Alberta Electric System Operator
System Co-ordination Plan
2026-07-11 to 2026-07-17
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
26-Jul-24 10:00 31-Jul-26 16:00 ATCO Outage 826s 504R (826s Marguerite Lake) emergency removal to replace failed 502R @834S 17,646 Hours
Continuous		  
20-Mar-25 08:00 31-Jul-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 11,961 Hours
Continuous		  
25-Nov-25 17:46 18-Sep-26 18:00 ATCO Outage 876s 901T (876s Brintnell) forced outage oil leaking 7,127.23 Hours
Continuous		  
27-Nov-25 08:30 27-Nov-27 16:30 ALTALINK TE 89s Protection & Control (89s Ellerslie) DSP card replacements on1057L B87/L3 and B240B1 B87/240B1 17,528 Hours
Daily		  
04-Jan-26 08:00 02-Sep-26 16:00 SUNCOR Outage 29EDD-34 260kV Bus 29PP-45 (29EDD-34), 29EDD-34 29-952-113 (29EDD-34), 29EDD-34 29PS-216 (29EDD-34) urgent repairs on 29PT-224 at 29EDD34 on 29PP-45 bus 5,791 Hours
Continuous		  
21-Jan-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV switchgear replacement 6,775 Hours
Continuous		  
09-Feb-26 09:00 16-Jul-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) block all 50BF protection until cutovers and associated commissioning are complete 3,607 Hours
Continuous		  
06-Mar-26 17:00 13-Nov-26 17:00 EPCOR Outage T1 (Woodcroft) woodcroft: TX1 LCR civil 6,048 Hours
Continuous		  
10-Mar-26 10:00 30-Nov-26 17:00 ATCO TE 743s RTU/SCADA (743s Sarah Lake) throughout the course of the project, different apparatus are being replaced, RTU will be blocked prior to download 6,368 Hours
Continuous		  
11-Mar-26 13:45 31-Jul-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 3,410.25 Hours
Continuous		  
01-May-26 17:00 25-Nov-26 17:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 4,993 Hours
Continuous		  
19-May-26 07:00 02-Oct-26 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking - relay maintenance and bus differential upgrade project 2,434 Hours
Continuous		  
26-May-26 09:30 15-Jul-26 16:30 ALTALINK Outage 157s C1 (157s Lac La Biche) trip test (157s852) 1,207 Hours
Continuous		  
27-May-26 18:00 17-Jul-26 10:59 ALTALINK Outage 526s C1 (526s Buffalo Creek) forced outage 1,216.98 Hours
Daily		  
01-Jun-26 09:00 16-Jul-26 17:30 ATCO TE 865s RTU/SCADA (865s Saddlehills) updating RTU/station controller configuration during SCADA upgrade project 1,088.5 Hours
Continuous		  
02-Jun-26 10:00 15-Jul-26 16:00 ATCO Outage 743s 701T (743s Sarah Lake), 743s 705 (743s Sarah Lake), 743s 605 (743s Sarah Lake), 743s 501 (743s Sarah Lake) 743S Sarah lake rebuild 990 Hours
Continuous		  
04-Jun-26 07:01 10-Feb-27 17:00 EPCOR Outage T1 (Rossdale) rossdale: TX1 lcr civil 6,034.98 Hours
Continuous		  
07-Jun-26 17:05 01-Oct-26 00:00 ACCIONA, ENBRIDGE, ICPCL Outage 139s C1 (139s Hillridge) forced outage 2,766.92 Hours
Continuous		  
08-Jun-26 07:00 30-Oct-26 17:00 EPCOR TE EP 511s Protection & Control (EP 511s Victoria) 72kV breaker fail protection blocking 2,626 Hours
Continuous		  
09-Jun-26 07:00 15-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 826.5 Hours
Continuous		  
09-Jun-26 07:00 15-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 50BF/705 for relay testing 178.5 Hours
Continuous		  
09-Jun-26 07:00 15-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 50BF/605 for relay testing 178.5 Hours
Continuous		  
15-Jun-26 07:00 24-Jul-26 17:00 EPCOR Outage EP 805s J2403 (EP 805s Jasper) J2403 replacement LCR 946 Hours
Continuous		  
15-Jun-26 07:00 04-Sep-26 17:00 EPCOR TE 805s Protection & Control (805s Jasper) protection blocking, breaker replacement project 1,954 Hours
