Alberta Electric System Operator
System Co-ordination Plan
2026-02-12 to 2026-02-20
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 735.25 Days
Continuous		  
23-Aug-24 13:45 30-Jun-26 14:29 ALTALINK Outage 157s C1 (157s Lac La Biche) forced outage 676.03 Days
Continuous		  
20-Mar-25 08:00 20-Mar-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 365.38 Days
Continuous		  
31-Mar-25 07:00 27-Feb-26 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 333.46 Days
Continuous		  
14-May-25 08:00 13-Mar-26 16:00 ENMAX TE Protection & Control (SS-32) 32sub 138kV autoswitching protection outage 303.33 Days
Continuous		  
22-Jul-25 08:30 31-Mar-26 16:30 ALTALINK Outage 263s C1 (263s Strachan) forced outage 252.33 Days
Continuous		  
25-Jul-25 17:01 17-Apr-26 17:00 EPCOR Outage T2 (EP Riverview) bushing test failure (found during OE110184) 266 Days
Continuous		  
25-Aug-25 08:00 20-Mar-26 16:00 ENMAX Outage 32.1TR (SS-32) slip over CT and new power cables installation and P&C works 207.33 Days
Continuous		  
12-Sep-25 08:00 19-Jun-26 16:00 ENMAX Outage 33.1TR (SS-33) tap changer refurbishments. soak test required 280.33 Days
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 730.33 Days
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) urgent repairs on 29PT-224 at 29EDD34 on 29PP-45 bus 241.29 Days
Continuous		  
05-Jan-26 08:00 08-Mar-26 16:00 ENMAX Outage 1.80L (SS-1 - SS-28), 28B138-1.80 (SS-28) 1 sub transmission line cut over 62.29 Days
Continuous		  
05-Jan-26 08:00 08-Mar-26 16:00 ENMAX Outage 1.81L (SS-1 - SS-20), 20B138-1.81 (SS-20) 1 sub transmission line cut over 62.29 Days
Continuous		  
08-Jan-26 15:00 28-Feb-26 17:00 ALTALINK Outage 42s C2 (42s Sarcee) forced outage 51.08 Days
Daily		  
12-Jan-26 07:00 03-Apr-26 17:00 EPCOR TE 330p Protection & Control (330p Genesee) protect blocking, annual relay maintenance and password changes 81.38 Days
Continuous		  
12-Jan-26 07:00 01-May-26 17:00 EPCOR TE Protection & Control (Rossdale) protection blocking, relay maintenance 109.38 Days
Continuous		  
12-Jan-26 07:00 03-Apr-26 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking, relay maintenance 81.38 Days
Continuous		  
17-Jan-26 11:00 28-Feb-26 17:00 BHE Canada Outage 120s C2 (120s Picture Butte) forced outage 42.25 Days
Continuous		  
21-Jan-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV switchgear replacement 282.29 Days
Continuous		  
26-Jan-26 07:01 19-Feb-26 17:00 EPCOR Outage T3 (Rossdale), R723 (Rossdale), R724 (Rossdale), RAB3 (Rossdale) Rossdale: TX3 Zone, P&C Commissioning and Initial Energization 24.42 Days
Continuous		  
02-Feb-26 07:00 14-Feb-26 18:00 ALTALINK Outage 719L (719AL tap - 719BL tap) component replacement/maintenance structure 219-258 12.46 Days
Continuous		  
02-Feb-26 16:15 18-Feb-26 10:00 ALTALINK Outage 202L (61s Lodgepole - 202AL tap), 61s 202N (61s Lodgepole) replacing air break 202L335 15.74 Days
Continuous		  
