Alberta Electric System Operator
System Co-ordination Plan
2025-12-11 to 2026-01-09
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		  
11-Mar-25 00:00 12-Jan-26 16:00 ALTALINK Outage 377s 473C (377s AML Hardisty) forced outage 307.71 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 19-Dec-25 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 263.46 Days
Continuous		  
14-May-25 08:00 10-Feb-26 16:00 ENMAX TE Protection & Control (SS-32) 32sub 138kV autoswitching protection outage 272.38 Days
Continuous		  
13-Jun-25 17:00 11-Feb-26 17:00 EPCOR Outage T3 (Rossdale) Rossdale - TX3 LCR 243.04 Days
Continuous		  
21-Jul-25 09:00 19-Jan-26 17:00 ATCO TE 732s Protection & Control (732s Mitsue) the breaker fail protection will be disabled during the project, as we migrate from the existing to the new protection 182.38 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 12-Jan-26 16:30 ALTALINK Outage 263s C1 (263s Strachan) forced outage 174.38 Days
Continuous		  
25-Jul-25 17:01 20-Feb-26 17:00 EPCOR Outage T2 (EP Riverview) bushing test failure (found during OE110184) 210.04 Days
Continuous		  
20-Aug-25 17:00 17-Dec-25 17:00 ALTALINK Outage 1075L (28s West Brooks - 132s Ware Junction) restoration from real time storm 119.04 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		  
25-Aug-25 09:00 11-Dec-25 17:00 ATCO TE 710s Protection & Control (710s Vermilion) protection and hardwired IO on-site will need to be cut-over to the new SCADA system and tested 108.38 Days
Continuous		  
02-Sep-25 08:00 28-Feb-26 16:00 ENMAX Outage 38.1C (SS-38) capacitor bank switcher replacement 179.38 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		  
03-Nov-25 07:00 19-Dec-25 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking for P&C maintenance at Cloverbar 46.42 Days
Continuous		  
12-Nov-25 08:00 12-Dec-25 16:00 ENMAX Outage 20.1TR (SS-20), 20BA8-20.1TR (SS-20), 20BB8-20.1TR (SS-20) maintenance 30.33 Days
Continuous		  
17-Nov-25 07:00 11-Dec-25 17:00 EPCOR TE 814s Protection & Control (814s Bellamy) protection blocking, DFR commissioning 24.42 Days
Continuous		  
21-Nov-25 08:00 09-Jan-26 16:00 ENMAX Outage 38.3TR (SS-38) 38.3TR secondary cable replacement 49.33 Days
Continuous		  
24-Nov-25 07:00 11-Dec-25 17:00 ENMAX TE Protection & Control (SS-10) 10 sub 138KV bus diff protection outage, 10.1TR and 10.2TR 'S' protection replacement 17.42 Days
Daily		  
24-Nov-25 07:00 11-Dec-25 17:00 ENMAX TE Protection & Control (SS-10) 10PT138-Z31 secondary outage, 10.1TR and 10.2TR 'S' protection replacement 17.42 Days
Daily		  
24-Nov-25 07:00 11-Dec-25 17:00 ENMAX TE Protection & Control (SS-10) 10sub auto switching scheme outage, 10.1TR and 10.2TR 'S' protection replacement 17.42 Days
Daily		  
25-Nov-25 17:46 25-Jan-26 18:00 ATCO Outage 876s 901T (876s Brintnell) forced outage oil leaking 61.01 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		  
01-Dec-25 07:00 18-Dec-25 18:00 ENMAX TE Protection & Control (SS-39) 39s auto-switching scheme protection outage, SS-39 HV SW replacement 17.46 Days
Daily		  
01-Dec-25 08:00 18-Dec-25 16:00 ENMAX Outage 31.84L (SS-31 - SS-32), 31B138-31.84 (SS-31), 32B138-31.84 (SS-32) 31.84L P&C cut over 17.33 Days
Continuous		  
01-Dec-25 08:00 12-Dec-25 16:00 Syncrude TE Aurora RTU/SCADA (Aurora) RTU replacement 11.33 Days
Continuous		  
01-Dec-25 08:00 19-Dec-25 12:30 ENMAX Outage 39.82L (SS-39 - SS-162), 22.81L (SS-22 - SS-39), 39.2TR (SS-39), 39.4TR (SS-39), 22B138-22.81 (SS-22), 39B138-22.81 (SS-39), 39B138-39.82 (SS-39), SW83 (SS-39), 39MD138-39.2TR (SS-39), 39MD138-39.4TR (SS-39) HV switch replacement 18.19 Days
Continuous		  
01-Dec-25 08:00 12-Dec-25 17:00 ALTALINK TE 397s RTU/SCADA (397s Benbow) update configuration for L2 protection upgrades, 43m, and AIS 1159, 96/252, 96/452, B87/138B1 additions 11.38 Days
Daily		  
01-Dec-25 08:00 12-Dec-25 17:00 ALTALINK TE 397s Protection & Control (397s Benbow) settings changes and testing 11.38 Days
Daily		  
01-Dec-25 09:00 16-Dec-25 17:00 BCH Outage 1L274 (48s Pocaterra - 978s BCH Britt Creek) for LLP work 15.33 Days
Daily		 AB-BC
01-Dec-25 09:00 16-Dec-25 17:00 ALTALINK IO 887L (48s Pocaterra - 978s BCH Britt Creek) hazard tree removal along various sections of circuit near Elk Lakes provincial park 15.33 Days
Daily		  
01-Dec-25 10:00 12-Dec-25 17:30 ATCO TE 977s RTU/SCADA (977s Salt Creek) RTU update 11.31 Days
Continuous		  
01-Dec-25 10:00 12-Dec-25 17:30 ATCO TE 845s Protection & Control (845s Big Mountain), 845s RTU/SCADA (845s Big Mountain) 7L33 protection upgrade