Continuous		  
15-Jun-26 07:00 17-Jul-26 17:00 EPCOR Outage 72JM18 (EP 805s Jasper - Meadowlark), M721 (Meadowlark), M722 (Meadowlark), EP 805s J722 (EP 805s Jasper), T1 (Meadowlark), MAB1 (Meadowlark) Meadowlark: TX1 Zone, LCR Civil Work 274 Hours
Continuous		  
19-Jun-26 17:00 03-Dec-27 17:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria) emergency outage due to degraded asset condition 12,769 Hours
Continuous		  
23-Jun-26 10:00 13-Jul-26 17:00 ATCO Outage 743s 701T (743s Sarah Lake) 743S Sarah Lake rebuild - replace 501A solid blade switches, replace surge arrestors 507, 508 487 Hours
Continuous		  
29-Jun-26 10:00 24-Jul-26 17:30 ATCO TE 763s RTU/SCADA (763s Hanna) 602T ITM replacement
, SCADA updates required as part of ITM replacement project		 439.5 Hours
Continuous		  
02-Jul-26 07:00 15-Jul-26 17:00 EPCOR Outage 72LS24 (EP 803s Lambton - Strathcona), S724 (Strathcona), SDS10 (Strathcona) pole 322 Hours
Continuous		  
05-Jul-26 08:00 23-Jul-26 16:00 Syncrude TE Syncrude RTU/SCADA (Syncrude Plant 30-2) replacing an obsolete UPS in 30-2PEB15-2 440 Hours
Continuous		  
06-Jul-26 06:30 15-Jul-26 09:30 ALTALINK Outage 77s 57 (77s Sagitawah) protection upgrade 77s57 219 Hours
Continuous		  
06-Jul-26 06:30 15-Jul-26 09:30 ATCO, ALTALINK RB 9L939 (77s Sagitawah - 809s Louise Creek) Altalink work 219 Hours
Continuous		  
06-Jul-26 07:00 12-Jul-26 17:00 EPCOR Outage 987s T2 (987s Clover Bar), 987s CC721 (987s Clover Bar), 987s C2406 (987s Clover Bar), 987s C2410 (987s Clover Bar) Cloverbar: TX2 doble and CDS1/CDS31/CDS33/CDS43 disconnect maintenance and measurements 154 Hours
Continuous		  
06-Jul-26 07:00 16-Jul-26 17:00 ALTALINK TE 368s RTU/SCADA (368s Burdett) 368s RTU configuration update 250 Hours
Daily		  
06-Jul-26 08:00 15-Jul-26 16:00 ENMAX Outage 35.2TR (SS-35) transformer power factor test, secondary cable test, maintenance, relay fault pressure test, reversing switch check, oil sampling MT, TC 224 Hours
Continuous		  
06-Jul-26 08:00 13-Jul-26 16:00 ENMAX Outage 32.1TR (SS-32) tap changer inspection 32 Hours
Continuous		  
06-Jul-26 08:00 17-Jul-26 16:00 ALTALINK TE 214s Protection & Control (214s Innisfail), 287s Protection & Control (287s Hazelwood), 55s Protection & Control (55s Olds) LTO and transfer tripping settings changes for RAS scheme updates due to the implementation of 475s mobile sub at 55s 272 Hours
Daily		  
06-Jul-26 08:00 17-Jul-26 16:00 ALTALINK TE 214s RTU/SCADA (214s Innisfail) RAS updates due to 55s mobile sub installation 272 Hours
Daily		  
06-Jul-26 08:00 17-Jul-26 16:00 ALTALINK TE 287s RTU/SCADA (287s Hazelwood) changes to RAS scheme due to addition of 55s mobile sub 272 Hours
Daily		  
06-Jul-26 09:00 17-Jul-26 17:00 BCH RB 2L113 (BCH Cranbrook - BCH Natal) hazard tree removals 272 Hours
Continuous		 AB-BC
06-Jul-26 10:00 17-Jul-26 17:30 ATCO Outage 763s 602T (763s Hanna), 763s 507C (763s Hanna), 763s 604 (763s Hanna) 500D1 repair
- 602T ITM replacement
 271.5 Hours
Continuous		  
06-Jul-26 13:00 16-Jul-26 17:00 ALTALINK Outage 761L (38s East Edmonton - 71s Lamoureux), 38s 761N (38s East Edmonton), 71s 552 (71s Lamoureux), 71s 652 (71s Lamoureux), 71s 761W (71s Lamoureux) 38s761N breaker replacement, replace 71s39, maintenance on 71s761W 244 Hours
Continuous		  
06-Jul-26 14:00 16-Jul-26 17:00 ALTALINK TE 38s Protection & Control (38s East Edmonton) 38s761N 138 kV breaker replacement, isolations, protection testing

243 Hours
Continuous		  