03-Feb-26 07:00 17-Feb-26 14:00 ALTALINK Outage 685L (397s Benbow - 1012s Deer Hill), 397s 685 (397s Benbow), 1012s 685 (1012s Deer Hill), 714L1 (714L tap) 685L conductor and structure maintenance 14.29 Days
Continuous		  
03-Feb-26 09:00 30-Jun-26 17:00 ATCO TE 972s RTU/SCADA (972s Tinchebray) config changes needed throughout the CETO project 147.29 Days
Continuous		  
06-Feb-26 07:00 27-Feb-26 17:30 ALTALINK RB 793L (87s Gaetz - 535s Joffre) crews will be setting structures on 986L/962L STR’s 41-56 & 24-41 and will require a Reclosure Block on
793L		 21.44 Days
Daily		  
08-Feb-26 07:00 06-Apr-26 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe), 235s 799N (235s Entwistle) 799L rebuild between Str 721B-758 (Section B) 57.42 Days
Continuous		  
09-Feb-26 07:00 13-Feb-26 17:00 EPCOR Outage T2 (EP Hardisty), H722 (EP Hardisty), H723 (EP Hardisty), HAB2 (EP Hardisty) TX2 relay maintenance 4.42 Days
Continuous		  
09-Feb-26 07:00 14-Feb-26 17:00 EPCOR Outage T2 (EP Riverview), RW2402 (EP Riverview), RW2403 (EP Riverview) scaffold build for emergency bushing replacement on TX2 5.42 Days
Continuous		  
09-Feb-26 07:30 13-Feb-26 17:30 ALTALINK RB 443L (55s Olds - 214s Innisfail) structure replacements from 443L63 – 443L137 4.42 Days
Daily		  
09-Feb-26 08:00 13-Mar-26 16:00 ENMAX TE Protection & Control (SS-32) 32sub zone 31 and zone 32 bus differential protection outage 32.29 Days
Continuous		  
09-Feb-26 08:00 12-Feb-26 16:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz), AltaLink Telecom Equipment firewall upgrades, MPLS A&B nodes raw circuits and firmware upgrades at 87s 3.33 Days
Daily		  
09-Feb-26 08:00 12-Feb-26 16:00 ENMAX Outage 14.2TR (SS-14) relay protection test - upgrade required 3.33 Days
Continuous		  
09-Feb-26 08:00 19-Feb-26 18:00 ATCO RB 7L81 (791s Rainbow Lake - BCH Harvest Energy FNC Tap) BC Hydro tree trimming 10.42 Days
Continuous		  
09-Feb-26 08:00 17-Feb-26 17:00 ALTALINK TE 397s RTU/SCADA (397s Benbow) configuration updates for new 11(96/25SC/79)/352 8.38 Days
Daily		  
09-Feb-26 08:00 17-Feb-26 17:00 ALTALINK TE 397s Protection & Control (397s Benbow) settings changes & testing for new 11(96/25SC/79)/352 implementation 8.38 Days
Daily		  
09-Feb-26 09:00 26-Jun-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) block all 50BF protection until cutovers and associated commissioning are complete 137.29 Days
Continuous		  
09-Feb-26 09:00 13-Feb-26 17:30 ATCO TE 2075s Protection & Control (2075s Newell) PRC-005 relay testing 4.35 Days
Continuous		  
09-Feb-26 09:00 13-Feb-26 17:30 ATCO TE 2029s Protection & Control (2029s Heathfield) PRC-005 relay testing 4.35 Days
Continuous		  
09-Feb-26 10:00 12-Feb-26 17:00 ALTALINK TE 17s Protection & Control (17s Benalto) removing 190L B21/L1 and 25SR/152, 190L A21/L1 and 25SR/252 for maintenance 3.29 Days
Daily		  
09-Feb-26 10:00 12-Feb-26 15:00 ATCO TE 749s Flyingshot Lake RTU/SCADA RTU updates 3.21 Days
Continuous		  
