Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2020-10-31

The table below contains the significant transmission outages submitted as tentative to the AESO.
These Outages have not yet necessarily been approved, but are listed for awareness and coordination purposes.
An Outage has been considered significant for this table if it meets any one (1) or more of the following criteria:
  1. it affects a transmission facility operating at two hundred and forty (240) kV or greater;
  2. it affects an intertie;
  3. it affects an element connecting facilities owned by two (2) or more different legal owners of transmission facilities;
  4. it affects an element that connects a generating unit or an aggregated generating facility to the interconnected electric system;
  5. it requires the ISO to issue a dispatch or directive for generation in order to facilitate the planned outage;
  6. it affects a cutplane limit;
  7. it limits or reduces the operability of a synchronous condenser, static VAr compensator, static compensator or other similar dynamic device; or
  8. it affects high voltage direct current facilities.
Note: Where a transmission outage requires generation curtailments, the adjustments to generation will typically happen in the hours before the scheduled transmission outage and in the hour after the element is returned to service.

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Owner From To Duration Element Scheduled Activity Affected Intertie
ATCO 24-Jan-20 08:00 30-Nov-20 16:00 311.33 Days
Continuous		 2029s ACF13 (2029s Heathfield) forced outage repairs  
EPCOR 31-Aug-20 07:00 16-Nov-20 07:59 77.08 Days
Continuous		 805s C1 (805s Jasper) forced  
ALTALINK 05-Oct-20 00:01 22-Nov-20 22:00 48.96 Days
Continuous		 62s 12 (62s Brazeau) turnaround  
EPCOR 19-Oct-20 07:00 31-Dec-20 17:00 73.46 Days
Continuous		 814s T1 (814s Bellamy), 814s B2401 (814s Bellamy), 814s B2407 (814s Bellamy) regasketing work  
ATCO 26-Oct-20 07:00 08-Nov-20 17:30 13.48 Days
Continuous		 13L50 (2029s Heathfield - 2075s Newell) EATL outage

 
EPCOR 26-Oct-20 07:00 13-Nov-20 17:00 18.46 Days
Continuous		 665s T3 (665s Dome) cut in and energization of new 72DS26 line (P1659)  
ATCO 26-Oct-20 08:00 08-Nov-20 16:00 13.38 Days
Continuous		 9L36 (825s Whitefish Lake - 826s Marguerite Lake) upgrade P&C  
ALTALINK 26-Oct-20 08:03 05-Nov-20 17:00 10.41 Days
Continuous		 39s T2 (39s Bickerdike) fix leak repairs and counter repairs, replace oil  
ATCO 26-Oct-20 10:00 02-Nov-20 15:00 7.25 Days
Continuous		 7L20 (740s H.R.Milner - 810s Dome Cutbank) replacement of under rated and rotten crossarms  
Syncrude 31-Oct-20 08:00 02-Nov-20 20:00 2.54 Days
Continuous		 Significant Outage - D05 Substation 260KV Outage - Tie Breaker (512 PM) Following Circuit Breakers will be operated: - 512 Following MOD's will be operated: - 512A, 512B Significant Outage - D05 Substation 260KV Outage - Tie Breaker (512PM).

Following Circuit Breakers will be operated:
- 512

Following MOD's will be operated:
- 512A, 512B		  
EPCOR 02-Nov-20 07:00 03-Nov-20 17:00 1.42 Days
Continuous		 Genesee S/S 1238L Bay outage Cutover of new DFR @ Genesee S/S  
EPCOR 02-Nov-20 07:00 06-Nov-20 17:00 4.42 Days
Continuous		 TX1 Zone @ Riverview Riser Repair and Commissioning  
ENMAX 02-Nov-20 08:00 04-Nov-20 16:00 2.33 Days
Continuous		 162.1TR RTU & Line Protection Upgrade. Settings changes.  
ENMAX 02-Nov-20 08:00 05-Dec-20 16:00 33.33 Days
Continuous		 162.81L Line Protection Upgrade.  
ALTALINK 02-Nov-20 08:45 05-Nov-20 15:45 3.29 Days
Continuous		 914L (87s - 63s) Advice SCADA upgrade  
BCH 02-Nov-20 09:00 04-Nov-20 17:00 2.33 Days
Continuous		 5L92 (Cranbrook - Selkirk) insulator replacement AB-BC
EPCOR 02-Nov-20 09:30 06-Nov-20 14:00 4.19 Days
Continuous		 1058L Line Maintenance/Upgrades  
ALTALINK 02-Nov-20 09:30 13-Nov-20 14:00 11.19 Days
Continuous		 17s13 - GOI Replace 17s13 Breaker To New SF6 Type  
ATCO 02-Nov-20 10:00 05-Nov-20 15:00 3.21 Days
Continuous		 7L70 7L70 Crossarm replacements  
Syncrude 03-Nov-20 07:00 06-Nov-20 20:00 3.54 Days
Continuous		 Significant Outage: AL-1, 260kV Power Line Following Circuit Breakers will be operated: 517, 519 (D05 Sub.) 211, 213 (G01 Sub.) Following MOD's will be operated: 517A, 517B, 519A, 519B, 520, (D05 Sub.) 211A, 212B, 213A, 213B, 215 (G01 Sub.) Tie-Ins for various infrastructure system.

Following Circuit Breakers will be operated:
517, 519 (D05 Sub.)
211, 213 (G01 Sub.)

