Alberta Electric System Operator
System Co-ordination Plan
2026-02-05 to 2026-02-13
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		  
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		  
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 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		  
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		  
21-Jan-26 15:53 06-Feb-26 15:53 CMH TE MHS-3 Protection & Control (MHS-3 South Ridge) urgent replace failed protection relay 16 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		  
27-Jan-26 14:00 05-Feb-26 14:00 ATCO Outage 740s 703T (740s H.R.Milner), 740s 507C (740s H.R.Milner), 740s 703 (740s H.R. Milner), 740s 503 (740s H.R. Milner) isolate to investigate fault on underground cables or metering tank on T1 feeder at 740S HR Milner 9 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		  
31-Jan-26 07:00 07-Feb-26 17:30 ALTALINK RB 784L (535s Joffre - 784AL tap), 784L (332s Ellis - 784AL tap), 784AL (482s Haynes - 784L tap) stringing (CETO) 962L/986L 7.44 Days
Daily		  
01-Feb-26 07:00 09-Feb-26 18:00 ATCO RB 7L16 (766s Nevis - 948s Heatburg) to facilitate work adjacent to line for CETO project 8.46 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 07:00 06-Feb-26 17:00 ALTALINK, EPCOR Outage 920L (71s Lamoureux - 557s Castle Downs), 557s CD2405 (557s Castle Downs), 557s CD2404 (557s Castle Downs) relay maintenance and op checks on 920LE/Castledowns 4.42 Days
Continuous		  
02-Feb-26 07:00 06-Feb-26 17:00 EPCOR Outage 72CH11 (987s Clover Bar - EP Hardisty), T1 (EP Hardisty), H725 (EP Hardisty), H722 (EP Hardisty), HAB1 (EP Hardisty) relay maintenance on Hardisty TX1 4.42 Days
Continuous		  
02-Feb-26 07:30 06-Feb-26 17:30 ALTALINK RB 443L (55s Olds - 214s Innisfail) structure replacements from 443L63 – 443L137 4.42 Days
Daily		  
02-Feb-26 08:00 07-Feb-26 20:00 SUNCOR TE 29EDD-34 Protection & Control (29EDD-34) CIP relay password change 5.5 Days
Continuous		  
02-Feb-26 08:00 05-Feb-26 17:00 ALTALINK TE 17s RTU/SCADA (17s Benalto) firewall upgrade 3.38 Days
Daily		  
02-Feb-26 10:00 11-Feb-26 18:00 ATCO RB 7L08 (830s Carmon - 834s Wesley Creek) 32 pole changes, 21 crossarm changes, other structure deficiencies 9.33 Days
Continuous		  
02-Feb-26 10:00 05-Feb-26 17:00 ALTALINK TE 320p Protection & Control (320P Keephills) relay maintenance 3.29 Days
Daily		  
02-Feb-26 10:00 06-Feb-26 17:30 ATCO Outage 770s 705C (770s Three Hills) trip coil testing PRC-005 4.31 Days
Continuous		  
02-Feb-26 11:00 05-Feb-26 17:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) RTU "A" reboot 3.25 Days
Daily		  
02-Feb-26 11:00 05-Feb-26 17:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) investigate IED trouble alarm 3.25 Days
Daily		  
02-Feb-26 11:30 06-Feb-26 16:30 ALTALINK Outage 217s C1 (217s North Red Deer) replacement of CT#5’s with RHM dry type, CTs are located between 217s652 and C1 4.21 Days
Continuous		  
02-Feb-26 13:00 06-Feb-26 13:00 ATCO TE 739s Protection & Control (739s Edith Lake) PRC relay testing 7L172, 7L43, 702BF, and 700BS1, including AUX tripping relays 4 Days
Continuous		  
02-Feb-26 13:00 06-Feb-26 13:00 ATCO TE 789s Protection & Control (789s Keg River) PRC relay testing 4 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		  
03-Feb-26 09:00 05-Feb-26 16:00 ALTALINK TE 397s Protection & Control (397s Benbow) urgent protection outage on A87/21/MET/L1 & B87/21/MET/L1 for re-testing associated with the failed customer equipment 2.29 Days