09-Feb-26 12:00 18-Feb-26 13:00 ATCO Outage 9L57 (939s Livock - 960s Birchwood Creek) 9L57 Line to Ground Clearance Mitigation 9.04 Days
Continuous		  
10-Feb-26 10:00 12-Feb-26 16:00 ATCO TE 706s Protection & Control (706s Irish Creek), 706s RTU/SCADA (706s Irish Creek) relay maintenance 2.25 Days
Continuous		  
11-Feb-26 08:00 12-Feb-26 17:00 ALTALINK TE 102s RTU/SCADA (102s Langdon), AltaLink RTU/SCADA (AltaLink) firewall change and MPLS 4 node firmware 1.38 Days
Daily		  
11-Feb-26 09:00 12-Feb-26 17:00 ATCO TE ATCO Telecom Equipment, 826s RTU/SCADA (826s Marguerite Lake), 721s RTU/SCADA (721s La Corey) Marguerite Lake_S-Telecom- load transfer from Hayley charger to unity rectifier 1.33 Days
Continuous		  
11-Feb-26 09:30 12-Feb-26 17:00 ALTALINK TE 39s Protection & Control (39s Bickerdike) card replacement 31.5 Hours
Daily		  
12-Feb-26 07:00 12-Feb-26 18:00 ALTALINK Outage 700L (422s Westwood - 746L tap), 700L (746s Sherwood Park - 746L tap), 746s 700N (746s Sherwood Park), 422s 700 (422s Westwood) urgent replace failing arm at 746L51 11 Hours
Daily		  
12-Feb-26 07:30 12-Feb-26 12:30 ALTALINK Outage 397s 864W (397s Benbow) implement new 352 (397s685) breaker fail trips to 397s864W 5 Hours
Daily		  
12-Feb-26 07:30 13-Feb-26 17:30 ALTALINK RB 973L (39s Bickerdike - 310p Sundance) NE and SW tower legs need inspection 1.42 Days
Daily		  
12-Feb-26 07:30 13-Feb-26 17:30 ALTALINK RB 974L (39s Bickerdike - 310p Sundance) NE and SW tower legs need inspection 1.42 Days
Daily		  
12-Feb-26 08:00 12-Feb-26 17:00 ALTALINK TE 368s Protection & Control (368s Burdett) PRC relay maintenance 9 Hours
Daily		  
12-Feb-26 08:00 12-Feb-26 16:00 ENMAX IO 2MD138-2.1CAP (SS-2) maintenance on 5S7E 8 Hours
Continuous		  
12-Feb-26 08:00 12-Feb-26 16:00 ENMAX, ALTALINK Outage 5s C3 (5s East Calgary), 5s C4 (5s East Calgary) maintenance 2-5S7E 8 Hours
Daily		  
12-Feb-26 08:00 12-Feb-26 17:00 ALTALINK TE 1012s Protection & Control (1012s Deer Hill) PRC relay maintenance 9 Hours
Daily		  
12-Feb-26 08:00 12-Feb-26 12:00 ENMAX Outage 32.3TR (SS-32) cutover bus diff CT to new Z31/Z32 panel 4 Hours
Continuous		  
12-Feb-26 08:00 12-Feb-26 16:00 ALTALINK TE 263s RTU/SCADA (263s Strachan), AltaLink RTU/SCADA (AltaLink) split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Daily		  
12-Feb-26 08:00 12-Feb-26 16:00 ENMAX Outage 13.2TR (SS-13) 13.2TR oil leaks and 13.2TR gas alarm 8 Hours
Continuous		  
12-Feb-26 08:00 12-Feb-26 12:00 ALTALINK TE AltaLink Telecom Equipment, 191s RTU/SCADA (191s N.W. Cardiff), 352s RTU/SCADA (352s Onoway) 9393R radio maintenance 4 Hours
Daily		  
12-Feb-26 08:30 12-Feb-26 12:00 ALTALINK Outage 368s C2 (368s Burdett), 368s 44 (368s Burdett) PRC relay maintenance 3.5 Hours
Daily		  
12-Feb-26 09:00 12-Feb-26 10:00 ATCO, BSRW TE ATCO Telecom Equipment, 363s RTU/SCADA (363s Sedalia) upgrade Sedalia_S-Telecom A SAR OS 60 Mins
Continuous		  
12-Feb-26 09:00 13-Feb-26 16:00 ATCO TE 2049s Protection & Control (2049s Kettle River) PRC-005 relay testing on 250BF/701, 50BF/702, 21A/7L05, 21B/7L05 31 Hours
