Alberta Electric System Operator
System Co-ordination Plan
2026-10-31 to 2026-11-06
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
26-Jul-24 10:00 30-Jun-27 16:00 ATCO Outage 826s 504R (826s Marguerite Lake) emergency removal to replace failed 502R @834S 25,662 Hours
Continuous		  
20-Mar-25 08:00 04-Nov-26 09:59 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 14,257.98 Hours
Continuous		  
27-Nov-25 08:30 27-Nov-27 17:30 ALTALINK TE 89s Protection & Control (89s Ellerslie) DSP card replacements on1057L B87/L3 and B240B1 B87/240B1 17,528 Hours
Daily		  
06-Mar-26 17:00 13-Nov-26 18:00 EPCOR Outage T1 (Woodcroft) woodcroft: TX1 LCR civil 6,048 Hours
Continuous		  
10-Mar-26 10:00 30-Nov-26 18:00 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		  
01-May-26 17:00 19-Feb-27 18:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 4,993 Hours
Continuous		  
04-Jun-26 07:01 10-Feb-27 18:00 EPCOR Outage T1 (Rossdale) rossdale: TX1 lcr civil 6,034.98 Hours
Continuous		  
07-Jun-26 17:05 03-Nov-26 19:00 ACCIONA, ENBRIDGE, ICPCL Outage 139s C1 (139s Hillridge) forced outage 3,577.92 Hours
Continuous		  
08-Jun-26 07:00 15-Jan-27 18:00 EPCOR TE EP 511s Protection & Control (EP 511s Victoria) 72kV breaker fail protection blocking 2,626 Hours
Continuous		  
15-Jun-26 07:00 19-Mar-27 17:00 EPCOR TE 805s Protection & Control (805s Jasper) protection blocking, breaker replacement project 1,954 Hours
Continuous		  
19-Jun-26 17:00 01-May-27 17:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria) emergency outage due to degraded asset condition 12,769 Hours
Continuous		  
20-Jul-26 07:00 31-Dec-26 18:00 EPCOR TE Protection & Control (Woodcroft) woodcroft: protection blocking for TX1 LCR, line protection testing, and repairs 3,947 Hours
Continuous		  
02-Sep-26 07:00 11-Nov-26 15:00 ALTALINK, TRANSALTA Outage 320p GT3 (320p Keephills) maintenance 1,184 Hours
Continuous		  
08-Sep-26 07:00 18-Dec-26 18:00 EPCOR TE EP 803s Protection & Control (EP 803s Lambton) protection blocking, DFR upgrade cutovers and commissioning 2,435 Hours
Continuous		  
08-Sep-26 08:00 13-Nov-26 18:00 ALTALINK, REDDEER Outage 464L (87s Gaetz - 209s Timberlands), 209s 464E (209s Timberlands) P&C panel replacements, 138 kV bus and line arrestor testing, transformer testing 1,594 Hours
Continuous		  
08-Sep-26 09:00 13-Nov-26 18:00 ALTALINK, REDDEER Outage 768L (209s Timberlands - 217s North Red Deer), 209s T1 (209s Timberlands), 217s 768 (217s North Red Deer), 209s 768W (209s Timberlands) P&C panel replacements, 138 kV bus and line arrestor testing, transformer testing 1,593 Hours
Continuous		  
12-Sep-26 08:00 27-Nov-26 17:00 SUNCOR Outage 29EDD-18 29PT-100 (29EDD-18 Firebag) replace secondary cables on 29PT-100 1,833 Hours
Continuous		  
14-Sep-26 08:00 17-Dec-26 18:00 ATCO TE 738s RTU/SCADA (738s Virginia Hills), 738s Protection & Control (738s Virginia Hills) SCADA/protection upgrade at 738s Virginia Hills, cut over to the new SCADA system and tested 2,266 Hours
Continuous		  
14-Sep-26 21:53 31-Dec-26 23:59 NWE Outage 2375 (NWE Marias) breaker hydraulic oil pump repeatedly 2,595.1 Hours
Continuous		 AB-MATL
15-Sep-26 11:00 05-Nov-26 20:00 ATCO TE 888s RTU/SCADA (888s Dover) RTU updates for 9L74 protection upgrade 1,233 Hours
Continuous		  
21-Sep-26 10:00 27-Nov-26 14:00 ATCO Outage 706s 701T (706s Irish Creek), 706s 701 (706s Irish Creek) breaker, transformer and voltage regulator maintenance 268 Hours
Continuous		  
28-Sep-26 07:00 31-Dec-26 18:00 EPCOR Outage 816s T1 (816s Petrolia) emergency outage - tap changer gassing 2,267 Hours
Continuous		  
04-Oct-26 12:00 06-Nov-26 19:00 ENMAX Outage 8.6TR (SS-8) fire alarm system upgrade 799 Hours
Continuous		  
05-Oct-26 08:00 28-Nov-26 20:00 ALTALINK Outage 62s T2 (62s Brazeau Plant), 62s 2 (62s Brazeau Plant) maintenance 1,295 Hours
Continuous		  
11-Oct-26 08:00 23-Nov-26 17:00 ENMAX Outage 32.1TR (SS-32) oil containment replacement 1,041 Hours
Continuous		  
12-Oct-26 07:00 05-Nov-26 19:00 ALTALINK TE 304s RTU/SCADA (304s Shell Limestone) RTU configuration update 588 Hours
Daily		  