07-Jul-26 08:00 13-Jul-26 16:00 ATCO RB 7L10 (754s Ksituan River - 7LA10 tap), 7L10 (730s Rycroft - 7LA10 tap) 7L10 TCM pole replacement (live line ) 152 Hours
Continuous		  
07-Jul-26 08:00 13-Jul-26 16:00 ATCO RB 7L03 (749s Flyingshot Lake - 7L09 tap), 7L03 (731s Elmworth - 7L09 tap) changing red tag poles on 7L03 structures 19, 131 and 132 152 Hours
Continuous		  
09-Jul-26 06:00 15-Jul-26 18:00 SUNCOR Outage 635EDD-1000 635PT-1002 (635EDD-1000), 635EDD-1000 635-752-133 (635EDD-1000), 635EDD-1000 635PS-1041 (635EDD-1000) maintenance on 144 kV and 72 kV equipment 156 Hours
Continuous		  
09-Jul-26 07:00 16-Jul-26 17:00 ALTALINK TE 77s RTU/SCADA (77s Sagitawah) RTU database update 178 Hours
Daily		  
09-Jul-26 14:00 13-Jul-26 15:00 ATCO RB 7L34 (815s Goodfare - 886s Updike) connect 902S mobile 3 - closing jumper J1 1 Hour
Continuous		  
10-Jul-26 08:00 18-Nov-26 16:00 Syncrude Outage 815 (Syncrude Mildred Lake), 816 (Syncrude Mildred Lake) replace 72 kV underground feeder cables on west mine feeder 2,696 Hours
Continuous		  
10-Jul-26 09:00 13-Jul-26 20:00 SUNCOR TE 29PL9-17 (29EDD-1 Millennium - 29EDD-94 Voyageur) 29EDD1 - 29PT419/29PL9-17 system protection isolation only 83 Hours
Continuous		  
10-Jul-26 09:00 12-Jul-26 17:00 BCH RB 5L92 (BCH Cranbrook - BCH Selkirk) 5L92 LLP/ANR - logging beside power lines 134-01 to 136-01 56 Hours
Continuous		 AB-BC
11-Jul-26 07:00 11-Jul-26 12:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 5 Hours
Daily		  
11-Jul-26 07:00 11-Jul-26 11:30 EPCOR Outage 987s CK725 (987s Clover Bar), 72CK12 (987s Clover Bar - Kennedale), K724 (Kennedale) BUS diff upgrade cutovers 4.5 Hours
Continuous		  
11-Jul-26 07:15 11-Jul-26 16:45 ALTALINK Outage 235s 744W (235s Entwistle), 744L (235s Entwistle - 744AL tap) transmission line maintenance 9.5 Hours
Continuous		  
11-Jul-26 12:00 11-Jul-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 5 Hours
Continuous		  
11-Jul-26 12:00 11-Jul-26 17:00 EPCOR Outage 987s CK726 (987s Clover Bar), 72CK13 (987s Clover Bar - Kennedale), K721 (Kennedale) BUS diff upgrade cutovers 5 Hours
Continuous		  
12-Jul-26 06:30 12-Jul-26 12:29 ALTALINK Outage 77s 652 (77s Sagitawah) trip test 77s652 5.98 Hours
Continuous		  
12-Jul-26 07:00 12-Jul-26 11:30 EPCOR Outage 987s GT2 (987s Clover Bar), 987s CGB2 (987s Clover Bar) Cloverbar: GT2/CGB2, bus diff upgrade cutovers 4.5 Hours
Continuous		  
12-Jul-26 08:00 12-Jul-26 16:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 8 Hours
Daily		  
12-Jul-26 12:00 12-Jul-26 17:00 EPCOR Outage 72CN10 (987s Clover Bar - Namao), 987s CN723 (987s Clover Bar) Cloverbar: CN723, BUS Diff Upgrade Cutovers 5 Hours
Continuous		  
12-Jul-26 12:30 12-Jul-26 18:00 ALTALINK Outage 77s 752 (77s Sagitawah) trip test 77s752 5.5 Hours
Continuous		  
13-Jul-26 06:30 13-Jul-26 12:29 ALTALINK Outage 77s 29 (77s Sagitawah) trip test 77s29 5.98 Hours
Continuous		  
13-Jul-26 07:00 19-Jul-26 17:00 EPCOR Outage 72CH11 (987s Clover Bar - EP Hardisty), T1 (EP Hardisty), H722 (EP Hardisty), H725 (EP Hardisty), 987s CH724 (987s Clover Bar), S724 (Strathcona), H723 (EP Hardisty) t1 maintenance and bus diff 154 Hours
Continuous		  
13-Jul-26 07:00 19-Jul-26 17:00 EPCOR Outage EP 803s L2401 (EP 803s Lambton) breaker maintenance 154 Hours
Continuous		  
13-Jul-26 07:00 17-Jul-26 17:00 ALTALINK TE AltaLink Telecom Equipment 2012F fiber relocation for road move 106 Hours
Continuous		  
13-Jul-26 07:00 17-Jul-26 17:00 ALTALINK, EPCOR TE 909L (310p Sundance - 665s Dome) Altalink is relocating 2012F fiber for road move 106 Hours
Continuous		  