Following MOD's will be operated:
517A, 517B, 519A, 519B, 520, (D05 Sub.)
211A, 212B, 213A, 213B, 215 (G01 Sub.)		  
ALTALINK 03-Nov-20 07:15 04-Nov-20 17:45 1.44 Days
Continuous		 1041L (370s - 554s) GOI -Install phase raiser assemblies 1041L Str 208 bottom phase for line clearance mitigation.  
ALTALINK 03-Nov-20 08:00 03-Nov-20 16:00 8 Hours
Daily		 728L, 788L, 157s T1 & 138kV Bus 1 - GOI Repairing 157s19  
ALTALINK 03-Nov-20 10:00 03-Nov-20 11:00 60 Mins
Daily		 396s412 Breaker open Upgrade 396s MPLS node. Loss of 412L TPR requires 412L to be open due to system stability. Coordinated with 322s outage at same time. AB-BC
BCH 03-Nov-20 17:30 03-Nov-20 22:00 4.5 Hours
Continuous		 1L274 (Elkford Tap - Elkford), 1L274 (EFT - 1D2L274) bypass removal AB-BC
EPCOR 04-Nov-20 07:00 05-Nov-20 17:00 1.42 Days
Continuous		 Genesee S/S 1239L bay outage Cutover of new DFR @ Genesee S/S  
ALTALINK 04-Nov-20 07:00 06-Nov-20 18:00 2.46 Days
Continuous		 1046L (338s-310p) - GOI Components Str's Range 1-121  
ENMAX 04-Nov-20 08:00 05-Nov-20 18:00 1.42 Days
Continuous		 25s. 25B240-D131. 25B240-D134. 25B240-D140. 25PT240-Z41 240kV Bus HV SW maint SW145, SW149. Replace switch mech SW131, SW137. SW 145 at 25 sub - stiff to operate. Original outage Oct 21-22  
ALTALINK 05-Nov-20 07:00 06-Nov-20 18:00 1.46 Days
Continuous		 951L (275s - 132s) GOI Urgent replacement of one 240 kV CVT (275s24) due to oil leak. 2nd Scope: P5 Urgent Conductor Repair between 951L41 & 951L42 D/C 944L  
ALTALINK 05-Nov-20 07:15 12-Nov-20 17:45 7.44 Days
Continuous		 918L (281s - C162s) GOI Scope of work includes maintenance on structures 764 - 842. RB on 771L for shared towers  
ENMAX 05-Nov-20 08:00 07-Nov-20 16:00 2.33 Days
Continuous		 918L RTU & Line Protection Upgrade. Settings changes. Altalink sharing outage until Nov 12th  
EPCOR 06-Nov-20 07:00 06-Nov-20 17:00 10 Hours
Continuous		 Genesee S/S 12TC1/12BU1 bay outage Cutover of new DFR @ Genesee S/S  
ALTALINK 06-Nov-20 07:15 09-Nov-20 17:45 3.44 Days
Continuous		 3L (42s - 272s) GOI Structure Replacement (Str 392) due to lightning damage  
Syncrude 07-Nov-20 08:00 08-Nov-20 20:00 1.5 Days
Continuous		 Significant Outage: 260KV 5 Yr PM for RL-1 Following Circuit Breakers will be operated: 516, 517 (D05 Sub.) 910, 911 (Ruth Lake Sub.) Following MOD's will be operated: 516B, 517B, 518 (D05 Sub.) 910B, 911B, RL-1D1 (Ruth Lake Sub.) Significant Outage:
260KV 5 Yr PM for RL-1

Following Circuit Breakers will be operated:
516, 517 (D05 Sub.)
910, 911 (Ruth Lake Sub.)

Following MOD's will be operated:
516B, 517B, 518 (D05 Sub.)
910B, 911B, RL-1D1 (Ruth Lake Sub.)		  
EPCOR 09-Nov-20 07:00 10-Nov-20 17:00 1.42 Days
Continuous		 Genesee S/S 1209L bay outage Cutover of new DFR @ Genesee S/S  
ALTALINK, Lethbridge 09-Nov-20 08:00 10-Nov-20 16:00 1.33 Days
Continuous		 824L (593s Lethbridge Lakeview - 618s Riverbend) maintenance on manual air breaks  
ATCO 09-Nov-20 08:00 12-Nov-20 16:00 3.33 Days
Continuous		 757S 912, 9L80, 757S 912T, 757S 707, 764S 701 757S - BKR 912 MIN OIL HPF COMPLETE TESTING, 912T OOS  
ATCO 09-Nov-20 08:00 23-Nov-20 16:00 14.33 Days
Continuous		 9L37 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade - Wiring and Commissioning		  
BCH 09-Nov-20 09:00 10-Nov-20 19:00 1.42 Days
Continuous		 5L96 (Selkirk - Vaseux Lake) insulator replacement, BC Maintenance does not affect the Alberta ATC AB-BC
EPCOR 09-Nov-20 09:30 13-Nov-20 14:00 4.19 Days
Continuous		 1059L Line Maintenance & Upgrades  
ALTALINK 09-Nov-20 10:00 10-Nov-20 16:30 30.5 Hours
Continuous		 310p T36(TX18001) GOI Move T36 tapchanger indication from old RTU to new RTU  
ATCO 09-Nov-20 10:00 15-Nov-20 15:00 6.21 Days
Continuous		 7L20 Replacement of under rated and rotten crossarms  
ALTALINK 09-Nov-20 11:00 12-Nov-20 18:00 3.29 Days
Continuous		 498s 138kV BUS 1 & T1(18853) GOI Complete install of new 138kV "B" Bus protection  
Syncrude 10-Nov-20 07:00 13-Nov-20 20:00 3.54 Days
Continuous		 Significant Outage: AL-2, 260kV Power Line Following Circuit Breakers will be operated: 511, 512, 519 (D05 Sub.) 222, 223 (G01 Sub.) Following MOD's will be operated: 511A, 511B, 512A, 512B, 514, 519A, 519B (D05 Sub.) 222A, 222B, 223A, 223B, 225 (G01 Sub.) Tie-Ins for various infrastructure system

Following Circuit Breakers will be operated:
511, 512, 519 (D05 Sub.)
222, 223 (G01 Sub.)