- upgrade SCADA
 11.31 Days
Continuous		  
01-Dec-25 10:00 12-Dec-25 16:00 ATCO TE 977s Protection & Control (977s Salt Creek) PRC-005 testing - troubleshoot S/C operations fail 11.25 Days
Continuous		  
01-Dec-25 10:00 12-Dec-25 16:00 ATCO TE 745s RTU/SCADA (745s Slave Lake) install new BMS controller and modules on battery bank 11.25 Days
Continuous		  
01-Dec-25 12:00 12-Dec-25 16:00 ATCO TE 898s Heart Lake RTU/SCADA install battery monitoring system, update station controller configuration for BMS connection, test new alarms 11.17 Days
Continuous		  
02-Dec-25 13:00 11-Dec-25 13:00 ENMAX, ALTALINK Outage 10B138-693 (SS-10), 693L (42s Sarcee - SS-10), 10.2TR (SS-10), 10MD138-10.2TR (SS-10) protection replacement., trip test, protection operation 9 Days
Continuous		  
02-Dec-25 13:00 11-Dec-25 09:00 ENMAX, ALTALINK IO 693L (42s Sarcee - SS-10) protection replacement., trip test, protection operation 8.83 Days
Continuous		  
04-Dec-25 07:00 19-Dec-25 18:00 ALTALINK RB 1053L (132s Ware Junction - 324s Cassils) due to proximity to 931L 15.46 Days
Daily		  
04-Dec-25 11:00 19-Dec-25 18:00 ALTALINK Outage 931L (28s West Brooks - 132s Ware Junction) install new structures as part of the 1075L storm restoration. 15.29 Days
Continuous		  
08-Dec-25 07:00 11-Dec-25 17:00 EPCOR, ALTALINK Outage 240BA3 (629s Argyll Transfer Station - 814s Bellamy), 1055L (629s Argyll Transfer Station - 816s Petrolia), 814s B2406 (814s Bellamy), 814s B2407 (814s Bellamy), 814s BDS20 (814s Bellamy) 240BA3 metering upgrade cutovers 3.42 Days
Continuous		  
08-Dec-25 07:00 12-Dec-25 17:00 EPCOR Outage 557s T1 (557s Castle Downs) surge arrestor LCR 4.42 Days
Continuous		  
08-Dec-25 07:00 11-Dec-25 17:00 ALTALINK, EPCOR IO 1055L (629s Argyll Transfer Station - 816s Petrolia) 240BA3 metering upgrade cutovers 3.42 Days
Continuous		  
08-Dec-25 07:00 14-Dec-25 19:00 ATCO RB 7L143 (766s Nevis - 769s Stettler) facilitate work adjacent to line for CETO project 6.5 Days
Continuous		  
08-Dec-25 07:00 15-Dec-25 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 7.46 Days
Continuous		  
08-Dec-25 08:00 11-Dec-25 17:00 ATCO TE 732s Protection & Control (732s Mitsue) block 87TB/902T transformer protection to verify out of service upstream bus relay CT inputs, wiring changes may be required 3.38 Days
Continuous		  
08-Dec-25 08:00 12-Dec-25 17:00 ATCO RB 7L86 (822s Wolf Lake - 1200s Foster Creek) L-G clearance mitigation pole changes 4.38 Days
Continuous		  
08-Dec-25 08:00 12-Dec-25 17:00 ALTALINK TE 39s RTU/SCADA (39s Bickerdike) update config for AIS 1159 additions 4.38 Days
Daily		  
08-Dec-25 08:00 12-Dec-25 17:00 ALTALINK TE 1012s RTU/SCADA (1012s Deer Hill) update config for AIS 1159 additions, and 43M addition 4.38 Days
Daily		  
08-Dec-25 08:00 12-Dec-25 17:00 ALTALINK TE 1012s Protection & Control (1012s Deer Hill) settings changes & testing on A21/L2, B21/L2, A21/L1, & B21/L1 for 1159AIS scheme 4.38 Days
Daily		  
08-Dec-25 09:00 12-Dec-25 17:00 ATCO TE ATCO Telecom Equipment, 727s RTU/SCADA (727s Kinuso) Kinuso_S-Telecom- installing a new panel 4.33 Days
Continuous		  
08-Dec-25 10:00 12-Dec-25 17:30 ATCO TE 749s Flyingshot Lake Protection & Control, 749s Flyingshot Lake RTU/SCADA 7L33 protection upgrade
, upgrade SCADA		 4.31 Days
Continuous		  
08-Dec-25 10:00 12-Dec-25 17:00 ALTALINK TE 39s Protection & Control (39s Bickerdike) settings changes & testing on A21/L1 & B21/L1 for 1159AIS scheme 4.29 Days
Daily		  
08-Dec-25 11:00 12-Dec-25 17:00 ALTALINK TE 205s RTU/SCADA (205s Castle Rock Ridge) SCADA upgrade - alarm splitting, RTU config updates 4.25 Days
Daily		  
08-Dec-25 11:00 12-Dec-25 17:00 ALTALINK TE 58s RTU/SCADA (58s Edson) RTU database updates 4.25 Days
Daily		  
08-Dec-25 11:00 12-Dec-25 17:00 ALTALINK TE 207s RTU/SCADA (207s Pinedale) RTU database updates 4.25 Days
Daily		  
08-Dec-25 11:00 12-Dec-25 17:00 ALTALINK, CascadeP TE 1047s RTU/SCADA (1047s Whisky Jack) RTU database updates 4.25 Days
Daily		  
08-Dec-25 12:00 12-Dec-25 16:00 ATCO TE 960s Protection & Control (960s Birchwood Creek) complete relay testing 4.17 Days
Continuous		  
08-Dec-25 12:00 11-Dec-25 17:00 ALTALINK TE 263s RTU/SCADA (263s Strachan) update configurations on RTU 3.21 Days
Daily		  
08-Dec-25 13:00 12-Dec-25 17:00 ATCO Outage 9L40 (732s Mitsue - 809s Louise Creek), 732s 901 (732s Mitsue), 732s 902 (732s Mitsue), 732s 9L40D2 (732s Mitsue), 732s 902B (732s MItsue), 732s 901B (732s MItsue) 240kV bus and 144kV breaker fail protection upgrade and SCADA upgrade 4.17 Days