13-Jul-26 07:00 17-Jul-26 17:00 ALTALINK, EPCOR TE 1139L (367s Harry Smith - EP Riverview) Altalink is relocating 2012F fiber for road move 106 Hours
Continuous		  
13-Jul-26 07:00 17-Jul-26 17:00 ALTALINK, EPCOR TE 1209L (89s Ellerslie - 330p Genesee) Altalink is relocating 2012F fiber for road move 106 Hours
Continuous		  
13-Jul-26 07:00 17-Jul-26 17:00 ALTALINK, EPCOR TE 1045L (EP 805s Jasper - 1045AL tap) Altalink is relocating 2012F fiber for road move 106 Hours
Continuous		  
13-Jul-26 07:00 24-Jul-26 17:00 ALTALINK, EPCOR TE 909L (310p Sundance - 665s Dome) protection blocking for MPLS cutovers and commissioning 274 Hours
Continuous		  
13-Jul-26 07:00 24-Jul-26 17:00 ALTALINK, EPCOR TE 909L (89s Ellerslie - 665s Dome) protection blocking for MPLS cutovers and commissionin 274 Hours
Continuous		  
13-Jul-26 07:00 13-Jul-26 12:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s29 (breaker fail), no redundancy 5 Hours
Daily		  
13-Jul-26 07:30 16-Jul-26 16:30 ALTALINK, DOW RB 787AL (906s Ross Creek - 787L tap), 787L (166s Dow Chemical Fort Saskatchewan - 787AL tap), 787L (71s Lamoureux - 787AL tap) safety requirement - crew working in vicinity 81 Hours
Continuous		  
13-Jul-26 07:30 17-Jul-26 15:00 CMH Outage CS21 (MHS-2 North Industrial) maintenance on MH69-208. 103.5 Hours
Continuous		  
13-Jul-26 08:00 14-Jul-26 16:30 ALTALINK, ENEL Outage 205s T2 (205s Castle Rock Ridge), 205s 52M2 (205s Castle Rock Ridge), 205s 89T2 (205s Castle Rock Ridge), 205s 89M2 (205s Castle Rock Ridge) maintenance 32.5 Hours
Continuous		  
13-Jul-26 08:00 14-Jul-26 16:00 ENMAX Outage 24B138-24.81 (SS-24), 31B138-24.81 (SS-31) breaker maintenance 32 Hours
Continuous		  
13-Jul-26 08:00 14-Jul-26 16:00 ALTALINK TE 157s RTU/SCADA (157s Lac La Biche) maintenance 32 Hours
Daily		  
13-Jul-26 08:00 24-Jul-26 16:00 ALTALINK TE 310p Protection & Control (310p Sundance) EPCOR MPLS upgrade
272 Hours
Continuous		  
13-Jul-26 08:00 24-Jul-26 16:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) EPCOR MPLS upgrade 272 Hours
Continuous		  
13-Jul-26 08:00 16-Jul-26 16:00 ENMAX Outage 13.3TR (SS-13) transformer testing 80 Hours
Continuous		  
13-Jul-26 08:00 15-Jul-26 16:00 ENMAX Outage 31.3TR (SS-31) relay protection test 56 Hours
Continuous		  
13-Jul-26 08:00 14-Jul-26 16:00 ENMAX Outage 39.2TR (SS-39) CT testing 32 Hours
Continuous		  
13-Jul-26 08:00 16-Jul-26 16:00 ENMAX Outage 3.82L (SS-3 - SS-8), 3.3TR (SS-3), 3B138-3.82 (SS-3), SW83 (SS-3), 3MD138-3.3TR (SS-3) tap changer inspection 80 Hours
Continuous		  
13-Jul-26 09:00 24-Jul-26 17:30 ATCO Outage 2075s 901T (2075s Newell), 2075s 917 (2075s Newell), 2075s 918 (2075s Newell), 2075s ACF11 (2075s Newell), 2075s ACF12 (2075s Newell), 2075s ACF13 (2075s Newell), 2075s ACF14 (2075s Newell), 2075s ACF1D1 (2075s Newell) SVC Newell maintenance 272.5 Hours
Continuous		  
13-Jul-26 09:00 14-Jul-26 18:00 ALTALINK Outage 76L (33s Spray - 115s Mount Allan) tower repair work and insulation change on 33s A frame 33 Hours
Continuous		  
13-Jul-26 10:00 13-Jul-26 13:00 SUNCOR Outage 29EDD-1 952-104 (29EDD-1 Millennium) prc testing
 156 Hours
Continuous		  
13-Jul-26 10:00 14-Jul-26 16:00 ATCO Outage 825s 903 (825s Whitefish Lake) breaker maintenance 30 Hours
Continuous		  
13-Jul-26 10:00 16-Jul-26 16:00 ATCO Outage 918s 702T (918s Bauer), 918s 702 (918s Bauer) transformer and breaker maintenance 78 Hours
Continuous		  
13-Jul-26 10:00 14-Jul-26 16:00 ATCO Outage 856s 902 (856s Kinosis) PRC-005 test and breaker maintenance 30 Hours
Continuous		  
