Alberta Electric System Operator
System Co-ordination Plan
2025-11-15 to 2025-11-21
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 31-Dec-25 16:00 ALTALINK Outage 377s 473C (377s AML Hardisty) forced outage 295.71 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		  
08-Jun-25 15:00 25-Nov-25 15:30 ALTALINK Outage 397s 864W (397s Benbow) new 864L line construction, new 397s48 (VT6) install 170.06 Days
Continuous		  
13-Jun-25 17:00 11-Feb-26 17:00 EPCOR Outage T3 (Rossdale) Rossdale - TX3 LCR 243.04 Days
Continuous		  
16-Jul-25 07:00 01-Dec-25 23:55 NWE Outage 2366 (NWE Marias) install new equipment at Marias 138.75 Days
Continuous		 AB-MATL
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 31-Dec-25 16:30 ALTALINK Outage 263s C1 (263s Strachan) forced outage 162.38 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		  
02-Aug-25 23:30 10-Dec-25 18:00 ATCO Outage 827s SVC (827s Cranberry Lake) forced outage 129.81 Days
Continuous		  
18-Aug-25 07:00 21-Nov-25 17:00 EPCOR TE 805s Protection & Control (805s Jasper) protection blocking for P&C maintenance 95.46 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 10-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 107.38 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		  
05-Sep-25 08:00 24-Nov-25 16:00 ENMAX Outage 1.83L (SS-1 - SS-8) 1 sub Transmission line cut over. Line will terminate at new 1 sub upon return to service. 80.38 Days
Continuous		  
05-Sep-25 08:00 24-Nov-25 16:00 ENMAX Outage 1.85L (SS-1 - SS-8) 1 sub transmission line cut over. line will terminate at new 1 sub upon return to service. 80.38 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		  
26-Sep-25 07:00 23-Nov-25 11:00 ALTALINK Outage 864L (397s Benbow - 864AL tap), 397s 864W (397s Benbow) 864CL line construction 58.21 Days
Continuous		  
06-Oct-25 10:00 19-Nov-25 16:00 ALTALINK Outage 102s SVC (102s Langdon), 102s T4 (102s Langdon), 102s 252 (102s Langdon), 102s 552 (102s Langdon) the controls change 44.29 Days
Continuous		 AB-BC
15-Oct-25 12:00 01-Dec-25 17:00 EPCOR Outage 330P 12TC1 (330p Genesee), 330p 805 (330p Genesee) Genesee: 12TC1 emergency bushing investigation 47.25 Days
Continuous		  
16-Oct-25 08:00 24-Nov-25 20:00 SUNCOR Outage 29EDD-61 29PT-653 (29EDD-61 Stony Island), 29EDD-61 30-252-500001 (29EDD-61 Stony Island) 29PT-653 repair / replace burned bonding conductor (9000808061) 39.54 Days
Continuous		  
20-Oct-25 07:00 28-Nov-25 17:00 ALTALINK, EPCOR RB 1044L (EP 805s Jasper - 816s Petrolia) working in proximity (MN872 manhole replacement) 39.46 Days
Continuous		  
27-Oct-25 08:00 20-Nov-25 16:00 ENMAX Outage 32.83L (SS-32 - SS-40), 32B138-32.83 (SS-32), 40B138-32.83 (SS-40) 32.83L P&C cut over 24.38 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 21-Nov-25 17:00 EPCOR TE EP 511s Protection & Control (EP 511s Victoria) protection block on “A” protections for VN21 at Victoria 18.42 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		  
04-Nov-25 09:00 24-Nov-25 13:00 ATCO TE 741s RTU/SCADA (741s Fox Creek) SCADA SMP being updated with new points for 7L90 RAS addition 20.17 Days
Continuous		  
04-Nov-25 10:30 10-Dec-25 15:00 ATCO TE 710s Protection & Control (710s Vermilion) 86-50BF-1/700BS1 secondary protection block common lockout so we can tie in new BF trips from 7L117 A&B, 7L129 A&B, 7L130 A&B 36.19 Days
Continuous		  
04-Nov-25 10:30 10-Dec-25 15:00 ATCO TE 710s Protection & Control (710s Vermilion) 87BA/700BS1, secondary protection, blocked for 7L129 primary injection as well as 7L117 primary injection as well as local SCADA cutover testing 36.19 Days
