrnized, Allwable vltage phase angle differences between the islands t be synchrnized, Allwable vltage magnitude differences between the islands t be synchrnized, Which island will primarily be respnsible fr frequency regulatin (i.e. which island will utilize a generatr(s) with 0% gvernr drp r which island will have AGC in service), and Acceptable transfer limits and expected Interchange with the TOPs and BAs. Apprve, cmmunicate and crdinate the re-synchrnizatin f system islands, and/r synchrnizing pints, s as nt t cause a burden n adjacent TOPs, BAs, r RCs. Crdinate with TOPs t determine lad pick-up limitatin pst cnnectin. Crdinate with neighbring RCs t intercnnect RC Areas. Ntify all BAs and TOPs in the RC Area, and neighbring RCs, nce synchrnizatin has been accmplished. Crdinate lad restratin with the affected BAs and TOPs. Return t Nrmal Operatins Declare and send ut ntificatin f return t nrmal peratins, nce the RC has achieved all bjectives. Declare system emergency, r issue apprpriate Energy Emergency Alert (EEA) as needed fr any area still experiencing emergency cnditin - refer t RC44xx System Emergencies. The RC peratr may elect t declare N Tuch n specific TOP areas adjacent t TOP area that are still experiencing an emergency cnditin. 15 EOP-006-3 R1.2, 1.4

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne 3.7. System Restratin Scenaris The RC Operatr is respnsible fr the verall crdinatin f the system restratin, and shall identify the extent f the utages and impacted areas and ntify all entities. The RC Operatr will crdinate with the TOPs t maintain the energized prtin f the transmissin system within established line ladings, vltages and first cntingency prtectins. Several restratin scenaris are detailed belw with actins and cnsideratins fr the RC and TOP peratrs: Whle r partial transmissin system islanding, Blackut Restratin using cnnectin t an energized system, and Blackstart Restratin Energizing a De-energized System. Nte: The fllwing scenaris include criteria thrughut each stage f the restratin prcess fr sharing infrmatin regarding restratin with neighbring RCs and with TOPs and BAs within RC Area. 16 3.7.1. Whle r Partial Transmissin System Islanding Assumptins: Majr WECC RAS peratin, UFLS event, any ther cmbinatins f relay activatins, Multiple Islands exist that may have stabilized at a frequency ther than 60 Hz, and Majr transmissin paths are available, BA functins have nt been suspended. Pririties: Resynchrnizatin f electrical islands and restratin f the Intercnnectin. Reliability Crdinatr Actins Once the RC Operatr has determined that islanded cnditins exist within the RC Area, the RC Operatr will infrm all BAs and TOPs f the islanded cnditin. Perfrm initial assessment Assess initial cnditins, bundaries and relative strengths f islands. Determine if there are any vltage r stability cncerns, including identificatin f any actual exceedances f bth established limits and ptential Intercnnected Reliability Operating Limits (IROL) fr the current cnditins. Cnfirm which mde f AGC peratin (if any) each entity is using fr each island. Determine and adjust frequency cntrl surces t ensure RC, BAs and TOPs are mnitring the same data. Crdinate with impacted BAs t determine status f Operating and Cntingency Reserves t cnfirm deliverability. 16 EOP-006-3 R1.4

