Alberta Electric System Operator
System Co-ordination Plan
2026-01-22 to 2026-01-30
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		  
18-Mar-25 14:00 17-Mar-26 17:30 ALTALINK Outage 217s C1 (217s North Red Deer) cap. bank unavailable and cannot be energized due to Koncar CTs being present 364.15 Days
Daily		  
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		  
13-Jun-25 17:00 26-Jan-26 07:00 EPCOR Outage T3 (Rossdale) Rossdale - TX3 LCR 226.63 Days
Continuous		  
21-Jul-25 09:00 23-Jan-26 16:30 ATCO TE 732s RTU/SCADA (732s Mitsue) existing RTU system being replaced with new SMP system 186.35 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 03-Apr-26 16:00 ENMAX Outage 32.1TR (SS-32) slip over CT and new power cables installation and P&C works 221.33 Days
Continuous		  
12-Sep-25 08:00 06-Mar-26 16:00 ENMAX Outage 33.1TR (SS-33) tap changer refurbishments. soak test required 175.38 Days
Continuous		  
01-Nov-25 12:00 01-Feb-26 18:00 ALTALINK Outage AML 511s ACF12 (AML 511s Crossings) forced outage 92.29 Days
Continuous		  
25-Nov-25 17:46 30-Jan-26 18:00 ATCO Outage 876s 901T (876s Brintnell) forced outage oil leaking 66.01 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		  
09-Dec-25 17:00 02-Feb-26 11:00 ALTALINK IO 714L (397s Benbow – 1117s South Kaybob), 397s 714 (397s Benbow) complete work on breaker and energize 397s 714 54.75 Days
Continuous		  
04-Jan-26 08:00 31-Mar-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 86.29 Days
Continuous		  
05-Jan-26 08:00 08-Mar-26 16:00 ENMAX Outage 1.80L (SS-1 - 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) 1 sub transmission line cut over 62.29 Days
Continuous		  
05-Jan-26 08:00 22-Jan-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole and cross arm replacement from T&T 17.33 Days
Continuous		  
08-Jan-26 09:31 25-Jan-26 18:00 ALTALINK Outage 719L (263s Strachan - 719AL tap), 263s 719 (263s Strachan) component replacement/maintenance str 260-287 17.35 Days
Continuous		  
08-Jan-26 15:00 31-Jan-26 17:00 ALTALINK Outage 42s C2 (42s Sarcee) forced outage 23.08 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 03-Apr-26 17:00 EPCOR TE Protection & Control (Rossdale) protection blocking, relay maintenance 81.38 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		  
12-Jan-26 08:00 30-Jan-26 16:00 ENMAX Outage 32.3TR (SS-32) panel cut-over 18.33 Days
Continuous		  
14-Jan-26 07:00 31-Jan-26 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe), 235s 799N (235s Entwistle) 799L rebuild between str 888A-909 (section d) 17.46 Days
Continuous		  
14-Jan-26 11:00 24-Jan-26 17:00 ENMAX Outage 162.2TR (SS-162) forced outage, gas relay tripped 10.25 Days
Continuous		  
17-Jan-26 11:00 23-Jan-26 17:00 BHE Canada Outage 120s C2 (120s Picture Butte) forced outage 6.25 Days
Continuous		  
17-Jan-26 11:00 23-Jan-26 17:00 ATCO, ALTALINK Outage 840s McNeill Station, 830L (562s Cypress - 840s McNeill Station) forced outage 6.25 Days
Continuous		 AB-SK
19-Jan-26 06:00 23-Jan-26 17:00 ATCO IO ATCO RTU/SCADA SOC2 Backup Control centre activation 4.46 Days
Continuous		  
19-Jan-26 07:00 23-Jan-26 17:00 EPCOR Outage 72RV2 (EP 511s Victoria - Rossdale), RV728 (Rossdale) RV728 repair w/Mitsubishi and RDS13 repair 4.42 Days