Following MOD's will be operated:
511A, 511B, 512A, 512B, 514, 519A, 519B (D05 Sub.)
222A, 222B, 223A, 223B, 225 (G01 Sub.)		  
ALTALINK 10-Nov-20 07:15 10-Nov-20 17:45 10.5 Hours
Daily		 786L (799s - B1s) GOI *P5 786L Urgent Repair structure 95  
ALTALINK 11-Nov-20 08:30 12-Nov-20 16:30 1.33 Days
Continuous		 310p T30 (TX18153) GOI Move T30 tapchanger indication from old RTU to new RTU  
EPCOR 12-Nov-20 07:00 12-Nov-20 17:00 10 Hours
Continuous		 Genesee S/S 430L bay outage Cutover of new DFR @ Genesee S/S  
EPCOR 13-Nov-20 07:00 13-Nov-20 17:00 10 Hours
Continuous		 Genesee S/S 12TC2/12BU2 bay outage Cutover of new DFR @ Genesee S/S  
ALTALINK 13-Nov-20 14:30 13-Nov-20 16:30 2 Hours
Daily		 17s995N (995L) - Advice 1.5 Hour outage to 995L (Open at 17s) is required in order to test energize new 17s13 Breaker via 17s12. ACC Issue 17s995N Advice then open 17s12 to Commission New 17s13 Breaker  
EPCOR 14-Nov-20 07:00 16-Nov-20 17:00 2.42 Days
Continuous		 72kv Bus 1 and CN10 @ Cloverbar & Namao Arrestor support replacement, Doble Testing  
Syncrude 14-Nov-20 08:00 15-Nov-20 20:00 1.5 Days
Continuous		 Significant Outage: 260KV, 5 Yr PM RL-2 Following Circuit Breakers will be operated: 512, 513 (D05 Sub.) 902, 907 (Ruth Lake Sub.) Following MOD's will be operated: 512B, 513B, 515 (D05 Sub.) 902A, 907A, RL-2D1 (Ruth Lake Sub.) Significant Outage:
260KV, 5 Yr PM RL-2
Following Circuit Breakers will be operated:
512, 513 (D05 Sub.)
902, 907 (Ruth Lake Sub.)

Following MOD's will be operated:
512B, 513B, 515 (D05 Sub.)
902A, 907A, RL-2D1 (Ruth Lake Sub.)		  
EPCOR 16-Nov-20 07:00 20-Nov-20 17:00 4.42 Days
Continuous		 TX2 Zone @ Riverview Switch and Riser Repair/Commissioning  
EPCOR 16-Nov-20 07:00 20-Nov-20 17:00 4.42 Days
Continuous		 TX1 @ Dome Transformer Calisto Repair  
ENMAX 16-Nov-20 08:00 17-Nov-20 16:00 1.33 Days
Continuous		 Altalink 5s T1 GIS Switch Maintenance 2MD88_88G, 2MD96_96G, 2MD112_112G, 2MD80_80G, 2MD81_81G, 2MD104_104G  
EPCOR 16-Nov-20 08:00 20-Nov-20 17:00 4.38 Days
Continuous		 J240C1 @ Jasper Cap Bank Repair/Replacement  
ENMAX 16-Nov-20 08:00 23-Nov-20 09:00 7.04 Days
Continuous		 65.1TR Online Monitoring Installation.  
ATCO 16-Nov-20 08:00 24-Nov-20 17:00 8.38 Days
Continuous		 790S 703T Protection upgrades  
BCH 16-Nov-20 09:00 18-Nov-20 17:00 2.33 Days
Continuous		 2L112 (Boundary - Nelway) BCH disconnect inspections, BC maintenance does not affect the Alberta ATC AB-BC
ALTALINK 16-Nov-20 09:30 20-Nov-20 17:00 4.31 Days
Continuous		 17s 240kV SBus 2 - GOI Replace 240B2 (south bus) strain insulators, replace 1ph bus CVT 17s191 Like for like  
ALTALINK 16-Nov-20 10:45 19-Nov-20 17:45 3.29 Days
Continuous		 266s FSC 2 GOI FAC501 yearly maintenance  
ALTALINK 17-Nov-20 07:15 22-Nov-20 17:45 5.44 Days
Continuous		 1036L (356s - 554s) GOI installation of Phase Raiser assemblies on structure 28, 29 and Interphase spacers on spans 27-30  
ALTALINK 17-Nov-20 07:45 17-Nov-20 17:00 9.25 Hours
Daily		 122s T1 (Tx 18552) - GOI Techs to investigate metering value issue - customer requested. This requires testing TX1 CT's and associated PT's.  
ATCO 17-Nov-20 08:00 19-Nov-20 16:00 2.33 Days
Continuous		 7L80 Setting poles for Mitigation work  
ATCO 17-Nov-20 08:00 25-Nov-20 17:00 8.38 Days
Continuous		 7L199 7L199 OOS for X-ARMS changes  
ENMAX 18-Nov-20 08:00 19-Nov-20 16:00 1.33 Days
Continuous		 Altalink 5s T2 GIS Switch Maintenance 2SW82G, 2MD113_113G, 2MD87_87G, 2MD111_111G, 2MD95_95G  
ENMAX 18-Nov-20 08:00 20-Nov-20 16:00 2.33 Days
Continuous		 932L RTU & Line Protection Upgrade. Settings changes.  
ALTALINK 18-Nov-20 15:00 18-Nov-20 19:00 4 Hours
Daily		 370s175 (172L) Advice Trip test 370s175 (Breaker 552) initiated by 370s770E (752) Breaker Fail Protection.  
ALTALINK 19-Nov-20 07:30 19-Nov-20 11:30 4 Hours
Daily		 370s207X (207L) Advice Trip test 370s207X (Breaker 652) initiated by 370s770E (752) Breaker Fail Protection.  
ALTALINK 19-Nov-20 09:00 19-Nov-20 11:00 2 Hours
Daily		 62s T5 (Tx 18580) - De-energized 62s T3 needs to be put into service to take load readings  
ENMAX 23-Nov-20 08:00 24-Nov-20 16:00 1.33 Days
Continuous		 833L GIS Minor Maintenance 2B138-D88, GIS Minor Maintenance - 2B138-D93, 2B138-D94, 2MD138-833L_833LG  
ATCO 23-Nov-20 09:00 23-Nov-20 17:00 8 Hours
Continuous		 790S 704 790S 704 Top up Low Sf6 / Investigate Leak

