Alberta Electric System Operator
System Co-ordination Plan
2026-07-30 to 2026-08-07
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
26-Jul-24 10:00 30-Jun-27 16:00 ATCO Outage 826s 504R (826s Marguerite Lake) emergency removal to replace failed 502R @834S 25,662 Hours
Continuous		  
20-Mar-25 08:00 07-Aug-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 12,129 Hours
Continuous		  
25-Nov-25 17:46 18-Sep-26 18:00 ATCO Outage 876s 901T (876s Brintnell) forced outage oil leaking 7,127.23 Hours
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 17,528 Hours
Daily		  
04-Jan-26 08:00 02-Sep-26 16:00 SUNCOR Outage 29EDD-34 260kV Bus 29PP-45 (29EDD-34), 29EDD-34 29-952-113 (29EDD-34), 29EDD-34 29PS-216 (29EDD-34) urgent repairs on 29PT-224 at 29EDD34 on 29PP-45 bus 5,791 Hours
Continuous		  
21-Jan-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV switchgear replacement 6,775 Hours
Continuous		  
06-Mar-26 17:00 13-Nov-26 17:00 EPCOR Outage T1 (Woodcroft) woodcroft: TX1 LCR civil 6,048 Hours
Continuous		  
10-Mar-26 10:00 30-Nov-26 17:00 ATCO TE 743s RTU/SCADA (743s Sarah Lake) throughout the course of the project, different apparatus are being replaced, RTU will be blocked prior to download 6,368 Hours
Continuous		  
11-Mar-26 13:45 15-Sep-26 08:59 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 4,507.23 Hours
Continuous		  
01-May-26 17:00 25-Nov-26 17:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 4,993 Hours
Continuous		  
19-May-26 07:00 02-Oct-26 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking - relay maintenance and bus differential upgrade project 2,434 Hours
Continuous		  
04-Jun-26 07:01 10-Feb-27 17:00 EPCOR Outage T1 (Rossdale) rossdale: TX1 lcr civil 6,034.98 Hours
Continuous		  
07-Jun-26 17:05 01-Oct-26 00:00 ACCIONA, ENBRIDGE, ICPCL Outage 139s C1 (139s Hillridge) forced outage 2,766.92 Hours
Continuous		  
08-Jun-26 07:00 04-Dec-26 17:00 EPCOR TE EP 511s Protection & Control (EP 511s Victoria) 72kV breaker fail protection blocking 2,626 Hours
Continuous		  
15-Jun-26 07:00 04-Sep-26 17:00 EPCOR TE 805s Protection & Control (805s Jasper) protection blocking, breaker replacement project 1,954 Hours
Continuous		  
19-Jun-26 17:00 03-Dec-27 17:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria) emergency outage due to degraded asset condition 12,769 Hours
Continuous		  
10-Jul-26 08:00 18-Nov-26 16:00 Syncrude Outage 815 (Syncrude Mildred Lake), 816 (Syncrude Mildred Lake) replace 72 kV underground feeder cables on west mine feeder 2,696 Hours
Continuous		  
14-Jul-26 00:00 31-Aug-26 00:00 ALTALINK Outage 151s C1 (151s Strathmore) forced outage 1,152 Hours
Continuous		  
14-Jul-26 08:00 01-Oct-26 17:00 ALTALINK IO 287s 552 (287s Hazelwood) 287s552 must be open during 443L and 417L outage for the 214s AIS to work properly 1,905 Hours
Continuous		  
14-Jul-26 11:56 31-Aug-26 00:00 ATCO Outage 7L91 (715s Leming Lake - 826s Marguerite Lake) forced outage 1,140.07 Hours
Continuous		  
15-Jul-26 14:01 28-Sep-26 09:00 ALTALINK Outage 417L (55s Olds - 281s Johnson), 55s T1 (55s Olds), 55s T2 (55s Olds), 55s 417 (55S Olds), 287s 552 (287s Hazelwood), 55s 2 (55s Olds) mobile install at 55s for P_C major upgrade, repair/replace s80, s83, s84. salvage s51. 1,962.98 Hours
Continuous		  
20-Jul-26 07:00 02-Aug-26 17:00 EPCOR Outage 987s T1 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CCP7214 (987s Clover Bar), 987s C2401 (987s Clover Bar), 987s C2403 (987s Clover Bar), 987s CDS25 (987s Cloverbar) Cloverbar: breaker maintenance and CT doble and relay maintenance 322 Hours
Continuous		  
20-Jul-26 07:00 31-Jul-26 17:00 ALTALINK, EPCOR TE 908AL (52S East Industrial - 908L tap) 908LW: protection blocking for MPLS cutovers and commissioning 274 Hours
Continuous		  
20-Jul-26 07:00 31-Jul-26 17:00 ALTALINK, EPCOR TE 1059AL (52s East Industrial - 1059L tap), 1059L (EP 803s Lambton - 1059AL tap) 1059L: protection blocking for MPLS cutovers and commissioning 274 Hours