Continuous		  
19-Jan-26 07:00 24-Jan-26 18:00 ATCO RB 7L16 (766s Nevis - 948s Heatburg) facilitate work adjacent to line for CETO project 5.46 Days
Continuous		  
19-Jan-26 07:00 23-Jan-26 17:00 EPCOR TE 330p RTU/SCADA (330p Genesee) firmware upgrades 4.42 Days
Continuous		  
19-Jan-26 07:00 02-Feb-26 17:00 EPCOR Outage 711L (113s Inland Cement - 747L tap), 113s T1 (113s Inland Cement), 113s T2 (113s Inland Cement), 113s 711N (113s Inland Cement), 113s 1 (113s Inland Cement), 113s 5 (113s Inland Cement) aerial line repairs and apparatus emergency bushing replacement 14.42 Days
Continuous		  
19-Jan-26 08:00 22-Jan-26 16:00 ENMAX Outage 6.82L (SS-6 - SS-41), 33.83L (SS-33 - SS-41), 41.2TR (SS-41), 41.1C (SS-41), 41B138-41BT3 (SS-41), 41B138-6.82 (SS-41), 41B138-33.83 (SS-41), 6B138-6.82 (SS-6), 33B138-33.83 (SS-33), 41MD138-41.2TR (SS-41) HV SW maintenance and reversing switch check - 41.2-TC 3.33 Days
Continuous		  
19-Jan-26 08:00 30-Jan-26 18:00 ENMAX TE Protection & Control (SS-20) autoswitching scheme protection outage for 1.81L cutover protection circuit cutover and commissioning to new 1.81L protection 11.42 Days
Daily		  
19-Jan-26 08:00 30-Jan-26 18:00 ENMAX TE Protection & Control (SS-20) SS-20 BMR-82 protection outage. 1.81L cutover- protection circuit cutover and commissioning to new 1.81L protection 11.42 Days
Daily		  
19-Jan-26 08:00 30-Jan-26 18:00 ENMAX TE Protection & Control (SS-20) 1.81L cutover- protection circuit cutover and commissioning to new 1.81L protection 11.42 Days
Daily		  
19-Jan-26 08:00 30-Jan-26 18:00 ENMAX TE Protection & Control (SS-20) 1.81L cutover- protection circuit cutover and commissioning to new 1.81L protection 11.42 Days
Daily		  
19-Jan-26 08:00 23-Jan-26 17:00 ALTALINK TE 37s RTU/SCADA (37s North Calder) database updates on RTU 4.38 Days
Daily		  
19-Jan-26 10:00 23-Jan-26 17:30 ATCO TE 770s Protection & Control (770s Three Hills) PRC-005 relay testing 4.31 Days
Continuous		  
20-Jan-26 07:00 22-Jan-26 17:30 ALTALINK TE 244s Protection & Control (244s Bowmanton) update remote access setting on C1, C1, C3 protection 2.44 Days
Daily		  
21-Jan-26 08:00 23-Jan-26 16:00 ENMAX Outage 14.3TR (SS-14) relay protection test 2.33 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		  
21-Jan-26 08:00 22-Jan-26 18:00 ENMAX Outage 20.1TR (SS-20), 20BA8-20.1TR (SS-20), 20BB8-20.1TR (SS-20) install dev. 90PT for 20.1TR 1.42 Days
Continuous		  
21-Jan-26 09:00 22-Jan-26 17:00 ATCO TE ATCO Telecom Equipment, 875s RTU/SCADA (875s Algar), 2043s RTU/SCADA (2043s Freer) telecom installation
 1.33 Days
Continuous		  
21-Jan-26 09:00 22-Jan-26 17:00 ATCO TE ATCO Telecom Equipment, 2082s Dog Rib telecom installation
 1.33 Days
Continuous		  
22-Jan-26 07:00 22-Jan-26 17:00 EPCOR Outage EP 511s V729 (EP 511s Victoria) victoria: V729, switching school recertification 10 Hours
Continuous		  
22-Jan-26 07:00 22-Jan-26 18:30 ALTALINK Outage 922L (17s Benalto - 310p Sundance), 310p 1952 (310p Sundance), 310p 2052 (310p Sundance) floating 922L ohsw between strs 922L1 and 922L7, in preparation to raise str 922L4, rb required due to proximity 11.5 Hours
Daily		  
