Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2019-10-26

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
Syncrude 04-Oct-18 09:00 05-Nov-19 20:00 397.5 Days
Continuous		 Mildred T3 (Syncrude Mildred Lake) damaged transformer repairs  
ATCO 24-Aug-19 22:25 31-Oct-19 18:00 67.82 Days
Continuous		 930s Syn Condenser (930s Arcenciel) forced out-of-service  
EPCOR 03-Sep-19 07:00 01-Nov-19 17:00 59.42 Days
Continuous		 816s T2 (816s Petrolia) tap changer & oil reclamation  
SUNCOR 15-Oct-19 08:00 27-Oct-19 18:00 12.42 Days
Continuous		 29PL9-5 (29EDD-1 Millennium - 29EDD-34) planned 5 year maintenance  
ALTALINK 15-Oct-19 10:15 30-Oct-19 17:45 15.31 Days
Continuous		 74s T2 (74s Janet) maintenance  
EPCOR 19-Oct-19 07:00 01-Nov-19 17:00 13.42 Days
Continuous		 CV5 (557s Castle Downs - 511s Victoria), 511s Victoria T5 (511s Victoria) CV5 240 kV splice/ termination  
BCH 21-Oct-19 09:00 31-Oct-19 17:00 10.33 Days
Continuous		 1L275 (799s Coleman - Natal) end-of-life structure replacements AB-BC
BCH 21-Oct-19 09:00 01-Nov-19 17:00 11.33 Days
Continuous		 2L112 (Nelway - Boundary) annual plan request F19. BC Maintenance does not affect the Alberta ATC AB-BC
ALTALINK 22-Oct-19 08:30 29-Oct-19 15:30 7.29 Days
Continuous		 1041L (370s North Lethbridge - 554s Travers), 370s 47 (370s North Lethbridge), 370s 51 (370s North Lethbridge) replace 370s48 and 370s50  
ATCO 24-Oct-19 12:00 20-Dec-19 16:00 57.21 Days
Continuous		 740s 703T (740s H.R.Milner), 7L80 (740s H.R.Milner - 733s Simonette), 740s H.R.Milner 144 kV Main Bus rebuild  
EPCOR 26-Oct-19 07:00 26-Oct-19 17:00 10 Hours
Continuous		 12BU1 @ Genesee Doble  
ALTALINK 26-Oct-19 08:00 26-Oct-19 10:00 2 Hours
Continuous		 17s23 - Advice, 17s23 (17s Benalto) Cutover Breaker Fail Trip from old 17s9 Protection to new Protection and complete Functional Trip Test  
ALTALINK 26-Oct-19 08:00 26-Oct-19 10:00 2 Hours
Continuous		 17s23 - Advice, 17s23 (17s Benalto) Cutover Breaker Fail Trip from old 17s9 Protection to new Protection and complete Functional Trip Test  
ALTALINK 26-Oct-19 11:00 26-Oct-19 13:30 2.5 Hours
Daily		 17s43 - Advice, 17s43 (17s Benalto) Cutover Breaker Fail Trip from old 17s9 Protection to new Protection and complete Functional Trip Test  
EPCOR 27-Oct-19 07:00 27-Oct-19 17:00 10 Hours
Continuous		 12BU2 @ Genesee Doble  
ALTALINK 27-Oct-19 09:45 01-Nov-19 18:15 5.35 Days
Continuous		 281s T1 (Tx18897) - GOI Repair Leak and Tx testing  
EPCOR 28-Oct-19 07:00 28-Oct-19 17:00 10 Hours
Continuous		 J2403 @ Jasper Substation Switch and breaker operation for Nait Student Demo  
EPCOR 28-Oct-19 07:00 22-Nov-19 17:00 25.46 Days
Continuous		 CC721 @ Cloverbar Breaker Replacement  
ALTALINK 28-Oct-19 08:30 01-Nov-19 16:30 4.33 Days
Continuous		 17s8 - GOI Replace 17s8 breaker control and fail module. Remove REcloser for 17s8 Breaker  
ALTALINK 28-Oct-19 09:00 30-Oct-19 08:00 1.96 Days
Continuous		 28s T1(Tx18701)& 138 kV Bus1 - GOI Install new air break control module for 28s20 (1389)  
ALTALINK 28-Oct-19 10:15 31-Oct-19 17:45 3.31 Days
Daily		 37s86 (930L) GOI 240kV VT Replacement  
ALTALINK 28-Oct-19 11:30 29-Oct-19 17:00 29.5 Hours
Continuous		 74s C3 & C4 Advice SCADA equipment upgrade, migrate new alarms, controls, analogs and remote access to new SCADA system. Work affects 74s104, 74s102 and C3. Need both cap banks for 1.5 day then just C3.  