Continuous		  
20-Jul-26 07:00 30-Jul-26 17:00 ALTALINK TE 238s RTU/SCADA (238s Shell Harmattan) RTU configuration update 250 Hours
Daily		  
20-Jul-26 07:00 31-Dec-26 17:00 EPCOR TE Protection & Control (Woodcroft) woodcroft: protection blocking for TX1 LCR, line protection testing, and repairs 3,947 Hours
Continuous		  
20-Jul-26 07:00 04-Sep-26 17:00 EPCOR TE 330p Protection & Control (330p Genesee) genesee: protection blocking, firmware updates 1,114 Hours
Continuous		  
20-Jul-26 08:00 31-Jul-26 16:00 ALTALINK, EPCOR TE 38s Protection & Control (38s East Edmonton), 1059AL (52s East Industrial - 1059L tap), 1059L (38s East Edmonton - 1059AL tap), 1059L (EP 803s Lambton - 1059AL tap) relay testing and cutover EPCOR Ref. #: OE114341 272 Hours
Continuous		  
20-Jul-26 08:00 31-Jul-26 16:00 ALTALINK, EPCOR TE 38s Protection & Control (38s East Edmonton), 89s Protection & Control (89s Ellerslie), 908L (38s East Edmonton - 908AL tap), 908AL (52S East Industrial - 908L tap), 908L (89s Ellerslie - 816s Petrolia), 908L (89s Ellerslie - 908AL tap) relay testing and cutover OE114342
272 Hours
Continuous		  
20-Jul-26 08:00 30-Jul-26 15:00 CMH TE MH-60L (MHS-5 NE Crescent Heights - MHS-7 Brier Park) perform preventative maintenance on LDR-60L-A 247 Hours
Continuous		  
20-Jul-26 14:30 07-Aug-26 17:00 ALTALINK Outage 1083L (63s Red Deer - 288s Wolf Creek), 63s 452 (63s Red Deer), 63s 552 (63s Red Deer), 288s 352 (288s Wolf Creek), 288s 152 (288s Wolf Creek), 288s 1083 (288s Wolf Creek), 63s 1083 (63s Red Deer) 63s452 breaker replacement 434.5 Hours
Continuous		  
25-Jul-26 07:00 31-Jul-26 18:00 ATCO, ALTALINK IO 9L948 (650s Hansman Lake - 863s Paintearth) Altalink request: 26-13220 uUrgent 948L replace structures 89 & 186 131 Hours
Continuous		  
25-Jul-26 07:00 31-Jul-26 18:00 ATCO, ALTALINK RB 953L (574s Nilrem - 755s Cordel) working on 948L186 155 Hours
Daily		  
25-Jul-26 07:00 31-Jul-26 18:00 ALTALINK RB 1047L (574s Nilrem - 650s Hansman Lake) working on 948L89 urgent repair 155 Hours
Daily		  
25-Jul-26 07:00 31-Jul-26 18:00 ATCO, ALTALINK RB 9L953 (574s Nilrem - 755s Cordel) reclosing blocked on 9L953 for AltaLink work 155 Hours
Continuous		  
25-Jul-26 07:30 31-Jul-26 18:00 ATCO, ALTALINK Outage 948L (650s Hansman Lake - 863s Paintearth), 863s 902 (863s Paintearth) urgent 948L replace structures 89 & 186 131 Hours
Continuous		  
26-Jul-26 08:00 08-Aug-26 16:00 Syncrude Outage 14 (Aurora), 213 (Aurora), 223 (Aurora), 24 (Aurora), 34 (Aurora), 260kV Bus 2 (Aurora), 72 kV Bus 2 (Aurora), T11 (Aurora), 89-216 (Aurora), 89-52 (Aurora) zone 1 6 year PM at Aurora 272 Hours
Continuous		  
27-Jul-26 07:00 04-Sep-26 17:00 EPCOR Outage EP 805s J2401 (EP 805s Jasper) Jasper: J2401 replacement LCR 946 Hours
Continuous		  
27-Jul-26 07:00 07-Aug-26 17:00 ALTALINK, EPCOR TE 1045L (EP 805s Jasper - 1045AL tap) protection blocking for MPLS cutovers and commissioning 274 Hours
Continuous		  
27-Jul-26 07:30 31-Jul-26 15:00 CMH Outage MH-9L (MHS-2 North Industrial - MHS-10 Box Springs), MHS-10 MH138-1002 (MHS-10 Box Springs), MHS-10 MH138-1013 (MHS-10 Box Springs), MHS10 MH138-T101 (MHS-10 Box Springs), MHS-2 MH138-218 (MHS-2 North Industrial), MHS-10 MH138-1005 (MHS-10 Box Springs), MHS2 MH138-T23 (MHS-2 North Industrial), MHS-2 MH69-217 (MHS-2 North Industrial) perform NETA maintenance and PRC-005 maintenance
 103.5 Hours
Continuous		  
27-Jul-26 08:00 30-Jul-26 17:00 ALTALINK, TRANSALTA Outage 179s 733 (179s Gleichen), 428s 733X (428s Namaka), 733L (179s Gleichen - 428s Namaka) interphase spacers str: 181, 193, 195, 196
repair conductor with sleeve or preform splice: 181,193, 195, 196
str change: 211 (foundation in concrete)
arm/insulator change str: 161, 163, 165		 81 Hours
Continuous		  
27-Jul-26 08:00 30-Jul-26 16:00 ALTALINK TE 62s RTU/SCADA (62s Brazeau Plant) update LAN switch settings 80 Hours
Continuous		  