Continuous		  
06-Nov-25 13:00 18-Nov-25 17:00 BCH Outage 2L113 (BCH Cranbrook - BCH Natal), T3 (BCH Natal), T4 (BCH Natal), 12CB23 (BCH Natal) NTL substation replacement + ETM install 12.17 Days
Continuous		 AB-BC
07-Nov-25 08:00 18-Nov-25 16:00 ATCO Outage 7L117 (706s Irish Creek - 710s Vermilion), 710s 701 (710s Vermilion), 706s 703 (706s Irish Creek) 7L117 - A and B line protection upgrade 11.33 Days
Continuous		  
07-Nov-25 08:00 18-Nov-25 15:30 ATCO TE 710s Protection & Control (710s Vermilion) protection upgrade 11.31 Days
Continuous		  
07-Nov-25 10:30 18-Nov-25 15:00 ATCO TE 710s Protection & Control (710s Vermilion) blocking A and B of each relay for 7L117 secondary injection 11.19 Days
Continuous		  
08-Nov-25 08:00 16-Nov-25 15:00 ENMAX, ALTALINK Outage 28.80L (42s Sarcee - SS-28), 28.2TR (SS-28), 28B138-28.80 (SS-28), 42s 28 (42s Sarcee), 28MD138-28.2TR (SS-28), SW82 (SS-28) 28.2TR protection upgrade and SW80 replacement 8.29 Days
Continuous		  
08-Nov-25 08:00 16-Nov-25 15:00 ENMAX TE Protection & Control (SS-28) 28.2TR protection upgrade 8.29 Days
Daily		  
08-Nov-25 08:00 16-Nov-25 15:00 ENMAX TE Protection & Control (SS-28) 28 sub auto switching protection scheme outage 8.29 Days
Daily		  
08-Nov-25 08:00 16-Nov-25 15:00 ENMAX, ALTALINK IO 28.80L (42s Sarcee - SS-28) 28.2TR protection upgrade and SW80 replacement 8.29 Days
Continuous		  
09-Nov-25 09:00 15-Nov-25 14:00 ENMAX Outage 41.84L (SS-41 - SS-54), 41B138-41.84 (SS-41), 54B138-41.84 (SS-54) install three new line surge arrestors at Sub 41 and replace SW86 at Sub 41 6.21 Days
Continuous		  
10-Nov-25 07:00 15-Nov-25 17:00 EPCOR Outage M724 (Meadowlark) meadowlark: m724 breaker maintenance (min oil) 5.42 Days
Continuous		  
10-Nov-25 07:00 19-Nov-25 17:00 EPCOR Outage T3 (Rossdale), R723 (Rossdale), R724 (Rossdale), RAB3 (Rossdale) rossdale: tx3 zone for scaffold/hoarding install 9.42 Days
Continuous		  
10-Nov-25 07:00 17-Nov-25 17:00 EPCOR TE APS# 172 Garneau - Meadowlark Reconfiguration Scheme blocking A RAS for MPLS upgrade 7.42 Days
Continuous		  
11-Nov-25 07:00 16-Nov-25 18:00 ATCO, ALTALINK Outage 923L (356s Milo - 2075s Newell) performing maintenance between structures #74 - 162 5.46 Days
Continuous		  
11-Nov-25 07:30 16-Nov-25 17:30 ALTALINK RB 935L (324s Cassils - 356s Milo) crews working within close proximity on 923L 5.42 Days
Daily		  
12-Nov-25 07:30 21-Nov-25 17:30 ATCO, ALTALINK RB 1036L (356s Milo - 554s Travers) crews will be within close proximity on 1005L (STR 3-75) 9.42 Days
Daily		  
12-Nov-25 08:00 19-Nov-25 20:00 SUNCOR TE 29PL6-22 (29EDD-1 Millennium - 29EDD-2 Tar Island) 29PL6-22 A87L GE L90 firmware upgrade - 300477551 7.5 Days
Continuous		  
12-Nov-25 08:00 18-Nov-25 18:00 ALTALINK Trans Test 102s SVC (102s Langdon) live commissioning 6.42 Days
Daily		  
12-Nov-25 08:00 17-Nov-25 16:00 ENMAX Outage 20.1TR (SS-20) maintenance 5.33 Days
Continuous		  
12-Nov-25 14:00 15-Nov-25 16:00 ATCO Outage 7L85 (803s ATC Bullpound - 7LA85 tap) install conductor weights 7L85 between structures 401 to 457 3.08 Days
Continuous		  
13-Nov-25 18:00 24-Nov-25 12:00 ALTALINK Outage 1005L (356s Milo - 1005AL tap) repairing the inner between STR 3-75 on 1005L 10.75 Days
Continuous		  
14-Nov-25 07:00 19-Nov-25 18:00 ALTALINK Outage 612L (336s Fincastle - 368s Burdett), 336s 612 (336s Fincastle), 368s 612 (368s Burdett) reroute Str 153-157 for road widening 5.46 Days
Continuous		  