22-Jan-26 07:00 22-Jan-26 18:30 ALTALINK RB 926L (17s Benalto - 310p Sundance) required for sap: 401740 922L goi required due to proximity 11.5 Hours
Daily		  
22-Jan-26 07:15 22-Jan-26 17:45 ALTALINK Outage 202L (61s Lodgepole - 62s Brazeau Plant), 61s 202X (61s Lodgepole), 62s 202 (62s Brazeau Plant) replacing arm and insulators str 85 10.5 Hours
Daily		  
22-Jan-26 07:30 23-Jan-26 17:30 ALTALINK RB 443L (55s Olds - 214s Innisfail) south crew will be doing structure replacements from 443L63 – 443L137 1.42 Days
Daily		  
22-Jan-26 07:30 29-Jan-26 17:30 ALTALINK RB 931L (28s West Brooks - 132s Ware Junction) salvage existing concrete foundations from previously removed structures 931L25 & 1075L25 7.42 Days
Daily		  
22-Jan-26 08:00 22-Jan-26 16:00 ALTALINK, WINDYPWPL TE 112s RTU/SCADA (112s Windy Point) split the existing SCADA VLAN from 1 to 1 and 2, loss of acc visibility for up to 15 minutes while updating scada lan switch settings 8 Hours
Daily		  
22-Jan-26 08:00 23-Jan-26 16:00 BCH Outage 2CB9 (BCH Cranbrook) CBK 2CB9 BFPN 1.33 Days
Continuous		 AB-BC
22-Jan-26 08:00 23-Jan-26 16:00 BCH RB 2L113 (BCH Cranbrook - BCH Natal) cbk 2cb9 bfpn- rb outage 1.33 Days
Continuous		 AB-BC
22-Jan-26 08:00 22-Jan-26 12:00 ENMAX Outage 35B138-81 (SS-35) hv breaker maintenance - 35B138-81, breaker trip coil test 4 Hours
Continuous		  
22-Jan-26 08:00 22-Jan-26 17:00 ALTALINK TE 325s Protection & Control (325s Leduc) setting change on A87/50/51/T1, redundancy. maintenance on 87/25B & 87/25B2. no redundancy. 9 Hours
Daily		  
22-Jan-26 08:00 22-Jan-26 17:00 ALTALINK TE 288s Protection & Control (288s Wolf Creek) standard relay maintenance 9 Hours
Daily		  
22-Jan-26 08:00 22-Jan-26 17:00 ALTALINK TE 5s Protection & Control (5s East Calgary) techs to replace power supplies on redundant protections to fix nuisance power cycle issues when 138kv cap bank is operated, no more than 6hrs 9 Hours
Daily		  
22-Jan-26 09:00 22-Jan-26 11:00 ATCO TE ATCO Telecom Equipment, 846s Grand Centre RTU/SCADA upgrading the 'A' sar at grande centre and bear trap, impact traffic for up to 1 hour at 846s 2 Hours
Continuous		  
22-Jan-26 09:00 22-Jan-26 16:00 ATCO TE 846s Protection & Control (846s Grand Centre) prc-005 relay testing 7 Hours
Continuous		  
22-Jan-26 10:00 22-Jan-26 16:00 ATCO TE 917s Protection & Control (917s Horse River) prc-005 relay testing on 7l121 a and b 6 Hours
Continuous		  
22-Jan-26 10:00 22-Jan-26 15:00 CNRL TE 1034s RTU/SCADA (1034s Margie) replacement of a SCADA Ethernet Switch. 5 Hours
Continuous		  
22-Jan-26 10:00 22-Jan-26 17:00 BCH Outage 2L294 (BCH A. A. Lambert - BCH Cranbrook), T3 (BCH Cranbrook) replace a badly vandalized string of insulators 7 Hours
Continuous		 AB-BC
22-Jan-26 12:01 22-Jan-26 16:00 ENMAX Outage 35B138-80 (SS-35) hv breaker maintenance - 35B138-80 breaker trip coil test - 35B138-80 3.98 Hours
Continuous		  
22-Jan-26 19:00 23-Jan-26 18:30 ALTALINK Outage 926L (17s Benalto - 310p Sundance), 310p 2552 (310p Sundance), 310p 2652 (310p Sundance) floating 926L ohsw between strs 926L1 and 926L7, in preparation to raise str 922/926L4,rb required due to proximity 23.5 Hours
Continuous		  
23-Jan-26 07:00 23-Jan-26 19:00 ALTALINK RB 922L (17s Benalto - 310p Sundance) required due to proximity of 926L GOI 12 Hours