Continuous		  
09-Dec-25 07:00 12-Dec-25 17:30 ALTALINK Outage 38s 7252 (38s East Edmonton) replace CTs 3.44 Days
Continuous		  
09-Dec-25 07:00 12-Dec-25 17:30 ALTALINK, EPCOR RB 915L (38s East Edmonton - 987s Clover Bar) Altalink working on 38s7252 3.44 Days
Continuous		  
09-Dec-25 08:00 11-Dec-25 17:00 ALTALINK, EXPPIPE TE AltaLink Telecom Equipment, 329s RTU/SCADA (329s Hrt Express) update MPLS Node 2.38 Days
Daily		  
09-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE 429s RTU/SCADA (429s Nelson Lake), AltaLink Telecom Equipment update MPLS node 2.38 Days
Daily		  
09-Dec-25 09:00 11-Dec-25 17:00 ATCO TE ATCO Telecom Equipment flat top telecom replacement of existing damaged elliptical wave guide, dish facing Mitsue 2.33 Days
Continuous		  
09-Dec-25 09:00 11-Dec-25 17:00 ATCO TE ATCO Telecom Equipment, 766s RTU/SCADA (766s Nevis) firewall install 2.33 Days
Continuous		  
09-Dec-25 09:00 19-Dec-25 17:00 BCH Outage 5L52 (BPA Custer - BCH Ingledow) make emergent glass replacement on the circuit 10.33 Days
Continuous		 AB-BC
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		  
10-Dec-25 07:00 11-Dec-25 16:00 ATCO Outage 7L130 (705s Kitscoty - 710s Vermilion), 710s 702 (710s Vermilion), 705s 704 (705s Kitscoty) conductor inspection 1.38 Days
Continuous		  
10-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE 852s RTU/SCADA (852s Round Hill), AltaLink Telecom Equipment MPLS upgrade 1.38 Days
Continuous		  
10-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) standard relay maintenance 1.38 Days
Daily		  
10-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE 77s RTU/SCADA (77s Sagitawah) firmware update 1.38 Days
Daily		  
11-Dec-25 07:00 11-Dec-25 18:00 ENMAX TE Protection & Control (SS-10), 10.2TR (SS-10) 10.2TR 'A' & 'B' protection outage, trip testing 11 Hours
Continuous		  
11-Dec-25 07:00 12-Dec-25 17:00 EPCOR Outage T1 (Woodcroft), W721 (Woodcroft), W722 (Woodcroft), WDS3 (Woodcroft) woodcroft: tx1 zone, wab1 repair 1.42 Days
Continuous		  
11-Dec-25 07:30 11-Dec-25 12:30 ALTALINK Outage 205s 352 (205s Castle Rock Ridge) acc visibility scada upgrade - alarm splitting + wiring modifications 5 Hours
Daily		  
11-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE 445s RTU/SCADA (445s Elk River) investigate issues with low receive levels 9 Hours
Daily		  
11-Dec-25 08:00 11-Dec-25 10:30 ALTALINK Outage 63s T3 (63s Red Deer), 63s 26 (63s Red Deer) 63s26 Gas top up to eliminate nuisance alarming 2.5 Hours
Daily		  
11-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE 378s Protection & Control (378s Shell Caroline) dps card replacement/minor, firmware update on the following line protection: 848L B21/L1 9 Hours
Daily		  
11-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE 356s RTU/SCADA (356s Milo) maintenance 9 Hours
Daily		  
11-Dec-25 08:00 14-Dec-25 16:00 ATCO RB 7L46 (813s Little Smoky - 845s Big Mountain) high load move 7L46 3.33 Days
Continuous		  
11-Dec-25 08:00 14-Dec-25 16:00 ATCO RB 7L45 (798s Bridge Creek - 845s Big Mountain), 7L45 (798s Bridge Creek - 813s Little Smoky) high load move 7L45 3.33 Days
Continuous		  
11-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE 395s Protection & Control (395s North Holden) standard relay maintenance 9 Hours
Daily		  
11-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE AltaLink Telecom Equipment 946s MPLS node update 9 Hours
Daily		  
11-Dec-25 08:00 11-Dec-25 17:00 ALTALINK TE AltaLink Telecom Equipment complete MPLS upgrade 9 Hours
Daily		  
11-Dec-25 09:00 11-Dec-25 16:00 ENMAX, ALTALINK IO 832L (SS-10 - SS-12) trip testing 10BA8-10.1TR, 10BB8-10.1TR, 10B138-832 7 Hours
Daily		  
11-Dec-25 09:00 11-Dec-25 16:00 ATCO Outage 700s 706C (700s Bonnyville) replace rtxp test switch for 87V/705C @ 700S 7 Hours
Continuous		  
11-Dec-25 09:00 12-Dec-25 17:00 BCH TE 5L92 (BCH Cranbrook - BCH Selkirk), 2L294 (BCH A. A. Lambert - BCH Cranbrook), 5L94 (BCH Cranbrook - 102s Langdon) maintenance 1.33 Days
Continuous		  
11-Dec-25 09:00 12-Dec-25 17:00 ALTALINK IO 1201L (520s Bennett - BCH Cranbrook) CBK 5L94 PYPN & SYPN OOS one at a time 1.33 Days
Continuous		  
11-Dec-25 10:00 11-Dec-25 17:30 ATCO TE 813s RTU/SCADA (813s Little Smoky) replace HMI DVI KVM switch 7.5 Hours
Continuous		  