Top up low pole and check for leaks

 
ALTALINK 23-Nov-20 09:30 26-Nov-20 16:30 3.29 Days
Continuous		 255s33, 255s35 (255s34) Advice Outage on 255s34 to implement and test new RAS scheme. Line protection relays will be taken out of service at the same time.  
EPCOR 23-Nov-20 09:30 27-Nov-20 17:00 4.31 Days
Continuous		 1139L @ Riverview/Harry Smith Switch Repair/P&C wiring  
ALTALINK 23-Nov-20 09:45 23-Nov-20 15:45 6 Hours
Daily		 879L(244s - 368s) GOI investigate why motor mech isn't working on 244s879  
ALTALINK 23-Nov-20 10:00 28-Nov-20 11:30 5.06 Days
Continuous		 17s11 - GOI Replace 17s11 breaker fail and control module  
ATCO 23-Nov-20 10:00 30-Nov-20 15:00 7.21 Days
Continuous		 7L20 Replacement of under rated and rotten crossarms  
ALTALINK 23-Nov-20 11:30 26-Nov-20 18:00 3.27 Days
Continuous		 266s FSC 1 GOI Techs are required to perform PRC005 Maintenance on the following relays: FSC1 A7/50/51/60/64/81/86/96/FSC1 MVME41 FSC1 B7/50/51/60/64/81/86/96/FSC1 MVME41  
ALTALINK 24-Nov-20 07:00 26-Nov-20 14:45 2.32 Days
Continuous		 2s T1 (Tx18633) / 87L GOI 138kV VT Replacement, c 2nd Scope: 87L maintenance (str 6, 16)  
ALTALINK 24-Nov-20 07:15 25-Nov-20 17:45 1.44 Days
Continuous		 675L (244s - 321s) GOI Scope of work includes maintenance on str 150 and 153. Shared towers with 880L  
ALTALINK 24-Nov-20 07:30 26-Nov-20 18:00 2.44 Days
Continuous		 102s SVC GOI 102s SVC Cooling system issue - investigative 102s SVC Stop sequence and 7189 - investigate and correct logic issues with breakers 555, 252 and airbrake 7189 102sT4 transfix service alarm Stnd Mnt 00102s A87/T4 URT60 Tr(Tx Relay Maintenance) Stnd Mnt 00102s B87/T4 SEL387-5 Tr (Tx Relay Maintenance) Replace ABB HMI SVC Computers at site.  
ALTALINK 25-Nov-20 08:00 27-Nov-20 17:00 2.38 Days
Continuous		 69s 240kV Bus & 913L - GOI Scope of work includes replacing structure 142F, Both sections of 913L and 69s 240kV Bus needed due to proximity.  
ALTALINK 25-Nov-20 23:00 26-Nov-20 03:00 4 Hours
Continuous		 62s11 Advice for TransAlta maintenance  
ALTALINK 26-Nov-20 07:00 26-Nov-20 18:00 11 Hours
Daily		 1034L(324s - 244s) GOI scope of work includes maintenance strs 46 and 236 Require reclose block on 1035L  
ALTALINK 27-Nov-20 08:00 27-Nov-20 10:00 2 Hours
Continuous		 17s26 - Advice Trip test 17s6 from new s11 breaker fail  
ALTALINK 27-Nov-20 08:00 27-Nov-20 17:00 9 Hours
Daily		 1075L (28s - 132s) GOI Scope of work includes maintenance on structures 7 and 8.  
ALTALINK 27-Nov-20 10:00 27-Nov-20 12:00 2 Hours
Daily		 17s29 - Advice Trip test 17s7 from new s11 breaker fail  
ALTALINK 27-Nov-20 12:00 27-Nov-20 15:00 3 Hours
Daily		 17s31 - Advice Trip test 17s1 from new s11 breaker fail  
ALTALINK 27-Nov-20 15:00 27-Nov-20 18:00 3 Hours
Daily		 17s42 - Advice Trip test 17s10 from new s11 breaker fail  
ALTALINK 28-Nov-20 07:00 28-Nov-20 18:00 11 Hours
Daily		 931L (28s - 132s) GOI Scope of work includes maintenance on structure 7, also require a reclose block on 1075L.  
ALTALINK 28-Nov-20 08:00 28-Nov-20 11:00 3 Hours
Daily		 17s46 - Advice Trip test 17s2852 from new s11 breaker fail  
ALTALINK 28-Nov-20 08:00 29-Nov-20 18:00 1.42 Days
Continuous		 89s T1 & 240kV West Bus 1 - GOI 89s1 Switch Repair  
ALTALINK 28-Nov-20 12:00 28-Nov-20 15:00 3 Hours
Daily		 17s58 - Advice Trip test 17s12 from new s11 breaker fail  
EPCOR 30-Nov-20 07:00 30-Nov-20 17:00 10 Hours
Continuous		 TX1 @ Summerside E657S SU1T1 Breaker Maintenance and TX1 Tap Changer Maintenance  
EPCOR 30-Nov-20 07:00 30-Nov-20 17:00 10 Hours
Continuous		 B2402 @ Bellamy Breaker Maintenance  
EPCOR 30-Nov-20 07:00 04-Dec-20 17:00 4.42 Days
Continuous		 1164L @ Riverview/Petrolia Switch Repair/P&C Wiring  
ALTALINK 30-Nov-20 07:00 09-Dec-20 18:00 9.46 Days
Continuous		 909L (310p - E665s) - GOI Line clearance mitigation on Structures #51, 52, 80 & 81  
ALTALINK 30-Nov-20 07:30 03-Dec-20 17:30 3.42 Days
Continuous		 89s252 - GOI Replace CT252  
ALTALINK 30-Nov-20 08:00 11-Dec-20 16:00 11.33 Days
Continuous		 180L(15s - 928s) GOI Outage request to install new tap for new Substation 604s Granum. OPGW repairs required between structures 515-520 will occur concurrently.  
BCH 30-Nov-20 09:00 19-Dec-20 17:00 19.33 Days