14-Nov-25 07:00 03-Dec-25 18:00 ALTALINK RB 931L (28s West Brooks - 132s Ware Junction) required for 1053L GOI due to proximity 19.46 Days
Daily		  
14-Nov-25 07:00 24-Nov-25 17:30 ALTALINK RB 759L (87s Gaetz - 276s Prentiss) prep structure 27-30 for the upcoming GOI and setting structures on 986L/962L near 10-21 10.44 Days
Daily		  
14-Nov-25 08:00 15-Nov-25 17:00 ATCO RB 6L96 (735s Swan River - 743s Sarah Lake) add a D'back to distribution under strung 1.38 Days
Daily		  
14-Nov-25 09:30 03-Dec-25 18:00 ALTALINK Outage 1053L (132s Ware Junction - 324s Cassils) install ~6.8 km of new conductor for new 1075L on open side of tower opposite to 1053L on structures 19.35 Days
Continuous		  
14-Nov-25 16:00 23-Nov-25 11:00 ALTALINK IO 714L (397s Benbow – 1117s South Kaybob) complete work inside of 714L breaker bay 8.79 Days
Continuous		  
15-Nov-25 07:00 15-Nov-25 17:00 EPCOR TE RTU/SCADA (Rossdale) substation firewall replacement 10 Hours
Continuous		  
15-Nov-25 07:00 17-Nov-25 18:00 ENMAX Outage 1.83L (SS-1 - SS-8), 8B138-3A0 (SS-8), 8B138-4A0 (SS-8) 1 sub transmission line cut over 2.46 Days
Continuous		  
15-Nov-25 08:00 16-Nov-25 14:00 ENMAX Outage 162B240-RB131 (SS-162), 162B240-RB132 (SS-162), 1-GSU-XF-0001 (SS-162) HV SW Maint. 162SW133, 162SW132. 30 Hours
Continuous		  
16-Nov-25 08:00 16-Nov-25 16:00 ATCO Outage 7L85 (804s Wintering Hills - 7LA85 tap), 804s 702 (804s Wintering Hills) pole change for L-G clearance mitigation, install conductor weights 7L85 between structures 401 to 457 8 Hours
Continuous		  
16-Nov-25 08:00 17-Nov-25 17:00 ATCO RB 6L96 (735s Swan River - 743s Sarah Lake) salvage GS S31636 A#568876 close to 6L96-133 using live line techniques 1.38 Days
Daily		  
17-Nov-25 07:00 25-Nov-25 17:00 EPCOR TE Protection & Control (Namao) protection blocking for NW15 line protection upgrade 8.42 Days
Continuous		  
17-Nov-25 07:00 23-Nov-25 17:00 EPCOR Outage 814s T2 (814s Bellamy), 814s B2402 (814s Bellamy), 814s B2406 (814s Bellamy), BR722 (Rossdale) TX2 bushing replacement and 240kv SF6 gas tests and leak checks 6.42 Days
Continuous		  
17-Nov-25 07:00 21-Nov-25 08:00 ALTALINK Outage 409s T2 (409s Shell Scotford) replace T2 NGR 4.04 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		  
17-Nov-25 07:00 21-Nov-25 17:00 EPCOR TE 72DS26 (665s Dome - Strathcona) protection blocking for 72DS26 line protection A upgrade 4.42 Days
Continuous		  
17-Nov-25 07:30 24-Nov-25 16:30 ALTALINK RB 913L (69s North Barrhead - 732s Mitsue) walk up and climbing inspection 7.38 Days
Continuous		  
17-Nov-25 07:30 17-Nov-25 15:30 ALTALINK RB 825L (77s Sagitawah - 484s Millar Western) insulator washing on 825L 8 Hours
Daily		  
17-Nov-25 08:00 18-Nov-25 14:00 ENMAX Outage 162B240-RB135 (SS-162), 162B240-RB134 (SS-162), 2-GSU-XF-0002 (SS-162) HV switch maintenance 162SW143, 162SW142 30 Hours
Continuous		  
17-Nov-25 08:00 20-Nov-25 17:00 ATCO IO ATCO Telecom Equipment Lanfine_S-Telecom upgrade 3.38 Days
Continuous		  
17-Nov-25 08:00 17-Nov-25 17:00 SUNCOR TE SUNCOR DNP Outage updating AESO Gateway and DCS gateway RTU's as per CIP requirements for live data 9 Hours
Continuous		  
17-Nov-25 08:00 17-Nov-25 18:00 ENMAX Outage 24.82L (SS-24 - SS-65), 24.2TR (SS-24), 24B138-24.82 (SS-24), 65B138-D81 (SS-65), 65B138-D82 (SS-65), 24B138-24BT3 (SS-24) investigate 24.82L, check reversing switch 24.2TR, surge arrestor power factor test - 65MD138-24.82, 24B138-24.82 breaker racking support install 10 Hours
Continuous		  
17-Nov-25 08:00 24-Nov-25 16:00 ATCO RB 7L61 (780s Lubicon - 796s Nipisi) walk up and climbing inspection 7.33 Days
Continuous		  