13-Oct-26 09:00 18-Dec-26 19:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe), 235s 799N (235s Entwistle) rebuild structure and restring OPGW 1,594 Hours
Continuous		  
15-Oct-26 08:00 16-Nov-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV Bus. pull in 25kV feeder cables. ground 25kV Bus 368 Hours
Continuous		  
16-Oct-26 08:00 05-Nov-26 18:00 ATCO, ALTALINK RB 12L41 (510s Sunnybrook - 939s Livock) installing replacement corona rings on 12L41 due to failure 490 Hours
Continuous		  
16-Oct-26 08:00 05-Nov-26 18:00 ATCO, ALTALINK RB 12L41 (510s Sunnybrook - 939s Livock) installing replacement corona rings on 12L41 due to failure 490 Hours
Daily		  
18-Oct-26 16:00 09-Nov-26 15:00 ALTALINK IO 38s T8 (38s East Edmonton), 38s 4852 (38s East Edmonton) T8 install, close 38s open point G 527 Hours
Continuous		  
19-Oct-26 13:00 04-Nov-26 17:00 ALTALINK Outage 62s T2 (62s Brazeau Plant), 62s 2 (62s Brazeau Plant) breaker maintenance 388 Hours
Daily		  
19-Oct-26 16:01 04-Nov-26 17:00 ATCO Outage 7L12 (834s Wesley Creek - 7LA12 tap), 834s 710 (834s Wesley Creek), 834s 704 (834s Wesley Creek) changing the entire structure plus the switch 7L12D2 384.98 Hours
Continuous		  
21-Oct-26 08:00 09-Nov-26 17:00 Syncrude Outage T1 (Aurora), 260kV Bus 1 (Aurora), 211 (Aurora), 221 (Aurora), 72 kV Bus 1 (Aurora), 89-210 (Aurora), 21 (Aurora), 31 (Aurora), 11 (Aurora), 89-51 (Aurora) 6yr pm 345 Hours
Continuous		  
21-Oct-26 08:00 09-Nov-26 17:00 Syncrude Outage UT2 (Aurora), 22 (Aurora), 21 (Aurora), 89-25 (Aurora) zone 9 6yr pm 417 Hours
Continuous		  
21-Oct-26 12:00 02-Nov-26 16:00 ATCO Outage 850s 701T (850s Rainbow Cogen), 850s 433 (850s Rainbow Co-Gen) maintenance 215 Hours
Continuous		  
21-Oct-26 12:00 30-Nov-26 17:00 ALTALINK, Lethbridge RB 725LW (674s Bowron - 725BL tap), 725LE (674s Bowron - 725AL tap) ongoing CVT issue and the transient voltages observed at the relays (forced) 965 Hours
Continuous		  
22-Oct-26 13:00 31-Dec-27 18:00 ALTALINK, Keyera Cynthia Outage 359s T2 (359s Esso West Pembina), 359s 14 (359s Esso West Pembina) T2 maintenance 10,445 Hours
Continuous		  
26-Oct-26 04:00 11-Dec-26 18:00 EPCOR Outage 814s T2 (814s Bellamy), BR722 (Rossdale), 814s B2402 (814s Bellamy), 814s B2406 (814s Bellamy), R721 (Rossdale), RR723 (Rossdale), 814s BAB2 (814s Bellamy) Bellamy: TX2 emergency bushing replacement and rossdale TX1 installation 1,283 Hours
Continuous		  
26-Oct-26 07:00 18-Dec-26 18:00 EPCOR Outage 805s T3 (805s Jasper), EP 805s J2404 (EP 805s Jasper), EP 805s J2405 (EP 805s Jasper), EP 805s JAB3 (EP 805s Jasper) Jasper: J2404/JAB3/JDS9 replacement LCR 1,283 Hours
Continuous		  
26-Oct-26 07:00 31-Oct-26 17:00 ALTALINK, EPCOR Outage 909L (89s Ellerslie - 665s Dome), 72DS26 (665s Dome - Strathcona), 665s D2401 (665s Dome), 665s D2404 (665s Dome), 665s DDS13 (665s Dome), 665s DAB3 (665s Dome) 909LE/Dome: Dome CVT LCR and 909LE metering upgrade 106 Hours
Continuous		  
26-Oct-26 08:00 04-Nov-26 17:00 ATCO RB 7L12 (834s Wesley Creek - 7LA12 tap), 7L12 (780s Lubicon - 7LA12 tap) taking openers J1 and J2 off the line after replacing both switches 7L12D2 and 7L12D3 225 Hours
Continuous		  
26-Oct-26 08:00 13-Nov-26 18:00 ATCO Outage 806s 701T (806s Oldman River), 806s 152 (806s Oldman River), 806S 52-1 (806s Oldman River), 806S 52-2 (806s Oldman River), 806S 89AS (806s Oldman River) telecommunications upgrade 442 Hours
Continuous		  
26-Oct-26 08:00 13-Nov-26 18:00 ATCO TE 806s RTU/SCADA (806s Oldman River), 806s Protection & Control (806s Oldman River) telecommunications upgrade, new UPS upgrades SCADA will be down most of the time as well 442 Hours
Continuous		  
26-Oct-26 08:00 05-Nov-26 17:00 ALTALINK TE 562s Protection & Control (562s Cypress) protection outages to implement/test fault reporting settings changes 249 Hours
Daily		  
26-Oct-26 08:00 05-Nov-26 17:00 ALTALINK TE 562s RTU/SCADA (562s Cypress) RTU outage to implement fault reporting settings changes 249 Hours
Daily		  
26-Oct-26 08:00 05-Nov-26 17:00 ALTALINK TE 194s RTU/SCADA (194s South Red Deer) 194s SCADA equipment upgrade 249 Hours
Daily		  