ALTALINK 29-Oct-19 07:00 03-Nov-19 17:30 5.48 Days
Continuous		 1072L (205s - 103s) GOI Move CT circuit from 205s452 to 205s252, Trip testing of breakers, Line protection setting changes.  
Syncrude 29-Oct-19 08:00 31-Oct-19 20:00 2.5 Days
Continuous		 Significant - Bus-2 (72kV) Outage, to suppot MH-2 Outage, At Aurora G01 Susbsation. Transformer T11 will be de-energized for swtiching purpose only. Significant - Bus-2 (72kV) Outage, to suppot MH-2 Transmission Line Outage (72kV), Fed From Aurora G01 Susbsation. CB 52-14, 24 and 34 will be operated. MOD- 52, CB 52-213, 223 at T11 will be operated.  
ENMAX 29-Oct-19 08:00 07-Nov-19 17:00 9.42 Days
Continuous		 ENMAX 25 2GSU-XF-001 (ENMAX 25) HV SW maint SW138, SW139, MD maint MD-2GSU. Doble 240kV 25MCT2, 25PT240-Z44. Corrective 25 Sub SW 139 Hot Spot Repair. Substation washing (weather dependant). Replace switch mech SW138, SW139.  
ALTALINK 29-Oct-19 16:00 31-Oct-19 16:30 2.02 Days
Continuous		 74s C3 Advice SCADA equipment upgrade, migrate new alarms, controls, analogs and remote access to new SCADA system. Work affects 74s102 and C3. Continuation after restoring 74s104 and C4.  
ALTALINK 30-Oct-19 07:00 11-Nov-19 17:00 12.46 Days
Continuous		 777L (48s - 245s) - GOI Fire Mitigation Work on Structures #18, 19, 20, 21, 22 ,26, 31, 32, 33, 36, 42, 91, 92, 95, 96, 97, 103, 105, 106, 106A, 111, 112, 113, 116, 117, 119, 121A, 122, 123, 124, 126, 127, 129, 130, 132, 133, 229 and 231. AB-BC
ALTALINK 30-Oct-19 08:30 31-Oct-19 15:00 30.5 Hours
Continuous		 28s T2(Tx18775)& 240 kV Bus2 - GOI Install new air break control module for 28s50 (1489).  
ATCO 31-Oct-19 10:00 31-Oct-19 14:00 4 Hours
Continuous		 2075S Station General Equipment, 13L50 (DC LINK) 2075s LOP 848 Light emitter fault
Emergency replacement of Light emitter boards.
During Power Direction Change on 13L50, requesting moving from de-blocked to blocked for about 2 hours to replace light emitter boards in VBE Cabinet to clear alarms.
13L50 will be unavailable for transfer during outage		  
ALTALINK 31-Oct-19 13:00 31-Oct-19 16:00 3 Hours
Daily		 17s39 (928L-Open) - Advice Trip test to 17s9 from new 17s8 breaker fail  
ALTALINK 01-Nov-19 08:00 01-Nov-19 16:00 8 Hours
Daily		 17s (903L-Open) - Advice Replace control module for 17s903N, trip test to 17s7 from new 17s8 breaker fail. Operate s903N.  
ENMAX 01-Nov-19 08:00 04-Nov-19 16:00 3.38 Days
Continuous		 936L Replace insulators on Enmax's portion of line  
ALTALINK 04-Nov-19 06:45 07-Nov-19 18:15 3.48 Days
Continuous		 920L (37s - 557s) GOI Replace 240kV Switch (37s87), 240kV PTs (37s85)  
EPCOR 04-Nov-19 07:00 04-Nov-19 17:00 10 Hours
Continuous		 TX2 @ Castledowns Doble  
EPCOR 04-Nov-19 07:00 08-Nov-19 17:00 4.42 Days
Continuous		 TX1 @ Jasper Doble  
BCH 04-Nov-19 08:00 06-Nov-19 19:00 2.46 Days
Continuous		 5L52 (Ingledow - Custer) BPA work AB-BC
ALTALINK 04-Nov-19 08:30 08-Nov-19 16:30 4.33 Days
Continuous		 17s7 - GOI 17s7 Replace breaker control and fail module replacement  
ALTALINK 04-Nov-19 09:00 06-Nov-19 08:00 1.96 Days
Continuous		 28s T2(Tx18775)& 138 kV Bus2 - GOI Install new air break control module for 28s49 (1589).  