17-Nov-25 08:00 24-Nov-25 16:00 ATCO RB 9L913 (69s North Barrhead - 732s Mitsue) walk up and climbing inspection 7.33 Days
Continuous		  
17-Nov-25 08:00 18-Nov-25 16:00 ENMAX TE Protection & Control (SS-11) 11sub 138kV bus differential protection outage, CT terminal replacement 1.33 Days
Daily		  
17-Nov-25 08:00 27-Nov-25 17:00 ALTALINK TE 397s RTU/SCADA (397s Benbow) update configuration for L2 protection upgrade, AIS 1159 additions, and 43M addition 10.38 Days
Daily		  
17-Nov-25 08:00 21-Nov-25 17:00 ALTALINK TE 312s RTU/SCADA (312s Fidler) split breaker alarms 4.38 Days
Daily		  
17-Nov-25 08:00 18-Nov-25 16:00 Syncrude Outage C1 (Aurora) complete cap bank maintenance in G01 substation 1.33 Days
Continuous		  
17-Nov-25 08:00 17-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 131s RTU/SCADA (131s Moon Lake), 283s RTU/SCADA (283s Violet Grove), 235s RTU/SCADA (235s Entwistle) 131s - 9516R radio maintenance 9 Hours
Daily		  
17-Nov-25 08:00 17-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 498s RTU/SCADA (498s Tilley) MPLS firmware upgrade 9 Hours
Daily		  
17-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 262s RTU/SCADA (262s Rocky Mountain House) MPLS firmware upgrade 3.38 Days
Daily		  
17-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE 250p RTU/SCADA (250P Bighorn Plant), AltaLink Telecom Equipment MPLS firmware upgrade 3.38 Days
Daily		  
17-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE 482s RTU/SCADA (482s Haynes), AltaLink Telecom Equipment MPLS firmware upgrade 3.38 Days
Daily		  
17-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE 297s RTU/SCADA (297s Rimbey), AltaLink Telecom Equipment MPLS firmware upgrade 3.38 Days
Daily		  
17-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE 581s RTU/SCADA (581s Amoco Ricinus), AltaLink Telecom Equipment MPLS firmware upgrade 3.38 Days
Daily		  
17-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 142s RTU/SCADA (142s Magcan) MPLS firmware upgrade 3.38 Days
Daily		  
17-Nov-25 08:00 17-Nov-25 12:00 ENMAX TE RTU/SCADA (SS-47) 47 sub SDN project 4 Hours
Continuous		  
17-Nov-25 08:30 20-Nov-25 16:30 ALTALINK IO 913L (69s North Barrhead - 732s Mitsue) protection upgrade 3.33 Days
Continuous		  
17-Nov-25 08:30 20-Nov-25 17:00 ALTALINK TE 409s Protection & Control (409s Shell Scotford) protection outages for SCADA upgrades 3.35 Days
Daily		  
17-Nov-25 08:30 20-Nov-25 17:00 ALTALINK TE 409s RTU/SCADA (409s Shell Scotford) update config for new functionality on existing RTU 3.35 Days
Daily		  
17-Nov-25 09:00 27-Nov-25 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe), 235s 799N (235s Entwistle) 799L rebuild (Str 830-858) 10.38 Days
Continuous		  
17-Nov-25 09:00 20-Nov-25 16:00 ATCO, ALTALINK Outage 9L913 (69s North Barrhead - 732s Mitsue), 732s 903 (732s Mitsue), 732s 904 (732s Mitsue), 69s 913N (69s North Barrhead) protection upgrade 3.29 Days
Continuous		  
17-Nov-25 09:00 28-Nov-25 17:30 ALTALINK TE 177s RTU/SCADA (177s West Cascade) SCADA cutover 11.35 Days
Daily		  
17-Nov-25 09:00 18-Nov-25 17:00 BCH Outage T3 (BCH Natal), 2CB1 (BCH Natal) NTL 2CB1 BFPN 1.33 Days
Continuous		 AB-BC
17-Nov-25 10:00 26-Nov-25 16:00 ATCO Outage 7L106 (834s Wesley Creek - 905s Meikle) soil around the tower footings has eroded ( tower replacement ) 9.25 Days
Continuous		  
17-Nov-25 10:00 26-Nov-25 16:00 ATCO Outage 7L131 (834s Wesley Creek - 905s Meikle), 834s 708 (834s Wesley Creek), 834s 710 (834s Wesley Creek), 834s 7L131D2 (834s Wesley Creek) soil around the tower footings has eroded ( Tower Replacement ) 9.25 Days