Daily		  
23-Jan-26 08:00 23-Jan-26 16:00 ALTALINK TE 15s RTU/SCADA (15s Fort Macleod), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Daily		  
23-Jan-26 09:00 23-Jan-26 16:00 ATCO TE 846s Protection & Control (846s Grand Centre) relay PRC-005 testing 7 Hours
Continuous		  
23-Jan-26 09:00 23-Jan-26 16:00 ATCO TE 917s Protection & Control (917s Horse River) relay PRC-005 testing on 50BF/703, 50BF/704 7 Hours
Continuous		  
23-Jan-26 09:00 23-Jan-26 17:00 BCH Outage 5L98 (BCH Nicola - BCH Vaseux Lake), 5CB5 (BCH Nicola), 5CB25 (BCH Nicola) NIC 5CB5 POW testing / calibration BC maintenance does not affect the Alberta ATC 8 Hours
Continuous		 AB-BC
24-Jan-26 07:00 01-Feb-26 19:00 ALTALINK RB 922L (17s Benalto - 310p Sundance) raising str 922/926L4, goes with sap: 401748 926L RB required due to proximity 8.5 Days
Daily		  
24-Jan-26 07:00 01-Feb-26 19:00 ALTALINK RB 926L (17s Benalto - 310p Sundance) raising str 922/926L4, goes with sap: 401747 922L RB required due to proximity 8.5 Days
Daily		  
24-Jan-26 07:00 24-Jan-26 18:00 EPCOR TE RTU/SCADA (Woodcroft) Woodcroft: substation firewall replacement 11 Hours
Continuous		  
24-Jan-26 09:00 26-Jan-26 08:59 ATCO Outage 9L57 (939s Livock - 960s Birchwood Creek) line to ground clearance mitigation 2 Days
Continuous		  
25-Jan-26 07:00 31-Jan-26 18:00 ATCO RB 7L16 (766s Nevis - 948s Heatburg) HOP on 7L16 to facilitate work adjacent to line for CETO project, stringing activities over 7L16 6.46 Days
Continuous		  
25-Jan-26 08:00 30-Jan-26 18:00 ENMAX Outage 20.3TR (SS-20) 20 SUB switchgear replacement 5.42 Days
Continuous		  
25-Jan-26 08:00 26-Jan-26 18:00 ATCO RB 9L22 (825s Whitefish Lake - 898s Heart Lake) install marker cones over new pipeline crossing, spans 103 and 104 1.42 Days
Continuous		  
25-Jan-26 08:00 26-Jan-26 18:00 ATCO RB 9L81 (825s Whitefish Lake - 898s Heart Lake) install marker cones over new pipeline crossing, 9L81 span104 1.42 Days
Continuous		  
26-Jan-26 07:00 30-Jan-26 17:00 ALTALINK, EPCOR Outage 920L (37s North Calder - 557s Castle Downs), 557s CD2403 (557s Castle Downs), 557s CD2401 (557s Castle Downs) 920LW/castledowns: relay maintenance and op checks 4.42 Days
Continuous		  
26-Jan-26 07:00 26-Jan-26 09:00 ALTALINK TE 254s Protection & Control (254s Coaldale), 83s Protection & Control (83s Taber) update 172L relay event reporting settings 2 Hours
Daily		  
26-Jan-26 07:00 28-Jan-26 17:00 EPCOR Outage T2 (Namao), N722 (Namao), N723 (Namao), NAB2 (Namao) namao: tx2 zone, wiring changes for mimic panel removal 2.42 Days
Continuous		  
26-Jan-26 07:00 30-Jan-26 16:30 NWE Outage NWMT Highwood-Judith Gap Auto 230kV Line pole replacement project on the 230 kV line between Highwood AND Spion Kop Does not affect the Alberta ATC
4.4 Days
Daily		 AB-MATL
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		  
26-Jan-26 07:15 29-Jan-26 17:45 ALTALINK Outage 314L (207s Pinedale - 228s T.M.P.L. Niton), 207s 314 (207s Pinedale), 228s 314 (228s T.M.P.L. Niton) component replacement str 8–97 3.44 Days
Continuous		  
26-Jan-26 07:30 01-Feb-26 17:30 ALTALINK RB 443L (55s Olds - 214s Innisfail) south crew will be doing structure replacements from 443L63 – 443L137 6.42 Days