27-Jul-26 08:00 30-Jul-26 16:00 ALTALINK TE 33s Protection & Control (33s Spray) 33s Spray Facility 76L (L1) line prot, 84L (L4) line prot, 113L (L2) line prot, protection outages to implement fault reporting 80 Hours
Daily		  
27-Jul-26 08:00 30-Jul-26 16:00 ALTALINK TE 33s RTU/SCADA (33s Spray) RTU outage required to implement config changes during fault reporting project 80 Hours
Daily		  
27-Jul-26 08:00 31-Jul-26 16:00 ALTALINK TE 391s RTU/SCADA (391s Balzac) RAS scheme addition to L5 protections due to P3075- Balzac Area Load project 104 Hours
Daily		  
27-Jul-26 08:00 31-Jul-26 16:00 ALTALINK TE 391s Protection & Control (391s Balzac) RAS scheme addition due to P3075- Balzac Area Load project 104 Hours
Daily		  
27-Jul-26 08:00 07-Aug-26 16:00 ALTALINK IO 310p Protection & Control (310p Sundance), 320p Protection & Control (320P Keephills) 1045L/1045AL (Sundance 310P -Keephills 320P-E805 Jasper Terminal EPCOR): relay testing and cutover, protection blocking

272 Hours
Continuous		  
27-Jul-26 08:00 30-Jul-26 16:00 ENMAX Outage 9.1TR (SS-9), 9BB8-9.1TR (SS-9), 9BA8-9.1TR (SS-9) transformer power factor test 80 Hours
Continuous		  
27-Jul-26 08:00 30-Jul-26 17:00 ALTALINK TE 391s Protection & Control (391s Balzac) protection outages required for reconfiguring of DC distribution 81 Hours
Daily		  
27-Jul-26 08:00 30-Jul-26 17:00 ATCO, CNRL, ALBIAN TE 847s Muskeg River, 919s Hartley maintenance and verification of revenue metering 81 Hours
Continuous		  
27-Jul-26 08:00 30-Jul-26 16:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) RTU outage required for alarm changes/ firmware update for 320p192 breaker replacement 80 Hours
Continuous		  
27-Jul-26 08:30 31-Jul-26 18:00 ALTALINK, EPCOR Outage 310p 1352 (310p Sundance), 310p 1452 (310p Sundance), 909L (310p Sundance - 665s Dome), 665s D2403 (665s Dome), 665s DDS14 (665s Dome) 909LW/Dome: CVT/SA doble and DDS6/DDS7/DDS14 disconnect maintenance and 909LW relay maintenance 105.5 Hours
Continuous		  
27-Jul-26 09:00 31-Jul-26 17:30 ALTALINK, EPCOR RB 809L (320p Keephills - 510s Sunnybrook) 809L: reclose block for aerial washing program 104.5 Hours
Continuous		  
27-Jul-26 09:00 31-Jul-26 17:00 BCH RB 2L113 (BCH Cranbrook - BCH Natal) LLP work - Hazard tree removals between 10-01 to 44-01 104 Hours
Daily		 AB-BC
27-Jul-26 09:30 31-Jul-26 17:00 ALTALINK, EPCOR IO 909L (310p Sundance - 665s Dome), 665s D2403 (665s Dome) 909LW/Dome: CVT/SA Doble and DDS6/DDS7/DDS14 Disconnect Maintenance and D2403 Dashpot Repair and 909LW Relay Maintenance 103.5 Hours
Continuous		  
27-Jul-26 09:30 31-Jul-26 17:00 ALTALINK, EPCOR RB 809L (320p Keephills - 510s Sunnybrook) aerial washing 103.5 Hours
Continuous		  
27-Jul-26 10:00 31-Jul-26 17:30 ATCO Outage 801s 901T (801s Anderson), 801s 704 (801s Anderson) prc-005 - spr testing 103.5 Hours
Continuous		  
27-Jul-26 10:00 30-Jul-26 16:00 ATCO TE 810s RTU/SCADA (810s Dome Cutbank) PRC-006 - 2026 UFLS program setting change - 5L318 at 810S 78 Hours
Continuous		  
27-Jul-26 10:00 30-Jul-26 16:00 ATCO TE 754s RTU/SCADA (754s Ksituan River) PRC-006 - 2026 UFLS program settings change - 5L403 at 754S 78 Hours
Continuous		  
27-Jul-26 10:00 30-Jul-26 16:00 ATCO TE 741s RTU/SCADA (741s Fox Creek) PRC-006 - 2026 UFLS program settings change - 5L123 at 741S 78 Hours
Continuous		  
27-Jul-26 10:00 30-Jul-26 16:00 ATCO TE 798s RTU/SCADA (798s Bridge Creek) PRC-006 - 2026 UFLS program settings change - 5L535 at 798S
 78 Hours
Continuous		  
27-Jul-26 10:00 30-Jul-26 16:00 ATCO TE 734s RTU/SCADA (734s Sturgeon) PRC-006 - 2026 UFLS program setting change - 5L465 at 734S 78 Hours
Continuous		  
27-Jul-26 10:00 31-Jul-26 16:00 ATCO Outage 705s 702T (705s Kitscoty), 705s 702 (705s Kitscoty) transformer maintenance 102 Hours
Continuous		  
27-Jul-26 10:00 30-Jul-26 14:00 ATCO Outage 827s 701T (827s Cranberry Lake) class2 major testing
 76 Hours
Continuous		  
27-Jul-26 10:30 04-Aug-26 16:00 ALTALINK Outage 526s 652 (526s Buffalo Creek) replace 526s652 breaker 197.5 Hours
Continuous		  