Continuous		 1L274 (48s Pocaterra - Britt Creek) structure refurbishment AB-BC
EPCOR 01-Dec-20 07:00 01-Dec-20 17:00 10 Hours
Continuous		 TX2 @ Summerside E657S SU2T2 Breaker Maintenance  
ALTALINK 01-Dec-20 09:30 11-Dec-20 16:30 10.29 Days
Continuous		 15s179 and 15s181 (15s180N) Advice Outage on 15s180N to implement and test new RAS scheme. Line protection relays will be taken out of service at the same time. Co- ordinated with 180L line outage with Valard.  
ALTALINK 02-Dec-20 07:15 03-Dec-20 17:45 1.44 Days
Continuous		 1082L (63s - 287s) GOI maintenance on strs 27, 29, 37 38  
ALTALINK 02-Dec-20 07:15 03-Dec-20 17:45 1.44 Days
Continuous		 925L (63s - 74s) GOI maintenance on strs 27, 29, 37, 38  
ALTALINK 02-Dec-20 08:00 02-Dec-20 17:00 9 Hours
Daily		 33s6 Advice for TransAlta Brushgear  
ATCO 05-Dec-20 07:00 11-Dec-20 16:00 6.38 Days
Continuous		 9L59 Outage for Garden Plain Wind Project  
ALTALINK 06-Dec-20 07:15 07-Dec-20 17:45 1.44 Days
Continuous		 1083L (63s - 288s) GOI maintenance on strs 133, 135, 154  
ALTALINK 07-Dec-20 07:15 07-Dec-20 12:45 5.5 Hours
Daily		 1049L (138s-59s) GOI Scope of work includes maintenance on structure 1. RB on 1048 due to shared tower  
ATCO 07-Dec-20 10:00 14-Dec-20 15:00 7.21 Days
Continuous		 7L20 Replacement of under rated and rotten crossarms  
ALTALINK 08-Dec-20 07:00 09-Dec-20 18:00 1.46 Days
Continuous		 901L (63s-64s-74s) GOI Scope of work includes maintenance on strs 26, 28, 36 and 37  
ALTALINK 08-Dec-20 08:30 18-Dec-20 09:30 10.04 Days
Continuous		 48s38 (887L) Advice for BCH Structure refurbishment - BC Hydro  
BCH 08-Dec-20 09:00 18-Dec-20 09:40 10.03 Days
Continuous		 1L274 (48s Pocaterra - Britt Creek) structure refurbishment AB-BC
ALTALINK 08-Dec-20 09:00 18-Dec-20 17:00 10.33 Days
Continuous		 48s38 (887L) Advice for BCH Structure refurbishment - BC Hydro  
ATCO 09-Dec-20 07:30 09-Dec-20 17:30 10 Hours
Continuous		 2075S ACF12 Repair Structural Towers Supporting ACF12 Capacitor Banks, No constraints, redundant filter bank ACF22 is still in service  
ALTALINK 09-Dec-20 11:00 09-Dec-20 15:00 4 Hours
Continuous		 250p11 Advice for TransAlta maintenance  
ALTALINK 10-Dec-20 07:00 10-Dec-20 18:00 11 Hours
Daily		 748L & 277s Station - GOI Installing new 25kV Bus tie breaker  
ALTALINK 10-Dec-20 07:00 20-Dec-20 18:00 10.46 Days
Continuous		 1045L (310p - 320p - E805s) - GOI Install Phase raiser assemblies on structures 51, 52, 80, 81 for clearance mitigation.  
ALTALINK 10-Dec-20 07:15 10-Dec-20 17:45 10.5 Hours
Daily		 180L (15s - 928s) GOI Maintenance on Str 540  
ATCO 10-Dec-20 07:30 10-Dec-20 17:30 10 Hours
Continuous		 2075S ACF22 Repair Structural Towers Supporting ACF22 Capacitor Banks, No constraints, redundant filter bank ACF12 is still in service  
ALTALINK 10-Dec-20 09:00 10-Dec-20 13:00 4 Hours
Continuous		 250p22 Advice for TransAlta maintenance  
ALTALINK 10-Dec-20 12:30 10-Dec-20 15:00 2.5 Hours
Daily		 17s49 (717L-Open) - Advice Trip test 17s717W from new s637 breaker fail  
ALTALINK 10-Dec-20 15:30 10-Dec-20 18:00 2.5 Hours
Daily		 17s46 (T3) - Advice Trip test 17s2852 from new s637 breaker fail  
ALTALINK 14-Dec-20 07:00 01-Feb-21 18:00 49.46 Days
Continuous		 277s T2 & 138kV Bus - GOI Reconfiguring the 138kV bus in preparation for the new 398L  
ALTALINK 14-Dec-20 07:15 16-Dec-20 17:45 2.44 Days
Continuous		 928L (42s - 17s) GOI Scope of work includes maintenance on structures 340, 355, 365 and 381  
ALTALINK 14-Dec-20 09:00 17-Dec-20 17:00 3.33 Days
Continuous		 83s 138kV West Bus GOI Taber 83s Urgent Repair - Replace 138kV switch 83s36.  
ATCO 15-Dec-20 07:00 20-Dec-20 17:00 5.42 Days
Continuous		 7L228 Replacement of under rated and rotten crossarms  
ATCO 15-Dec-20 07:00 23-Dec-20 17:00 8.42 Days
Continuous		 730S 702, 730S 704 SVC addition and 144 kv bus rebuild.  
ALTALINK 17-Dec-20 07:15 18-Dec-20 17:45 1.44 Days
Continuous		 906L (42s - 17s) GOI Scope of work includes maintenance on structures 340, 355, 365 and 381  
ATCO 21-Dec-20 10:00 23-Dec-20 15:00 2.21 Days
Continuous		 7L20 Replacement of under rated and rotten crossarms  
ATCO 04-Jan-21 08:00 09-Jan-21 16:00 5.33 Days
Continuous		 7L07 790S Poplar Hill Protection & SCADA Upgrade