Daily		  
04-Feb-26 08:00 05-Feb-26 17:00 ALTALINK TE 127s RTU/SCADA (127s Bruderheim), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2. loss of visibility of 127s for 15 minutes in the timeframe indicated. 1.38 Days
Daily		  
04-Feb-26 08:00 05-Feb-26 16:00 ENMAX Outage 47B138-771/1 (SS-47) investigate the leak and possible repair 1.33 Days
Continuous		  
04-Feb-26 08:00 06-Feb-26 16:00 ENMAX Outage 14.1TR (SS-14) relay protection test 2.33 Days
Continuous		  
04-Feb-26 08:00 05-Feb-26 17:00 SUNCOR TE 635EDD-1000 RTU/SCADA (635EDD-1000), 635EDD-1001 RTU/SCADA (635EDD-1001) update the SCADA configurations at 635EDD-1000 and 635EDD-1001 to add in building temp and battery voltage metering points 1.38 Days
Daily		  
05-Feb-26 07:00 05-Feb-26 17:00 EPCOR Outage EP 511s V723 (EP 511s Victoria) switching school recertification 10 Hours
Continuous		  
05-Feb-26 07:00 05-Feb-26 18:30 ALTALINK Outage 922L (17s Benalto - 310p Sundance), 310p 1952 (310p Sundance), 310p 2052 (310p Sundance) clipping in 922L OHSW between strs 922L1 and 922L7, after raising 922/926L4. see also SAP: 401749 926L RB required due to proximity 11.5 Hours
Daily		  
05-Feb-26 07:00 05-Feb-26 18:30 ALTALINK RB 926L (17s Benalto - 310p Sundance) required for SAP: 401742 922L GOI required due to proximity 11.5 Hours
Daily		  
05-Feb-26 07:00 08-Feb-26 16:30 ATCO, ALTALINK Outage 9L913 (69s North Barrhead - 732s Mitsue), 69s 913N (69s North Barrhead) changing white tag poles from test & treat 3.4 Days
Continuous		  
05-Feb-26 07:00 08-Feb-26 16:30 ALTALINK IO 913L (69s North Barrhead - 732s Mitsue) changing white tag poles from test & treat 3.4 Days
Continuous		  
05-Feb-26 08:00 05-Feb-26 17:00 ALTALINK TE 650s Protection & Control (650s Hansman Lake) protection outages on the following to troubleshoot protection alarm cycling issues: 7L224, A21/L12, B21/79/L12 9 Hours
Daily		  
05-Feb-26 08:00 05-Feb-26 16:00 ENMAX Outage 24.82L (SS-24 - SS-65), 65B138-D81 (SS-65), 65B138-D82 (SS-65) I&R red light very dim 8 Hours
Continuous		  
05-Feb-26 08:00 06-Feb-26 16:00 ALTALINK TE 140s RTU/SCADA (140s Thompson) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
05-Feb-26 09:00 05-Feb-26 12:00 ATCO TE ATCO Telecom Equipment upgrading the A SAR and NET 11 SAR to v21 then v22 3 Hours
Continuous		  
05-Feb-26 09:00 05-Feb-26 11:00 ATCO, IMPERIALOIL TE ATCO Telecom Equipment, 837s Mahihkan RTU/SCADA, 909s RTU/SCADA (909s Mahno) upgrading the A SAR to v21 then v22 2 Hours
Continuous		  
05-Feb-26 09:00 05-Feb-26 16:00 ATCO TE 849s Protection & Control (849s Joslyn Creek) PRC-005 relay testing on 21A/9L08, 21B/9L08. 7 Hours
Continuous		  
05-Feb-26 09:00 05-Feb-26 17:00 ALTALINK TE 454s Protection & Control (454s Buck Lake) card replacement 8 Hours
Daily		  
05-Feb-26 12:00 05-Feb-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) RTU outage 5 Hours
Continuous		  
05-Feb-26 19:00 06-Feb-26 18:30 ALTALINK Outage 926L (17s Benalto - 310p Sundance), 310p 2552 (310p Sundance), 310p 2652 (310p Sundance) clipping in 926L OHSW between strs 926L1 and 926L7, after raising str 922/926L4 see also SAP: 401745 922L RB required due to proximity 23.5 Hours
Continuous		  
06-Feb-26 07:00 06-Feb-26 19:00 ALTALINK RB 922L (17s Benalto - 310p Sundance) required due to proximity of 926L GOI 12 Hours
Daily		  
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		  