Continuous		  
12-Feb-26 10:00 12-Feb-26 12:00 Lethbridge IO Lethbridge PCC updating firmware on the fortigate firewalls 2 Hours
Continuous		  
12-Feb-26 10:00 12-Feb-26 14:00 ALTALINK Outage 250p 2 (250p Bighorn Plant) maintenance 4 Hours
Daily		  
12-Feb-26 12:00 12-Feb-26 16:00 ENMAX Outage 32.83L (SS-32 - SS-40), 32B138-32.83 (SS-32) cutover bus diff CT to new Z31/Z32 panel 4 Hours
Continuous		  
12-Feb-26 12:00 12-Feb-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) RTU outage 5 Hours
Continuous		  
13-Feb-26 07:30 13-Feb-26 17:30 ALTALINK RB 974L (39s Bickerdike - 310p Sundance) completing Geotech investigation at str 165 10 Hours
Daily		  
13-Feb-26 07:30 13-Feb-26 17:30 ALTALINK RB 973L (39s Bickerdike - 310p Sundance) completing Geotech investigation at str 165 10 Hours
Daily		  
13-Feb-26 08:00 13-Feb-26 12:00 ENMAX Outage 40.1TR (SS-40) replace piping 4 Hours
Continuous		  
13-Feb-26 12:01 13-Feb-26 16:00 ENMAX Outage 31.84L (SS-31 - SS-32), 32B138-31.84 (SS-32), 31B138-31.84 (SS-31) cutover bus diff ct to new z31/z32 panel 3.98 Hours
Continuous		  
14-Feb-26 08:00 26-Feb-26 16:00 Syncrude Outage 18215 (Syncrude Mildred Lake), 1834 (Syncrude Mildred Lake), 1835 (Syncrude Mildred Lake) perform 6-Year PM on bus 18 in Plant 31 at Mildred Lake 12.33 Days
Continuous		  
15-Feb-26 07:00 25-Feb-26 17:30 ALTALINK RB 759L (87s Gaetz - 276s Prentiss) stringing new lines under construction 10.44 Days
Continuous		  
16-Feb-26 07:00 19-Feb-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) SCADA change for CETO: adding new status, alarms, controls for new breaker 1352 & 1752 3.42 Days
Daily		  
16-Feb-26 07:00 21-Feb-26 19:00 ATCO RB 9L16 (755s Cordel - 972s Tinchebray) a hold-off is required to facilitate the erection of 3 new towers and stringing for the CETO project near Tynchebray Sub 5.5 Days
Daily		  
16-Feb-26 08:00 18-Feb-26 20:00 SUNCOR TE 29EDD-94 Protection & Control (29EDD-94 Voyageur) updates 2.5 Days
Continuous		  
16-Feb-26 08:00 16-Feb-26 16:00 ALTALINK TE 272s RTU/SCADA (272s Springbank), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Daily		  
16-Feb-26 08:00 17-Feb-26 20:00 SUNCOR TE 29PL9-17 (29EDD-1 Millennium - 29EDD-94 Voyageur), 29EDD-1 Protection & Control (29EDD-1 Millennium), 29EDD-94 Protection & Control (29EDD-94 Voyageur) configuration changes (ABB), DFR updates
 1.5 Days
Continuous		  
16-Feb-26 08:00 28-Feb-26 16:00 ENMAX TE Protection & Control (SS-28) transmission line cut over, 1.80L reconfiguration to new 1 sub- settings changes for new protection 12.33 Days
Daily		  
16-Feb-26 08:00 28-Feb-26 16:00 ENMAX TE Protection & Control (SS-28) transmission line cut over, 1.80L reconfiguration to new 1 sub- settings changes for new protection 12.33 Days
Daily		  
16-Feb-26 08:00 28-Feb-26 16:00 ENMAX TE Protection & Control (SS-28) bus differential protection outage, transmission line cut over for 1.80L reconfiguration to new 1 sub- settings changes for new protection 12.33 Days