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Stabilizatin Reliability Crdinatr Actins Crdinate with BAs and TOPs t ensure each electrical islands are stable, with vltage and frequency within limits. Crdinate with adjacent BAs and TOPs within CAISO RC area and adjacent RC areas t analyze reliability impacts and ensure entities cnsider cutting schedules and adjusting limits, and are respnding t large ACE deviatins. Resynchrnizatin and Restratin f the Intercnnectin: Determine when it is apprpriate t synchrnize electrical islands and re-establish intercnnectins between TOPs within CAISO RC Area and with neighbring RCs. 17 Determine if, nce cmbined, the resulting island will be capable f sustaining all credible cntingencies (i.e., perating in an N-1 secure state) Ensure the TOPs have agreed t key perating parameters prir t prceeding: Allwable frequency differences between the islands t be synchrnized, Allwable vltage phase angle differences between the islands t be synchrnized, Allwable vltage magnitude differences between the islands t be synchrnized, and Which island will primarily be respnsible fr frequency regulatin (i.e. which island will utilize a generatr(s) with 0% gvernr drp r which island will have AGC in service). Verify acceptable transfer limits and expected Interchange with the TOPs and BAs. Apprve, cmmunicate and crdinate the re-synchrnizatin f system islands, and/r synchrnizing pints s as nt t cause a burden n adjacent TOPs, BAs, r RCs Crdinate lad restratin with the affected BAs and TOPs Crdinate with neighbring RCs t intercnnect RC Areas. Ntify all BAs and TOPs in the RC Area, and neighbring RCs, nce synchrnizatin has been accmplished. Return t Nrmal Operatins: Declare and send ut ntificatin f return t nrmal peratins nce all f the RC s bjectives have been achieved. Declare a System Emergency r issue apprpriate Energy Emergency Alert (EEA), as needed, fr any area still experiencing emergency cnditin refer t RC44XX System Emergencies. The RC Operatr may elect t declare N Tuch n specific TOP areas adjacent t the TOP area still experiencing an emergency cnditin. 17 EOP-006-3 R1.2, 1.4

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne 3.7.2. Blackut Restratin using Cnnectin t an Energized System Assumptins: One r mre TOPs in the CAISO RC Area have experienced a blackut cnditin. The restratin can be accmplished thrugh the cnnectin t anther energized system. Pririties: If nuclear generatin statins r strage facilities within the CAISO RC Area have lst access t ff-site pwer, the RC Operatr shall crdinate with the affected TOPs t give tp pririty t restratin f ff-site pwer t the affected nuclear statins. Use Blackstart Resurces as required t restre shut-dwn areas t service, with primary fcus n prviding start-up pwer t available generating units and restring statin service at critical substatins. Restre critical lads in accrdance with TOP pririties. Resynchrnize electrical islands and restre the Intercnnectin. Reliability Crdinatr Actins Once it s been determined that a prtin f the RC Area is shut dwn, the RC Operatr will infrm all BAs and TOPs f the shut-dwn area, and will request emergency assistance frm adjacent TOP, BA and RC areas. Perfrm initial assessment Stabilizatin Restratin Cnduct an assessment f adjacent BA, TOP and RC areas t determine system cnditins. RC Operatr will cmmunicate t all BAs, TOPs and RCs t ensure situatinal awareness. Crdinate with BAs and TOPs t discuss hw best t apprach restring the shutdwn area, based n system cnditins. RC Operatr shall cmmunicate reginal strategies within its ftprint, as well as pririties fr restratin, after crdinatin with adjacent RCs. Crdinate with adjacent BA and TOP areas t analyze reliability impacts remind entities t cnsider schedule cut, adjusting limits, large ACE deviatin, etc. Crdinate the identificatin f elements that are exceeding SOL limits and crdinate adjustments. Crdinate with adjacent TOPs and BAs t ensure surrunding areas are taking actins which help stabilize and keep remaining energized system intact. Ensure actins d nt adversely impact restratin effrts. Crdinate with BA and TOP areas adjacent t shut-dwn area, t evaluate pssibility f using energized Tie lines t meet restratin pririties, and if able, fllw RC pririties