Daily		  
26-Jan-26 08:00 31-Jan-26 20:00 SUNCOR TE 29EDD-1 Protection & Control (29EDD-1 Millennium) CIP relay password changes at 29EDD 5.5 Days
Continuous		  
26-Jan-26 08:00 29-Jan-26 16:00 ENMAX, ALTALINK TE 932L (74s Janet - SS-162) firmware upgrade 3.33 Days
Continuous		  
26-Jan-26 08:00 27-Jan-26 17:00 ALTALINK TE 63s Protection & Control (63s Red Deer) firmware update and element testing 1.38 Days
Daily		  
26-Jan-26 08:00 28-Jan-26 16:00 ENMAX Outage 13.82L (SS-13 - SS-22), 22.3TR (SS-22), 22.1TR (SS-22), 13B138-13.82 (SS-13), 22B138-22BT8 (SS-22), 22B138-13.82 (SS-22), 22MD138-22.1TR (SS-22), SW83 (SS-22), 22MD138-22.3TR (SS-22), SW84 (SS-22) hv sw maintenance 22SW81, 22SW82, 22SW83, 22SW84, 22SW89, MD-22.1TR, MD-22.3TR. tap changer reversing switch check - 22.1-X-TC, 22.1-Y-TC, 22.3-TC 2.33 Days
Continuous		  
26-Jan-26 08:00 29-Jan-26 16:00 ENMAX, ALTALINK IO 932L (74s Janet - SS-162) firmware upgrade 3.33 Days
Continuous		  
26-Jan-26 08:00 26-Jan-26 16:00 ATCO RB 7L79 (771s Veteran - 932s Pemukan), 7L79 (771s Veteran - 892s Ribstone Creek) interphase spacer install, live line span 388 8 Hours
Continuous		  
26-Jan-26 08:00 26-Jan-26 16:00 ALTALINK TE 5s RTU/SCADA (5s East Calgary), AltaLink Telecom Equipment split the existing SCADA vlan from 1 to 1 and 2, only ACC will lose some scada metering momentarily 8 Hours
Daily		  
26-Jan-26 08:00 27-Jan-26 16:00 ENMAX Outage 35.1TR (SS-35), 35B138-81 (SS-35), 35B138-82 (SS-35), 35MD138-84 (SS-35), 35MD138-86 (SS-35), 35MD138-35.1TR (SS-35) hv sw maintenance - 35MD138-35.1TR, 35MD138-84, 35MD138-86, SW82. hv breaker maintenance - 35B138-82, breaker trip coil test - 35B138-82 1.33 Days
Continuous		  
26-Jan-26 08:00 26-Jan-26 16:00 ENMAX TE RTU/SCADA (SS-65) sdn upgrade 8 Hours
Continuous		  
26-Jan-26 08:00 30-Jan-26 16:00 ALTALINK TE 397s Protection & Control (397s Benbow) 397s714 addition requiring settings changes and testing on A87/21/67/L2, B87/21/67/L2, A87/B1, A77/1159AIS & B77/1159AIS redundancy and 11(96)/1052 & 11(96/25SC/79)/252 no redundancy 4.33 Days
Daily		  
26-Jan-26 08:00 30-Jan-26 17:00 ALTALINK TE 397s RTU/SCADA (397s Benbow) supervisory outages required for alarm/control updates and testing of 397s714 breaker control. supervisory will be in local control, restoration time 30 mins, RTU restored each day 4.38 Days
Daily		  
26-Jan-26 09:00 04-Feb-26 15:00 ATCO Outage 9L57 (939s Livock - 960s Birchwood Creek) 9L57 Line to Ground Clearance Mitigation 9.25 Days
Continuous		  
26-Jan-26 09:00 26-Jan-26 10:00 ATCO TE ATCO Telecom Equipment BADLANDS A SAR OS UPGRADE
MPACT TO THE FOLLOWING TRAFFIC FO UP TO 1 HOUR:
#202 RAS A&B - BADLANDS / WINTERING HILLS
RUNBACK DTT RAS A&B - BADLANDS / NEVIS
BADLANDS 7L85/7LA85 A&B - BADLANDS / WINTERING HILLS
7L85/7LA85 A&B - BADLANDS / ANDERSON
 60 Mins
Continuous		  
26-Jan-26 09:00 26-Jan-26 16:00 ATCO TE 917s Protection & Control (917s Horse River) prc-005 relay testing on 50BF/705, 50BF/706 7 Hours
Continuous		  
26-Jan-26 09:00 26-Jan-26 18:00 ALTALINK Outage 804L (40s 803L tap - 86s 803L tap), 804L (40s Wetaskiwin - 40s 803L tap), 804L (86s Bigstone - 86s 803L tap), 40s 804W (40s Wetaskiwin), 804L-Pseudo (86s Bigstone), 86s 852 (86s Bigstone) Install grounds at 804L28 for county bridge construction 9 Hours