Outage on 7L07		  
BCH 04-Jan-21 08:00 29-Jan-21 17:00 25.38 Days
Continuous		 1L274 (48s Pocaterra - Britt Creek) structure refurbishment AB-BC
ATCO 05-Jan-21 08:00 08-Jan-21 16:00 3.33 Days
Continuous		 9L20 56772 Nevis Transformer Addition
9L20 Open -ended		  
ATCO 07-Jan-21 08:00 10-Jan-21 16:00 3.33 Days
Continuous		 7L39, 811S 709 811S Clairmont Lake Protection upgrades
Wiring modification to 21A/7L39 & 21B/7L39
709CT modification, 709 Logic/Alarms, SCADA updates, SCADA End-End Checks and 1Z wiring		  
ATCO 09-Jan-21 08:00 12-Jan-21 16:00 3.33 Days
Continuous		 9L912 56772 Nevis Transformer Addition
9L912 Open -ended		  
ALTALINK 11-Jan-21 07:00 11-Jan-21 18:00 11 Hours
Daily		 1045L (310p - 320p - E805s) - GOI Creating temporary Open Point 'A' @ Structure #1A & Open Point 'B' @ Structure #31  
ALTALINK 11-Jan-21 09:00 15-Jan-21 14:00 4.21 Days
Continuous		 944L (275s - 132s) GOI Replacement of 944L (L5A) protection at 275s Jenner Station  
ALTALINK 11-Jan-21 18:00 09-Feb-21 09:00 28.63 Days
Continuous		 1045L (Open Point 'A' - Open Point 'B') Preliminary outage request to work on 1045L Str 12, installing one new tower, and salvaging one new tower.  
ALTALINK 12-Jan-21 07:00 12-Jan-21 16:00 9 Hours
Daily		 909L (310p - E665s) - GOI Creating temporary Open Point 'C' @ Structure #1A  
ALTALINK 12-Jan-21 16:00 08-Feb-21 09:00 26.71 Days
Continuous		 909L (Open Point 'C' - E665s) - GOI Preliminary outage request to work on Structures 909L2 - 909L6, installing one new tower, and salvaging one new tower  
ATCO 16-Jan-21 08:00 23-Jan-21 16:00 7.33 Days
Continuous		 7L22 790S Poplar Hill Protection & SCADA Upgrade