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Paralleling and strategies. Reliability Crdinatr Actins Declare system emergencies fr energy and/r transmissin, as necessary, and crdinate with adjacent BAs and TOPs t call n additinal resurces t assist in restratin effrts. Mnitr tie line flws and ensure all elements are perating within established limits. Issue apprpriate Operating Instructin t adjacent BA and TOP areas. Ensure TOP fllws all restratin principles fr establishing and stabilizing an electrical island. Ensure restratin strategies are fllwed when TOPs deviate frm their plan. Crdinate with TOPs t parallel r synchrnize with adjacent systems. 18 Cmmunicate, crdinate and apprve the paralleling r re-synchrnizing f system, including paralleling and synchrnizing pints. Crdinate with Reliability Crdinatr Operatins Engineer t facilitate studies t determine clsing angles and ptential system impacts. Crdinate dispatch f generating resurces t reduce clsing angles, as needed t facilitate paralleling. If synchrnizing is required, refer t RC Prcedure attachment RC0460E Synchrnizatin Checklist. Return t Nrmal Operatins: Ntify all BAs and TOPs in the RC Area, and neighbring RCs nce paralleling has been accmplished. 19 Declare and send ut ntificatin f return t nrmal peratins nce all f the RC s bjectives have been achieved. Declare system emergency r issue apprpriate Energy Emergency Alert (EEA), as needed, fr any area still experiencing emergency cnditin - refer t RC44xx System emergencies. The RC peratr may elect t declare N Tuch n specific TOP areas adjacent t TOP area still experiencing an emergency cnditin. 3.7.3. Blackstart Restratin Energizing a De-energized System Assumptins: Restratin will use individual TOP Blackstart restratin plans in crdinatin with the RC Operatr. Blackstart generatrs and cranking paths have been identified in the TOP restratin plan. 18 EOP-006-3 R1.2 19 EOP-006-3 R1.4

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne TOPs can begin restratin activities that d nt affect the Intercnnectin. Pririties: Crdinate with TOPs t start islands with the mst direct paths t impacted nuclear plants and ther high pririty areas. If the nuclear plants have lst ff-site pwer, anticipate that TOPs will wrk t restre ffsite pwer as quickly as pssible. Reliability Crdinatr Actins Once it s been determined that the RC Area, r a prtin theref, is shut dwn, the RC Operatr will infrm all BAs and TOPs. Perfrm Initial Assessment Stabilizatin Restratin Crdinate with the TOPs and adjacent RCs t determine the bundaries f the shutdwn area and its effect n the Intercnnectin. Crdinate with the TOPs and adjacent RCs t assess initial cnditins and availability f blackstart resurces and cranking paths. Ensure BAs and TOPs understand rles and respnsibilities during the restratin prcess. Crdinate with TOPs and BAs t cnfirm system visibility and cntrl. Cmmunicate t BAs and TOPs that impacted entities are implementing their plans; and prvide an update regarding the wider area system status and energized areas. Crdinate with TOPs t cnfirm status f interties (i.e. pen breakers, busses, etc.). Mnitr established islands t ensure they are stable and are perating within acceptable vltage and frequency limitatins. Request peridic updates thrughut the restratin prcess and/r establish mutually agreed-upn times when next cmmunicatins shuld ccur. Cnference calls shuld include time zne fr call(s). Cnference calls may be established by area, as needed, fr different milestnes thrughut the restratin prcess. Crdinate with TOPs t determine status f blackstart restratin prcesses. Crdinate with TOPs t receive updates as restratin milestnes are achieved. Resynchrnizatin and Restratin f the Intercnnectin Determine when it is apprpriate t synchrnize electrical islands and re-establish intercnnectins between TOPs within CAISO RC Area and with neighbring RCs. 20 20 EOP-006-3 R1.2, 1.4