13-Jul-26 10:00 17-Jul-26 17:30 ALTALINK RB 472AL (221s Sunken Lake - 472L tap), 472L (213s Hughenden - 472AL tap), 472L (648s Metiskow - 472AL tap) 472L 204, 208, 241, 245, 343, 358, 367, replace arms and glass, replace structure 241 103.5 Hours
Continuous		  
13-Jul-26 10:00 16-Jul-26 16:00 ATCO TE 918s RTU/SCADA (918s Bauer) In conjunction with 1-00519538. 918s RTU outage 10-20 min to push new config file. 78 Hours
Continuous		  
13-Jul-26 12:00 17-Jul-26 16:00 ATCO Outage 6L12 (774s Monitor - 6L25 tap), 774s 601 (774s Monitor), 774s 6L12D5 (774s Monitor), 774s 601A (774s Monitor) road rebuild structure replacements 100 Hours
Continuous		  
13-Jul-26 12:00 14-Jul-26 16:00 ALTALINK TE 723s RTU/SCADA (723s Christina Lake) HMI replacement 28 Hours
Daily		  
13-Jul-26 12:30 13-Jul-26 18:00 ALTALINK Outage 77s 40 (77s Sagitawah) trip test 77s40 5.5 Hours
Continuous		  
13-Jul-26 12:30 13-Jul-26 18:00 ATCO, ALTALINK RB 9L938 (77s Sagitawah - 809s Louise Creek) reclosing blocked for AltaLink 5.5 Hours
Continuous		  
13-Jul-26 13:00 16-Jul-26 15:00 ATCO RB 7L85 (801s Anderson - ATC 803s Bullpound), 7L85 (803s ATC Bullpound - 7LA85 tap), 7L85 (804s Wintering Hills - 7LA85 tap) installing interphase spacers on 7L85 - live line work 74 Hours
Continuous		  
13-Jul-26 13:01 13-Jul-26 16:00 SUNCOR Outage 29EDD-1 952-105 (29EDD-1 Millennium) prc-5 testing 2.98 Hours
Continuous		  
14-Jul-26 07:00 14-Jul-26 13:00 ALTALINK Outage 658L (562s Cypress - 658AL tap), 658L (649s Chappice Lake - 658AL tap), 562s 1452 (562s Cypress), 562s 1652 (562s Cypress) replacing insulator on structure 306 6 Hours
Continuous		  
14-Jul-26 07:00 14-Jul-26 17:00 ALTALINK TE 77s 37 (77s Sagitawah) test the functionality of clearing the 240kV East Bus 10 Hours
Continuous		  
14-Jul-26 07:00 14-Jul-26 08:30 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 1.5 Hours
Continuous		  
14-Jul-26 07:00 14-Jul-26 17:00 ALTALINK Outage 724L (500s Flatbush - 724L tap), 724L (723L tap - 724AL tap) repair damaged cross-arms on structures 724L 47 & 64 10 Hours
Continuous		  
14-Jul-26 07:00 14-Jul-26 11:30 EPCOR Outage 987s CCP7214 (987s Clover Bar) Clover Bar CCP7214 - bus diff upgrade cutovers 4.5 Hours
Continuous		  
14-Jul-26 07:00 14-Jul-26 19:00 ALTALINK, PR Outage 275s 949 (275s Jenner), 949L (275s Jenner - 306s Halsbury), 306s 240MDS4 (306s Halsbury), 306s 240CB1 (306s Halsbury), 306s 240MDS1 (306s Halsbury), 306s 240MDS2 (306s Halsbury), 306s 240MDS3 (306s Halsbury), 306s 35CB1 (306s Halsbury), 306s 35CB2 (306s Halsbury), 306s 35CB3 (306s Halsbury), 306s 35CB4 (306s Halsbury), 306s 35CB6 (306s Halsbury), 306s 35CB7 (306s Halsbury), 306s 35CB8 (306s Halsbury), 306s 35CB11 (306s Halsbury), 306s 35CB12 (306s Halsbury), 306s 35CB13 (306s Halsbury), 306s 35CB14 (306s Halsbury) customer work on 949L 12 Hours
Continuous		  
14-Jul-26 07:00 14-Jul-26 08:00 ALTALINK Outage 723L (69s North Barrhead - 724L tap), 723L (438s Westlock - 724L tap) switching off 723L to prep 724L outage 1 Hour
Continuous		  
14-Jul-26 08:00 14-Jul-26 11:00 ATCO Outage 7L172 (739s Edith Lake - 743s Sarah Lake), 739s 702 (739s Edith Lake), 743s 704 (743s Sarah Lake) PRC-005 - trip coil testing - breaker 704 @ 743s and breaker 702 @ 739s 3 Hours
Continuous		  
14-Jul-26 08:00 14-Jul-26 16:00 ALTALINK TE 104s RTU/SCADA (104s Watson Creek) split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Continuous		  
14-Jul-26 08:00 01-Oct-26 17:00 ALTALINK IO 287s 552 (287s Hazelwood) 287s552 must be open during 443L and 417L outage for the 214s AIS to work properly 1,905 Hours
Continuous		  