11-Dec-25 10:00 11-Dec-25 16:00 ALTALINK Outage 1325L (510s Sunnybrook - AML 511s Crossings), 510s T11 (510s Sunnybrook), AML 511s T11 (AML 511s Crossings), 510s 2652 (510s Sunnybrook), 510s 2752 (510s Sunnybrook), 510s 41 (510s Sunnybrook), 510s 40 (510s Sunnybrook), 510s 43 (510s Sunnybrook), 510s 44 (510s Sunnybrook), 510s 4289 (510s Sunnybrook), AML 511s 1489 (AML 511s Crossings), 510s Protection & Control (510s Sunnybrook) take the HVDC link to stopped state 6 Hours
Daily		  
11-Dec-25 12:31 11-Dec-25 17:30 ALTALINK Outage 205s 452 (205s Castle Rock Ridge) acc visibility scada upgrade - alarm splitting + wiring modifications 4.98 Hours
Continuous		  
11-Dec-25 14:00 11-Dec-25 18:00 ENMAX, ALTALINK Outage 832L (SS-10 - SS-12), 10.1TR (SS-10), 10B138-832 (SS-10), 10MD138-10.1TR (SS-10), Protection & Control (SS-10) trip testing 10BA8-10.1TR, 10BB8-10.1TR, 10B138-832 4 Hours
Continuous		  
12-Dec-25 07:00 12-Dec-25 17:00 EPCOR Outage EP 511s V724 (EP 511s Victoria) switching school training 10 Hours
Continuous		  
12-Dec-25 07:30 12-Dec-25 12:30 ALTALINK Outage 205s 152 (205s Castle Rock Ridge) SCADA upgrade - alarm splitting + wiring modifications 5 Hours
Daily		  
12-Dec-25 08:00 12-Dec-25 16:00 ENMAX Outage 15.60L (SS-15 - SS-21) 15.60L SEL-311L ASW logic correction 8 Hours
Continuous		  
13-Dec-25 07:00 13-Dec-25 17:00 EPCOR TE EP 511s Protection & Control (EP 511s Victoria) protection blocking, relay maintenance 10 Hours
Continuous		  
13-Dec-25 08:00 14-Dec-25 16:00 ENMAX, ALTALINK Outage 20.82L (SS-20 - SS-21), 21.80L (42s Sarcee - SS-21), 21.1TR (SS-21), 21.4TR (SS-21), 21B138-20.82 (SS-21), 21B138-21.80 (SS-21), 21B69-21.4TR (SS-21), 20B138-20.82 (SS-20), 42s 21 (42s Sarcee), 21MD138-21.1TR (SS-21), 21MD138-21.4TR (SS-21), SW64 (SS-21) 21.1TR replacement, punch bolts into plate 1.33 Days
Continuous		  
13-Dec-25 08:00 14-Dec-25 16:00 ENMAX, ALTALINK IO 21.80L (42s Sarcee - SS-21) 21.1TR replacement, punch bolts into plate 1.33 Days
Continuous		  
13-Dec-25 08:00 14-Dec-25 17:00 ENMAX, ALTALINK TE 50L (44s Bearspaw Plant - SS-21) ENMAX request for techs to disable line protections to de-energize 60s100, 60s50L, line protection, A21/50L and B21/50L 1.38 Days
Daily		  
13-Dec-25 08:00 13-Dec-25 16:00 ENMAX Outage 9.83L (SS-9 - SS-43) oil sampling cable 8 Hours
Continuous		  
13-Dec-25 09:00 13-Dec-25 11:00 EPCOR Outage EP 511s V721 (EP 511s Victoria), EP 511s V724 (EP 511s Victoria) relay maintenance 2 Hours
Continuous		  
13-Dec-25 12:00 13-Dec-25 14:00 EPCOR Outage EP 511s V729 (EP 511s Victoria) relay maintenance 2 Hours
Continuous		  
14-Dec-25 07:30 20-Dec-25 17:30 ALTALINK RB 793L (87s Gaetz - 535s Joffre) setting structures on 986L/962L str’s 25-55, working near str’s 31-65 on 793L 6.42 Days
Daily		  
15-Dec-25 07:00 19-Dec-25 17:00 EPCOR Outage 557s T2 (557s Castle Downs) surge arrestor LCR 4.42 Days
Continuous		  
15-Dec-25 07:00 18-Dec-25 17:00 EPCOR Outage 72 kV Bus 2 (Rossdale), RW727 (Rossdale), VHBB1 (Rossdale), VHBB2 (Rossdale), RG725 (Rossdale), RV726 (Rossdale) Rossdale: BUS 2 Surge Arrestor Replacement 3.42 Days
Continuous		  
15-Dec-25 07:00 21-Dec-25 19:00 ATCO RB 7L143 (766s Nevis - 769s Stettler) facilitate work adjacent to line for CETO project 6.5 Days
Continuous		  
15-Dec-25 07:00 19-Dec-25 17:00 ALTALINK, EPCOR TE 1139L (367s Harry Smith - EP Riverview) protection blocking, relay maintenance 4.42 Days
Continuous		  
15-Dec-25 07:00 19-Dec-25 17:00 EPCOR TE 72NW15 (Namao - Woodcroft) protection blocking for 72NW15 line, CVT cutover 4.42 Days
Continuous		  
15-Dec-25 07:00 19-Dec-25 17:00 EPCOR TE 72KN23 (Kennedale - Namao) protection blocking for 72KN23 line, CVT cutover 4.42 Days
Continuous		  
15-Dec-25 07:00 19-Dec-25 17:00 EPCOR TE 72VN21 (EP 511s Victoria - Namao) protection blocking for 72VN21 line, CVT cutover 4.42 Days
Continuous		  
15-Dec-25 07:00 16-Dec-25 17:00 EPCOR Outage RW2405 (EP Riverview) emergency tank heater repair 1.42 Days
Continuous		  
15-Dec-25 08:00 16-Dec-25 17:00 ALTALINK TE 67s RTU/SCADA (67s Stirling) implement supervisory controls and indication to RAS-43 1.38 Days
Daily		  
15-Dec-25 08:00 16-Dec-25 17:00 ALTALINK TE 67s Protection & Control (67s Stirling) implement supervisory controls and indication to RAS 43 and investigate or configure remote access issues 1.38 Days
Daily		  
15-Dec-25 08:00 15-Dec-25 16:00 ENMAX, ALTALINK Outage 833L (SS-2 - SS-12), 12.2TR (SS-12), 12B138-833L (SS-12), 12MD138-12.2TR (SS-12), SW83 (SS-12), 2MD138-833L (SS-2) west phase not fully down on stops 8 Hours
Continuous		  
15-Dec-25 08:00 19-Dec-25 17:00 ALTALINK TE 267s RTU/SCADA (267s Killarney Lake) RTU database update 4.38 Days
Daily		  