06-Feb-26 09:00 06-Feb-26 16:00 ATCO TE 849s Protection & Control (849s Joslyn Creek) PRC-005 relay testing 7 Hours
Continuous		  
07-Feb-26 07:00 10-Feb-26 18:30 ALTALINK RB 922L (17s Benalto - 310p Sundance) removing tooling after raising str 922L4 Goes with SAP: 401756 926L RB required due to proximity 3.48 Days
Daily		  
07-Feb-26 07:00 10-Feb-26 18:30 ALTALINK RB 926L (17s Benalto - 310p Sundance) removing tooling after raising str 926L4 Goes with SAP: 401755 922L RB required due to proximity 3.48 Days
Daily		  
07-Feb-26 07:00 07-Feb-26 17:00 EPCOR TE RTU/SCADA (Garneau) Garneau - substation firewall replacement, full communications outage 10 Hours
Continuous		  
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), H726 (EP Hardisty) Hardisty: TX2 Relay Maintenance 4.42 Days
Continuous		  
09-Feb-26 07:00 09-Feb-26 12:00 EPCOR Outage G721 (Garneau) Garneau: G721 Relay Maintenance 5 Hours
Continuous		  
09-Feb-26 07:00 14-Feb-26 17:00 EPCOR Outage T2 (EP Riverview), RW2402 (EP Riverview), RW2403 (EP Riverview) Riverview: TX2 Zone, Scaffold Build for Emergency Bushing Replacement 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 10-Feb-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 77s RTU/SCADA (77s Sagitawah) upgrade 77s MPLS nodes 1.38 Days
Daily		  
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 09-Feb-26 16:00 ALTALINK TE 297s RTU/SCADA (297s Rimbey), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
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 09-Feb-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) settings change 9 Hours
Daily		  
09-Feb-26 08:00 09-Feb-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) settings change 9 Hours
Daily		  
09-Feb-26 08:00 09-Feb-26 17:00 ALTALINK TE 510s Protection & Control (510s Sunnybrook) remote settings change 9 Hours
Daily		  
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 18-Feb-26 13:00 ATCO Outage 9L57 (939s Livock - 960s Birchwood Creek) 9L57 Line to Ground Clearance Mitigation 9.17 Days
Continuous		  
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 09-Feb-26 16:00 ATCO TE 849s Protection & Control (849s Joslyn Creek) PRC-005 relay testing on 87BA/900BS1 and 87BB/900BS1 7 Hours
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 09:00 09-Feb-26 10:00 ATCO TE ATCO Telecom Equipment, 950s RTU/SCADA (950s Germain), 878s RTU/SCADA (878s Kidney Lake) upgrading 'A' SAR OS TO V21, then V22 60 Mins
Continuous		  
09-Feb-26 10:00 09-Feb-26 17:00 ALTALINK TE 426s Protection & Control (426s Coalspur) maintenance on under frequency protection 7 Hours
Daily		  
09-Feb-26 10:00 09-Feb-26 17:00 ALTALINK TE 367s Protection & Control (367s Harry Smith) PRC maintenance on line protections 1043L A21/79/L13, 1043L B21/L13 7 Hours
Daily		  
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 10:00 10-Feb-26 17:00 ALTALINK TE 447s RTU/SCADA (447s Enchant) replace HMI with non monitored SEL-3354, investigating T1 SCADA analogs mismatch 31 Hours
Daily		  
09-Feb-26 11:00 10-Feb-26 19:00 ALTALINK TE 447s Protection & Control (447s Enchant) standard maintenance on T1 protection - T1 B51NN/T1, T1 B50/51-A/T1, T1 B50/51-B/T1, T1 B50/51-C/T1, T1 A87/T1 1.33 Days
Daily		  
09-Feb-26 12:00 09-Feb-26 17:00 EPCOR Outage G722 (Garneau) Garneau: G722 Relay Maintenance 5 Hours
Continuous		  
10-Feb-26 07:00 10-Feb-26 17:00 EPCOR Outage EP 511s V724 (EP 511s Victoria) Victoria: V724, Switching School Recertification 10 Hours