14-Jul-26 08:00 14-Jul-26 12:00 ALTALINK TE 394s Protection & Control (394s Empress) protection outage A77/1134_AIS and B77/1134_AIS, required for 658L outage 4 Hours
Continuous		  
14-Jul-26 08:00 14-Jul-26 16:00 ALTALINK TE AML 793s Protection & Control (AML 793s Horse Creek) techs to complete standard maintenance T1 relays 8 Hours
Continuous		  
14-Jul-26 08:00 15-Jul-26 17:00 ALTALINK TE AltaLink Telecom Equipment 67s Stirling-225s Magrath MW upgrades 33 Hours
Continuous		  
14-Jul-26 08:31 14-Jul-26 10:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 1.48 Hours
Continuous		  
14-Jul-26 09:00 14-Jul-26 16:00 ATCO TE ATCO Telecom Equipment Weberville_T-Telecom/Wesley Creek_S-Telecom - IRU radio majors 7 Hours
Continuous		  
14-Jul-26 09:00 15-Jul-26 14:00 ALTALINK Outage 214s 443 (214s Innisfail), 55s 443 (55S Olds), 443L (55s Olds - 214s Innisfail), 287s 552 (287s Hazelwood) create open point 'D', connect 475s mobile 29 Hours
Continuous		  
14-Jul-26 09:00 14-Jul-26 16:00 ATCO TE ATCO Telecom Equipment Clairmont Lake_S_Telecom/Crystal Lake_S-Telecom- IUR radio major PM 7 Hours
Continuous		  
14-Jul-26 09:00 15-Jul-26 14:00 ALTALINK Outage 55s T2 (55s Olds), 55s 51 (55s Olds) connect 475s mobile 29 Hours
Continuous		  
14-Jul-26 09:30 23-Jul-26 11:00 ALTALINK Outage 163s T5 (163s Amoco Empress) 163sT5 maintenance and oil leaks 217.5 Hours
Continuous		  
14-Jul-26 10:00 14-Jul-26 12:00 ATCO TE ATCO Telecom Equipment strategic fiber project
 2 Hours
Continuous		  
14-Jul-26 10:01 14-Jul-26 11:30 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 1.48 Hours
Continuous		  
14-Jul-26 11:01 14-Jul-26 15:00 ATCO Outage 739s 701 (739s Edith Lake), 7L43 (739s Edith Lake - 809s Louise Creek), 7L43-Pseudo (809s Louise Creek) PRC-005 - trip coil testing - breaker 701 @ 739s - breaker operation only - open-close-open-close 3.98 Hours
Continuous		  
14-Jul-26 11:31 14-Jul-26 13:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 1.48 Hours
Continuous		  
14-Jul-26 12:00 20-Jul-26 10:00 ATCO Outage 886s 701T (886s Updike) transformer and breaker testing, mobile sub will be carrying all the load 166 Hours
Continuous		  
14-Jul-26 12:00 14-Jul-26 17:00 EPCOR Outage 987s CS2 (987s Clover Bar), 987s SST2 (987s Clover Bar) Clover Bar SST2/CS2 - bus diff upgrade cutovers 5 Hours
Continuous		  
14-Jul-26 13:00 17-Jul-26 13:00 ATCO Outage 783s 701T (783s Cadotte River), 783s 701TD (783s Cadotte River) 783S 144kV fuse replacement
, 783s 701T transformer class 2 major testing		 72 Hours
Continuous		  
14-Jul-26 13:01 14-Jul-26 14:30 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 1.48 Hours
Continuous		  
14-Jul-26 14:31 14-Jul-26 16:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57 1.48 Hours
Continuous		  
14-Jul-26 16:30 14-Jul-26 17:00 ALTALINK Outage 723L (69s North Barrhead - 724L tap), 723L (438s Westlock - 724L tap) switching off 723L to prep the return of 724L repair 0.5 Hours
Continuous		  
15-Jul-26 07:00 16-Jul-26 17:00 ALTALINK, TRANSALTA RB 179s 733 (179s Gleichen), 428s 733X (428s Namaka), 733L (179s Gleichen - 428s Namaka) 733L str. 161-211 prep. Live line work. 34 Hours
Daily		  
15-Jul-26 07:00 16-Jul-26 17:00 ALTALINK RB 151s 733E (151s Strathmore), 428s 733N (428s Namaka), 733L (151s Strathmore - 428S Namaka) 733L 131 Top Phase Keeper Key. Live Line. 34 Hours
Daily		  
15-Jul-26 07:00 15-Jul-26 11:30 EPCOR Outage 987s GT1 (987s Clover Bar), 987s CGB1 (987s Clover Bar) bus differential upgrade cutovers 4.5 Hours
Continuous		  
15-Jul-26 07:00 15-Jul-26 17:00 ENMAX, ALTALINK IO 1064L (74s Janet - 102s Langdon) ENMAX - shield wire replacement 10 Hours