BCH 04-Nov-19 09:00 08-Nov-19 17:00 4.33 Days
Continuous		 1L274 (Britt Creek - 1D4L274) Annual Plan Request F20 - Ian Kozicky
Refurbishment project - replace structures and related components.		  
ALTALINK 04-Nov-19 10:00 04-Nov-19 14:00 4 Hours
Daily		 777L (48s - 245s) - GOI FortisAlberta Kananaskis Area Reliability Project: Disconnect high side of 471s mobile.  
ALTALINK 04-Nov-19 10:00 08-Nov-19 15:00 4.21 Days
Continuous		 900L (63s-17s) - Advice Migrate and commission all L1 – 900L at 63S Red Deer associated line protections, breakers, breaker fail and Tele-protection alarms, status, controls, metering and remote access to new RTU and LAN. Migrate and commission VT-1 alarms. Replace and commission new 63S900W (389) airbreak control module.  
ALTALINK 04-Nov-19 11:00 05-Nov-19 15:30 28.5 Hours
Continuous		 77s 57 (77s Sagitawah) 240kV breaker maintenance  
ALTALINK 04-Nov-19 12:00 25-Nov-19 18:00 21.25 Days
Continuous		 87s T2 (Tx18339) - GOI 87s T2 corrosive sulphur mitigation  
ENMAX 05-Nov-19 08:00 07-Nov-19 18:00 2.42 Days
Continuous		 25s. 25B240-D131. 25B240-D134. 25B240-D140. 240kV Bus HV SW maint SW145, SW149. Replace switch mech SW145, SW149. Original outage Nov. 7  
ENMAX 05-Nov-19 08:00 08-Nov-19 16:00 3.33 Days
Continuous		 937L Replace insulators on Enmax's portion of line  
ALTALINK 05-Nov-19 15:30 06-Nov-19 15:00 23.5 Hours
Continuous		 77s 54 (77s Sagitawah) 240kV breaker maintenance  
ALTALINK, Lethbridge 06-Nov-19 08:00 09-Nov-19 17:00 3.38 Days
Continuous		 824L (593s Lethbridge Lakeview - 618s Riverbend) Set anchors in advance of 824L Outage  
ALTALINK 06-Nov-19 15:00 07-Nov-19 16:30 25.5 Hours
Continuous		 77s 51 (77s Sagitawah) 240kV breaker maintenance  
ALTALINK 07-Nov-19 08:00 07-Nov-19 09:30 90 Mins
Daily		 17s57 - Advice Trip test 17s11 from new 17s7 breaker control and fail module  
ALTALINK 07-Nov-19 08:30 07-Nov-19 14:30 6 Hours
Continuous		 650s 752 (650s Hansman Lake) breaker maintenance  
ALTALINK 07-Nov-19 09:00 07-Nov-19 13:00 4 Hours
Daily		 67s820, 67sT2, 67s2 GOI to connect Mobile.  
ALTALINK 07-Nov-19 09:30 07-Nov-19 11:30 2 Hours
Daily		 17s26 - Advice Trip test 17s6 from new 17s7 breaker control and fail module  
ALTALINK 07-Nov-19 12:00 07-Nov-19 13:30 90 Mins
Daily		 17s31 - Advice Trip test 17s1 from new 17s7 breaker control and fail module  
Syncrude 08-Nov-19 08:00 17-Nov-19 20:00 9.5 Days
Continuous		 Significant outage - D05 Substation 260/72 kV Outage - Zone 1. Following Cicuit Breakers will operated: 211 (Aurora G01 Substation), 213 (Aurora G01 Substation), 519, 517, 511, 71 at D05 Following MOD will be Operated: 215 (Aurora G01 Substation), 520, 519B, 519A, 517B, 517A, 511B, 511A, 510, 71A at D05 Significant outage - D05 Substation 260/72 kV Outage - Zone 1.