Continuous		  
10-Feb-26 07:00 10-Feb-26 12:00 EPCOR Outage G723 (Garneau) Garneau: G723 Relay Maintenance 5 Hours
Continuous		  
10-Feb-26 07:30 10-Feb-26 12:30 ALTALINK Outage 714L (397s Benbow – 1117s South Kaybob), 397s 714 (397s Benbow) implement new 352 (397s685) breaker fail trips to 397s714 5 Hours
Daily		  
10-Feb-26 07:30 11-Feb-26 17:00 ATCO TE 732s Protection & Control (732s Mitsue) Relay maintenance 1.4 Days
Continuous		  
10-Feb-26 08:00 11-Feb-26 17:00 ALTALINK TE 602s Protection & Control (602s Cold Creek) relay maintenance 1.38 Days
Daily		  
10-Feb-26 08:00 10-Feb-26 12:00 ENMAX Outage 26.81L (SS-26 - SS-32), 32B138-26.81 (SS-32), 26B138-26.81 (SS-26) cutover bus differential CT to new Z31/Z32 panel 4 Hours
Continuous		  
10-Feb-26 08:00 10-Feb-26 16:00 ALTALINK TE 262s RTU/SCADA (262s Rocky Mountain House), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Daily		  
10-Feb-26 08:00 10-Feb-26 17:00 ALTALINK TE 681s Protection & Control (681s Bannerman) remote settings change 9 Hours
Daily		  
10-Feb-26 08:00 10-Feb-26 17:00 ALTALINK TE 651s Protection & Control (651s Kirby) remote settings change 9 Hours
Daily		  
10-Feb-26 08:00 10-Feb-26 17:00 ALTALINK TE 701s Protection & Control (701s Blue Ridge Lumber) remote settings change 9 Hours
Daily		  
10-Feb-26 08:00 10-Feb-26 17:00 ALTALINK TE 410s Protection & Control (410s Josephburg) remote settings change 9 Hours
Daily		  
10-Feb-26 08:00 10-Feb-26 17:00 ATCO Outage 7L63 (780s Lubicon - 812s Norcen) changing rotten cross arm str 86 and str 1115 9 Hours
Continuous		  
10-Feb-26 08:00 10-Feb-26 17:00 ALTALINK TE 723s Protection & Control (723s Christina Lake) Relay settings maintenance 9 Hours
Daily		  
10-Feb-26 09:00 11-Feb-26 17:00 ATCO TE 732s RTU/SCADA (732s Mitsue) update to the SCADA to resolve a deficiency for tap position display on the local HMI 1.33 Days
Continuous		  
10-Feb-26 09:30 10-Feb-26 18:00 ALTALINK Outage 706L (54s Fort Saskatchewan - 706AL tap), 54s 706N (54s Fort Saskatchewan) high load move between structures 34-35 8.5 Hours
Daily		  
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		  
10-Feb-26 12:00 10-Feb-26 17:00 EPCOR Outage G724 (Garneau) Garneau: G724 Relay Maintenance 5 Hours
Continuous		  
10-Feb-26 12:00 10-Feb-26 16:00 ENMAX Outage 32B138-32BT5 (SS-32) 32BT5 P&C cut over 4 Hours
Continuous		  
11-Feb-26 06:00 11-Feb-26 17:00 ATCO IO ATCO RTU/SCADA SOC2 backup control centre activation

system operation will perform the failover to soc2 edmonton, all the system management and operations would be managed from soc2		 11 Hours
Continuous		  
11-Feb-26 07:00 11-Feb-26 17:00 EPCOR Outage EP 511s V725 (EP 511s Victoria) victoria: v725, switching school recertification 10 Hours
Continuous		  
11-Feb-26 07:00 11-Feb-26 12:00 EPCOR Outage G725 (Garneau) garneau: g725 relay maintenance 5 Hours
Continuous		  
11-Feb-26 07:30 11-Feb-26 12:30 ALTALINK Outage 397s 31 (397s Benbow), 397s T2 (397s Benbow) implement new 352 (397s685) breaker fail trips to 397s31 5 Hours
Daily		  
11-Feb-26 08:00 11-Feb-26 17:00 ALTALINK TE 336s RTU/SCADA (336s Fincastle) replace the ribbon cable connected from the D20 main board and the back plane 9 Hours
Daily		  
11-Feb-26 08:00 11-Feb-26 12:00 ENMAX Outage 32.2TR (SS-32) 32sub construction. cutover bus diff ct to new z31/z32 panel 4 Hours