27-Jul-26 11:00 30-Jul-26 14:00 ATCO Outage 7L85 (801s Anderson - ATC 803s Bullpound), 801s 701T (801s Anderson), 801s 711 (801s Anderson), 801s 705 (801s Anderson), 801S 701TD (801s Anderson) interphase spacer install, deficiency repairs & cross arm replacement between Bullpound and Anderson 75 Hours
Continuous		  
27-Jul-26 12:00 31-Jul-26 12:00 ATCO TE 833s RTU/SCADA (833s Mariana) substation RTU updates 96 Hours
Continuous		  
27-Jul-26 12:00 31-Jul-26 12:00 ATCO TE 833s Protection & Control (833s Mariana) block 87TB/701T protection for a setting update 96 Hours
Continuous		  
28-Jul-26 07:00 14-Aug-26 17:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria), EP 511s V724 (EP 511s Victoria), EP 511s V725 (EP 511s Victoria), EP 511s VAB3 (EP 511s Victoria) TX3 extended zone for demolition 418 Hours
Continuous		  
28-Jul-26 08:00 30-Jul-26 16:00 ENMAX Outage 33.1TR (SS-33) investigate leak on 33.1TR H2 bushing 56 Hours
Continuous		  
28-Jul-26 09:00 30-Jul-26 17:00 BCH Outage 2L294 (BCH A. A. Lambert - BCH Nelway) maintenance 56 Hours
Continuous		 AB-BC
28-Jul-26 10:00 10-Aug-26 16:00 ATCO Outage 6L11 (743s Sarah Lake - 854s Swan Dive), 743s 603 (743s Sarah Lake) 743S Sarah lake rebuild - replace breaker 603 318 Hours
Continuous		  
29-Jul-26 07:00 31-Jul-26 17:00 EPCOR Outage S722 (Strathcona) breaker maintenance and CT doble 58 Hours
Continuous		  
29-Jul-26 07:00 30-Jul-26 16:00 ALTALINK Outage 310p 152 (310p Sundance) test 310p152 CTs 33 Hours
Continuous		  
29-Jul-26 07:00 30-Jul-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) 152 CT testing
34 Hours
Daily		  
29-Jul-26 08:00 30-Jul-26 16:00 ENMAX Outage 16.63L (SS-16 - SS-36), 16B69-16.63 (SS-16), 36B69-16.63/36.5TR (SS-36) breaker maintenance 32 Hours
Continuous		  
29-Jul-26 09:00 30-Jul-26 18:00 ALTALINK Outage 767AL (21s Marion - 767L tap), 767L (310p Sundance - 767AL tap), 767L (767AL tap - 767CL tap), 21s 152 (21s Marion), 21s 1 (21s Marion) replace arms and glass and repair woodpecker damage 33 Hours
Continuous		  
29-Jul-26 23:00 30-Jul-26 03:00 ALTALINK Outage 62s T1 (62s Brazeau Plant), 62s 1 (62s Brazeau Plant) maintenence 4 Hours
Continuous		  
30-Jul-26 03:00 30-Jul-26 07:00 ALTALINK Outage 62s 2 (62s Brazeau Plant), 62s T2 (62s Brazeau Plant) maintenence 3 Hours
Continuous		  
30-Jul-26 06:00 05-Aug-26 16:00 SUNCOR Outage 635EDD-1000 635PT-1002 (635EDD-1000) planned maintenance on 72kV Bus 635PP-1002 154 Hours
Continuous		  
30-Jul-26 07:00 30-Jul-26 18:00 ENMAX, ALTALINK IO 162.81L (391s Balzac - SS-162) add LTO's to 162.81L L5 protections for temporary RAS scheme addition 11 Hours
Continuous		  
30-Jul-26 07:00 30-Jul-26 17:00 EPCOR Outage PM2405 (Poundmaker) emergency low SF6 gas top up 10 Hours
Continuous		  
30-Jul-26 07:30 30-Jul-26 18:00 ENMAX, ALTALINK Outage 162.81L (391s Balzac - SS-162), 391s 162.81 (391s Balzac), 162B138-RB80 (SS-162), 162B138-RB81 (SS-162) add LTO's to 162.81L L5 protections for temporary RAS scheme addition, add new 43M/552 to 391s162.81 11 Hours
Continuous		  
30-Jul-26 08:00 30-Jul-26 17:00 ALTALINK TE 562s RTU/SCADA (562s Cypress) split the existing SCADA VLAN from 1 to 1 and 2, telecom switch and firewall upgrade 9 Hours
Continuous		  
30-Jul-26 08:00 30-Jul-26 16:00 ENMAX TE Protection & Control (SS-28) 28PT138-Z31 outage, power factor test - 28PT138-Z31 8 Hours
Continuous		  
30-Jul-26 09:00 30-Jul-26 16:00 ATCO TE ATCO Telecom Equipment radio PM Kleskun 1262 (to Crystal Lake)
IRU firmware update		 7 Hours
Continuous		  
30-Jul-26 09:00 30-Jul-26 17:00 ATCO TE ATCO Telecom Equipment Flat Top_T-Telecom- upgrading flat top tower net 1 SAR OS to V22 8 Hours
Continuous		  
30-Jul-26 09:00 07-Aug-26 17:00 BCH RB 5L92 (BCH Cranbrook - BCH Selkirk) 5L92 LLP/ANR - barehand insulator replacement 200 Hours
Continuous		 AB-BC
30-Jul-26 11:00 30-Jul-26 16:00 ALTALINK TE 317s RTU/SCADA (317s Baseline), AltaLink Telecom Equipment repair radio
5 Hours
Continuous		  