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Reliability Crdinatr Actins Determine if, nce cmbined, the resulting island will be capable f sustaining all credible cntingencies (i.e., perating in an N-1 secure state). Ensure the TOPs have agreed t key perating parameters befre prceeding: Allwable frequency differences between the islands t be synchrnized, Allwable vltage phase angle differences between the islands t be synchrnized, Allwable vltage magnitude differences between the islands t be synchrnized, and Which island will primarily be respnsible fr frequency regulatin (IE which island will utilize a generatr(s) with 0% gvernr drp r which island will have AGC in service). Apprve, cmmunicate and crdinate the re-synchrnizatin f system islands, and/r synchrnizing pints s as nt t cause a burden n adjacent TOPs, BAs, r RCs. Verify acceptable transfer limits and expected Interchange with the TOPs and BAs. Crdinate lad restratin with the affected BAs and TOPs. Crdinate with neighbring RCs t intercnnect RC Areas. Ntify all BAs and TOPs in the RC Area, and neighbring RCs, nce synchrnizatin has been accmplished. 21 Crdinate lad restratin with the affected BAs and TOPs. Return t Nrmal Operatins Ntify all BAs and TOPs in the RC Area, and neighbring RCs nce paralleling has been accmplished. Declare and send ut ntificatin f return t nrmal peratins nce all f the RC s bjectives have been achieved. Declare system emergency r issue apprpriate Energy Emergency Alert (EEA), as needed, fr any area still experiencing emergency cnditin - refer t RC44xx System Emergencies. The RC peratr may elect t declare N Tuch n specific TOP areas adjacent t TOP area still experiencing an emergency cnditin. 3.8. Pst-Restratin: Returning t Nrmal Operatins Assumptins: All CAISO RC Area TOPs that have the capability t be intercnnected are intercnnected and perating synchrnusly. The RC Operatr has verified that the CAISO RC Area BES is in a stable state. 21 EOP-006-3 R1.4

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne The RC Operatr has verified with all CAISO RC Area BAs and TOPs that they are ready t return t nrmal peratins. The RC Operatr has verified the status f neighbring RC Areas, and has cnfirmed that thse entities are ready t return t nrmal peratins mde with RC Area perating entities. Actual BES line flws and cntingency analysis results shuld indicate that the BES is perating within applicable System Operating Limits (SOLs) and Intercnnected Reliability Operating Limits (IROLs). TOPs have transferred peratins and authrity back t their respective BAs 22. Reliability Crdinatr Actins Cmmunicate with all CAISO RC Area BAs and TOPs (r their designated agent) and verify the status f their systems and readiness t return t nrmal peratins. Cntact adjacent RCs t verify that they are ready t resume nrmal peratins with the CAISO RC Area s perating entities. Issue a message via the BA/TOP Messaging Tl and RCIS messaging systems annuncing a return t nrmal peratins. 3.9. TOP System Restratin Review Each TOP within the CAISO RC Area shall have a Restratin t re-establish its electric system in a stable and rderly manner in the event f a partial r ttal shutdwn f its system. The CAISO RC shall review the System Restratin s fr TOPs within its Reliability Crdinatr Area 23. The CAISO Operatins Cmpliance team shall wrk in cnjunctin with the RC t facilitate reviews f the System Restratin s submitted by TOPs. The CAISO RC shall wrk with each TOP t develp a mutually-agreed, predetermined annual review schedule. 24 If the TOP needs t mdify the annual schedule r submit a change between annual reviews, they shall cntact peratinscmpliance@cais.cm. Each TOP shall submit its revised Restratin t CAISO RC fr apprval, when the revisin wuld change its ability t implement its Restratin, as fllws 25 : Within 90 calendar days after identifying any unplanned permanent BES mdificatins, r Prir t implementing a planned permanent BES mdificatin subject t its Reliability Crdinatr apprval requirements per EOP-006. The CAISO RC shall prvide a secure website where TOPs may uplad System Restratin s fr RC review. The TOPs shall uplad/email the dcument(s) with a cmpleted RC Prcedure attachment RC0460F EOP-005 Review Checklist. 22 EOP-006-3 R1.6 23 EOP-006-3 R5 24 EOP-005-3 R3 25 EOP-005-3 R4, 4.1, 4.2