Outage on 7L22		  
ATCO 18-Jan-21 08:00 01-Feb-21 16:00 14.33 Days
Continuous		 7L32 811S Clairmont Lake Protection upgrades, 710CT modification, 710 Logic/Alarms, SCADA updates, SCADA End-End Checks and 1Z wiring  
ALTALINK 18-Jan-21 09:00 04-Feb-21 18:00 17.38 Days
Continuous		 180L (928s - 255s) GOI Cleresholm Project 180L Str's Range 1-20 to complete the OPGW D/C with 161L  
ATCO 19-Jan-21 10:00 25-Jan-21 17:00 6.29 Days
Continuous		 9L57 Setting poles, for new OPGW to string in  
ATCO 20-Jan-21 08:00 23-Feb-21 16:00 34.33 Days
Continuous		 951S 900BS2, 951S 908, 951S 903, 951S 906 951S construction for 9L162 & 9L193 addition
AESO should be notified of any changes to below workplan:

Jan 20, 2021 – Feb 20, 2021
Isolation pts: 908B,909A
Impact: BKR 908 OOS
Scope of work: Demo bus & install 909A & 909B
Feb 21, 2021 – Feb 23, 2021
Expand to isolation pts:903B, 906B,908B
Impact: BKR 903,BKR 906, 900BS2 OOS
Scope of work: Make connections to 909A & 912A		  
ATCO 25-Jan-21 08:00 26-Jan-21 16:00 1.33 Days
Continuous		 766S 901T, 9L20, 9L912 56772 Nevis Transformer Addition
Tie-in to the new bus for 902T
901T OOS
9L20 OPEN-ENDED
9L912 OPEN-ENDED		  
ALTALINK 01-Feb-21 07:00 28-Feb-21 18:00 27.46 Days
Continuous		 748L & 277s T1 - GOI Installing a new 138kV Breaker and associated equipment  
ALTALINK 01-Feb-21 08:00 04-Feb-21 09:00 3.04 Days
Continuous		 71s1252, 71s1352, 71s1452 (921L & 997L) Replacing M/O Breaker with a new SF6 Breaker & re-wiring JB?  
ATCO 03-Feb-21 07:00 07-Feb-21 17:00 4.42 Days
Continuous		 9L101 Line move for mine expansion.
Attach new line to existing 9L101		  
ALTALINK 04-Feb-21 09:00 11-Feb-21 18:00 7.38 Days
Continuous		 71s1352 (997L)- GOI Replacing M/O Breaker with a new SF6 Breaker  
ALTALINK 08-Feb-21 09:00 08-Feb-21 16:00 7 Hours
Continuous		 909L (310p - E665s) - GOI Closing temporary Open Point 'C' @ Structure #1A  
ALTALINK 09-Feb-21 09:00 09-Feb-21 18:00 9 Hours
Continuous		 1045L (310p - 320p - E805s) - GOI Closing temporary Open Point 'A' @ Structure #1A & Open Point 'B' @ Structure #31  
ALTALINK 10-Feb-21 07:00 17-Feb-21 19:00 7.5 Days
Daily		 1325L (510s - 511s) - GOI Annual Inspection and Maintenance, VCS and Valve Hall Work; AML Crews will be installing vibration recorders on Structures #491 & 494  
ATCO 15-Feb-21 07:00 02-Mar-21 17:00 15.42 Days
Continuous		 972S 900BS2, 9L16 Outage on 907B and 908A for the installation and commissioning of 907 and 907CT  
ALTALINK 16-Feb-21 08:00 23-Feb-21 18:00 7.42 Days
Continuous		 71s1252 (T1 & 921L)- GOI Replacing M/O Breaker with a new SF6 Breaker  
ATCO 16-Feb-21 08:00 01-Mar-21 16:00 13.33 Days
Continuous		 790S 702, 790S 702 Recloser Upgrade protection/alarms on 702 and 7L22 relays.  
ATCO 18-Feb-21 08:00 19-Feb-21 16:00 1.33 Days
Continuous		 733S 701, 733S 7L80D1, 733S 7L80PT, 733S 7L80PT1X, Kakwa Ridge Wiring modifications to 7L80PT and testing needs to be completed. The high side risers to 835s mobile sub will be attached to 7L80 during this outage.  
ATCO 22-Feb-21 08:00 22-Feb-21 18:00 10 Hours
Continuous		 7L65, 7L77 String over 7L65 and 7L77  
ATCO 22-Feb-21 08:00 08-Mar-21 16:00 14.33 Days
Continuous		 733S 144kV Bus, 733S 144kV Bus Protection, 733S 240kV Bus Protection, 733S 25kV Bus Protection, 733S 700PT1, 733S 700PT1X1, 733S 700PT1Y2, 733S 700PT1Y3, 733S 701, 733S 701A, 733S 702, 733S 702A, 733S 702T, 733S 702T Protection, 733S 702TCS, 733S 703, 733S 703A, 733S 7L40 Protection Relay, 733S 7L40D1, 733S 7L40PT, 733S 7L40PT1X, 733S 7L40PTY1, 733S 7L80D1 7L80, 7L40, 702T, 25KV bus protection needs to be upgraded at 733s. This requires a 144KV station outage. 835s will be installed on 7L80 to by pass the 144KV to keep the 25KV load fed.835s mobile sub will be in service power the 25KV.  
ATCO 24-Feb-21 08:00 26-Feb-21 16:00 2.33 Days
Continuous		 951S 900BS1 951S construction for 240kv expansion - 9L162 & 9L193 addition
Connect 910A to 900BS1
Impact: 900BS1 OOS, BKR 901 OOS, BKR 904 OOS, BKR 907 OOS, 920C OOS		  
ATCO 01-Mar-21 07:00 02-Mar-21 17:00 1.42 Days
Continuous		 972S 900BS2, 9L16 Outage on 9L16 to cut the line over to the new bay  
ATCO 02-Mar-21 08:00 11-Mar-21 16:00 9.33 Days
Continuous		 790S 703, 790S 703 Recloser Upgrade 703 and 7L07 protection  
ALTALINK 03-Mar-21 07:00 04-Mar-21 18:00 1.46 Days
Daily		 748L/749AL & 267s Station - GOI Installing a new 138kV Switch & salvaging the existing 138kV Bus  
ATCO 08-Mar-21 07:00 12-Mar-21 17:00 4.42 Days
Continuous		 9L177 Installing new 240Kv Bay (connect 907B to BUS 1) for 620S Goldeye substation connection  
ENMAX 08-Mar-21 08:00 17-Mar-21 12:00 9.13 Days
Continuous		 162.1TR Online Monitoring Installation. Install a new tap changer controller (DEV 90) and test/commission.  
ATCO 08-Mar-21 08:00 22-Mar-21 16:00 14.29 Days
Continuous		 733S 702, 733S 702 Recloser, 733S 702A, 733S 7L40 Protection Relay, 733S 7L40D1, 733S 7L40PT, 733S 7L40PT1X, 733S 7L40PTY1 Complete the protection upgrade at 733s to 7L40 protection.  
ATCO 15-Mar-21 09:00 19-Mar-21 16:00 4.29 Days
Continuous		 7L113 Time Domain Line Protection Project for circuit modifications required to install new relays at Ring Creek 853S & Arcenceil 930S Substations.  
ENMAX 17-Mar-21 12:00 26-Mar-21 16:00 9.17 Days
Continuous		 162.2TR Online Monitoring Installation. Install a new tap changer controller (DEV 90) and test/commission.  
ALTALINK 30-Mar-21 07:00 06-Apr-21 16:30 7.4 Days
Continuous		 207L (L111s - 370s1) GOI Replace 370s207X breaker control and protection  
ATCO 13-Apr-21 07:00 13-Apr-21 19:00 12 Hours
Continuous		 7L101 Protection Upgrade on 7L101 at 790S,
After Changes will need to operate breaker 705 a few times		  
ATCO 26-Apr-21 08:00 01-May-21 16:00 5.33 Days
Continuous		 766S 901T Complete CT, PT, P&C cutover, commission
relays and DTT to 770S Three Hills (option 1) or 1-114S
Ghost Pine (option 2)		  
ATCO 04-May-21 08:00 17-May-21 17:00 13.38 Days
Continuous		 9L02 Louise Creek Rebuild project
Wiring for 903/910BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF protections.		  
ATCO 24-May-21 08:00 06-Jun-21 17:00 13.38 Days
Continuous		 9L40 Louise Creek Rebuild project
Wiring for 903/904BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF protections.		  
ATCO 14-Jun-21 08:00 27-Jun-21 17:00 13.38 Days
Continuous		 9L05 Louise Creek Rebuild project
Wiring for 904/905BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 29-Jun-21 08:00 29-Jun-21 16:00 8 Hours