31-Jul-26 07:30 06-Aug-26 16:30 ALTALINK Outage 378s T1 (378s Shell Caroline) customer work 153 Hours
Continuous		  
31-Jul-26 08:00 06-Aug-26 16:00 SUNCOR Outage 29EDD-1 29EDD1s152 (29EDD-1 Millennium) maintenance & trip test 156 Hours
Continuous		  
31-Jul-26 08:00 31-Jul-26 16:00 ALTALINK TE 163s Protection & Control (163s Amoco Empress) update the relay communication settings 8 Hours
Continuous		  
31-Jul-26 08:00 31-Jul-26 16:00 ALTALINK TE 163s RTU/SCADA (163s Amoco Empress) updating the IP address for the RTU and all the P&C relays at site 8 Hours
Continuous		  
31-Jul-26 08:00 06-Aug-26 20:00 ATCO, SUNCOR TE 29PL9-2 (29EDD-1 Millennium - 848s Ruth Lake), 29EDD-1 Protection & Control (29EDD-1 Millennium) protection isolation 156 Hours
Continuous		  
31-Jul-26 08:00 01-Aug-26 16:00 ENMAX Outage 2.83L (SS-13 - 2.83L tap), 13B138-2.83 (SS-13) power factor test and breaker maintenance 32 Hours
Continuous		  
31-Jul-26 09:00 31-Jul-26 10:00 ATCO TE ATCO Telecom Equipment, 907s RTU/SCADA (907s Waddell), 917s RTU/SCADA (917s Horse River), 885s RTU/SCADA (885s McMillan), 7L38 (875s Algar - 917s Horse River) Algar telecom tower upgrade 1 Hour
Continuous		  
01-Aug-26 08:00 31-Aug-26 20:00 SUNCOR Outage 29EDD-60 29PT-702 (29EDD-60 Inglis Island) IBP pressure low 732 Hours
Continuous		  
01-Aug-26 08:00 01-Aug-26 20:00 SUNCOR IO Suncor RTU/SCADA (Suncor) annual maintenance 12 Hours
Continuous		  
03-Aug-26 07:00 04-Aug-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) CT1452 testing 34 Hours
Daily		  
03-Aug-26 08:00 28-Aug-26 16:00 ENMAX Outage 2.82L (SS-2 - SS-5), 5B138-2.82 (SS-5) 2.82 A phase replacement in MH2299. 12hr soak test required prior to carrying load. no phasing required on return to service. 608 Hours
Continuous		  
03-Aug-26 08:00 04-Aug-26 17:00 ALTALINK Outage 310p 1452 (310p Sundance) Test 310p1452 CTs 33 Hours
Continuous		  
03-Aug-26 08:00 04-Aug-26 17:00 ALTALINK, EPCOR RB 909L (310p Sundance - 665s Dome) AltaLink reclose block 33 Hours
Continuous		  
03-Aug-26 08:00 04-Sep-26 16:00 ENMAX TE Protection & Control (SS-5) 5 sub zone 31 auto switching protection scheme outage, 25kV switchgear addition 776 Hours
Daily		  
03-Aug-26 08:00 14-Aug-26 15:00 CMH TE MH-60L (MHS-5 NE Crescent Heights - MHS-7 Brier Park) maintenance on the LDR-60L-B 271 Hours
Continuous		  
03-Aug-26 08:00 06-Aug-26 16:00 ALTALINK TE 163s Protection & Control (163s Amoco Empress) momentarily blocking the protection to isolate the CT contribution from T5 clip on CT 80 Hours
Daily		  
03-Aug-26 08:00 30-Oct-26 16:00 ALTALINK TE 55s RTU/SCADA (55s Olds) adding/testing new alarms & controls associated with the 55s P&C 2,120 Hours
Daily		  
03-Aug-26 09:00 03-Aug-26 10:00 ATCO TE 903s RTU/SCADA (903s Loyalist), ATCO Telecom Equipment upgrade 1 Hour
Continuous		  
04-Aug-26 07:00 07-Aug-26 17:00 EPCOR Outage 72JW19 (EP 805s Jasper - Woodcroft), EP 805s J724 (EP 805s Jasper), W721 (Woodcroft), EP 805s JDS28 (EP 805s Jasper) JW19: doble and JDS28, JDS19 disconnect maintenance 82 Hours
Continuous		  
04-Aug-26 07:00 10-Aug-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 21B/6L11 for relay testing. 154.5 Hours
Continuous		  
04-Aug-26 07:00 10-Aug-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/603 for relay testing 154.5 Hours
Continuous		  
04-Aug-26 07:00 10-Aug-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay isolation 21A/6L11 for testing 154.5 Hours
Continuous		  
04-Aug-26 07:00 10-Aug-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) 86-50BF/600BS1. 94-50BF/600BS1 for testing 154.5 Hours
Continuous		  
04-Aug-26 07:00 04-Aug-26 17:00 EPCOR Outage RR723 (Rossdale) Rossdale: RR723 Repair 10 Hours
Continuous		  
04-Aug-26 07:00 08-Aug-26 17:00 EPCOR TE Protection & Control (Garneau) Garneau: protection blocking for RG1/RG7/MG16 setting updates. 106 Hours
Continuous		  