15-Dec-25 08:00 15-Dec-25 16:00 ENMAX Outage 16.60L (SS-16 - SS-34) logic correction 8 Hours
Continuous		  
15-Dec-25 08:00 15-Dec-25 12:00 PEL TE 318s RTU/SCADA (318s Scoria) communication outage 4 Hours
Continuous		  
15-Dec-25 08:00 15-Dec-25 16:00 ENMAX TE RTU/SCADA (SS-31) SDN upgrade 8 Hours
Continuous		  
15-Dec-25 08:00 15-Dec-25 12:00 ALTALINK TE 356s Protection & Control (356s Milo) remote setting change - 356s 1097L_B87/21/L7 L90 4 Hours
Daily		  
15-Dec-25 08:00 15-Dec-25 17:00 ALTALINK TE 428s RTU/SCADA (428s Namaka) remove T2 Beckwith controls 9 Hours
Daily		  
15-Dec-25 08:00 19-Dec-25 17:00 ATCO RB 7L86 (822s Wolf Lake - 1200s Foster Creek) structure changes for line to ground clearance mitigation, live line work 4.38 Days
Continuous		  
15-Dec-25 08:00 15-Dec-25 16:00 ENMAX Outage 5.5TR (SS-5) I&R 5B13-5.5TR cell red light 8 Hours
Continuous		  
15-Dec-25 09:00 15-Dec-25 16:00 ENMAX, ALTALINK Outage 833L (SS-2 - SS-12) transfer from JMUX to JPAX circuits 7 Hours
Continuous		  
15-Dec-25 09:00 15-Dec-25 16:00 ENMAX, ALTALINK IO 833L (SS-2 - SS-12) transfer from JMUX to JPAX circuits 7 Hours
Continuous		  
15-Dec-25 09:00 19-Dec-25 16:00 ATCO RB 7L171 (802s Michichi Creek - 804s Wintering Hills) installing marker cones at critical crossing span 7L171-622 to 7L171-623 4.29 Days
Continuous		  
15-Dec-25 09:00 16-Dec-25 18:00 ALTALINK Outage 744L (235s Entwistle - 744AL tap), 235s 744W (235s Entwistle) install dampers at structures 97A, 96A, 94A, 7 1.38 Days
Continuous		  
15-Dec-25 09:00 16-Dec-25 17:00 ENMAX Outage 31.1C (SS-31) 31 sub capacitor bank CT wiring change / deficiency 1.33 Days
Continuous		  
15-Dec-25 10:00 16-Dec-25 17:30 ATCO Outage 959s SVC (959s Lanfine), 959s 921 (959s Lanfine) troubleshoot cause of recent SVC tripping event 31.5 Hours
Continuous		  
15-Dec-25 10:00 19-Dec-25 16:00 ATCO TE 716s RTU/SCADA (716s Lloydminster) transfer station DC to temporary battery bank, replace battery bank, install battery monitoring system, update station controller configuration for BMS connection, test new alarms 4.25 Days
Continuous		  
15-Dec-25 10:00 16-Dec-25 17:00 ALTALINK TE 108s RTU/SCADA (108s Amelia) RTU database update 31 Hours
Daily		  
15-Dec-25 10:00 18-Dec-25 17:30 ATCO TE 749s Flyingshot Lake Protection & Control PPRC-005 auxiliary trip relay testing 3.31 Days
Continuous		  
15-Dec-25 10:00 16-Dec-25 17:00 ATCO TE ATCO Telecom Equipment, 784s RTU/SCADA (784s Donnelly) cutover of the site to new switch will take place Dec 16 31 Hours
Continuous		  
15-Dec-25 11:00 19-Dec-25 17:30 ALTALINK TE 272s RTU/SCADA (272s Springbank) implement supervisory controls and indication for sectionalizer 4.27 Days
Daily		  
15-Dec-25 11:30 15-Dec-25 17:30 ALTALINK Outage 535s 6452 (535s Joffre) urgent replace failing tank heaters 6 Hours
Continuous		  
15-Dec-25 11:30 16-Dec-25 17:00 ALTALINK TE 140s Protection & Control (140s Thompson) replace DSP cards and maintenance 29.5 Hours
Continuous		  
15-Dec-25 12:00 16-Dec-25 16:00 ATCO TE 2005s Protection & Control (2005s Secord) complete relay testing 28 Hours
Continuous		  
15-Dec-25 13:00 16-Dec-25 17:00 ALTALINK TE 17s Protection & Control (17s Benalto) card replacement affecting 240B2 - B87 relays 28 Hours
Continuous		  
16-Dec-25 08:00 16-Dec-25 16:00 ALTALINK Outage 225L (67s Stirling - 225AL tap), 67s 225 (67s Stirling) breaker 352 (s225) alarm splitting 8 Hours
Daily		  
16-Dec-25 08:00 16-Dec-25 17:00 ALTALINK TE 358s RTU/SCADA (358s Amoco Brazeau) investigate IED trouble on L3 MET 9 Hours
Daily		  
16-Dec-25 08:00 16-Dec-25 17:00 ALTALINK TE 358s Protection & Control (358s Amoco Brazeau) protection outage on U/F relay 2-1/81 to investigate VR1 voltage imbalance 9 Hours
Daily		  
16-Dec-25 08:00 16-Dec-25 12:00 ENMAX Outage 33.83L (SS-33 - SS-41), 41B138-33.83 (SS-41), 33B138-33.83 (SS-33) breaker trip circuit test - 41B138-33.83 4 Hours
Continuous		  
16-Dec-25 08:00 16-Dec-25 12:00 ENMAX TE Protection & Control (SS-24) 24 sub auto-switching protection scheme outage, I&R 24 Sub GE C30 internal battery fail 4 Hours
Continuous		  
16-Dec-25 08:00 18-Dec-25 18:00 ALTALINK TE 520s RTU/SCADA (520s Bennett) update RTU to add supervisory control and indication for RAS-11 2.42 Days
Daily		  
16-Dec-25 08:00 16-Dec-25 12:00 ENMAX Outage 14.2TR (SS-14) LV breaker maintenance 4 Hours
Continuous		  
16-Dec-25 08:00 18-Dec-25 16:00 ALTALINK TE 520s Protection & Control (520s Bennett) add E/D control to RAS 11 and RAS 12 2.33 Days
Daily		  