26-Oct-26 08:00 06-Nov-26 15:00 CMH TE MH-60L (MHS-5 NE Crescent Heights - MHS-7 Brier Park) maintenance on the relay LDR-60L-A at Northeast Crescent Heights (NECH) substation 271 Hours
Continuous		  
26-Oct-26 08:00 13-Nov-26 17:00 ALTALINK TE 312s Protection & Control (312s Fidler) ATCO is performing a UPS swap at 806s 441 Hours
Continuous		  
26-Oct-26 08:00 03-Nov-26 17:00 ENMAX Outage 7.1TR (SS-7) 7 sub Z11 bus diff replacement 225 Hours
Continuous		  
26-Oct-26 11:00 04-Nov-26 12:00 ALTALINK Outage 163s 1252 (163s Amoco Empress) breaker failure & control protection upgrade 217 Hours
Continuous		  
27-Oct-26 10:00 03-Nov-26 17:00 ATCO TE 939s RTU/SCADA (939s Livock), 939s Protection & Control (939s Livock) relay software vulnerability patching 175 Hours
Continuous		  
28-Oct-26 08:00 04-Nov-26 23:00 SUNCOR Outage 29EDD-2 29PT-2 (29EDD-2 Tar Island), 29PL6-6 (29EDD-1 Millennium - 29EDD-2 Tar Island), 29EDD-2 29PS-5 (29EDD-2 Tar Island) repair leaking bushings, OLTC SCADA/field tap position, setpoint change 183 Hours
Continuous		  
28-Oct-26 08:00 06-Nov-26 17:00 SUNCOR TE 29EDD-34 RTU/SCADA (29EDD-34), 29EDD-1 RTU/SCADA (29EDD-1 Millennium) change few setting/ parameter configuration for Alberta DST changes and download again 57 Hours
Continuous		  
28-Oct-26 09:00 10-Nov-26 20:00 SUNCOR Outage 29EDD-34 260kV Bus 29PP-45 (29EDD-34), 29EDD-34 29-952-113 (29EDD-34), 29EDD-34 29-952-123 (29EDD-34), 29EDD-34 29-952-143 (29EDD-34), 29EDD-34 29-952-133 (29EDD-34) 29EDD34 29PP45 A,C phase rebuild bus and supports that were removed as part of the 29PT-224 outage.
 155 Hours
Continuous		  
29-Oct-26 00:00 03-Nov-26 12:00 ALTALINK Outage 1182s C1 (1182s Berland River) 1182s Berland River capacitor C1 forced outage 132 Hours
Continuous		  
29-Oct-26 08:00 31-Oct-26 18:00 ALTALINK Outage 927L (102s Langdon - 356s Milo) 927L - (urgent repair) replace 2 Interphase spacers in span 188 58 Hours
Continuous		  
29-Oct-26 08:00 31-Oct-26 18:00 ALTALINK RB 924L (102s Langdon - 356s Milo) proximity for work on 927L 58 Hours
Daily		  
30-Oct-26 08:00 31-Oct-26 16:00 ALTALINK TE AML 511s RTU/SCADA (AML 511s Crossings), AltaLink Telecom Equipment add intrusion alarms 32 Hours
Daily		  
31-Oct-26 08:00 31-Oct-26 16:00 ENMAX, ALTALINK Outage 47.2TR (SS-47), 47B138-BT3 (SS-47), 47B138-771 (SS-47), 47MD138-47.2TR (SS-47) 47MD138-47.2TR \center phase not flat 8 Hours
Continuous		  
01-Nov-26 09:00 14-Nov-26 17:00 ENMAX TE Protection & Control (SS-37) 37 sub auto switching protection scheme outage, 37 sub switch replacements, settings upgrade 320 Hours
Daily		  
01-Nov-26 09:30 14-Nov-26 17:00 ENMAX, ALTALINK Outage 37.82L (74s Janet - SS-37), 37.2TR (SS-37), 74s 37.82W (74s Janet), 37B138-37.82 (SS-37), 37B138-BT5 (SS-37) maintenance 293.5 Hours
Continuous		  
01-Nov-26 09:30 14-Nov-26 17:00 ENMAX, ALTALINK Outage 37.82L (74s Janet - SS-37), 74s 37.82W (74s Janet) ENMAX Work - HV SW replacement. 37SW85, 37SW86, 37SW89 322 Hours
Continuous		  
02-Nov-26 08:00 13-Nov-26 18:00 ALTALINK, EPCOR Outage 909L (310p Sundance - 665s Dome), 665s D2403 (665s Dome), 310p 1352 (310p Sundance), 310p 1452 (310p Sundance), 665s DDS14 (665s Dome) metering upgrade cutovers and commissioning 274 Hours
Continuous		  
02-Nov-26 08:00 06-Nov-26 18:00 EPCOR Outage EP 803s T2 (EP 803s Lambton), EP 803s L2402 (EP 803s Lambton), EP 803s L2405 (EP 803s Lambton) TX2 zone, DFR cutovers and commissioning 106 Hours
Continuous		  
02-Nov-26 08:00 12-Nov-26 18:00 ALTALINK TE 353s RTU/SCADA (353s Plamondon) RTU outage for sublan upgrade project 250 Hours
Daily		  
02-Nov-26 08:00 07-Nov-26 18:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria), EP 511s V724 (EP 511s Victoria), EP 511s V725 (EP 511s Victoria), EP 511s VAB3 (EP 511s Victoria) TX3 zone, TX LCR civil work 130 Hours
Continuous		  
02-Nov-26 08:00 13-Nov-26 18:00 EPCOR Outage 72JW19 (EP 805s Jasper - Woodcroft), T1 (Woodcroft), W721 (Woodcroft), W722 (Woodcroft) TX1 zone, LCR cutovers and commissioning 274 Hours
Continuous		  
02-Nov-26 08:00 05-Nov-26 18:00 ALTALINK RB 234L (133L tap - 505L tap), 133L (19s Wabamun - 234L tap), 234L (310p Sundance - 505L tap), 505L (234L tap - 505L tap), 522AL (868s Keephills Make-Up - 522L tap), 522L (133L tap - 522AL tap), 522L (320p Keephills - 133L tap), 522L (866s Sundance Make-Up - 522AL tap) 234L53-55 cross arm change 82 Hours