04-Aug-26 07:00 06-Aug-26 17:00 EPCOR Outage 72RV6 (EP 511s Victoria - Rossdale), EP 511s V723 (EP 511s Victoria), EP 511s V724 (EP 511s Victoria), RV722 (Rossdale), EP 511s VDS9 (EP 511s Victoria) Victoria: RV6 Zone, clearance to remove TX3 from site. emergency project. 58 Hours
Continuous		  
04-Aug-26 07:03 05-Sep-26 17:00 ALTALINK Outage 869L (163s Amoco Empress - 204s Sandy Point), 204s T1 (204s Sandypoint), 163s 869W (163s Amoco Empress) customer maintenance work 777.95 Hours
Continuous		  
04-Aug-26 07:30 13-Aug-26 08:30 ALTALINK Outage 77s 652 (77s Sagitawah) protection upgrade 77s652 217 Hours
Continuous		  
04-Aug-26 08:00 24-Aug-26 12:00 ENMAX, ALTALINK Outage 24.83L (74s Janet - SS-24) Wood pole installation 416 Hours
Continuous		  
04-Aug-26 08:00 24-Aug-26 16:00 ALTALINK, ENMAX Outage 74s 24.83X (74s Janet), 24.83L (74s Janet - SS-24) Enmax Wood pole installation 488 Hours
Continuous		  
04-Aug-26 08:00 13-Aug-26 16:00 ALTALINK TE 62s RTU/SCADA (62s Brazeau Plant) replace RTU 224 Hours
Continuous		  
04-Aug-26 08:00 05-Aug-26 16:00 ALTALINK TE 217s RTU/SCADA (217s North Red Deer), AltaLink Telecom Equipment MPLS node A&B upgrade + raw socket - loss of 217s visibility for 2 hours in the timeframe indicated, various TPR outage 32 Hours
Daily		  
04-Aug-26 08:00 06-Aug-26 16:00 ALTALINK TE 186s RTU/SCADA (186s Dry Creek) supervisory outages to upgrade meter modules 56 Hours
Continuous		  
04-Aug-26 08:00 10-Aug-26 16:00 ATCO RB 7L48 (787s High Prairie - 7L48 tap), 7L48 (794s Valleyview - 7LA48 tap) changing rotten poles and cross arm. 152 Hours
Continuous		  
04-Aug-26 08:00 04-Aug-26 16:00 ENMAX TE Protection & Control (SS-65) 65 sub 86BF D85 lockout relay protection outage. relays, lockout testing 65RLY138-D85., back up fault clearing time 5.5 cycles 8 Hours
Continuous		  
04-Aug-26 09:00 06-Aug-26 17:00 ALTALINK, TRANSALTA Outage 733L (179s Gleichen - 428s Namaka), 179s 733 (179s Gleichen), 428s 733X (428s Namaka) 733Lstr. 161-211 Crossarm work. Maintenance/repairs. 56 Hours
Continuous		  
04-Aug-26 09:00 04-Aug-26 10:00 ATCO TE ATCO Telecom Equipment, 700s RTU/SCADA (700s Bonnyville) Bonnyville Sub net 1SAR OS upgrade
 1 Hour
Continuous		  
04-Aug-26 09:00 06-Aug-26 17:30 ATCO Outage 2029s 1302 (2029s Heathfield) Dc high speed switch maintenance 56.5 Hours
Continuous		  
04-Aug-26 09:00 06-Aug-26 17:00 ENMAX, ALTALINK Outage 5s T2 (5s East Calgary), MD113 (SS-2) 5sT2 PRC doble , major maint 56 Hours
Continuous		  
04-Aug-26 09:00 23-Aug-26 13:00 BCH Outage 5L91 (BCH Ashton Creek - BCH Selkirk) maintenance, BC maintenance does not affect the Alberta ATC 460 Hours
Continuous		 AB-BC
04-Aug-26 09:00 04-Aug-26 17:00 ENMAX, ALTALINK IO 5s T2 (5s East Calgary) Altalink outage, removing 5s T2 from service for maintenance 8 Hours
Continuous		  
04-Aug-26 09:00 09-Aug-26 17:30 ALTALINK RB 501CL (983s Cadomin - 501L tap), 501L (426s Coalspur - 501CL tap) urgent repairs, replace arms,insulation, and structure

128.5 Hours
Daily		  
04-Aug-26 10:00 05-Aug-26 17:30 ATCO Outage 959s 701 (959s Lanfine) breaker SF6 GL312 testing 31.5 Hours
Continuous		  
04-Aug-26 10:00 05-Aug-26 16:30 ALTALINK Outage 74s 104 (74s Janet), 74s 103 (74s Janet), 74s 102 (74s Janet), 74s C3 (74s Janet), 74s C4 (74s Janet) 74s103 Major maint 30.5 Hours
Continuous		  
04-Aug-26 10:00 04-Aug-26 14:00 ATCO RB 705s 144kV Bus (705s Kitscoty) disconnect 2000S 144kV risers 4 Hours
Continuous		  
04-Aug-26 10:00 05-Aug-26 17:00 ATCO Outage 7L131 (834s Wesley Creek - 905s Meikle), 834s 708 (834s Wesley Creek), 834s 710 (834s Wesley Creek), 905S 7L131D1 (905s Meikle) 708 densimeters replacement, investigate heater fail 31 Hours
Continuous		  
04-Aug-26 10:00 04-Aug-26 16:00 ALTALINK TE 681s Protection & Control (681s Bannerman) card replacements 6 Hours
Daily		  
04-Aug-26 10:00 04-Aug-26 16:00 ALTALINK TE 618s RTU/SCADA (618s Riverbend) techs to replace LAN-ES1 6 Hours
Continuous		  
04-Aug-26 11:00 05-Aug-26 12:00 ATCO RB 7L24 (846s Grand Centre - 7LA24 tap), 7L24 (700s Bonnyville - 7LA24 tap) straighten structure 25 Hours