Daily		  
17-Feb-26 06:30 19-Feb-26 17:30 ALTALINK RB 944L (132s Ware Junction - 275s Jenner) dress and install the 944AL1 structure within 15m of 944L 2.46 Days
Daily		  
17-Feb-26 06:30 19-Feb-26 17:30 ALTALINK RB 951L (132s Ware Junction - 275s Jenner) required due to proximity 2.46 Days
Daily		  
17-Feb-26 07:00 20-Feb-26 17:00 EPCOR Outage 72CH9 (987s Clover Bar - EP Hardisty), T3 (EP Hardisty), H723 (EP Hardisty), H724 (EP Hardisty), HAB3 (EP Hardisty) relay maintenance on TX3 3.42 Days
Continuous		  
17-Feb-26 07:00 18-Feb-26 17:00 EPCOR Outage EP 511s Victoria T2 (EP 511s Victoria), EP 511s V722 (EP 511s Victoria), EP 511s V723 (EP 511s Victoria) relay maintenance and SCADA RTU upgrade on Victoria TX2 zone 1.42 Days
Continuous		  
17-Feb-26 07:00 06-Mar-26 17:00 EPCOR Outage T1 (Woodcroft), W721 (Woodcroft), W722 (Woodcroft) Woodcroft TX1 LCR demo 17.42 Days
Continuous		  
17-Feb-26 07:00 03-Mar-26 17:00 EPCOR TE EP 511s RTU/SCADA (EP 511s Victoria) upgrade RTU 14.42 Days
Continuous		  
17-Feb-26 07:30 21-Feb-26 17:30 ALTALINK RB 443L (55s Olds - 214s Innisfail) structure replacements from 443L63 – 443L137 4.42 Days
Daily		  
17-Feb-26 07:30 27-Feb-26 17:30 ALTALINK RB 974L (39s Bickerdike - 310p Sundance) fixing piles str 165 10.42 Days
Daily		  
17-Feb-26 07:30 27-Feb-26 17:30 ALTALINK RB 973L (39s Bickerdike - 310p Sundance) fixing piles str 165 10.42 Days
Daily		  
17-Feb-26 08:00 26-Feb-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap) pole and cross arm replacement 9.33 Days
Continuous		  
17-Feb-26 08:00 17-Feb-26 10:00 ENMAX TE Protection & Control (SS-28) 28PT138-Z31 -X core sec. voltage. 1 sub transmission line cut over, relocate and reconnect 2 Hours
Continuous		  
17-Feb-26 08:00 19-Feb-26 17:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale) add T2 tap position sensor and tap position visibility 2.38 Days
Daily		  
17-Feb-26 08:00 24-Feb-26 16:00 BCH Outage T3 (BCH Natal) install ETM BC Hydro maintenance does not affect Alberta ATC 7.33 Days
Continuous		 AB-BC
17-Feb-26 08:00 19-Feb-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 108s RTU/SCADA (108s Amelia) firewall upgrade and LAN switch upgrade 2.38 Days
Daily		  
17-Feb-26 08:00 19-Feb-26 17:00 ALTALINK TE 132s RTU/SCADA (132s Ware Junction), AltaLink Telecom Equipment firewall upgrades 2.38 Days
Daily		  
17-Feb-26 08:00 18-Feb-26 16:00 ENMAX, ALTALINK Outage 832L (SS-10 - SS-12), 12.1TR (SS-12) HV SW Maintenance SW84, SW85, SW86, MD-12.1TR. Reversing Switch Check - 12.1-TC 1.33 Days
Continuous		  
17-Feb-26 08:00 18-Feb-26 16:00 ENMAX TE Protection & Control (SS-37) 37sub BMR 82 protection outage - relay protection test - 37RLY138-37.BMR82 1.33 Days
Continuous		  
17-Feb-26 08:00 17-Feb-26 16:00 ALTALINK TE 237s RTU/SCADA (237s Foothills), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Daily		  
17-Feb-26 08:00 18-Feb-26 16:00 ENMAX, ALTALINK IO 832L (SS-10 - SS-12) maintenance on SW84, SW85, SW86, MD-12.1TR and reversing switch check 12.1-TC. 1.33 Days