16-Dec-25 08:30 16-Dec-25 12:30 ATCO TE ATCO Telecom Equipment, 845s Protection & Control (845s Big Mountain), 749s Flyingshot Lake Protection & Control replace RF cables on the IRU and troubleshoot alarms 4 Hours
Continuous		  
16-Dec-25 09:00 16-Dec-25 12:00 ENMAX Outage 1.82L (SS-1 - SS-5) transfer from JMUX to JPAX circuits 3 Hours
Continuous		  
16-Dec-25 09:00 16-Dec-25 17:00 ALTALINK TE 108s Protection & Control (108s Amelia) card replacement 8 Hours
Daily		  
16-Dec-25 09:00 19-Dec-25 20:00 SUNCOR IO 29EDD-1 Protection & Control (29EDD-1 Millennium), 29EDD-94 Protection & Control (29EDD-94 Voyageur), 29EDD-34 Protection & Control (29EDD-34) DFR firmware upgrade 3.46 Days
Continuous		  
16-Dec-25 10:00 16-Dec-25 17:30 ATCO TE 809s Protection & Control (809s Louise Creek), 809s RTU/SCADA (809s Louise Creek) configuration update 7.5 Hours
Continuous		  
16-Dec-25 11:00 18-Dec-25 13:30 ALTALINK Outage 267s T1 (267s Killarney Lake) Install wildlife cover on 267s3 and VT3, Install tap changer position sensor and current loop interface, complete I- bridge install, establish supervisory controls and tap status to Beckwith and function test, complete T1 'S' protection demo 2.1 Days
Continuous		  
16-Dec-25 12:01 16-Dec-25 16:00 ENMAX Outage 1.84L (SS-1 - SS-5) Transfer from JMUX to JPAX circuits 3.98 Hours
Continuous		  
16-Dec-25 12:01 16-Dec-25 16:00 ENMAX Outage 54.81L (SS-54 - SS-65), 54B138-54.81 (SS-54) breaker trip circuit test 3.98 Hours
Continuous		  
17-Dec-25 07:00 17-Dec-25 17:00 ALTALINK, DOW TE 166s Protection & Control (166s Dow Chemical Fort Saskatchewan) card replacement 10 Hours
Daily		  
17-Dec-25 07:00 18-Dec-25 17:30 ALTALINK RB 759L (87s Gaetz - 276s Prentiss) install bird diverters on span 28-29 1.44 Days
Daily		  
17-Dec-25 08:00 17-Dec-25 17:00 ALTALINK TE 272s Protection & Control (272s Springbank) ACC visibility project wire and commission 272s 3L auto sectionalizer indication, alarms and remote controls 9 Hours
Daily		  
17-Dec-25 08:00 17-Dec-25 17:00 ALTALINK TE 63s Protection & Control (63s Red Deer) card replacement 9 Hours
Daily		  
17-Dec-25 08:00 17-Dec-25 11:00 ENMAX Outage 2B138-D91 (SS-2) breaker trip coil test - 2B138-D91 3 Hours
Continuous		  
17-Dec-25 08:00 17-Dec-25 17:30 ATCO TE 2075s Protection & Control (2075s Newell) download settings files and event reports from all POW relays 9.5 Hours
Continuous		  
17-Dec-25 08:00 17-Dec-25 20:00 SUNCOR TE Suncor RTU/SCADA (Suncor) replace main network routers for MCC and BCC 12 Hours
Continuous		  
17-Dec-25 08:30 18-Dec-25 17:00 ALTALINK TE 993s Protection & Control (993s Abee) replace DSP cards and maintenance 1.35 Days
Daily		  
17-Dec-25 08:30 18-Dec-25 17:00 ALTALINK TE 385s RTU/SCADA (385s Spring Coulee) configuration update to RTU, replace failing voltage resistor in station service AC cabinet 1.35 Days
Daily		  
17-Dec-25 08:30 17-Dec-25 12:00 ENMAX TE RTU/SCADA (SS-9) transfer of SCADA from JMUX to JPAX at substations in ring 2 3.5 Hours
Continuous		  
17-Dec-25 09:00 17-Dec-25 17:00 ATCO TE ATCO Telecom Equipment, 2029s RTU/SCADA (2029s Heathfield) Heathfield_S-Telecom- MED BES firewall install - outage to local network and SCADA communications 8 Hours
Continuous		  
17-Dec-25 09:00 17-Dec-25 16:00 ALTALINK Outage 744L (228s T.M.P.L. Niton - 744AL tap), 228s 744 (228s T.M.P.L. Niton) replace the gear box on 744L89B 7 Hours
Daily		  
17-Dec-25 09:30 18-Dec-25 16:00 ATCO TE 848s Protection & Control (848s Ruth Lake) complete relay testing 30.5 Hours
Continuous		  
17-Dec-25 09:30 18-Dec-25 17:30 ATCO Outage 813s SVC (813s Little Smoky), 813s 719 (813s Little Smoky) replace failed valve cooling pump 1.33 Days
Continuous		  
17-Dec-25 10:00 17-Dec-25 14:00 ALTALINK, TRANSALTA Outage 250p T1 (250p Bighorn Plant) maintenance 4 Hours
Daily		  
17-Dec-25 10:00 17-Dec-25 17:00 ALTALINK TE 89s RTU/SCADA (89s Ellerslie) firmware update 7 Hours
Daily		  
17-Dec-25 11:01 17-Dec-25 13:00 ENMAX Outage 2B138-D93 (SS-2) breaker trip coil test - 2B138-D93 119 Mins
Continuous		  
17-Dec-25 13:01 17-Dec-25 16:00 ENMAX Outage 2B138-D94 (SS-2) breaker trip coil test - 2B138-D94 2.98 Hours
Continuous		  
17-Dec-25 21:00 17-Dec-25 22:00 BCH IO 1L274 (BCH Elkford - BCH Elkford tap) PON submitted (PON #48393) to connect MO6, open EFT
1D23
 60 Mins
Continuous		  
17-Dec-25 21:00 17-Dec-25 22:00 BCH Outage 1L274 (BCH Elkford - BCH Elkford tap) PON submitted (PON #48393) to connect MO6, open EFT
1D23
 60 Mins
Continuous		 AB-BC