Continuous		  
15-Jul-26 07:00 15-Jul-26 17:00 ENMAX, ALTALINK IO 1065L (74s Janet - 102s Langdon) ENMAX shield wire replacement 10 Hours
Continuous		  
15-Jul-26 07:30 16-Jul-26 16:00 ALTALINK, ENEL Outage 205s T1 (205s Castle Rock Ridge), 205s 89T1 (205s Castle Rock Ridge) two day outage required for 205s planned maintenance 32.5 Hours
Continuous		  
15-Jul-26 08:00 19-Jul-26 12:59 SUNCOR Outage 29EDD-1 29EDD1s452 (29EDD-1 Millennium) maintenance and test 156 Hours
Continuous		  
15-Jul-26 08:00 15-Jul-26 16:00 ENMAX, ALTALINK Outage 1064L (74s Janet - 102s Langdon), 1065L (74s Janet - 102s Langdon) shield wire replacement 8 Hours
Continuous		  
15-Jul-26 08:00 15-Jul-26 16:00 ENMAX, ALTALINK IO 1065L (74s Janet - 102s Langdon) shield wire replacement 8 Hours
Continuous		  
15-Jul-26 08:00 15-Jul-26 17:00 ALTALINK TE 39s RTU/SCADA (39s Bickerdike), AltaLink Telecom Equipment firmware upgrade an A&B Nodes. firewall upgrade. SCADA Upgrade 9 Hours
Continuous		  
15-Jul-26 08:00 16-Jul-26 16:00 ENMAX Outage 21.61L (SS-21 - SS-34), 34B69-21.61 (SS-34), 21B69-21.61 (SS-21) hv breaker maintenance 32 Hours
Continuous		  
15-Jul-26 08:00 15-Jul-26 16:00 ALTALINK Outage 113L (20s Ghost - 33s Spray), 20s 113 (20s Ghost), 33s 113 (33s Spray) replacing insulator on structure 77 8 Hours
Continuous		  
15-Jul-26 08:00 15-Jul-26 16:00 ALTALINK, CapitalPower TE 1018s Protection & Control (1018s Shamrock) temporary isolated the listed protections for customer request, 1148L A87/21/L1 SEL411L - FT 99-3,1148L B87/21/L1 URL90 - FT 99-5 8 Hours
Continuous		  
15-Jul-26 08:00 16-Jul-26 16:00 ENMAX Outage 40.1TR (SS-40) secondary cabinet measurements and CT testing 32 Hours
Continuous		  
15-Jul-26 08:00 16-Jul-26 14:30 ALTALINK Outage 62s T1 (62s Brazeau Plant), 62s 1 (62s Brazeau Plant) customer to balance BR1 motor 30.5 Hours
Daily		  
15-Jul-26 08:30 15-Jul-26 17:30 ATCO, ALTALINK RB 9L939 (77s Sagitawah - 809s Louise Creek) reclosing blocked for AltaLink 9 Hours
Continuous		  
15-Jul-26 08:30 15-Jul-26 16:30 ALTALINK Outage 77s 54 (77s Sagitawah) trip test 77s54 8 Hours
Continuous		  
15-Jul-26 09:00 16-Jul-26 16:00 ATCO, ALTALINK TE ATCO Telecom Equipment, 9L960 (13s Deerland - 825s Whitefish Lake), 9L961 (13s Deerland - 825s Whitefish Lake), 825s Whitefish Lake capacity & reliability upgrades. changing radio through put on link Whitefish to Harry Hill, link will be down for the duration of the outage
, impacts
TPRCP146 / 9L960A
TPRCP147 / 9L961A		 7 Hours
Continuous		  
15-Jul-26 09:00 15-Jul-26 16:00 ATCO TE ATCO Telecom Equipment, 7L228 (845s Big Mountain - 7L20 tap) debolt_t-telecom- IRU radio major pm impact to the following traffic during radio outage:
TPRNN007 / 7L228 A - and TPRNN012 / 7L228 B - Thornton/ Big mountain
 7 Hours
Continuous		  
15-Jul-26 09:00 19-Jul-26 17:00 ATCO, SUNCOR TE 29PL9-1 (29EDD-1 Millennium - 848s Ruth Lake) pm 5y,10y protection only 104 Hours
Continuous		  
15-Jul-26 09:00 15-Jul-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s57. Breaker fail protection, no redundancy 8 Hours
Continuous		  
15-Jul-26 09:00 15-Jul-26 17:00 ALTALINK Outage 198s T2 (198s Blackfalds) replace failed qualitrol 930 boards 8 Hours
Daily		  
15-Jul-26 10:00 16-Jul-26 16:00 ATCO Outage 825s 904 (825s Whitefish Lake) breaker maintenance 30 Hours
Continuous		  
15-Jul-26 10:00 16-Jul-26 16:00 ATCO Outage 856s 904 (856s Kinosis) trip coil testing, breaker maintenance 30 Hours
Continuous		  