Continuous		  
17-Feb-26 08:00 19-Feb-26 17:00 ALTALINK TE 38s Protection & Control (38s East Edmonton) standard relay maintenance 2.38 Days
Daily		  
17-Feb-26 08:00 17-Feb-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 454s RTU/SCADA (454s Buck Lake) routine radio maintenance 9 Hours
Daily		  
17-Feb-26 08:00 17-Feb-26 11:00 ENMAX Outage 31.1TR (SS-31) measurements required surge arrestor addition. 3 Hours
Continuous		  
17-Feb-26 09:00 03-Mar-26 17:00 ATCO Outage 972s 240kV Bus 900BS1 (972s Tinchebray) install breaker 904 and 904CT 14.33 Days
Continuous		  
17-Feb-26 09:00 18-Feb-26 16:00 ATCO TE 2009s Protection & Control (2009s Willow Lake) PRC-005 relay testing on 50BF/703, 50BF/704, 50BF/707 31 Hours
Continuous		  
17-Feb-26 09:00 17-Feb-26 16:00 ATCO TE 715s Protection & Control (715s Leming Lake) PRC-005 relay testing on 700S 701T 7 Hours
Continuous		  
17-Feb-26 09:00 20-Feb-26 17:30 ATCO TE 2075s Protection & Control (2075s Newell) PRC-005 relay testing 3.35 Days
Continuous		  
17-Feb-26 09:00 20-Feb-26 17:30 ATCO TE 2029s Protection & Control (2029s Heathfield) PRC-005 relay testing 3.35 Days
Continuous		  
17-Feb-26 10:00 25-Feb-26 18:00 ATCO RB 7L08 (830s Carmon - 834s Wesley Creek) maintenance program for 32 pole changes, 21 crossarm changes and other structure deficiencies 8.33 Days
Continuous		  
17-Feb-26 10:00 20-Feb-26 15:00 ATCO TE 749s Flyingshot Lake RTU/SCADA RTU updates 3.21 Days
Continuous		  
17-Feb-26 10:00 03-Mar-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) 9L59 and 9L16 protections need to have 901 breaker status simulated “open” over the course of 1-00484273 14.29 Days
Continuous		  
17-Feb-26 10:00 18-Feb-26 16:00 BCH RB 5L96 (BCH Selkirk - BCH Vaseux Lake) tree removal 30 Hours
Continuous		  
17-Feb-26 11:00 19-Feb-26 17:00 ALTALINK TE 428s Protection & Control (428s Namaka) PRC maintenance 2.25 Days
Daily		  
17-Feb-26 11:00 17-Feb-26 11:30 CENOVUS, ATCO TE 1200s RTU/SCADA (1200s Foster Creek Station), 791s RTU/SCADA (791s Rainbow Lake) move power feed for router that carries this traffic onto an ATS 30 Mins
Continuous		  
17-Feb-26 11:01 17-Feb-26 14:00 ENMAX Outage 31.2TR (SS-31) measurements required surge arrestor addition. 2.98 Hours
Continuous		  
17-Feb-26 11:30 19-Feb-26 17:00 ALTALINK TE 681s Protection & Control (681s Bannerman) card replacement 2.23 Days
Daily		  
17-Feb-26 12:00 09-Apr-26 13:31 ATCO TE 882s RTU/SCADA (882s Triangle) updating RTU/station controller configuration during SCADA upgrade project 51.02 Days
Continuous		  
17-Feb-26 13:00 17-Feb-26 15:00 ENMAX TE Protection & Control (SS-28) 28PT138-Z31 -Y core sec. voltage. 1 sub transmission line cut over, relocate and reconnect 2 Hours
Continuous		  
17-Feb-26 13:00 17-Feb-26 17:00 ALTALINK Outage 202L (61s Lodgepole - 202AL tap) close 202L open point 'A' - live line work 4 Hours
Daily		  