18-Dec-25 04:00 18-Dec-25 05:00 BCH IO 1L274 (BCH Elkford - BCH Elkford tap) PON submitted (PON #48393) to connect MO6. EFD station isolation will require a brief outage on 1L274 to open EFT
1D23
 60 Mins
Continuous		  
18-Dec-25 04:00 18-Dec-25 05:00 BCH Outage 1L274 (BCH Elkford - BCH Elkford tap) PON submitted (PON #48393) to connect MO6
 60 Mins
Continuous		 AB-BC
18-Dec-25 08:00 18-Dec-25 17:00 ALTALINK TE 484s RTU/SCADA (484s Millar Western) update configuration 9 Hours
Daily		  
18-Dec-25 08:00 18-Dec-25 13:00 ALTALINK TE 332s Protection & Control (332s Ellis) card replacements 5 Hours
Daily		  
18-Dec-25 08:00 18-Dec-25 11:00 ENMAX Outage 2B138-D95 (SS-2) breaker trip coil test - 2B138-D95 3 Hours
Continuous		  
18-Dec-25 10:00 18-Dec-25 14:00 ALTALINK, TRANSALTA Outage 250p T2 (250p Bighorn Plant) maintenance 4 Hours
Daily		  
18-Dec-25 11:00 18-Dec-25 16:00 ENMAX Outage 2B138-D96 (SS-2) breaker trip coil test - 2B138-D96 5 Hours
Continuous		  
18-Dec-25 11:00 22-Dec-25 13:00 ALTALINK Outage 347s 199W (347s AML Fox Creek), 199L (347s AML Fox Creek - 741s ATC Fox Creek) Gas top up on 347s199W 4.08 Days
Daily		  
19-Dec-25 08:00 21-Dec-25 16:00 ATCO RB 7L45 (798s Bridge Creek - 813s Little Smoky) high load move 7L45 str 158 2.33 Days
Continuous		  
19-Dec-25 08:00 21-Dec-25 16:00 ATCO RB 7L46 (813s Little Smoky - 845s Big Mountain) high load move 7L46 str 158 2.33 Days
Continuous		  
19-Dec-25 08:00 20-Dec-25 16:00 ENMAX Outage 2.82L (SS-2 - SS-5) Investigate sagging cables in MH2299. Xray and jacket test. 1.33 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. Line will terminate at new 1 sub upon return to service. 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. Line will terminate at new 1 sub upon return to service. 62.29 Days
Continuous		  
05-Jan-26 08:00 08-Jan-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole and cross arm replacement from T&T 3.33 Days
Continuous		  
05-Jan-26 08:00 06-Jan-26 16:00 ALTALINK TE AML 793s RTU/SCADA (AML 793s Horse Creek) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
05-Jan-26 08:00 09-Jan-26 17:00 ALTALINK TE 356s Protection & Control (356s Milo) DLR project - protection outages required to make metering configuration changes 4.38 Days
Daily		  
05-Jan-26 08:00 09-Jan-26 17:00 ALTALINK TE 356s RTU/SCADA (356s Milo) DLR project - update RTU for RAS175 protection changes 4.38 Days
Daily		  
05-Jan-26 10:00 12-Jan-26 12:00 ATCO Outage 9L40 (732s Mitsue - 809s Louise Creek) replace 4 damaged poles 7.08 Days
Continuous		  
05-Jan-26 11:00 09-Jan-26 17:30 ATCO TE 735s Protection & Control (735s Swan River) relay testing on 50BF/601, 87TA/601T, 87B/600BS3, 21B/6L97, 21B/6L96, 50BF/602, 50BF/604, 50BF/603 4.27 Days
Continuous		  
06-Jan-26 07:15 11-Jan-26 18:30 ALTALINK Outage 890L (58s Edson - 207s Pinedale) Replace structures 95, 96, 102, 103, 109, 113, 114, 116, 117 and 118. 5.47 Days
Continuous		  
06-Jan-26 08:00 09-Jan-26 17:00 ATCO Outage 732s 902T (732s Mitsue), 732s 503R (732s Mitsue) Protection upgrade. Remove old protection, cut over to new protection and cut over equipment status, control and alarms to new station controller. 3.38 Days
Continuous		  
06-Jan-26 08:00 08-Jan-26 17:00 ALTALINK TE 38s Protection & Control (38s East Edmonton) standard relay maintenance 2.38 Days
Daily		  
06-Jan-26 08:00 08-Jan-26 17:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) standard relay maintenance 2.38 Days
Daily		  
06-Jan-26 08:00 06-Jan-26 17:00 ALTALINK TE 316s Protection & Control (316s West Crossfield) standard relay maintenance 9 Hours
Daily		  
06-Jan-26 08:00 07-Jan-26 16:00 ALTALINK TE 5s RTU/SCADA (5s East Calgary) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
06-Jan-26 08:00 06-Jan-26 17:00 ALTALINK TE 99s RTU/SCADA (99s North St. Albert), AltaLink Telecom Equipment replace firewall, split VLAN 9 Hours
Daily		  
06-Jan-26 08:30 07-Jan-26 17:00 ALTALINK TE 378s Protection & Control (378s Shell Caroline) Removing 138kV relays one at a time for maintenance. All protections impacted are non-redundant. 1.35 Days
Daily		  
06-Jan-26 08:30 08-Jan-26 17:00 ALTALINK TE 15s Protection & Control (15s Fort Macleod) relay maintenance 2.35 Days
Daily		  
06-Jan-26 09:00 06-Jan-26 11:00 ATCO TE ATCO Telecom Equipment, 801s RTU/SCADA (801s Anderson), 807s RTU/SCADA (807s Sheerness) Upgrading SAR from v9, to v21, then 22
IMPACT TO THE FOLLOWING TRAFFIC FOR UP TO 1 HOUR:
Anderson Sub SCADA
Anderson Sub PMU SCADA
Anderson Sub GFO SCADA
Thermal Prot RAS A
9L99 A
9L950 A
9L934 A
9L933 A
9L59 / 87L A
7L85 A&B
7LA85 A&B