Daily		  
02-Nov-26 08:00 02-Nov-26 17:00 ATCO TE 739s RTU/SCADA (739s Edith Lake), ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
02-Nov-26 08:00 02-Nov-26 17:00 ATCO TE 731s RTU/SCADA (731s Elmworth), ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
02-Nov-26 08:00 02-Nov-26 17:00 ATCO TE 749s Flyingshot Lake RTU/SCADA, ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
02-Nov-26 08:00 02-Nov-26 16:00 ENMAX Outage 41.1TR (SS-41) secondary cabinet hinge install 8 Hours
Continuous		  
02-Nov-26 09:00 06-Nov-26 17:00 ENMAX Outage 31.3TR (SS-31) installation of new surge arrestors 104 Hours
Continuous		  
02-Nov-26 09:00 06-Nov-26 19:00 ALTALINK RB 472AL (221s Sunken Lake - 472L tap), 472L (213s Hughenden - 472AL tap), 472L (648s Metiskow - 472AL tap) replace arm and insulation on 472L 106 Hours
Daily		  
02-Nov-26 09:00 12-Nov-26 17:00 ALTALINK TE 353s Protection & Control (353s Plamondon) changes to substation network, including changes to IP address changes 248 Hours
Daily		  
02-Nov-26 09:00 03-Nov-26 18:00 ALTALINK TE 233s Protection & Control (233s Beamer) upgrade 33 Hours
Continuous		  
02-Nov-26 09:00 03-Nov-26 18:00 ALTALINK TE 71s Protection & Control (71s Lamoureux) upgrade 33 Hours
Continuous		  
02-Nov-26 09:00 02-Nov-26 18:30 ENMAX, ALTALINK Outage 240kV West Bus (SS-25), 1080L (SS-25 - SS-65), 25B240-D136 (SS-25), 25B240-D133 (SS-25), 25B240-D142 (SS-25), 25B240-D139 (SS-25), 25B240-D138 (SS-25) oil sampling required on cables 9.5 Hours
Daily		  
02-Nov-26 09:00 02-Nov-26 17:00 ENMAX, ALTALINK RB 23.80L (74s Janet - SS-23) fall tree trimming 8 Hours
Continuous		  
02-Nov-26 09:00 02-Nov-26 17:00 ENMAX RB 13.82L (SS-13 - SS-22) fall tree trimming 8 Hours
Continuous		  
02-Nov-26 09:00 06-Nov-26 17:00 CMH Outage MH-20L (MHS-3 Southridge - MHS-6 CMH Riverview), MH-8L (MHS-1 CMH Power Plant - MHS-6 CMH Riverview), MHS-3 MH138-T34 (MHS-3 Southridge), MHS-6 MH138-620 (MHS-6 CMH Riverview), MHS-6 MH138-621 (MHS-6 CMH Riverview), MHS-6 MH69-615 (MHS-6 CMH Riverview), MHS-6 MH69-609 (MHS-6 CMH Riverview), MHS-6 MH69-613 (MHS-6 CMH Riverview), MHS-6 MH69-610 (MHS-6 CMH Riverview), MHS-6 MH69-616 (MHS-6 CMH Riverview), MHS-6 MH69-608 (MHS-6 CMH Riverview), MHS-6 MH69-614 (MHS-6 CMH Riverview), MHS-6 MH69-611 (MHS-6 CMH Riverview), MHS-3 MH138-318 (MHS-3 Southridge), MHS-3 MH138-317 (MHS-3 Southridge) breaker and disconnect switch maintenance, breaker heater wiring 104 Hours
Continuous		  
02-Nov-26 09:00 02-Nov-26 18:30 ENMAX, ALTALINK IO 1080L (SS-25 - SS-65), 240kV West Bus (SS-25) oil sampling required on cables 9.5 Hours
Continuous		  
02-Nov-26 09:00 02-Nov-26 17:00 ENMAX, ALTALINK RB 23.80L (74s Janet - SS-23) fall tree trimming 8 Hours
Continuous		  
02-Nov-26 09:00 20-Nov-26 17:00 ALTALINK TE 163s RTU/SCADA (163s Amoco Empress) SCADA configuration updates 440 Hours
Daily		  
02-Nov-26 09:00 20-Nov-26 17:00 ALTALINK TE 55s RTU/SCADA (55s Olds) 55s P&C major scope 440 Hours
Daily		  
02-Nov-26 09:00 27-Nov-26 17:00 ALTALINK TE 163s Protection & Control (163s Amoco Empress) ACC visibility upgrade 608 Hours
Daily		  
02-Nov-26 09:00 06-Nov-26 17:00 ALTALINK, BCH Outage 1L274 (48s Pocaterra - 978s BCH Britt Creek) tree removal along 1L274 BC maintenance does not affect the Alberta ATC 104 Hours
Daily		 AB-BC
02-Nov-26 09:00 27-Nov-26 17:00 ALTALINK TE 275s Protection & Control (275s Jenner) 1002L protection outages required for ACC visibility upgrades and alarm splitting 608 Hours
Daily		  
02-Nov-26 09:00 27-Nov-26 17:00 ALTALINK TE 562s Protection & Control (562s Cypress) 669L and 1011L protection outages required for ACC visibility upgrades and alarm splitting 608 Hours
Daily		  
02-Nov-26 09:00 27-Nov-26 17:00 ALTALINK TE 163s Protection & Control (163s Amoco Empress) ACC visibility upgrade 608 Hours
Daily		  
02-Nov-26 09:00 27-Nov-26 17:00 ALTALINK TE 394s Protection & Control (394s Empress) 760LN L2 protection outages required for ACC visibility upgrades and alarm splitting at 163s 608 Hours