15-Jul-26 11:00 27-Jul-26 16:00 ATCO, ALTALINK Outage 6L126 (743s Sarah Lake - 515L tap), 743s 601 (743s Sarah Lake) 743S Sarah lake rebuild. Replace breaker 601 317 Hours
Continuous		  
15-Jul-26 14:00 05-Oct-26 09:00 ALTALINK Outage 417L (55s Olds - 281s Johnson), 55s T1 (55s Olds), 55s T2 (55s Olds), 55s 417 (55S Olds), 287s 552 (287s Hazelwood), 55s 2 (55s Olds) mobile install at 55s for P_C major upgrade, repair/replace s80, s83, s84. salvage s51. 1,963 Hours
Continuous		  
16-Jul-26 07:00 16-Jul-26 17:00 ALTALINK RB 600L (404s Peace Butte - 523s Bullshead) 600L str 30, 102, 131, re-install keeper key top right phase - live line work 9 Hours
Continuous		  
16-Jul-26 07:00 21-Jul-26 17:00 SUNCOR Outage 635EDD-1000 635PK-1000 (635EDD-1000), 635EDD-1000 635-752-132 (635EDD-1000), 635EDD-1000 635-752-131 (635EDD-1000), 635EDD-1000 635PS-1017 (635EDD-1000), 635EDD-1000 635PS-1018 (635EDD-1000), 635EDD-1000 635PS-1040 (635EDD-1000), 635EDD-1000 635PS-1016 (635EDD-1000) 6 year planned maintenance on 144kV equipment 130 Hours
Continuous		  
16-Jul-26 08:00 16-Jul-26 16:00 ENMAX TE Protection & Control (SS-23) 23sub zone 31 138kV bus differential, 86-Z31 lockout relay protection outage 8 Hours
Continuous		  
16-Jul-26 08:30 16-Jul-26 16:00 ALTALINK Outage 256s C1 (256s Harmattan) PRC maintenance on the cap bank protection 7.5 Hours
Continuous		  
16-Jul-26 08:30 16-Jul-26 16:00 ALTALINK TE 256s Protection & Control (256s Harmattan) PRC maintenance 7.5 Hours
Continuous		  
16-Jul-26 09:00 16-Jul-26 16:00 ATCO TE ATCO Telecom Equipment, 2091s RTU/SCADA (2091s Thornton) Smoky River_T-Telecom-MDR Radio 7 Hours
Continuous		  
16-Jul-26 09:30 16-Jul-26 12:30 ALTALINK Outage 38s C1 (38s East Edmonton), 38s C2 (38s East Edmonton) cap bank weed spraying 3 Hours
Continuous		  
16-Jul-26 10:00 16-Jul-26 14:00 ALTALINK TE 178s RTU/SCADA (178s Cynthia), 359s RTU/SCADA (359s Esso West Pembina), AltaLink Telecom Equipment Firewall upgrade with a switch changeout. MPLS Node Firmware upgrade as well, SCADA VLAN Config.
4 Hours
Daily		  
16-Jul-26 15:00 16-Jul-26 17:00 ALTALINK Trans Test 157s 852 (157s Lac La Biche) multiple breaker operations required to sync POW controller 2 Hours
Continuous		  
17-Jul-26 06:00 18-Jul-26 18:00 ALTALINK Outage 42s 3W (42s Sarcee), 3L (42s Sarcee - 272s Springbank) replacing cross arms and insulators on structures 373, 387, & 390

36 Hours
Continuous		  
17-Jul-26 08:00 17-Jul-26 16:00 ALTALINK TE 86s RTU/SCADA (86s Bigstone) split the existing SCADA VLAN from 1 to 1 and 2
8 Hours
Continuous		  
17-Jul-26 08:00 17-Jul-26 18:00 ENMAX Outage 14.1C (SS-14), 14.2C (SS-14), 14.83L (SS-14 - SS-36), 14.4TR (SS-14), 14.2TR (SS-14), SW84 (SS-14), 14B138-14.83 (SS-14), 14MD138-14.4TR (SS-14), 14MD138-14.2TR (SS-14), 36B138-14.83 (SS-36) power factor test, reversing switch check and oil sampling 10 Hours
Continuous		  
17-Jul-26 09:00 17-Jul-26 11:00 BCH Outage 2L293 (BCH Nelway - BCH Selkirk) 2CT2 energization 2 Hours
Continuous		 AB-BC
17-Jul-26 10:00 20-Jul-26 14:00 ATCO RB 6L56 (763s Hanna - 802s Michichi Creek) climbing inspection on 6L56 between Hanna and Michichi 76 Hours
Continuous		  
17-Jul-26 10:00 17-Jul-26 14:00 ALTALINK Outage 252s T2 (252s Jarrow) install T2 transformer grounding 4 Hours
Continuous		  
17-Jul-26 11:00 25-Jul-26 15:30 ALTALINK Outage 526s 652 (526s Buffalo Creek), 526s C1 (526s Buffalo Creek) replace 526s652 breaker 196.5 Hours
Continuous		  

Prepared On:   2026-07-10   14:41:43

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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