Following Cicuit Breakers will operated: 211 (Aurora G01 Substation), 213 (Aurora G01 Substation),
519 , 517, 511, 71 at D05

Following MOD will be Operated:

215 (Aurora G01 Substation), 520, 519B, 519A, 517B, 517A, 511B, 511A, 510, 71A at D05		  
ALTALINK 08-Nov-19 14:00 08-Nov-19 15:30 90 Mins
Daily		 17s42 - Advice Trip test 17s10 from new 17s7 breaker control and fail module  
ALTALINK 08-Nov-19 15:30 08-Nov-19 17:00 90 Mins
Daily		 17s46 (T3)- Advice Trip test 17s2852 from new 17s7 breaker control and fail module  
ALTALINK 08-Nov-19 17:30 08-Nov-19 19:00 90 Mins
Daily		 17s8 (903L-Open) - Advice Trip test 17s8 from new 17s7 breaker control and fail module  
ALTALINK 11-Nov-19 07:00 20-Nov-19 19:00 9.5 Days
Continuous		 310p T30 & 69 kV Bus GOI Replace 69 kV Bus Diff prot., Place donut CTs on T30 for new 240 protection.  
ENMAX 11-Nov-19 08:00 12-Nov-19 18:00 1.42 Days
Continuous		 162.2TR Oil sampling bushing, TC. Check reversing switch. HV SW maint SW88. Replace switch mech. SW136  
EPCOR 12-Nov-19 07:00 13-Dec-19 17:00 31.42 Days
Continuous		 Isolation of 1139L from E816S Petrolia S/S and 376S Harry Smith S/S Cut in of 1139L and 1164L into Riverview S/S as part of Riverview energization.  
ALTALINK 12-Nov-19 08:00 13-Nov-19 16:00 1.33 Days
Daily		 603L (138s - 243s) GOI Install and test new tele-protection module that provides transfer tripping between 138s Windy Flats and 243s Soderglen  
SUNCOR 12-Nov-19 08:00 15-Nov-19 18:00 3.42 Days
Continuous		 29EDD-1 29EDD1S1552 (29EDD-1) SF6 Gas Leak testing on 29EDD1S1552  
ALTALINK 12-Nov-19 08:00 03-Dec-19 18:00 21.42 Days
Continuous		 1139L (367s-E816s) GOI Cutting in EPCOR new sub (Riverview)  
ALTALINK 12-Nov-19 10:00 14-Nov-19 15:00 2.21 Days
Continuous		 925L (63s-74s) - Advice Migrate and commission all L6 – 925L at 63S Red Deer associated line protections, breakers, breaker fail and Tele-protection alarms, status, controls, metering and remote access to new RTU and LAN. Migrate and commission VT-6 alarms. Replace and commission new 63S925X (489) airbreak control module.  
ALTALINK 12-Nov-19 11:00 12-Nov-19 13:30 2.5 Hours
Daily		 67s12 Advice Line crew to create Open Point C  
ALTALINK 12-Nov-19 11:00 12-Nov-19 13:30 2.5 Hours
Daily		 67s97 Advice Line crew to create Open Point D  
ALTALINK 12-Nov-19 11:00 15-Nov-19 17:00 3.25 Days
Continuous		 37.82L (74s - ENMAX 37SUB) Advice SCADA equipment upgrade, migrate new alarms, controls, analogs and remote access to new SCADA system.  
ALTALINK 12-Nov-19 14:00 10-Dec-19 16:00 28.08 Days
Continuous		 67s 69kV bus, 225L, T1 and 25kV bus GOI Mobile connected and carrying load. replace 67a508x breaker, Install new L1 and L2 21kV line arrestors, Remove existing 69kV disconnect on top of 69kv Bay, Remove SS1 transformer, Remove 69kV Bus Arrestors next to VT1, Replace existing hookswitches 67s11, 67s95, 67s224, Replace existing crossings arms for 67s11, 67s12, 67s95, 67s224, 69s226, Replace PTs 1247 and 1248 at 67s14, Replace various 69KV insulators, Replace circuit switcher 67s31 with new breaker and Relocate all existing P&C equipment from Building 1 to Buildings 2 and 3.  