Continuous		  
17-Nov-25 10:00 24-Nov-25 16:00 ATCO Outage 7L90 (741s ATC Fox Creek - 7LA90 tap), 741s 701 (741s ATC Fox Creek) RAS installation and commissioning 7.25 Days
Continuous		  
17-Nov-25 10:00 18-Nov-25 17:00 ALTALINK TE 320p Protection & Control (320P Keephills) standard relay maintenance 31 Hours
Daily		  
17-Nov-25 10:00 25-Nov-25 17:00 ALTALINK TE 397s Protection & Control (397s Benbow) settings changes & testing 8.29 Days
Daily		  
17-Nov-25 10:00 20-Nov-25 17:00 ATCO RB 7L86 (822s Wolf Lake - 1200s Foster Creek) L-G clearance mitigation pole changes 3.29 Days
Continuous		  
17-Nov-25 11:30 21-Nov-25 10:30 ALTALINK Outage 184s 34 (184s Petro-Canada Edmonton) replace koncar CTs associated with 184s34 3.96 Days
Continuous		  
17-Nov-25 11:30 20-Nov-25 17:00 ALTALINK TE 42s Protection & Control (42s Sarcee) protections required to isolate CTs associated with 42s7 3.23 Days
Daily		  
17-Nov-25 11:30 18-Nov-25 16:30 ALTALINK Outage 225s T1 (225s Magrath), 863L (225s Magrath - 891L tap), 225s 4 (225s Magrath), 225s 863 (225s Magrath) urgent replacement of the qualitrol device for T1 29 Hours
Continuous		  
17-Nov-25 12:00 28-Nov-25 18:30 ALTALINK Outage 29s T2 (29s Cascade) SCADA cutovers from T29s RTU to 177s RTU 11.27 Days
Continuous		  
17-Nov-25 12:00 24-Nov-25 17:00 ATCO TE 951s RTU/SCADA (951s Thickwood Hills) firmware upgrades of line protection relays and breaker fail relays for that week
RTU Config changes may be required		 7.21 Days
Continuous		  
17-Nov-25 12:30 27-Nov-25 17:30 ALTALINK TE 62s RTU/SCADA (62s Brazeau Plant) RTU database updates 10.21 Days
Daily		  
17-Nov-25 13:00 28-Nov-25 17:30 ALTALINK TE 562s RTU/SCADA (562s Cypress) ACC Visbility project 11.19 Days
Daily		  
17-Nov-25 13:00 17-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 498s RTU/SCADA (498s Tilley) non-intrusive radio maintenance 4 Hours
Daily		  
17-Nov-25 14:00 20-Nov-25 17:00 ENMAX, ALTALINK Outage 7.82L (42s Sarcee - SS-7), 42s 7 (42s Sarcee) 42s7 CT replacement 3.13 Days
Continuous		  
17-Nov-25 14:00 20-Nov-25 17:00 ENMAX, ALTALINK RB 7.82L (42s Sarcee - SS-7) 42s7 CT replacement 3.13 Days
Continuous		  
18-Nov-25 07:00 19-Nov-25 17:00 ATCO TE 951s Protection & Control (951s Thickwood Hills) CSP needed for 900SST1 B relay for firmware upgrade and local testing 1.42 Days
Continuous		  
18-Nov-25 07:00 24-Nov-25 17:00 ATCO TE 951s Protection & Control (951s Thickwood Hills) breaker fail relays for firmware upgrade and local testing, 50bf/911
2. 50bf/910
3. 9L07-906		 6.42 Days
Continuous		  
18-Nov-25 08:00 20-Nov-25 16:00 ENMAX Outage 16.61L (SS-16 - SS-27), 27B69-16.61 (SS-27), 16B69-16.61 (SS-16) 27 sub security upgrade - security post proximity to line 2.33 Days
Continuous		  
18-Nov-25 08:00 18-Nov-25 17:30 ALTALINK TE APS# 33 Cypress (T562s) Reverse Power and Undervoltage Scheme, 562s Protection & Control (562s Cypress) acc visbility project, adding supervisory controls to RAS33 scheme 9.5 Hours
Daily		  
18-Nov-25 08:00 18-Nov-25 15:00 ALTALINK Outage 312s 852 (312s Fidler) splitting alarm contact and wiring each alarm point from breaker control cabinet to d25 in control building 7 Hours
Daily		  
18-Nov-25 08:00 18-Nov-25 17:00 ATCO TE 732s Protection & Control (732s Mitsue) Block 87BA/900BS1 to change alarm logic 9 Hours
Continuous		  
18-Nov-25 08:00 19-Nov-25 17:00 ALTALINK TE 294s RTU/SCADA (294s Brazeau Outletworks), AltaLink Telecom Equipment upgrade MPLS node 1.38 Days
Daily		  