Daily		  
26-Jan-26 10:00 29-Jan-26 17:00 ALTALINK TE 17s Protection & Control (17s Benalto) upgrade protection relays 3.29 Days
Daily		  
26-Jan-26 10:00 27-Jan-26 17:00 ALTALINK TE 283s Protection & Control (283s Violet Grove) standard relay maintenance 31 Hours
Daily		  
26-Jan-26 10:00 29-Jan-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) relay maintenance on 96/25SC/79/452 & 96/25SC/79/4052 no redundancy, relay maintenance on B87/240BC redundancy. 3.29 Days
Daily		  
26-Jan-26 10:00 26-Jan-26 17:00 ALTALINK TE 247s Protection & Control (247s Piper Creek) firmware update and element testing 7 Hours
Daily		  
26-Jan-26 13:00 30-Jan-26 13:00 ATCO TE 789s Protection & Control (789s Keg River) prc relay testing 7L64, 7L62, 7L59 and 701BF, 702BF, 703BF 4 Days
Continuous		  
26-Jan-26 13:00 29-Jan-26 13:00 ATCO TE 2091s Protection & Control (2091s Thornton) prc relay testing 7L20, 7L228, 87/700BS1, 5L703, 5L720 and 5L775 3 Days
Continuous		  
27-Jan-26 07:00 27-Jan-26 17:00 EPCOR Outage EP 511s V727 (EP 511s Victoria) Victoria: V727, switching school recertification 10 Hours
Continuous		  
27-Jan-26 07:00 27-Jan-26 13:00 ALTALINK Outage 854L (39s Bickerdike - 854AL tap), 39s 152 (39s Bickerdike), 39s 252 (39s Bickerdike), 39s 854N (39s Bickerdike) deficiency work to implement 39s854N MOD status cutovers and testing to AIS1159 protections 6 Hours
Daily		  
27-Jan-26 07:45 27-Jan-26 13:00 ALTALINK Outage 207s T1 (207s Pinedale) replace 207s20 & 207s40 cutouts that have been found cracked and hot 5.25 Hours
Daily		  
27-Jan-26 08:00 27-Jan-26 16:00 ALTALINK TE 266s RTU/SCADA (266s SC1) split the existing SCADA VLAN
 8 Hours
Daily		  
27-Jan-26 08:00 27-Jan-26 17:00 ALTALINK TE AltaLink Telecom Equipment update 9933R MPLS firmware 9 Hours
Daily		  
27-Jan-26 08:00 27-Jan-26 16:00 ALTALINK TE 39s Protection & Control (39s Bickerdike) protection outages 8 Hours
Daily		  
27-Jan-26 09:00 27-Jan-26 11:00 ATCO TE ATCO Telecom Equipment, 755s RTU/SCADA (755s Cordel), 757s RTU/SCADA (757s Battle River), 755s Protection & Control (755s Cordel) Cordel_S-Telecom upgrades 2 Hours
Continuous		  
27-Jan-26 09:00 27-Jan-26 16:00 ATCO TE 917s Protection & Control (917s Horse River) PRC-005 relay testing 7 Hours
Continuous		  
27-Jan-26 09:00 28-Jan-26 17:30 ATCO TE 7LA128 (572s Highland - 7L128 tap) 21B/7LA128 protection settings updating for time sync issues 1.35 Days
Continuous		  
28-Jan-26 06:00 11-Feb-26 18:00 Lethbridge IO Lethbridge PCC activating Backup Control Centre to allow for renovations to the Main Control Centre 14.5 Days
Continuous		  
28-Jan-26 07:00 28-Jan-26 17:00 EPCOR Outage EP 511s V728 (EP 511s Victoria) Victoria: V728, Switching School Recertification 10 Hours
Continuous		  
28-Jan-26 07:00 28-Jan-26 17:00 EPCOR TE 987s RTU/SCADA (987s Clover Bar) Cloverbar: 72kV RTU Comms Outage for panel cutovers. Loss of visibility and control. oSCADA crews will be on site. 10 Hours
Continuous		  
28-Jan-26 07:30 29-Jan-26 16:00 ENMAX Outage B138-85 (SS-1), B138-86 (SS-1) 1 sub Transmission line cut over. 87LA-1.81L AND 87LB-1.81L *END TO ENDS 1.35 Days
Continuous		  