ENMAX 13-Nov-19 08:00 14-Nov-19 18:00 1.42 Days
Continuous		 162.1TR Oil sampling bushing, TC. Check reversing switch. Replace switch mech. SW131, SW141  
ALTALINK 13-Nov-19 08:30 13-Nov-19 17:30 9 Hours
Daily		 347s199E GOI work on new 138 kV Bus protection. Connect CT circuit and trip test  
ALTALINK 14-Nov-19 08:30 14-Nov-19 17:30 9 Hours
Daily		 347s199W GOI work on new 138 kV Bus protection. Connect CT circuit and trip test  
Syncrude 15-Nov-19 08:00 24-Nov-19 20:00 9.5 Days
Continuous		 Significant outage - D05 Substation 260/72 kV Outage - Zone 2. Following Cicuit Breakers will operated: 910 (Ruth Lake – by ATCO), 911 (Ruth Lake – by ATCO), 517, 516, 513, 78 at D05 . Following MOD will be Operated: RL-1D1 (Ruth Lake – by ATCO), 518, 517A, 517B, 516B, 516A, 513A, 513B, 509, 78A at D05 Significant outage - D05 Substation 260/72 kV Outage - Zone 2.
Following Cicuit Breakers will operated: 910 (Ruth Lake – by ATCO), 911 (Ruth Lake – by ATCO), 517, 516, 513, 78 at D05 .

Following MOD will be Operated:

RL-1D1 (Ruth Lake – by ATCO), 518, 517A, 517B, 516B, 516A, 513A, 513B, 509, 78A at D05		  
EPCOR 15-Nov-19 23:00 17-Nov-19 23:00 2 Days
Continuous		 72CN10 (987s Clover Bar - Namao), Bus 1 @ Cloverbar, G3 Auxilliary contacts and Doble  
EPCOR 18-Nov-19 07:00 22-Nov-19 17:00 4.42 Days
Continuous		 TX1@ East Industrial CVT Replacement  
ENMAX 18-Nov-19 08:00 19-Dec-19 16:00 31.33 Days
Continuous		 918L Line Protection Upgrade  
EPCOR 18-Nov-19 09:30 22-Nov-19 17:00 4.31 Days
Continuous		 909L - East (Dome - Ellerslie) Insulation & Aerial Marker Upgrades  
ALTALINK 18-Nov-19 10:00 21-Nov-19 15:00 3.21 Days
Continuous		 1083L (63s-288s) - Advice Migrate and commission all L3 –1083L at 63S Red Deer associated line protections, breakers, breaker fail and Tele-protection alarms, status, controls, metering and remote access to new RTU and LAN. Migrate and commission VT-3 alarms. Replace and commission new 63S1083W (589) airbreak control module.  
ALTALINK 18-Nov-19 10:15 19-Nov-19 17:45 31.5 Hours
Continuous		 266s FSC1 - GOI Yearly maintenance  
ALTALINK 18-Nov-19 11:00 21-Nov-19 17:00 3.25 Days
Continuous		 985L (74s - ENMAX 25SUB) Advice SCADA equipment upgrade, migrate new alarms, controls, analogs and remote access to new SCADA system.  
ATCO 18-Nov-19 12:00 22-Nov-19 12:00 4 Days
Continuous		 7L73, 7L73 (829s Boucher Creek - 800s Friedenstal) Line Maintenance  
ALTALINK 19-Nov-19 08:00 19-Nov-19 17:00 9 Hours
Daily		 244s T1 (244s Bowmanton) Techs to investigate tap changer controller issues  
ALTALINK 19-Nov-19 08:00 20-Nov-19 16:00 1.33 Days
Continuous		 103s 138 kV BUS 1 (103s Goose Lake) Replace A phase PT of VT7/SS2  
ALTALINK 20-Nov-19 08:15 21-Nov-19 17:45 1.4 Days
Continuous		 266s FSC2 - GOI Yearly maintenance  
Syncrude 22-Nov-19 08:00 01-Dec-19 20:00 9.5 Days
Continuous		 Significant outage - D05 Substation 260/72 kV Outage - Zone 3. Following Cicuit Breakers will operated: 902 (Ruth Lake – by ATCO only after RL-1 power has been restored) 907 (Ruth Lake – by ATCO only after RL-1 power has been restored). CB 512, 513 at D05. Following MOD will be Operated: RL-2D1 (Ruth Lake – by ATCO only after RL-1 power has been restored) 515, 512A, 512B, 513A, 513B at D05. Significant outage - D05 Substation 260/72 kV Outage - Zone 3.