17-Feb-26 13:00 12-Mar-26 13:00 ATCO TE 733s Protection & Control (733s Simonette), 733s RTU/SCADA (733s Simonette) tying in RAS circuits to relays, updating RTU 22.96 Days
Continuous		  
17-Feb-26 14:00 17-Feb-26 17:30 ALTALINK Outage 720L (347s AML Fox Creek - 397s Benbow), 397s 720N (397s Benbow), 347s 720X (347s AML Fox Creek) implement new 352 (397s685) breaker fail trips to 397s720N 3.5 Hours
Daily		  
17-Feb-26 14:00 17-Feb-26 17:30 ALTALINK TE 397s Protection & Control (397s Benbow) implement new 352 (397s685) breaker fail trips to 397s720N 3.5 Hours
Daily		  
17-Feb-26 14:00 17-Feb-26 16:00 ENMAX Outage 31.1C (SS-31) measurements required surge arrestor addition. 2 Hours
Continuous		  
17-Feb-26 14:00 17-Feb-26 17:00 ALTALINK TE 397s Protection & Control (397s Benbow) protection outage on new 11(96/25SC/79)/352 protection for BF trip testing of 397s720N breaker 3 Hours
Daily		  
17-Feb-26 17:30 05-Mar-26 17:30 ALTALINK RB 202L (178s Cynthia - 202AL tap), 202L (61s Lodgepole - 202AL tap) safety requirement; create/close 202L open point 'B' 16 Days
Continuous		  
18-Feb-26 07:00 18-Feb-26 18:00 ALTALINK Outage 254s T2 (254s Coaldale), 254s 35 (254s Coaldale) add T2 tap position sensor and tap position visibility 11 Hours
Daily		  
18-Feb-26 07:30 18-Feb-26 16:00 ALTALINK IO AltaLink EMS/ICCP Outage transition of ACC to AECC and back 8.5 Hours
Daily		  
18-Feb-26 08:00 18-Feb-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 445s RTU/SCADA (445s Elk River) 445s - 358s radio repairs. loss of visibility of 445s 9 Hours
Daily		  
18-Feb-26 08:00 19-Feb-26 17:00 ALTALINK Outage 202L (178s Cynthia - 202AL tap), 178s 202X (178s Cynthia) create 202L open point 'B' 1.38 Days
Continuous		  
18-Feb-26 08:00 18-Feb-26 16:00 ALTALINK TE 35s RTU/SCADA (35s Rundle Plant), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Daily		  
18-Feb-26 08:00 19-Feb-26 17:00 ALTALINK TE 28s Protection & Control (28s West Brooks) PRC maint on the following redundant line protections:853L A21/L6, 853L B21/79/L6 one at a time.Also be performing meter reseals on: 28S 2057L, 28S 2056L, 28S 2255L 1.38 Days
Daily		  
18-Feb-26 09:00 18-Feb-26 17:00 ALTALINK, TRANSALTA Outage 32s 22 (32s Barrier), 32s T1 (32s Barrier) 32s22 First Trip/ Minor Maintenance 8 Hours
Daily		  
18-Feb-26 09:00 18-Feb-26 16:00 ATCO TE 715s Protection & Control (715s Leming Lake) PRC-005 relay testing on 87TA/ 701T 7 Hours
Continuous		  
18-Feb-26 09:00 20-Feb-26 16:00 ATCO TE 784s Protection & Control (784s Donnelly), 784s RTU/SCADA (784s Donnelly) 25 kV feeder relay and station controller update to repair broken enable/disable reclosing 2.29 Days
Continuous		  
19-Feb-26 07:30 20-Feb-26 17:30 ALTALINK RB 199L (268s Whitecourt - 199AL tap), 199L (347s AML Fox Creek - 199AL tap) anchor installation near 199L structure 175 1.42 Days
Daily		  
19-Feb-26 08:00 22-Feb-26 16:00 ATCO Outage 9L40 (732s Mitsue - 809s Louise Creek) changing rotten poles from our inspection 3.33 Days
Continuous		  