18-Nov-25 08:00 19-Nov-25 17:00 ALTALINK TE 207s RTU/SCADA (207s Pinedale) RTU database updates 1.38 Days
Daily		  
18-Nov-25 08:00 18-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 562s RTU/SCADA (562s Cypress) MPLS firmware upgrade 9 Hours
Daily		  
18-Nov-25 08:30 18-Nov-25 12:30 ALTALINK, BPWF Outage 1097L (356s Milo – 611s Amber), 356s 1097 (356s Milo), 611s T1 (611s Amber), 611s T2 (611s Amber), 611s 52-240-1 (611s Amber), 611s 52-240-2 (611s Amber), 611s 89-B1 (611s Amber), 611s 89-T1 (611s Amber), 611s 89-T2 (611s Amber) urgent outage for arctic arrow to make a damper repair for the customer on 1097L 4 Hours
Continuous		  
18-Nov-25 09:00 19-Nov-25 17:30 ALTALINK TE 177s Protection & Control (177s West Cascade), 29s Protection & Control (29s Cascade) cutover of 54L and T2 protection alarms to new 177s RTU from T29s RTU 1.35 Days
Daily		  
18-Nov-25 09:00 20-Nov-25 17:00 ATCO TE ATCO Telecom Equipment, 2075s RTU/SCADA (2075s Newell) med bes firewall install - outage to local network & scada communications 2.33 Days
Continuous		  
18-Nov-25 09:00 18-Nov-25 18:00 ATCO TE ATCO Telecom Equipment, 779s RTU/SCADA (779s Chinchaga River) chinchaga river_s-telecom- removing old vsat equipment, installing new firewall/checkpoint 9 Hours
Continuous		  
18-Nov-25 13:00 28-Nov-25 17:00 BCH Outage T4 (BCH Natal) natal substation replacement and etm install 10.17 Days
Continuous		 AB-BC
19-Nov-25 07:00 19-Nov-25 17:00 ATCO Outage 7L749 (716s Lloydminster - 7LB749 tap), 716s 701 (716s Lloydminster) 7L749 line raise span 57 10 Hours
Continuous		  
19-Nov-25 07:00 20-Nov-25 17:00 ATCO TE 951s Protection & Control (951s Thickwood Hills) firmware upgrades on 94BA/900-1200BS1 (SEL-2440) and 94BA/900-1200BS1 (SEL-2440), including post upgrade commissioning 1.42 Days
Continuous		  
19-Nov-25 07:00 20-Nov-25 18:00 ALTALINK TE AltaLink Telecom Equipment addition of secondary MPLS node - MPLS 7705B, to provide diversity to the existing circuits 1.46 Days
Continuous		  
19-Nov-25 07:00 23-Nov-25 10:49 ATCO RB 7L16 (766s Nevis - 948s Heatburg) facilitate work adjacent to line for CETO project 4.16 Days
Continuous		  
19-Nov-25 07:00 19-Nov-25 09:00 ALTALINK TE 83s Protection & Control (83s Taber) 83s172L remote settings change 2 Hours
Daily		  
19-Nov-25 07:00 19-Nov-25 09:00 ALTALINK TE 254s Protection & Control (254s Coaldale) 254s172L remote settings change 2 Hours
Daily		  
19-Nov-25 08:00 19-Nov-25 17:00 ATCO, ENEL TE ATCO Telecom Equipment, 708s RTU/SCADA (708s Grizzly Bear) low BES firewall install - outage to Local Network & SCADA Communications
 9 Hours
Continuous		  
19-Nov-25 08:00 19-Nov-25 17:30 ATCO, ALTALINK TE APS# 27 562S Cypress McNeil Power and Undervoltage Scheme, 562s Protection & Control (562s Cypress) ACC visibility project 9.5 Hours
Daily		  
19-Nov-25 08:00 21-Nov-25 20:00 SUNCOR TE 29PL6-3 (29EDD-1 Millennium - 30EDD-1), 30EDD-1 627 (30EDD-1) 29PL6-3 A87L GE L90 firmware 8.6 - 300477554 2.5 Days
Continuous		  
19-Nov-25 08:00 19-Nov-25 15:00 ALTALINK Outage 312s 952 (312s Fidler) splitting alarm contact and wiring each alarm point from breaker control cabinet to D25 in control building 7 Hours
Daily		  
19-Nov-25 08:00 19-Nov-25 17:00 ATCO TE 741s Protection & Control (741s Fox Creek) new 7L90 RAS relays need to be connected to existing 700PT1 9 Hours
Continuous		  
19-Nov-25 08:00 19-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 477s RTU/SCADA (477s Amoco West Pembina), 489s RTU/SCADA (489s Petro Canada Brazeau River) upgrade MPLS node 9 Hours
Daily		  