Continuous		 7LA53 Install new 7LA53 deadend for prepping New Line Addition 7L208  
ATCO 30-Jun-21 08:00 14-Jul-21 16:00 14.33 Days
Continuous		 969S 700 BUS Install and connect mobile sub
Connect temp 4160 supply
Restore power through Mobile Sub
Complete installation and commissioning of 702 bay		  
ATCO 05-Jul-21 08:00 18-Jul-21 17:00 13.38 Days
Continuous		 9L939 Louise Creek Rebuild project
Wiring for 905/906BF relays.
CT ratio changes.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 26-Jul-21 08:00 28-Sep-21 17:00 64.38 Days
Continuous		 9L938, 809S 902T Louise Creek Rebuild project
Replace breakers' 911, 912, and 707.
Add new bus PT 700PT2.
Complete wiring for BF, 21A, 21B, and 701C relays.
CT ratio changes.
Commission apparatus.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 29-Jul-21 08:00 05-Aug-21 17:00 7.38 Days
Continuous		 7L91 P&C wiring and commissioning associated to 7L208 work  
ATCO 22-Aug-21 08:00 22-Aug-21 16:00 8 Hours
Continuous		 766S 901T TransAlta GARDEN PLAIN PROJECT
Complete the structural and electrical work related to protection panel, Automation & SCADA panel and telecom panels.
Complete the line work associated with Line 9LA59 which will be connected to 1045S Garden Plain substation.		  
ATCO 02-Sep-21 08:00 03-Sep-21 16:00 1.33 Days
Continuous		 733S 702T, 733S 144kV Bus 733S Simonette Expansion -Connect New Cap Bank
MD Greenview Pod		  
ALTALINK 07-Sep-21 08:00 07-Sep-21 14:00 6 Hours
Daily		 74s 240kV B2 Bus GOI Creating open point 'A' in 240kV B2 Bus.  
ALTALINK 07-Sep-21 13:00 17-Sep-21 12:30 9.98 Days
Continuous		 74s352, 74s252 (929L) GOI Replace 138kV switches 3N and 3X.  
ALTALINK 17-Sep-21 12:05 17-Sep-21 18:00 5.92 Hours
Daily		 74s 240kV B2 Bus GOI Close open point in 240kV B2 Bus.  
ATCO 29-Sep-21 08:00 01-Oct-21 16:00 2.33 Days
Continuous		 9L59 TransAlta GARDEN PLAIN PROJECT
Line 9LA59 tie-in to Garden Plain Sub		  
ATCO 29-Sep-21 08:00 01-Oct-21 16:00 2.33 Days
Continuous		 801S 903, 801S 902, 9L59 TransAlta GARDEN PLAIN PROJECT
Relay Settings changes		  
ATCO 29-Sep-21 08:00 01-Oct-21 16:00 2.33 Days
Continuous		 972S 901, 972S 902, 9L59 TransAlta GARDEN PLAIN PROJECT
Relay Settings Changes		  
ATCO 04-Oct-21 08:00 17-Oct-21 17:00 13.38 Days
Continuous		 809S 901T Louise Creek Rebuild project
Switch station service to alternate.
Replace bus PT 900PT1.
Complete wiring for BF, 87TA, 87TB, and 51NGR relays.
CT ratio changes.
Commission apparatus.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 05-Oct-21 08:00 12-Oct-21 16:00 7.33 Days
Continuous		 12L44 Suncor Capacity increase project
Cut in new CT and PT circuit extension to the new RAS relays, T&O Line Terminal Open (LTO) on 1206, 1207, and 12L44D1 @ 939S APL Livock and 1244D1, 1205, 1206, 1201TA, and 901TA @ 951S APL Thickwood. Complete commissioning of RAS relays, end-to-end tests including output to Thickwood RAS		  
ATCO 11-Oct-21 08:00 18-Oct-21 16:00 7.33 Days
Continuous		 9L23, 848S 905, 848S 906 Cut in new CT and PT circuit extension to the new RAS relays, complete SCADA terminations  
ATCO 25-Oct-21 08:00 01-Nov-21 16:00 7.33 Days
Continuous		 848S 901T Complete cut in CT/'PT/SCADAcircuits to the new RAS relays  
ATCO 02-Nov-21 08:00 05-Nov-21 16:00 3.33 Days
Continuous		 12L41 Suncor Capacity increase Project
Cut in new CT and PT circuit extension to the new RAS relays, T&O Line Terminal Open (LTO) on 1206, 1207, and 12L41D1 @ 939S APL
Livock and @ 510S Sunnybrook (Altalink). Complete commissioning of RAS relays, end-to-end tests including output to Thickwood RAS		  
ATCO 08-Nov-21 08:00 15-Nov-21 16:00 7.33 Days
Continuous		 848S 902T Cut in new CT and PT circuit extension to the new RAS relays, complete SCADA terminations.  
ATCO 06-Dec-21 08:00 13-Dec-21 16:00 7.33 Days
Continuous		 9L74, 888S 905, 888S 906 Cut in new CT and PT circuit extension to the new RAS relays, complete SCADA terminations.  
ATCO 14-Dec-21 08:00 21-Dec-21 15:00 7.29 Days
Continuous		 7L40 53455 MD Greenview Load Project
Install and commission new 144kV switches 7L40D? and 7L40D? at T-tap location.
Connect 7L40 to 7LA40D2.		  
ATCO 17-Jan-22 08:00 24-Jan-22 16:00 7.33 Days
Continuous		 9L84, 934S 905, 934S 906 Cut in new CT and PT circuit extension to the new RAS relays, complete SCADA terminations.  
ATCO 22-Mar-22 07:00 22-Mar-22 17:00 10 Hours
Continuous		 7L77 7L65 Rebuild Project  
ATCO 29-Jun-22 07:00 01-Jul-22 17:00 2.42 Days
Continuous		 766S 701, 766S 901T RAS modifications for the Pattern Lanfine WAGF project  
ATCO 12-Jul-22 07:00 16-Jul-22 17:00 4.42 Days
Continuous		 7L224, 774S 701 RAS modifications for the Pattern Lanfine WAGF project  
ATCO 27-Jul-22 07:00 31-Jul-22 17:00 4.42 Days
Continuous		 7L760, 767S 702 RAS modifications for the Pattern Lanfine WAGF project  
ATCO 05-Sep-22 08:00 30-Sep-22 16:00 25.33 Days
Continuous		 972S 900BS2 CETO project  
ATCO 22-Oct-22 07:00 02-Nov-22 17:00 11.42 Days
Continuous		 7L129 Re stringing conductor  

AB-BC, AB-SK & AB-MATL: refer to AESO web posting: http://itc.aeso.ca/itc/public/reportIndex.do
Also,
AB-BC, AB-SK & AB-MATL: refer to ISO Rule 203.6: http://www.aeso.ca/rulesprocedures/18592.html

Prepared On: 2020-10-23   2:38:06 PM


This document and the information contained herein are based upon information and data which by their nature contain a degree of uncertainty and are subject to change. In addition, this document may contain information and data from public sources and/or third parties, which have been assumed to be accurate and complete and have not been verified. Accordingly, the Independent System Operator, operating as the Alberta Electric System Operator (the "AESO") makes no warranty, representation or guarantee, express or implied, with respect to this document or the information contained herein, including, but not limited to, any warranty, representation or guarantee of accuracy, completeness, timeliness, reliability, availability, absence of computer virus, non- infringement, merchantability or suitability for any purpose. Under no circumstances will the AESO, its members, officers, employees, contractors or agents, or any of their respective affiliates, be liable for any errors or omissions in, or any losses, damages or claims whatsoever, whether in contract, tort or otherwise, arising from use of or reliance upon, this document or any information contained herein.

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