Following Cicuit Breakers will operated: 902 (Ruth Lake – by ATCO only after RL-1 power has been restored)
907 (Ruth Lake – by ATCO only after RL-1 power has been restored). CB 512, 513 at D05.

Following MOD will be Operated:
RL-2D1 (Ruth Lake – by ATCO only after RL-1 power has been restored) 515, 512A, 512B, 513A, 513B at D05.		  
ALTALINK 25-Nov-19 09:00 29-Nov-19 16:00 4.29 Days
Continuous		 59s T1(18184) & 138kV Bus(616L) - GOI Replace 138kv switches (59s7, 6, 10 and 5) and insulators.  
ALTALINK 25-Nov-19 10:00 28-Nov-19 15:00 3.21 Days
Continuous		 912L (63s-766s) - Advice Migrate and commission all L4 – 912L at 63S Red Deer associated line protections, breakers, breaker fail and Tele-protection alarms, status, controls, metering and remote access to new RTU and LAN. Migrate and commission VT-4 alarms. Replace and commission new 63s912E (889) airbreak control module.  
ALTALINK 25-Nov-19 11:00 28-Nov-19 17:00 3.25 Days
Continuous		 1003L (74s - ENMAX 25SUB) Advice SCADA equipment upgrade, migrate new alarms, controls, analogs and remote access to new SCADA system.  
ATCO 25-Nov-19 12:00 29-Nov-19 12:00 4 Days
Continuous		 7L73, 7L73 (829s Boucher Creek - 800s Friedenstal) Line Maintenance  
ALTALINK 28-Nov-19 12:00 02-Dec-19 13:00 4.04 Days
Continuous		 58s153W GOI Trip wiring and commissioning to breaker 53s153W from 38B/B87 protection relay, replace strain insulators on 153L structure.  
Syncrude 29-Nov-19 08:00 08-Dec-19 20:00 9.5 Days
Continuous		 Significant outage - D05 Substation 260/72 kV Outage - Zone 4. Following Cicuit Breakers will operated: 222 (Aurora G01 Substation), 223 (Aurora G01 Substation), and 511, 512 at D05 Following MOD will be Operated: 225 (Aurora G01 Substation), and 514, 511A, 511B, 512A, 512B at D05. Significant outage - D05 Substation 260/72 kV Outage - Zone 4.
Following Cicuit Breakers will operated: 222 (Aurora G01 Substation), 223 (Aurora G01 Substation), and 511, 512 at D05

Following MOD will be Operated:
225 (Aurora G01 Substation), and 514, 511A, 511B, 512A, 512B at D05.		  
ENMAX 02-Dec-19 08:00 04-Dec-19 16:00 2.33 Days
Continuous		 162.81L, 162.81L (ENMAX 162 Beddington - 391S Balzac) Replace line structure.  
BCH 02-Dec-19 09:00 13-Dec-19 17:00 11.33 Days
Continuous		 1L274 (48s Pocaterra - Britt Creek) annual maintenance AB-BC
ALTALINK 02-Dec-19 10:00 05-Dec-19 15:00 3.21 Days
Continuous		 912L (63s-766s) - Advice Migrate and commission all L7 –1082 at 63S Red Deer associated line protections, breakers, breaker fail and Tele-protection alarms, status, controls, metering and remote access to new RTU and LAN. Migrate and commission VT-7 alarms. Replace and commission new 63S1082 (1189) airbreak control module.  
ALTALINK 04-Dec-19 08:00 13-Dec-19 17:30 9.4 Days
Continuous		 19s T10, 138kV Bus 1, bus 2 and T8 GOI Salvage 138kv structure and switches 19s75 and 19s74. Replace 138kv insulators, relocate 19s7 and 19s240(will be in the same location)  
ALTALINK 06-Dec-19 09:30 06-Dec-19 13:30 4 Hours
Daily		 17s 240kV Bus 2 - GOI Replace 17s906X. Bus outage needed to disconnect 17s906X switch base from 906L.  