19-Nov-25 08:00 19-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 378s RTU/SCADA (378s Shell Caroline) 2025 MPLS firmware upgrade 9 Hours
Daily		  
19-Nov-25 09:00 20-Nov-25 16:00 ATCO TE 939s Protection & Control (939s Livock) relay work
 31 Hours
Continuous		  
19-Nov-25 09:00 20-Nov-25 20:00 SUNCOR TE 29EDD-2 29PT-3 (29EDD-2 Tar Island), 29EDD-2 Protection & Control (29EDD-2 Tar Island) 29EDD-2, 29PT-3 94T-A - replacement 1.46 Days
Continuous		  
19-Nov-25 10:00 20-Nov-25 17:00 ALTALINK TE 353s Protection & Control (353s Plamondon) standard relay maintenance 31 Hours
Daily		  
19-Nov-25 10:00 21-Nov-25 17:30 ATCO TE 834s Protection & Control (834s Wesley Creek), 834s RTU/SCADA (834s Wesley Creek) 834S 7L131 21A protection communication card replacement
 2.31 Days
Continuous		  
20-Nov-25 07:00 20-Nov-25 17:00 ATCO Outage 7L42 (716s Lloydminster - 751s Hill), 751s 702 (751s Hill) structure alterations to accommodate new development 75th Ave and 19th Street in the City of Lloydminster 10 Hours
Continuous		  
20-Nov-25 07:00 20-Nov-25 16:30 ALTALINK Outage AML 511s T30 (AML 511s Crossings), AML 511s SVC Plus (AML 511s Crossings), AML 511s 1152 (AML 511s Crossings) annual fire system maintenance on the SVC+ 9.5 Hours
Daily		  
20-Nov-25 07:00 21-Nov-25 17:00 ATCO TE 951s Protection & Control (951s Thickwood Hills) firmware upgrades on 94BA/SVS (SEL-2440) and 94BA/SVS (SEL-2440), including post upgrade commissioning 1.42 Days
Continuous		  
20-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE APS# 112 Cypress 562s - Power/Under & Over Frequency Scheme, 562s Protection & Control (562s Cypress) adding supervisory controls to RAS112 scheme 9 Hours
Daily		  
20-Nov-25 08:00 20-Nov-25 15:00 ALTALINK Outage 312s 552 (312s Fidler) splitting alarm contact and wiring each alarm point from breaker control cabinet to D25 in control building 7 Hours
Daily		  
20-Nov-25 08:00 24-Nov-25 16:00 ENMAX IO Protection & Control (SS-1) initial energization 1.1TR 4.33 Days
Continuous		  
20-Nov-25 08:00 20-Nov-25 16:00 SUNCOR TE 29EDD-5 Protection & Control (29EDD-5), 30EDD-1 Protection & Control (30EDD-1) urgent communication cabling and card swap out to correct communications issue 8 Hours
Continuous		  
20-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 242s RTU/SCADA (242s Flat Lake) upgrade MPLS node 9 Hours
Daily		  
20-Nov-25 08:00 20-Nov-25 17:00 ALTALINK TE AltaLink Telecom Equipment, 28s RTU/SCADA (28s West Brooks) 2025 MPLS firmware upgrade 9 Hours
Daily		  
20-Nov-25 09:00 21-Nov-25 17:00 ATCO TE ATCO Telecom Equipment, 767s RTU/SCADA (767s Oyen) low BES firewall install - outage to local network & SCADA communications 1.33 Days
Continuous		  
20-Nov-25 09:00 20-Nov-25 17:00 ATCO TE ATCO Telecom Equipment, 825s Whitefish Lake RTU/SCADA Whitefish Lake_S_Telecom - firewall install - outage to local network & SCADA communications 8 Hours
Continuous		  
20-Nov-25 09:00 21-Nov-25 17:00 BCH IO T4 (BCH Natal) NTL 2CB2 BFPN, 2CT2 inspection 1.33 Days
Continuous		 AB-BC
21-Nov-25 07:00 22-Nov-25 17:00 ATCO TE 951s Protection & Control (951s Thickwood Hills) firmware upgrades on 87VB-51B-27B-59B/920C (SEL-487V) and 51-27-59/920C (SEL-351S) including post upgrade commissioning 1.42 Days
Continuous		  
21-Nov-25 07:00 25-Nov-25 18:00 NWE, BHE Canada, BHE Outage Hay Lake (NorthWestern Energy) - Marias (MATL), North Series Capacitor (BHE Hay Lake), Marias Shunt Capacitor, 2302 (NWE Marias), 2305 (NWE Marias) string wire into Marias from new Glacier sub and install new airbreaks 4.46 Days
Continuous		 AB-MATL