28-Jan-26 07:30 28-Jan-26 20:00 ATCO TE ATCO Telecom Equipment, 825s Whitefish Lake RTU/SCADA CIP patching 12.5 Hours
Continuous		  
28-Jan-26 07:30 28-Jan-26 17:00 ATCO TE 801s RTU/SCADA (801s Anderson), ATCO Telecom Equipment Anderson Substation As part of CIP patching vulnerabilities are identified and then patched. Loss of Visibility for 5-10 min during reboots 9.5 Hours
Continuous		  
28-Jan-26 07:30 28-Jan-26 17:00 ATCO TE 755s RTU/SCADA (755s Cordel), ATCO Telecom Equipment Cordel Substation As part of CIP patching vulnerabilities are identified and then patched. Loss of Visibility for 5-10 min during reboots 9.5 Hours
Continuous		  
28-Jan-26 08:00 28-Jan-26 17:00 ALTALINK TE AltaLink Telecom Equipment 338s Repair radio. Supervisory circuits reroute. All TPR will reroute in less than 50ms, RAS142 and various DIST TPR oos momentarily during reroute. 9 Hours
Daily		  
28-Jan-26 08:00 28-Jan-26 17:00 ALTALINK TE 525s RTU/SCADA (525s Carseland) RTU database update 9 Hours
Daily		  
28-Jan-26 08:00 28-Jan-26 17:00 ALTALINK TE 358s Protection & Control (358s Amoco Brazeau) standard relay maintenance, redundant protections in place at all times 9 Hours
Daily		  
28-Jan-26 08:00 28-Jan-26 12:00 ALTALINK TE 62s Protection & Control (62s Brazeau Plant) standard relay maintenance, redundant protections in place at all times 4 Hours
Daily		  
28-Jan-26 08:00 28-Jan-26 16:00 ALTALINK TE 225s RTU/SCADA (225s Magrath) Split the existing SCADA VLAN from 1 to 1 and 2. Loss of ACC visibility for up to 15 minutes while updating SCADA LAN switch settings. 8 Hours
Daily		  
28-Jan-26 08:00 29-Jan-26 16:00 ENMAX Outage 35.2TR (SS-35), 35B138-80 (SS-35), 35B138-83 (SS-35) HV SW Maintenance - 35MD138-35.2TR, 35MD138-90, 35MD138-92, 35MD138-80, SW84. HV Breaker Maintenance - 35B138-83. Breaker Trip Coil Test - 35B138-83 1.33 Days
Continuous		  
28-Jan-26 09:00 28-Jan-26 11:00 ATCO TE ATCO Telecom Equipment Garden Plain OS upgrades 2 Hours
Continuous		  
28-Jan-26 09:00 28-Jan-26 11:00 ATCO Outage 9L59 (801s Anderson - 9LA59 tap) accommodate outage 1-00508220 2 Hours
Continuous		  
28-Jan-26 09:00 28-Jan-26 10:00 Lethbridge TE 111s RTU/SCADA (111s Coalbanks) Firewall Updates on RX 1524 at 111s 60 Mins
Continuous		  
28-Jan-26 09:30 28-Jan-26 17:30 ATCO TE 769s Protection & Control (769s Stettler) CT wire logic removal 8 Hours
Continuous		  
28-Jan-26 10:00 28-Jan-26 11:00 Lethbridge TE 146s RTU/SCADA (146s Macdonald) Firewall Updates on RX 1524 at 146s 60 Mins
Continuous		  
28-Jan-26 11:00 28-Jan-26 12:00 Lethbridge TE 181s RTU/SCADA (181s Chinook) Firewall Updates on RX 1524 at 181s 60 Mins
Continuous		  
28-Jan-26 12:00 28-Jan-26 13:00 Lethbridge TE 241s RTU/SCADA (241s Uplands) Firewall Updates on RX 1524 at 241s 60 Mins
Continuous		  
28-Jan-26 13:00 28-Jan-26 14:00 Lethbridge TE 593s RTU/SCADA (593s Lakeview) Firewall Updates on RX 1524 at 593s 60 Mins
Continuous		  
28-Jan-26 14:00 28-Jan-26 15:00 Lethbridge TE 674s RTU/SCADA (674s Bowron) Firewall Updates on RX 1524 at 674s 60 Mins
Continuous		  
29-Jan-26 07:00 29-Jan-26 17:00 EPCOR Outage EP 511s V726 (EP 511s Victoria), EP 511s V723 (EP 511s Victoria) switching school recertification 10 Hours
Continuous		  