19-Feb-26 08:00 20-Feb-26 16:00 ENMAX, ALTALINK Outage 833L (SS-2 - SS-12), 12.2TR (SS-12), 12B138-833L (SS-12), SW83 (SS-12), 12MD138-12.2TR (SS-12) hw sw maintenance SW81, SW82, SW83, MD-12.2TR, reversing switch check - 12.2-TC 1.33 Days
Continuous		  
19-Feb-26 08:00 19-Feb-26 16:00 ALTALINK TE AML 793s RTU/SCADA (AML 793s Horse Creek), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Daily		  
19-Feb-26 08:00 20-Feb-26 16:00 ENMAX, ALTALINK IO 833L (SS-2 - SS-12) hw sw maintenance SW81, SW82, SW83, MD-12.2TR, reversing Switch Check - 12.2-TC 1.33 Days
Continuous		  
19-Feb-26 08:00 19-Feb-26 16:00 ENMAX TE Protection & Control (SS-37) 37 sub 138kV Z31 87 (bus differential) and 86 (lockout relay) protection scheme outage, relay protection test - 37RLY138 - 86 lockouts 37RLY138-37.Z31 8 Hours
Continuous		  
19-Feb-26 08:00 19-Feb-26 16:00 ENMAX, ALTALINK TE 771L (SS-47 - SS-162) 47sub 771L A protection outage, troubleshoot channel asymmetry alarm 8 Hours
Continuous		  
19-Feb-26 09:00 19-Feb-26 18:00 ALTALINK Outage 706L (54s Fort Saskatchewan - 706AL tap), 54s 706N (54s Fort Saskatchewan) arctic arrow requires a GOI on 706L for a planned high load move between structures 34-35, see also 862L 9 Hours
Daily		  
19-Feb-26 09:00 19-Feb-26 18:00 ALTALINK, DOW Outage 862L (166s Dow Chemical Fort Saskatchewan - 258s Dow Hydrocarbons), 166s 862N (166s Dow Chemical Fort Saskatchewan) arctic arrow requires a GOI on 862L for a planned high load move between structures 26-27, see also 706L 9 Hours
Daily		  
19-Feb-26 09:00 19-Feb-26 16:00 ATCO TE 2009s Protection & Control (2009s Willow Lake) PRC-005 relay testing on 50BF/706, 50BF/708 7 Hours
Continuous		  
19-Feb-26 09:00 19-Feb-26 16:00 ATCO TE 715s Protection & Control (715s Leming Lake) PRC-005 relay testing on 87TA/702T. 7 Hours
Continuous		  
19-Feb-26 09:00 19-Feb-26 16:00 ATCO TE 751s RTU/SCADA (751s Hill) smp config update
 7 Hours
Continuous		  
19-Feb-26 12:00 19-Feb-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) rtu outage 5 Hours
Continuous		  
19-Feb-26 17:01 05-Mar-26 14:00 ALTALINK Outage 202L (178s Cynthia - 202AL tap) installing a new deadend and air break (202L336B) 13.87 Days
Continuous		  
20-Feb-26 08:00 20-Feb-26 16:00 ENMAX TE Protection & Control (SS-7) relay protection test 8 Hours
Continuous		  
20-Feb-26 08:00 20-Feb-26 16:00 ALTALINK TE 370s RTU/SCADA (370s North Lethbridge) Split the existing SCADA VLAN 8 Hours
Daily		  
20-Feb-26 08:00 20-Feb-26 16:00 ENMAX Outage 39.2TR (SS-39) tag 39.2TR secondary cables 8 Hours
Continuous		  
20-Feb-26 09:00 20-Feb-26 16:00 ATCO TE 2009s Protection & Control (2009s Willow Lake) PRC-005 RELAY TESTING on 21A/7L36, 21B/7L36. 7 Hours
Continuous		  
20-Feb-26 09:00 20-Feb-26 16:00 ATCO TE 715s Protection & Control (715s Leming Lake) PRC-005 relay testing 7 Hours
Continuous		  

Prepared On:   2026-02-11   15:21:59

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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