21-Nov-25 08:00 02-Dec-25 21:00 SUNCOR TE 29EDD-94 29-952-9707 (29EDD-94 Voyageur), 29EDD-94 29-952-9708 (29EDD-94 Voyageur), 29EDD-94 29-952-9709 (29EDD-94 Voyageur), 29EDD-94 29-952-9710 (29EDD-94 Voyageur), 29EDD-94 29-952-9711 (29EDD-94 Voyageur), 29EDD-94 29-952-9712 (29EDD-94 Voyageur) perform rolling regulatory GE C60 firmware 8.6 updates on the following breakers at 29EDD-94 - 952-9707/9708/9709/9712/9711/9710 11.54 Days
Continuous		  
21-Nov-25 08:00 21-Nov-25 17:30 ALTALINK TE 678s RTU/SCADA (678s Okotoks) major SCADA upgrade project.-replacement of D20 RTU with new SG-4260 data concentrator, deficiency cleanup and complete points check 9.5 Hours
Daily		  
21-Nov-25 08:00 24-Nov-25 16:00 ENMAX IO Protection & Control (SS-1) Initial energization 1.2TR 3.33 Days
Continuous		  
21-Nov-25 08:00 24-Nov-25 16:00 ENMAX IO Protection & Control (SS-1) initial energization 1.3TR 3.33 Days
Continuous		  
21-Nov-25 08:00 24-Nov-25 16:00 ENMAX IO Protection & Control (SS-1) initial energization 1.4TR 3.33 Days
Continuous		  
21-Nov-25 08:00 24-Nov-25 16:00 ENMAX IO Protection & Control (SS-1) initial energization new 1 sub diameter Q01, Q02, Q03, Q04 Z32 Bus 138kV, Z31 Bus 138kV 3.33 Days
Continuous		  
21-Nov-25 08:00 21-Nov-25 17:30 ALTALINK TE 678s Protection & Control (678s Okotoks) major SCADA upgrade project-replacement of D20 RTU with new SG-4260 data concentrator and deficiency cleanup 9.5 Hours
Daily		  
21-Nov-25 08:00 21-Nov-25 12:00 ENMAX Outage 3.3TR (SS-3) oil sampling - 3.3-TC, MT snd Silica Gel Canister upgrade - 3.3 TR - MT 4 Hours
Continuous		  
21-Nov-25 08:00 20-Dec-25 16:00 ENMAX Outage 38.3TR (SS-38) 38.3TR secondary cable replacement 29.33 Days
Continuous		  
21-Nov-25 08:30 21-Nov-25 17:30 ALTALINK Outage 678s T2 (678s Okotoks), 678s 452 (678s Okotoks) completing deficiencies on T2 OLTC SCADA controls 9 Hours
Daily		  
21-Nov-25 09:00 24-Nov-25 16:00 ATCO Outage 9L56 (720s Wabasca - 732s Mitsue), 732s 904 (732s Mitsue), 732s 906 (732s Mitsue) protection upgrade 3.29 Days
Continuous		  
21-Nov-25 09:00 21-Nov-25 13:00 ATCO RB 7L63 (780s Lubicon - 812s Norcen), 7L63 (788s Hotchkiss - 7LA63 tap) high load move lift bottom phase 4 Hours
Continuous		  
21-Nov-25 09:00 21-Nov-25 15:06 BCH Outage 2CB2 (BCH Nelway) 5CB13 CN PM BC maintenance does not affect the Alberta ATC 6.1 Hours
Continuous		 AB-BC
21-Nov-25 09:30 21-Nov-25 18:00 ATCO Outage 7L65 (710s Vermilion - 7LA65 tap), 710s 703 (710s Vermilion) relocate breaker 703 controls to a new smaller mounting plate 8.5 Hours
Continuous		  
21-Nov-25 11:00 21-Nov-25 15:00 ATCO RB 7L23 (732s Mitsue - 7L23 tap), 7L23 (796s Nipisi - 7L23 tap) high load move lift bottom phase 2 locations - 7L23-212 & 7L23-440 4 Hours
Continuous		  
21-Nov-25 18:00 23-Nov-25 08:00 ENMAX, ALTALINK IO 936L (5s East Calgary - 102s Langdon) crew working in vicinity of 937L 1.58 Days
Continuous		  
21-Nov-25 18:00 23-Nov-25 08:00 ENMAX, ALTALINK Outage 937L (5s East Calgary - 102s Langdon) re-conductor between str 15 to 18 on both circuits for line clearance mitigation 1.58 Days
Continuous		  
21-Nov-25 18:00 23-Nov-25 08:00 ENMAX, ALTALINK Outage 936L (5s East Calgary - 102s Langdon) crew working in vicinity of 937L 1.58 Days
Continuous		  
21-Nov-25 18:00 23-Nov-25 08:00 ENMAX, ALTALINK IO 937L (5s East Calgary - 102s Langdon) re-conductor between str 15 to 18 on both circuits for line clearance mitigation 1.58 Days
Continuous		  

Prepared On:   2025-11-14   15:33:17

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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