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 08:00 11-Feb-26 16:00 ALTALINK TE 250p RTU/SCADA (250P Bighorn Plant), AltaLink Telecom Equipment split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Daily		  
11-Feb-26 08:00 12-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) 29PL9-17 01R-A (RED 670) at 29PJ-0234, 29EDD-1X - configuration changes (ABB) - 300603845
29EDD1 DFR updates
 1.5 Days
Continuous		  
11-Feb-26 08:30 12-Feb-26 17:00 ALTALINK TE 324s Protection & Control (324s Cassils) upgrade relay firmware version and DSP cards as per CIP007 requirements 1.35 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 09:00 11-Feb-26 16:00 ATCO TE 846s Protection & Control (846s Grand Centre) PRC-005 relay testing 7 Hours
Continuous		  
11-Feb-26 09:30 12-Feb-26 17:00 ALTALINK TE 39s Protection & Control (39s Bickerdike) card replacement 31.5 Hours
Daily		  
11-Feb-26 12:01 11-Feb-26 17:00 EPCOR Outage G726 (Garneau) garneau: g726 relay maintenance 4.98 Hours
Continuous		  
11-Feb-26 12:01 11-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		  
11-Feb-26 12:30 11-Feb-26 17:30 ALTALINK Outage 397s 39 (397s Benbow), 397s T1 (397s Benbow) implement new 352 (397s685) breaker fail trips to 397s39 5 Hours
Daily		  
12-Feb-26 07:00 13-Feb-26 17:00 EPCOR Outage EP 511s Victoria T1 (EP 511s Victoria), EP 511s V721 (EP 511s Victoria), EP 511s V722 (EP 511s Victoria) Victoria: TX1 zone, relay maintenance and SCADA RTU upgrade 1.42 Days
Continuous		  
12-Feb-26 07:00 12-Feb-26 18:00 ALTALINK Outage 700L (422s Westwood - 746L tap), 700L (746s Sherwood Park - 746L tap) 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 17:00 ATCO Outage 7L63 (788s Hotchkiss - 7LA63 tap) changing rotten cross arm str 86 and str 1115 9 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 at PCC and BCC. Lethbridge will be operating from PCC and BCC during the upgrades. 2 Hours
Continuous		  
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 07:00 23-Feb-26 17:30 ALTALINK RB 759L (87s Gaetz - 276s Prentiss) stringing new lines under construction 10.44 Days
Continuous		  
13-Feb-26 08:00 13-Feb-26 12:00 ENMAX Outage 40.1TR (SS-40) 40.1TR Silica Gel breather piping (1" liquid tight ) broken/replace 4 Hours
Continuous		  

Prepared On:   2026-02-04   1:45:12 PM

This document and the information contained herein are based upon information and data which by their nature contain a degree of uncertainty and are subject to change. In addition, this document may contain information and data from public sources and/or third parties, which have been assumed to be accurate and complete and have not been verified. Accordingly, the Independent System Operator, operating as the Alberta Electric System Operator (the "AESO") makes no warranty, representation or guarantee, express or implied, with respect to this document or the information contained herein, including, but not limited to, any warranty, representation or guarantee of accuracy, completeness, timeliness, reliability, availability, absence of computer virus, non- infringement, merchantability or suitability for any purpose. Under no circumstances will the AESO, its members, officers, employees, contractors or agents, or any of their respective affiliates, be liable for any errors or omissions in, or any losses, damages or claims whatsoever, whether in contract, tort or otherwise, arising from use of or reliance upon, this document or any information contained herein.

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