ATCO 09-Dec-19 08:30 10-Dec-19 17:00 1.35 Days
Continuous		 7L129 Line inspection of 7L129  
BCH 10-Dec-19 09:00 20-Dec-19 17:00 10.33 Days
Continuous		 1L274 (48s Pocaterra - Britt Creek) annual maintenance AB-BC
ALTALINK 10-Dec-19 12:30 10-Dec-19 16:30 4 Hours
Daily		 17s 240kV Bus 2 - GOI Replace 17s906X. Bus outage needed to Re-connect 17s906X switch base to 906L.  
ALTALINK 11-Dec-19 08:30 11-Dec-19 11:30 3 Hours
Daily		 67s97 Advice Line crew to close Open Point D  
ALTALINK 11-Dec-19 08:30 11-Dec-19 11:30 3 Hours
Daily		 67s12 Advice Line crew to close Open Point C  
ATCO 11-Dec-19 08:30 12-Dec-19 17:00 1.35 Days
Continuous		 7L129 Line inspection of 7L129  
ALTALINK 11-Dec-19 12:00 11-Dec-19 15:00 3 Hours
Daily		 67s820, 67sT2, 67s2 GOI to Disconnect Mobile.  
ALTALINK 12-Dec-19 10:00 12-Dec-19 15:00 5 Hours
Daily		 69s 138kV bus GOI(affecting 723L and 7L2 A cable needs to be removed from the PT Secondary circuit connecting Panel #10 to Panel #11. Fuse blocks will also have to be removed. The cable that is to be removed shares terminals with the cable connected to the PT JB.  
ATCO 07-Jan-20 08:00 27-Jan-20 17:00 20.38 Days
Continuous		 834S 902T Three Creeks Project
Install the 240 kV switches (close proximity to energized bus),
String the flex bus between the bus A-Frames and line A-Frames
Re configure the pipe bus to its final configuration
Commission 902T logic to new breakers		  
ALTALINK 08-Jan-20 07:15 09-Jan-20 17:45 1.44 Days
Continuous		 320p1352 (1045AL) GOI Settings Changes of Sync Check and Functional Testing on 320p1352  
ATCO 13-Jan-20 08:00 17-Jan-20 17:00 4.38 Days
Continuous		 7L131 To facilitate the installation of the new 9L124 and 9L139 we need to lower 7L08, 7L131 and 7L106  
ATCO 20-Jan-20 07:00 23-Jan-20 16:00 3.38 Days
Continuous		 9L59 Outage for Garden Plain Wind Project  
ATCO 20-Jan-20 08:00 24-Jan-20 17:00 4.38 Days
Continuous		 7L106 To facilitate the installation of the new 9L124 and 9L139 we need to lower 7L08, 7L131 and 7L106  
ATCO 20-Jan-20 08:00 03-Feb-20 16:00 14.33 Days
Continuous		 740S 701 Replace BKR 701, replace 701PT
Milner Power Generation out of service for duration		  
ALTALINK 28-Jan-20 07:15 29-Jan-20 17:45 1.44 Days
Continuous		 788L (788L107A-A898s-602L1) - GOI 788L Components Str's Range 151-282  
ATCO 31-Jan-20 09:00 13-Mar-20 16:00 42.25 Days
Continuous		 807s 902T (807s Sheerness), 9L100, 807S 902 807S BKR 902 maintenance & 9L100 protection upgrade
Work has been coordinated with ATCO Power and it was stated that 807S unit #2 Shutdown will occur from Jan 31 to March 13, 2020, outages are dependant on 807S unit 2 shutdown
Outage zone needs to expand from 9100D1 to 910B & 911B to include 910 & 911 for testing		  
ATCO 03-Feb-20 08:00 16-Feb-20 16:00 13.33 Days
Continuous		 740S 704, 7L20 replace breaker and re conductor switches  
ENMAX 03-Feb-20 08:00 01-Mar-20 16:00 27.33 Days
Continuous		 162.81L Line Protection Upgrade  
ALTALINK 03-Feb-20 12:15 06-Feb-20 17:45 3.23 Days
Continuous		 794L (157s-A819s) - GOI 794L Components Str's Range 9-258  
ALTALINK 18-Feb-20 12:15 20-Feb-20 17:45 2.23 Days
Continuous		 794L (157s-A819s) - GOI Component Replacements STR 9-258  
ATCO 06-Mar-20 07:00 13-Mar-20 17:00 7.38 Days
Continuous		 9L101 Line move for mine expansion.