29-Jan-26 07:30 29-Jan-26 17:00 ATCO TE ATCO Telecom Equipment, 888s RTU/SCADA (888s Dover) CIP vulnerabilities are identified and then patched 9.5 Hours
Continuous		  
29-Jan-26 07:30 29-Jan-26 17:00 ATCO TE ATCO Telecom Equipment, 849s RTU/SCADA (849s Joslyn Creek) CIP vulnerabilities are identified and then patched 9.5 Hours
Continuous		  
29-Jan-26 07:30 29-Jan-26 20:00 ATCO TE ATCO Telecom Equipment, 809s RTU/SCADA (809s Louise Creek) as part of CIP patching vulnerabilities are identified and then patched
 12.5 Hours
Continuous		  
29-Jan-26 07:30 29-Jan-26 20:00 ATCO TE ATCO Telecom Equipment, 825s Whitefish Lake RTU/SCADA CIP patching vulnerabilities are identified and then patched 12.5 Hours
Continuous		  
29-Jan-26 08:00 29-Jan-26 17:00 ALTALINK TE 74s Protection & Control (74s Janet) firmware upgrade on 932L 9 Hours
Daily		  
29-Jan-26 08:00 29-Jan-26 17:00 ALTALINK TE 131s Protection & Control (131s Moon Lake) standard relay maintenance 9 Hours
Daily		  
29-Jan-26 08:00 30-Jan-26 16:00 ENMAX Outage 22.81L (SS-22 - SS-39), 22.2TR (SS-22), 22B138-22BT8 (SS-22), SW85 (SS-22), 22B138-22.81 (SS-22), 22MD138-22.2TR (SS-22), 39B138-22.81 (SS-39) HV SW maintenance, reversing switch check 1.33 Days
Continuous		  
29-Jan-26 08:00 29-Jan-26 17:00 ALTALINK TE 74s RTU/SCADA (74s Janet) techs to resolve pass-through issues involved with RIO D10 9 Hours
Daily		  
29-Jan-26 08:30 29-Jan-26 17:30 ALTALINK TE 89s Protection & Control (89s Ellerslie) DSP card replacements for 1057L 9 Hours
Daily		  
29-Jan-26 09:00 29-Jan-26 11:00 ATCO, CNRL TE ATCO Telecom Equipment, 838s RTU/SCADA (838s Horizon Mining), 838s Protection & Control (838s Horizon Mining), 849s RTU/SCADA (849s Joslyn Creek) CNRL Horizon Expansion_S-Telecom- Horizon sub A SAR and NET 11 SAR os upgrades 2 Hours
Continuous		  
29-Jan-26 09:00 29-Jan-26 16:00 ATCO TE 917s Protection & Control (917s Horse River) PRC-005 relay testing on 51-46/706C, 51-27-59/706C 7 Hours
Continuous		  
29-Jan-26 09:00 30-Jan-26 17:00 ATCO, ALBIAN TE 919s RTU/SCADA (919s Hartley), 920s RTU/SCADA (920s Jackpine) investigate CNRL communication signals, troubleshoot invalid data values, cycle power on 920S and 919S RTU 1.33 Days
Continuous		  
29-Jan-26 09:00 29-Jan-26 16:00 ENMAX Outage 38.1TR (SS-38) training delivery transmission 7 Hours
Continuous		  
29-Jan-26 10:00 30-Jan-26 17:30 ATCO TE 959s Protection & Control (959s Lanfine), 959s RTU/SCADA (959s Lanfine) 87BA-B 700BS2 Siemens 7UT635 31.5 Hours
Continuous		  
30-Jan-26 07:30 30-Jan-26 20:00 ATCO TE 898s Heart Lake RTU/SCADA, ATCO Telecom Equipment Heart Lake_S-Telecom- CIP patching 12.5 Hours
Continuous		  
30-Jan-26 08:00 30-Jan-26 16:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale), AltaLink Telecom Equipment split the existing SCADA VLAN 8 Hours
Daily		  
30-Jan-26 09:00 30-Jan-26 11:00 ATCO TE 861s RTU/SCADA (861s Eureka River), ATCO Telecom Equipment silver valley and clear hills SAR OS upgrades 2 Hours
Continuous		  
30-Jan-26 09:00 30-Jan-26 16:00 ENMAX Outage 38.2TR (SS-38) training delivery transmission 7 Hours
Continuous		  

Prepared On:   2026-01-21   14:51:47

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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