#200 RAS A
50BF / 705		 2 Hours
Continuous		  
07-Jan-26 07:00 13-Jan-26 17:30 ALTALINK RB 799L (235s Entwistle - 443s South Mayerthorpe), 799L (77s Sagitawah - 443s South Mayerthorpe) proximity for 799L rebuild str 888A–909 (section D) 6.44 Days
Daily		  
07-Jan-26 07:30 07-Jan-26 15:00 ALTALINK TE 17s Protection & Control (17s Benalto) commission fail alarms from new 297s3302L, possible setting changes required 7.5 Hours
Daily		  
07-Jan-26 08:00 07-Jan-26 17:00 ATCO Outage 7L92 (709s Vegreville - 7LA92 tap), 709s 705 (709s Vegreville) replace structure 7L92-37 9 Hours
Continuous		  
07-Jan-26 08:00 07-Jan-26 18:00 Syncrude TE Syncrude ICCP Outage server update
 10 Hours
Daily		  
07-Jan-26 08:00 20-Jan-26 18:00 ALTALINK Outage 931L (28s West Brooks - 132s Ware Junction) install steel self-supporting structure as part of the 1075L storm restoration 13.42 Days
Continuous		  
07-Jan-26 08:00 08-Jan-26 16:00 ENMAX, ALTALINK Outage 35.81L (42s Sarcee - SS-35), 35B138-81 (SS-35), 42s 35 (42s Sarcee), 35MD138-81 (SS-35), 35MD138-83 (SS-35), 35MD138-35.81 (SS-35) maintenance - 35MD138-35.81, 35MD138-83, 35MD138-81, SW81 1.33 Days
Continuous		  
07-Jan-26 08:00 08-Jan-26 16:00 ALTALINK TE 65s RTU/SCADA (65s High River) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
07-Jan-26 08:00 08-Jan-26 16:00 ALTALINK IO 42s 35 (42s Sarcee) maintenance - 35MD138-35.81, 35MD138-83, 35MD138-81, SW81 1.33 Days
Daily		  
07-Jan-26 08:00 07-Jan-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 305s RTU/SCADA (305s Acheson) update MPLS nodes, split VLAN and update configuration 9 Hours
Daily		  
07-Jan-26 09:00 07-Jan-26 11:00 ATCO TE ATCO Telecom Equipment upgrading the Anderson NET 11 sar from v9 to v21, then v22 2 Hours
Continuous		  
08-Jan-26 08:00 08-Jan-26 17:00 ALTALINK TE 504s RTU/SCADA (504s Queenstown) RTU outrage to replace Ronan annunciator 9 Hours
Daily		  
08-Jan-26 08:00 19-Jan-26 16:00 Syncrude Outage 814 (Syncrude Mildred Lake), 815 (Syncrude Mildred Lake), 816 (Syncrude Mildred Lake) SCL - Repair 72kV Pothead in Plant 31 Switchyard 11.33 Days
Continuous		  
08-Jan-26 08:00 08-Jan-26 17:00 ALTALINK TE 42s Protection & Control (42s Sarcee) PRC maintenance on T1 S59-T1/TERT, C3 B50/51N/27/59/60/60N/C3 , C2 B50/51N/27/59/60/60N/C2 9 Hours
Daily		  
08-Jan-26 08:00 09-Jan-26 16:00 ALTALINK TE 245s RTU/SCADA (245s Seebe) split the existing SCADA VLAN from 1 to 1 and 2 1.33 Days
Daily		  
08-Jan-26 08:00 08-Jan-26 16:00 ENMAX Outage 5.1TR (SS-5) relay protection test, lockouts, tap changer reversing switch check 8 Hours
Continuous		  
08-Jan-26 08:00 08-Jan-26 16:00 ALTALINK TE 434s RTU/SCADA (434s Stony Plain) split VLAN, replace firewall 8 Hours
Daily		  
08-Jan-26 08:30 08-Jan-26 12:00 ALTALINK TE 412s Protection & Control (412s Shell Eagle Creek) remove under frequency relays for maintenance 3.5 Hours
Daily		  
08-Jan-26 09:00 08-Jan-26 11:00 ATCO TE ATCO Telecom Equipment, 930s RTU/SCADA (930s Arcenciel) UPGRADING SAR OS TO V21, THEN TO V22
IMPACT TO THE FOLLOWING TRAFFIC FOR UP TO 1 HOUR:
VPLS 10 - ARCENCIEL SCADA
TPRNN128 / 7L64 A&B - ARCENCIEL / KEG RIVER
TPRNN094 / 7L93 A &B- ARCENCIEL / SULPHUR POINT		 2 Hours
Continuous		  
08-Jan-26 09:00 09-Jan-26 17:00 ATCO TE ATCO Telecom Equipment, 718s Protection & Control (718s Parsons Creek) telecom upgrade 1.33 Days
Continuous		  
08-Jan-26 09:00 08-Jan-26 09:30 ALTALINK Outage 719L (263s Strachan - 719AL tap), 719L (719AL tap - 719BL tap), 304s T1 (304s Shell Limestone), 304s T2 (304s Shell Limestone), 581s T1 (581s Amoco Ricinus), 719AL (581s Amoco Ricinus - 719L tap), 764L (304s Shell Limestone - 581s Amoco Ricinus) Outage required for switching to open 719L259C. 30 Mins
Continuous		  
08-Jan-26 09:30 25-Jan-26 18:00 ALTALINK Outage 719L (263s Strachan - 719AL tap) Component replacement/maintenance Str 260-287. 17.35 Days
Continuous		  
08-Jan-26 10:00 08-Jan-26 15:00 ATCO Outage 7L53 (700s Bonnyville - 7LA53 tap), 700s 702 (700s Bonnyville) 7L53 outage required to complete work on 7L53-620 5 Hours
Continuous		  
08-Jan-26 12:30 08-Jan-26 17:00 ALTALINK TE 531s Protection & Control (531s Shell Schrader Creek) remove under frequency relays for maintenance 4.5 Hours
Daily		  
09-Jan-26 08:00 09-Jan-26 16:00 ENMAX Outage 5.6TR (SS-5) relay protection test lockouts, tap changer reversing switch check 8 Hours
Continuous		  

Prepared On:   2025-12-10   15:24:58

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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