Daily		  
02-Nov-26 09:00 02-Nov-26 19:00 ALTALINK, BCH Outage 887L (48s Pocaterra - 978s BCH Britt Creek), 48s 887X (48s Pocaterra) tree removal along 1L274 10 Hours
Daily		 AB-BC
02-Nov-26 09:00 02-Nov-26 18:30 ENMAX, ALTALINK IO 1080L (SS-25 - SS-65) oil sampling on cables 9.5 Hours
Continuous		  
02-Nov-26 10:00 02-Nov-26 11:00 ATCO TE ATCO Telecom Equipment, 740s RTU/SCADA (740s H.R.Milner), 2091s RTU/SCADA (2091s Thornton), 810s RTU/SCADA (810s Dome Cutbank) upgrading the debolt 'A' SAR OS to V21, then V22 1 Hour
Continuous		  
02-Nov-26 10:00 03-Nov-26 18:00 ATCO TE ATCO Telecom Equipment WillowLake_S-Telecom- upgrades to SAR A 32 Hours
Continuous		  
02-Nov-26 10:00 06-Nov-26 19:00 ALTALINK Outage 720L (347s AML Fox Creek - 397s Benbow), 347s 720X (347s AML Fox Creek), 397s 720N (397s Benbow) line maintenance
105 Hours
Continuous		  
02-Nov-26 10:00 02-Nov-26 12:00 ATCO TE ATCO Telecom Equipment Nevis_T-Telecom-SAR A OS upgrades 2 Hours
Continuous		  
02-Nov-26 10:00 06-Nov-26 19:00 ATCO TE 2029s Protection & Control (2029s Heathfield) complete the EN100 firmware upgrade on the breaker fail relays
105 Hours
Continuous		  
02-Nov-26 10:00 02-Nov-26 17:00 ATCO TE 2009s RTU/SCADA (2009s Willow Lake) swapping site networking to VPLS 11 7 Hours
Continuous		  
02-Nov-26 10:00 02-Nov-26 18:00 ALTALINK, BCH RB 887L (48s Pocaterra - 978s BCH Britt Creek) tree removal along 1L274 8 Hours
Daily		  
02-Nov-26 11:00 05-Nov-26 17:00 ATCO TE 951s RTU/SCADA (951s Thickwood Hills) relay software patching 78 Hours
Continuous		  
02-Nov-26 11:00 18-Dec-26 19:00 ATCO TE 948s RTU/SCADA (948s Heatburg), 948s Protection & Control (948s Heatburg) automation upgrade/relay firmware to at 948S Heatburg, 1,112 Hours
Continuous		  
02-Nov-26 12:00 04-Nov-26 16:00 ALTALINK Outage 163s T1 (163s Amoco Empress) breaker fail upgrade project: breaker fail trip testing, trip testing, replace T1 tap changer controller, and change CT ratio and protection setting update 52 Hours
Continuous		  
02-Nov-26 12:00 03-Nov-26 18:00 ATCO RB 6L56 (763s Hanna - 802s Michichi Creek) 10 year climbing inspection on 6L56 30 Hours
Continuous		  
02-Nov-26 13:00 05-Nov-26 13:00 ATCO TE 740s Protection & Control (740s H.R.Milner) RTXP replacement and PRC relay testing 72 Hours
Continuous		  
02-Nov-26 13:00 05-Nov-26 13:00 ATCO Outage 740s 702T (740s H.R.Milner), 740s 700 (740s H.R. Milner) PRC-005 - microprocessor relay testing
TCM program		 72 Hours
Continuous		  
02-Nov-26 14:00 06-Nov-26 17:00 Saskpower Outage SaskPower S1H maintenance 99 Hours
Continuous		 AB-SK
03-Nov-26 07:00 03-Nov-26 16:30 ENMAX, ALTALINK Outage 240kV West Bus (SS-25), 1109L (SS-25 - SS-65), 25B240-D133 (SS-25), 25B240-D136 (SS-25), 25B240-D139 (SS-25), 25B240-D141 (SS-25), 25B240-D142 (SS-25), 25MD240-1109 (SS-25) Altalink outage - oil sample, grounding clean up, and transferring Y(B) phase to the spare cable connection and transferring the monitoring to this phase 9.5 Hours
Continuous		  
03-Nov-26 08:00 03-Nov-26 18:00 ALTALINK Outage 510s 2552 (510s Sunnybrook) PRC relay maintenance 10 Hours
Continuous		  
03-Nov-26 08:00 04-Nov-26 19:00 ALTALINK Outage 723L (69s North Barrhead - 724L tap), 69s 723E (69s North Barrhead) replace 723L structure 35 Hours
Continuous		  
03-Nov-26 08:00 03-Nov-26 18:30 ENMAX, ALTALINK IO 1109L (SS-25 - SS-65) oil sample, grounding clean up, and transferring Y(B) phase to the spare cable connection and transferring the monitoring to this phase 10.5 Hours
Daily		  
03-Nov-26 08:00 03-Nov-26 17:00 ATCO TE 741s RTU/SCADA (741s Fox Creek), ATCO Telecom Equipment Fox Creek substation RTU upgrade 9 Hours
Continuous		  
03-Nov-26 08:00 03-Nov-26 17:00 ATCO TE ATCO Telecom Equipment, 815s RTU/SCADA (815s Goodfare) Goodfare substation RTU upgrade 9 Hours
Continuous		  
03-Nov-26 08:00 03-Nov-26 16:00 ENMAX Outage 40.2TR (SS-40) 40.2TR secondary cabinet hinge installation 8 Hours
Continuous		  
03-Nov-26 08:30 03-Nov-26 17:30 ALTALINK IO 256s C1 (256s Harmattan) complete PRC maintenance on C1 protection and 27/BAT 9 Hours
Daily		  