Continuous		  
04-Aug-26 13:00 10-Aug-26 15:00 ATCO RB 7L85 (801s Anderson - ATC 803s Bullpound), 7L85 (803s ATC Bullpound - 7LA85 tap), 7L85 (804s Wintering Hills - 7LA85 tap) installing interphase spacers 146 Hours
Continuous		  
04-Aug-26 13:00 06-Aug-26 16:30 ALTALINK Outage 453L (305s Acheson - 367s Harry Smith), 305s 453 (305s Acheson), 367s 453 (367s Harry Smith) 138kV breaker maintenance 51.5 Hours
Continuous		  
05-Aug-26 07:00 21-Aug-26 17:00 EPCOR Outage 72LH8 (EP 803s Lambton - EP Hardisty) aerial pole LCR (3 poles) and surge arrestor repair and HDS13 repair 394 Hours
Continuous		  
05-Aug-26 07:00 06-Aug-26 16:00 ALTALINK Outage 310p 2852 (310p Sundance) test 310p2852 CTs 33 Hours
Continuous		  
05-Aug-26 07:00 05-Aug-26 11:30 EPCOR Outage 987s C1 (987s Clover Bar) bus differential protection upgrade cutovers 4.5 Hours
Continuous		  
05-Aug-26 07:00 06-Aug-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) isolate protections for CT2852 testing 34 Hours
Daily		  
05-Aug-26 07:30 10-Aug-26 13:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) installing interphase spacers on 7L760 live line 126 Hours
Daily		  
05-Aug-26 08:00 05-Aug-26 18:00 Syncrude TE Syncrude ICCP Outage SCADA - server update whole Syncrude visibility loss 10 Hours
Daily		  
05-Aug-26 08:00 10-Aug-26 13:00 ATCO RB 7L760 (767s Oyen - 7LC760 tap), 7L760 (7LA760 tap - 7LC760 tap) installing interphase spacers 125 Hours
Daily		  
05-Aug-26 08:00 05-Aug-26 16:00 ALTALINK TE 432s RTU/SCADA (432s Carvel), AltaLink Telecom Equipment 9393R - upgrade radio software 8 Hours
Continuous		  
05-Aug-26 08:00 05-Aug-26 12:00 ENMAX Outage 65B138-D85 (SS-65) breaker SF6 gas sample - 65B138-D85 4 Hours
Continuous		  
05-Aug-26 08:00 05-Aug-26 17:00 ALTALINK TE AltaLink Telecom Equipment, 55s RTU/SCADA (55s Olds) moving radio from existing building to new Control Building 9 Hours
Daily		  
05-Aug-26 08:00 05-Aug-26 12:00 ENMAX Outage 35B138-80 (SS-35) breaker trip circuit test 4 Hours
Continuous		  
05-Aug-26 08:00 10-Aug-26 15:00 ATCO RB 7L159 (770s Three Hills - 7L159 tap) pole straightening and deficiency repair 127 Hours
Continuous		  
05-Aug-26 08:00 05-Aug-26 16:00 ALTALINK TE 356s Protection & Control (356s Milo) techs to complete settings change on the 923L A21/L2 7SA522 protection 8 Hours
Continuous		  
05-Aug-26 08:00 05-Aug-26 16:00 ALTALINK TE 348s RTU/SCADA (348s Marlboro), AltaLink Telecom Equipment antenna replacement at 39S shooting to 348S 8 Hours
Daily		  
05-Aug-26 08:00 06-Aug-26 16:00 ENMAX Outage 39.2TR (SS-39) relay protection test - 39RLY138-39.2TR and GE. reversing switch check - 39.2-TC 32 Hours
Continuous		  
05-Aug-26 09:00 05-Aug-26 11:00 ATCO TE ATCO Telecom Equipment upgrade Chain Lake A SAR OS to V21 then V22
2 Hours
Continuous		  
05-Aug-26 09:00 06-Aug-26 17:00 ATCO TE ATCO Telecom Equipment COM
M PLS life cycle upgrades to SAR A
, new SAR A, SDI cards 1.3/1.4 slots

 32 Hours
Continuous		  
05-Aug-26 09:00 05-Aug-26 17:30 ALTALINK Outage 77s 26 (77s Sagitawah) 77s26 CT testing 55.5 Hours
Continuous		  
05-Aug-26 10:00 05-Aug-26 12:00 ATCO RB 7L76 (786s High Level - 832s Blumenort) high load move escort 2 Hours
Continuous		  
05-Aug-26 11:00 10-Aug-26 14:00 ATCO RB 6L56 (763s Hanna - 802s Michichi Creek) 10 year climbing inspection 123 Hours
Continuous		  
05-Aug-26 12:00 05-Aug-26 17:00 EPCOR Outage 987s GB1B (987s Clover Bar) bus differential protection upgrade cutovers 5 Hours
Continuous		  
05-Aug-26 12:00 05-Aug-26 16:00 ENMAX Outage 47B138-BT3 (SS-47) breaker SF6 gas sample - 47B138-BT3 4 Hours
Continuous		  
05-Aug-26 12:00 05-Aug-26 16:00 ENMAX Outage 35B138-81 (SS-35) breaker trip circuit test 4 Hours
Continuous		  
05-Aug-26 13:00 05-Sep-26 13:00 ATCO TE 2085s Protection & Control (2085s Sheridan) power quality meter install at 2085s Sheridan
 744 Hours
Continuous		  
06-Aug-26 07:00 12-Aug-26 17:00 ALTALINK Outage 378s T2 (378s Shell Caroline), 378s 852 (378s Shell Caroline) customer work 154 Hours