Attach new line to existing 9L101		  
ENMAX 06-Apr-20 08:00 17-Apr-20 18:00 11.42 Days
Continuous		 36.81L. Haskayne line raise project. Raising the line and replacing 4 structures to accommodate a new road construction.  
ATCO 02-Jul-20 08:00 15-Jul-20 16:00 13.33 Days
Continuous		 7L587 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 16-Jul-20 08:00 29-Jul-20 16:00 13.33 Days
Continuous		 7L89 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 30-Jul-20 08:00 12-Aug-20 16:00 13.33 Days
Continuous		 7L91 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 03-Aug-20 07:00 03-Nov-20 17:00 92.46 Days
Continuous		 972S 905B Halkirk 2 Windfarm Project  
ATCO 03-Aug-20 08:00 15-Nov-20 16:00 104.38 Days
Continuous		 848S 900BS2, 848S 900BS1, RL1, 848S 901T, 848S 902T, 9L01 848S Ruth Lake 240kv expansion for 29PL9-26  
ALTALINK 11-Aug-20 08:00 11-Aug-20 18:00 10 Hours
Daily		 861L(258s-71s) and 258s 138kV Bus 2 GOI Replacement of 861L Strain Insulators at 258s. Remove Bus #2 from service as line crosses 138kV Bus.  
ALTALINK 11-Aug-20 08:00 11-Aug-20 19:00 11 Hours
Daily		 862L(258s-166s) and 258s 138kV Bus 1 GOI Replacement of 862L Strain Insulators at 258s. Remove Bus #1 from service as line crosses 138kV Bus.  
ATCO 13-Aug-20 08:00 26-Aug-20 16:00 13.33 Days
Continuous		 9L36 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 27-Aug-20 08:00 09-Sep-20 16:00 13.33 Days
Continuous		 9L37 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 10-Sep-20 08:00 01-Oct-20 16:00 21.33 Days
Continuous		 826S 901T 240/144kV Breaker Fail Protection
(901T OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 14-Sep-20 07:00 23-Sep-20 17:00 9.42 Days
Continuous		 972S 900BS1 Installing new 240Kv Bay (connect 907B to BUS 1) for 620S Goldeye substation connection  
SUNCOR 14-Sep-20 09:00 20-Sep-20 18:00 6.38 Days
Continuous		 29EDD-1 5yr and 10 yr maintenance on 29CTT-1 in 29EDD-1

Elements not available:
29CVT-1, 29PL9-2		  
ATCO 23-Sep-20 07:00 25-Sep-20 17:00 2.42 Days
Continuous		 972S 900BS2, 9L16 Installing new 240Kv Bay (connect 909A to BUS 2) for 620S Goldeye substation connection
Cutover 9L16 to New Bay		  
ATCO 25-Sep-20 07:00 28-Sep-20 17:00 3.42 Days
Continuous		 9L177 Installing new 240Kv Bay for 620S Goldeye substation connection
Cutover 9L177 to New Bay		  
ATCO 28-Sep-20 07:00 29-Sep-20 17:00 1.42 Days
Continuous		 9L62 Installing new 240Kv Bay for 620S Goldeye substation connection
String 9L62 into 972S Tinchebray		  
ATCO 02-Oct-20 08:00 23-Oct-20 16:00 21.33 Days
Continuous		 826S 902T 240/144kV Breaker Fail Protection
(902T OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ENMAX 09-Oct-20 08:00 12-Oct-20 16:00 3.33 Days
Continuous		 162s PT-Z41. 1-GSU-XF-0001 Replace 87-XF1 B differential protection. Commission checks and trip testing  
ATCO 22-Oct-20 07:00 27-Oct-20 17:00 5.42 Days
Continuous		 7L65, 7L77 7L65 Rebuild Project  
ATCO 05-Jan-21 08:00 08-Jan-21 16:00 3.33 Days
Continuous		 9L20 56772 Nevis Transformer Addition
9L20 Open -ended		  
ATCO 09-Jan-21 08:00 12-Jan-21 16:00 3.33 Days
Continuous		 9L912 56772 Nevis Transformer Addition
9L912 Open -ended		  
ATCO 20-Jan-21 08:00 23-Feb-21 16:00 34.33 Days
Continuous		 951S 900BS2, 951S 908, 951S 906, 951S 903 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		  
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  
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 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  

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: 2019-10-16   3:48:02 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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