03-Nov-26 09:00 05-Nov-26 17:00 ALTALINK TE 268s Protection & Control (268s Whitecourt) settings change 56 Hours
Daily		  
03-Nov-26 09:00 05-Nov-26 17:00 ALTALINK TE 268s RTU/SCADA (268s Whitecourt) RTU database update 56 Hours
Daily		  
03-Nov-26 09:00 03-Nov-26 17:00 ALTALINK TE 194s Protection & Control (194s South Red Deer) 425L A/B protection outages - test SCADA changes associated with SCADA medium upgrade project 8 Hours
Continuous		  
03-Nov-26 09:00 03-Nov-26 17:00 ALTALINK TE 217s Protection & Control (217s North Red Deer) 425L protection outages for remote end isolation associated with 194s SCADA medium upgrade 8 Hours
Daily		  
03-Nov-26 09:00 03-Nov-26 17:00 ALTALINK TE 39s RTU/SCADA (39s Bickerdike) RTU database update 8 Hours
Daily		  
03-Nov-26 09:00 03-Nov-26 17:00 ENMAX RB 21.61L (SS-21 - SS-34) fall tree trimming 8 Hours
Continuous		  
03-Nov-26 09:00 03-Nov-26 17:00 ENMAX RB 16.60L (SS-16 - SS-34) fall tree trimming 8 Hours
Continuous		  
03-Nov-26 09:00 03-Nov-26 16:00 ALTALINK Outage 1212L (12s Heartland - 89s Ellerslie), 12s 952 (12s Heartland), 12s 852 (12s Heartland), 89s 1952 (89s Ellerslie), 89s 1852 (89s Ellerslie) replace damaged marker cones and inspect remaining cones across highway 7 Hours
Continuous		  
03-Nov-26 09:00 03-Nov-26 16:00 ALTALINK RB 1206L (12s Heartland - 89s Ellerslie) proximity reclose blocks for maintenance on 1212L structure 74 7 Hours
Continuous		  
03-Nov-26 09:00 04-Nov-26 17:00 ALTALINK TE 65s Protection & Control (65s High River) standard relay maintenance 32 Hours
Daily		  
03-Nov-26 09:00 06-Nov-26 17:00 ALTALINK, BCH TE 1201L (520s Bennett - BCH Cranbrook) protection outage and maintenance 80 Hours
Continuous		  
03-Nov-26 10:00 07-Nov-26 18:00 ALTALINK Outage 71s 240kV East Bus (71s Lamoureux), 997L (71s Lamoureux - 430s Ursus), 71s T2 (71s Lamoureux), 71s 1752 (71s Lamoureux), 71s 1452 (71s Lamoureux), 71s 1352 (71s Lamoureux), 71s 32 (71s Lamoureux) multiple switch repair/replacement and maintenance 71s36, 71s37, 71s46, 71s47 104 Hours
Continuous		  
03-Nov-26 10:00 05-Nov-26 18:00 ATCO TE 888s Protection & Control (888s Dover) block 21B/9L74 and perform breaker fail testing of adjacent breakers to 906, 902, 909 and 912 56 Hours
Continuous		  
03-Nov-26 10:00 03-Nov-26 15:00 ATCO Outage 9L08 (849s Joslyn Creek - 888s Dover), 888s 902 (888s Dover) new 21B/9L74 relay has 50BF/906 function internally 5 Hours
Continuous		  
03-Nov-26 10:00 03-Nov-26 18:00 ALTALINK, BCH Outage 887L (48s Pocaterra - 978s BCH Britt Creek), 48s 887X (48s Pocaterra) removing tree off 1L274 8 Hours
Daily		 AB-BC
03-Nov-26 10:00 06-Nov-26 18:00 ALTALINK, BCH RB 1201L (520s Bennett - BCH Cranbrook) need reclosing off on 5L94 for about an hour to complete testing 80 Hours
Continuous		 AB-BC
03-Nov-26 10:30 03-Nov-26 13:30 Lethbridge TE Lethbridge ICCP Outage configuration updates at Primary control centre and Back up control centre 3 Hours
Continuous		  
03-Nov-26 12:00 03-Nov-26 16:00 ATCO TE 888s Protection & Control (888s Dover) tie in BF initiation signal from 94B-3/900BS2 4 Hours
Continuous		  
04-Nov-26 07:30 06-Nov-26 16:00 ATCO Outage 6L56 (763s Hanna - 802s Michichi Creek), 763s 601 (763s Hanna), 802s 606 (802s Michichi Creek), 802s 601B (802s Michichi Creek) structure replacement and deficiency repair 32.5 Hours
Continuous		  
04-Nov-26 08:00 04-Nov-26 18:00 ALTALINK Outage 510s 1952 (510s Sunnybrook) PRC relay mnt 0510DC ACF1 (s1952) 6MD66 CI 10 Hours
Continuous		  
04-Nov-26 08:00 04-Nov-26 19:00 ALTALINK Outage 85L (35s Rundle Plant - 54L tap) 85L is open ended facilitate 118s Canmore to 9035R Rundle outage 11 Hours
Continuous		  
04-Nov-26 08:00 04-Nov-26 17:00 ATCO TE 846s Grand Centre RTU/SCADA, ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
04-Nov-26 08:00 04-Nov-26 17:00 ATCO TE 820s RTU/SCADA (820s Hangingstone), ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
04-Nov-26 08:00 04-Nov-26 17:00 ATCO TE 948s RTU/SCADA (948s Heatburg), ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
04-Nov-26 08:00 04-Dec-26 18:00 EPCOR Outage 72JM18 (EP 805s Jasper - Meadowlark), M721 (Meadowlark), M722 (Meadowlark), EP 805s J722 (EP 805s Jasper), MAB1 (Meadowlark) JM18/meadowlark: meadowlark TX1 Zone, TX delivery and build 730 Hours