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Within 30 calendar days f receipt 26, the CAISO RC shall: Review each submitted Restratin n the basis f cmpatibility and interdependency with ther TOPs restratin plans, Review each plan t ensure cnsistency with the RC s restratin plan, Review each plan t ensure cnsistency with the requirements in EOP-005-3, and Ntify each submitting TOP f the results f its review, specifying any time frame fr resubmittal f its restratin plan if revisins are identified. Each TOP shall address any reliability risks identified by the CAISO RC and resubmit its Restratin t CAISO RC within the specified time perid. CAISO RC will pst an apprval letter t the secure site upn cmpletin f the review prcess, and ntify the submitting TOP entity. 4. Supprting Infrmatin Operatinally Affected Parties Shared with Public. References NERC Requirements Prcedure References EOP-006-3 EOP-005-3 TOP-001-4 R1, R3 TOP-001-4 R2, R4 COM-002-4 R5, R6 CAISO RC0130 - Ntificatin Requirements fr Real-Time Events CAISO RC0330 - Crdinatin with Neighbring RCs CAISO RC0410 - System Emergencies CAISO RC0420 - Event Reprting CAISO RC9000 - Open Lp Guideline 26 EOP-006-3 R5.1

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne Definitins The fllwing terms capitalized in this Operating Prcedure are in accrdance with the NERC Glssary, and/r therwise when used are as defined belw: Term Disturbance Blackstart Resurces Descriptin 1. An unplanned event that prduces an abnrmal system cnditin. 2. Any perturbatin t the electric system. 3. The unexpected change in ACE that is caused by the sudden failure f generatin r interruptin f lad. A generating unit(s) and its assciated set f equipment which has the ability t be started withut supprt frm the System r is designed t remain energized withut cnnectin t the remainder f the System, with the ability t energize a bus, meeting the Transmissin Operatr s restratin plan needs fr Real and Reactive Pwer capability, frequency and vltage cntrl, and that has been included in the Transmissin Operatr s restratin plan. Versin Histry Versin Change Date 1.0 Apprved by Steering Cmmittee. 10/16/18

Crdinatr Prcedure Reliability Crdinatr Area Restratin Prcedure N. RC0460 Versin N. 1.0 Distributin Restrictin: Nne 5. Peridic Review Prcedure Review Criteria & Incrpratin f Changes Reviewer shall ensure that the prcedure is cnsistent with the requirements in EOP-006-3. Due t the nature f the cntent in the Appendices, the CAISO RC may incrprate changes int the affected attachments as needed in rder t be cnsistent with the TOP s. These attachments may be re-published withut reissuing the parent RC0460 Reliability Crdinatr Area Restratin dcument. This plan shall be reviewed by neighbring Reliability Crdinatrs. Each neighbring RC shall have 60 days t review and prvide written ntificatin f any cnflicts discvered during that review t peratinscmpliance@cais.cm. 27 If either RC finds cnflicts between its restratin plans and any f its neighbrs, the cnflicts shall be reslved within 30 calendar days f receipt f written ntificatin. 28 Frequency This plan shall be reviewed within 13 calendar mnths f the last review. 29 Distributin At a minimum, the plan shall be distributed t each f the CAISO TOPs, BAs and neighbring RCs within 30 calendar days f creatin r revisin. 30 Prir t the effective date f this plan, the CAISO RC shall have a cpy f its latest restratin plan and cpies f the latest apprved restratin plan f each TOP in its RC Area available t its RC Operatrs within bth cntrl rms in Flsm and Lincln. 31 Appendix RC0460A Restratin Principles RC0460B Whle r Partial Transmissin System Islanding Checklist RC0460C Blackut Restratin Using Cnnectin t Energized System Checklist RC0460D Blackut Restratin Energizing a De-energized System Checklist RC0460E Synchrnizing Checklist RC0460F EOP-005 Review Checklist 27 EOP-006-3 R4 28 EOP-006-3 R4.1 29 EOP-006-3 R3 30 EOP-006-3 R2 31 EOP-006-3 R6