Continuous		  
04-Nov-26 08:00 04-Nov-26 16:00 ENMAX Outage 43.1TR (SS-43) 43.1TR secondary cabinet hinge install 8 Hours
Continuous		  
04-Nov-26 08:30 04-Nov-26 18:30 ALTALINK Outage 523s C1 (523s Bullshead) 523s33 SSC controller temp sensor replacement 10 Hours
Continuous		  
04-Nov-26 09:00 04-Nov-26 19:00 Syncrude TE Syncrude ICCP Outage SCADA - server update 10 Hours
Daily		  
04-Nov-26 09:00 17-Nov-26 13:00 BCH Outage 5L98 (BCH Nicola - BCH Vaseux Lake) replacement of equipment BC maintenance does not affect the Alberta ATC 316 Hours
Continuous		 AB-BC
04-Nov-26 09:00 04-Nov-26 17:00 ALTALINK TE 194s Protection & Control (194s South Red Deer) 194s 426L "A/B" prot outages to test SCADA changes associated with SCADA medium upgrade project 8 Hours
Continuous		  
04-Nov-26 09:00 04-Nov-26 17:00 ALTALINK TE 63s Protection & Control (63s Red Deer) 63s 426L "A/B" prot outages to test SCADA changes associated with SCADA medium upgrade project 8 Hours
Continuous		  
04-Nov-26 09:00 05-Nov-26 18:00 ALTALINK TE 38s Protection & Control (38s East Edmonton) upgrade 33 Hours
Continuous		  
04-Nov-26 09:00 05-Nov-26 18:00 ALTALINK TE 71s Protection & Control (71s Lamoureux) upgrade 33 Hours
Continuous		  
04-Nov-26 09:00 04-Nov-26 17:00 ALTALINK TE 74s Protection & Control (74s Janet) PRC maintenance on 691L A&B 8 Hours
Continuous		  
04-Nov-26 09:00 05-Nov-26 17:00 ALTALINK TE 419s Protection & Control (419s Chestermere) PRC maintenance on 691L A&B, 157RAS A&B, 152 and 352 breaker fail protections 32 Hours
Daily		  
04-Nov-26 09:00 04-Nov-26 18:00 ALTALINK TE AltaLink Telecom Equipment provide throughput and hardware upgrade for the MW radio hop between 118s Canmore and 9035R Rundle 9 Hours
Continuous		  
04-Nov-26 09:00 04-Nov-26 17:00 ENMAX RB 21.61L (SS-21 - SS-34) fall tree trimming 8 Hours
Continuous		  
04-Nov-26 09:00 04-Nov-26 17:00 ENMAX RB 16.60L (SS-16 - SS-34) fall tree trimming 8 Hours
Continuous		  
04-Nov-26 09:00 05-Nov-26 17:00 ALTALINK TE AltaLink Telecom Equipment upgrade radio hop software version to latest release 32 Hours
Daily		  
04-Nov-26 09:00 05-Nov-26 17:00 ALTALINK TE 283s Protection & Control (283s Violet Grove) replace failed protection 32 Hours
Continuous		  
04-Nov-26 09:00 05-Nov-26 17:00 ATCO RB 7L42 (716s Lloydminster - 751s Hill) repair leaning poles on 7L42 Structure 54 & 55 32 Hours
Continuous		  
04-Nov-26 09:00 06-Nov-26 17:00 ALTALINK TE 356s RTU/SCADA (356s Milo) RTU outages for testing of new alarms/status 56 Hours
Daily		  
04-Nov-26 09:00 04-Nov-26 17:00 ALTALINK TE 395s RTU/SCADA (395s North Holden), AltaLink Telecom Equipment perform radio maintenance on MDS radio facing 8 Hours
Daily		  
04-Nov-26 10:00 04-Nov-26 16:00 ATCO TE 2015s RTU/SCADA (2015s Yeo), ATCO Telecom Equipment swapping site networking to VPLS 11 6 Hours
Continuous		  
04-Nov-26 10:00 04-Nov-26 15:00 ATCO Outage 888s 909 (888s Dover) protection work 5 Hours
Continuous		  
04-Nov-26 10:00 04-Nov-26 16:00 ALTALINK Trans Test 256s C1 (256s Harmattan) 256sC1 return to service after repair 6 Hours
Daily		  
04-Nov-26 10:00 05-Nov-26 17:00 ATCO TE 832s RTU/SCADA (832s Blumenort), ATCO Telecom Equipment swapping site networking to VPLS 11 31 Hours
Continuous		  
04-Nov-26 10:00 04-Nov-26 18:00 ALTALINK, BCH Outage 887L (48s Pocaterra - 978s BCH Britt Creek), 48s 887X (48s Pocaterra) removing tree off 1L274 8 Hours
Daily		 AB-BC
04-Nov-26 11:00 09-Nov-26 20:00 ATCO Outage 9L20 (755s Cordel - 766s Nevis), 766s 901 (766s Nevis) installing spacer dampers on line 129 Hours
Continuous		  
04-Nov-26 13:15 04-Nov-26 15:30 ALTALINK Outage 163s 1552 (163s Amoco Empress) breaker fail trip testing 3 Hours
Continuous		  
04-Nov-26 15:45 04-Nov-26 18:00 ALTALINK Outage 163s 1352 (163s Amoco Empress) breaker fail trip testing 3.48 Hours
Continuous		  
05-Nov-26 00:00 05-Nov-26 08:00 ALTALINK Outage 62s T1 (62s Brazeau Plant), 62s 1 (62s Brazeau Plant) maintenence 3 Hours
Continuous		  
05-Nov-26 07:30 05-Nov-26 13:30 ALTALINK Outage 163s 1752 (163s Amoco Empress) 11/1552 breaker fail trip testing 6 Hours
Continuous		  
05-Nov-26 08:00 05-Nov-26 18:00 ALTALINK Outage 510s 2052 (510s Sunnybrook) PRC relay mnt 0510DC ACF2 (s2052) 6MD66 CI 10 Hours
Continuous		  
05-Nov-26 08:00 06-Nov-26 17:00 ATCO TE ATCO Telecom Equipment, 2091s RTU/SCADA (2091s Thornton) Thornton_S telecom - bringing new fiber link to 845s Big Mountain on line and site switch updates 8 Hours
Continuous		  
05-Nov-26 08:00 05-Nov-26 19:00 ALTALINK Outage 723L (150s Clyde - 438s Westlock), 150s 723W (150s Clyde) replace arms and insulators on 723L str 47, 115 11 Hours
Continuous		  
05-Nov-26 08:00 05-Nov-26 19:00 ALTALINK Outage 202L (61s Lodgepole - 62s Brazeau Plant), 61s 202X (61s Lodgepole), 62s 202 (62s Brazeau Plant) 202L urgent repair 11 Hours
Continuous		  
05-Nov-26 08:00 05-Nov-26 17:00 ATCO TE 764s RTU/SCADA (764s Heisler), ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
05-Nov-26 08:00 05-Nov-26 17:00 ATCO TE ATCO Telecom Equipment, 786s RTU/SCADA (786s High Level) scheduled upgrade 9 Hours
Continuous		  
05-Nov-26 08:00 05-Nov-26 17:00 ATCO TE ATCO Telecom Equipment, 787s RTU/SCADA (787s High Prairie) scheduled upgrade 9 Hours
Continuous		  
05-Nov-26 08:00 05-Nov-26 16:00 ENMAX Outage 43.2TR (SS-43) 43.2TR secondary cabinet hinge install 8 Hours
Continuous		  
05-Nov-26 08:00 05-Nov-26 18:00 EPCOR TE RTU/SCADA (University of Alberta) U of A: RTU outage 10 Hours
Continuous		  
05-Nov-26 09:00 20-Nov-26 18:00 ATCO IO ATCO EMS/ICCP Outage core switch replacement at primary control center and cisco ios firmware upgrades on cisco switches at the primary control center and secondary control center. there is no planned aeso-impacting outage associated with this activity. potential risk of service interruption. 369 Hours
Continuous		  
05-Nov-26 09:00 05-Nov-26 17:00 ALTALINK, ATCO TE 283s RTU/SCADA (283s Violet Grove), ATCO Telecom Equipment RTU database update 8 Hours
Daily		  
05-Nov-26 09:00 06-Nov-26 17:00 ATCO TE ATCO Telecom Equipment, 804s RTU/SCADA (804s Wintering Hills) SCADA work 32 Hours
Continuous		  
05-Nov-26 09:00 05-Nov-26 17:00 ALTALINK TE 51s RTU/SCADA (51s Wainwright), AltaLink Telecom Equipment perform radio maint on MDS Radio from 9465R Lougheed to 51s Wainwright 8 Hours
Daily		  
05-Nov-26 10:00 05-Nov-26 15:00 ATCO Outage 888s 912 (888s Dover) protection work 5 Hours
Continuous		  
05-Nov-26 10:00 05-Nov-26 18:00 ALTALINK, BCH Outage 887L (48s Pocaterra - 978s BCH Britt Creek), 48s 887X (48s Pocaterra) remove tree off 1L274 8 Hours
Daily		 AB-BC
06-Nov-26 07:00 06-Nov-26 18:30 ENMAX, ALTALINK Outage 240kV West Bus (SS-25), 1109L (SS-25 - SS-65), 25B240-D136 (SS-25), 25B240-D133 (SS-25), 25B240-D141 (SS-25), 25B240-D142 (SS-25), 25B240-D139 (SS-25), 25MD240-1109 (SS-25) connection return to existing cable connection for Y(B) phase 10.5 Hours
Continuous		  
06-Nov-26 07:00 06-Nov-26 17:30 ENMAX, ALTALINK IO 1109L (SS-25 - SS-65), 240kV West Bus (SS-25) Altalink outage 10.5 Hours
Continuous		  
06-Nov-26 08:00 06-Nov-26 19:00 ALTALINK Outage 202L (178s Cynthia - 202AL tap), 178s 202X (178s Cynthia) urgent repair - replace crossarms and insulators structures 11 Hours
Continuous		  
06-Nov-26 08:00 06-Nov-26 18:00 ALTALINK, EPCOR RB 1209L (89s Ellerslie - 330p Genesee) bird nest removal 10 Hours
Continuous		  
06-Nov-26 08:00 06-Nov-26 17:00 ATCO TE 917s RTU/SCADA (917s Horse River), ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
06-Nov-26 08:00 06-Nov-26 17:00 ATCO TE 740s RTU/SCADA (740s H.R.Milner), ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
06-Nov-26 08:00 06-Nov-26 17:00 ATCO TE 706s RTU/SCADA (706s Irish Creek), ATCO Telecom Equipment scheduled upgrade 9 Hours
Continuous		  
06-Nov-26 09:00 06-Nov-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 289s RTU/SCADA (289s Saunders Lake) Telecom equipment maintenance
8 Hours
Daily		  
06-Nov-26 09:00 13-Nov-26 17:00 ENMAX Outage 7.2TR (SS-7) 7 sub Z12 bus diff replacement 176 Hours
Continuous		  

Prepared On:   2026-10-30   17:29:34

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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