Continuous		  
06-Aug-26 08:00 06-Aug-26 17:00 ALTALINK Outage 180s T2 (180s Cope Creek), 180s 252 (180s Cope Creek) 180s252 heater change/investigation 9 Hours
Continuous		  
06-Aug-26 08:00 06-Aug-26 12:00 ENMAX Outage 65B138-D81 (SS-65) HV breaker SF6 gas sample 4 Hours
Continuous		  
06-Aug-26 08:00 06-Aug-26 16:00 ALTALINK TE 310p RTU/SCADA (310p Sundance), AltaLink Telecom Equipment MPLS Node A&B&C upgrade - loss of 310p visibility for 2 hours in the timeframe indicated 8 Hours
Daily		  
06-Aug-26 08:00 06-Aug-26 12:00 ENMAX Outage 35B138-82 (SS-35) breaker trip circuit test - 35B138-82 4 Hours
Continuous		  
06-Aug-26 08:00 11-Aug-26 17:00 SUNCOR Outage 635EDD-1000 635PT-1003 (635EDD-1000) planned maintenance on 72kV bus 635PP-1003 129 Hours
Continuous		  
06-Aug-26 08:00 06-Aug-26 17:00 ATCO TE ATCO Telecom Equipment, 705s RTU/SCADA (705s Kitscoty) both firewalls at the Kitscoty_S will undergo a scheduled firmware upgrade so that we can maintain system security and ensure no bugs in the system
705S visibility impacted for 10 min.		 9 Hours
Continuous		  
06-Aug-26 08:00 06-Aug-26 17:00 ATCO TE ATCO Telecom Equipment, 716s RTU/SCADA (716s Lloydminster) both firewalls at the LLOYDMINSTER_S will undergo a scheduled firmware upgrade so that we can maintain system security and ensure no bugs in the system.
716S visibility will be impacted for 10 min		 9 Hours
Continuous		  
06-Aug-26 08:00 06-Aug-26 17:00 ATCO TE ATCO Telecom Equipment, 768s RTU/SCADA (768s Rowley) both firewalls at the 768s Rowley_S will undergo a scheduled firmware upgrade so that we can maintain system security and ensure no bugs in the system.
loss of visibility at 768S for 10 mins		 9 Hours
Continuous		  
06-Aug-26 09:00 06-Aug-26 10:00 ATCO TE ATCO Telecom Equipment, 819s Whitby Lake RTU/SCADA, 707s RTU/SCADA (707s St. Paul) upgrade the hairy hill "a" sar operating system from version 21 to version 22 1 Hour
Continuous		  
06-Aug-26 09:00 06-Aug-26 16:00 ATCO TE ATCO Telecom Equipment harris contestation major PM. Radio will be out of service from 10am-2pm. team at both ends of the link
TPRCP022 / 7L75 RAS A&B WEST PEACE KSITUAN
TPRCP037 / 7L75 A&B WEST PEACE / FRIEDENSTALL		 7 Hours
Continuous		  
06-Aug-26 09:00 06-Aug-26 17:00 ALTALINK Outage 283s 30 (283s Violet Grove) 283s31 CT testing 8 Hours
Daily		  
06-Aug-26 09:00 07-Aug-26 17:00 ATCO Outage 7L12 (834s Wesley Creek - 7LA12 tap), 834s 710 (834s Wesley Creek), 834s 710B (834s Wesley Creek), 834s 704 (834s Wesley Creek), 788s 7L120D1 (788s Hotchkiss) breaker SF6 GL312 complete testing - 710 @ 834s
710B is non-operational.		 32 Hours
Continuous		  
06-Aug-26 09:00 06-Aug-26 16:00 ALTALINK TE 799s RTU/SCADA (799s Coleman) tech to push RTU configuration to address and issue with 25Kv bus analogs 7 Hours
Continuous		  
06-Aug-26 09:00 06-Aug-26 12:00 ALTALINK TE 359s RTU/SCADA (359s Esso West Pembina), AltaLink Telecom Equipment MPLS upgrade node A - loss of 359s visibility for 2 hours in the indicated timeframe. 359s generator visibility impacts - Keyera notified 3 Hours
Daily		  
06-Aug-26 12:00 06-Aug-26 16:00 ENMAX Outage 35B138-83 (SS-35) breaker trip circuit test 4 Hours
Continuous		  
06-Aug-26 12:01 06-Aug-26 16:00 ENMAX Outage 65B138-D84 (SS-65) HV breaker SF6 gas sample 3.98 Hours
Continuous		  
06-Aug-26 14:01 06-Aug-26 20:00 SUNCOR Outage 29EDD-1 29EDD1s252 (29EDD-1 Millennium) 29EDD1 29CVT-1/29PL9-2 SYS PVM 5Y 10Y PRC-005 trip test 29EDD1s252, trip and reclose the breaker 5.98 Hours
Continuous		  
07-Aug-26 07:00 07-Aug-26 17:00 EPCOR Outage 72LS24 (EP 803s Lambton - Strathcona), S724 (Strathcona) S724 SF6 breaker maintenance 10 Hours
Continuous		  
07-Aug-26 07:00 13-Aug-26 16:00 ALTALINK TE 77s RTU/SCADA (77s Sagitawah) RTU database update 153 Hours
Daily		  
07-Aug-26 08:00 17-Aug-26 16:00 Syncrude Outage MH1 (Aurora - Aurora), 24 (Aurora), 23 (Aurora) zone 11 6yr preventative maintenance 248 Hours
Continuous		  
07-Aug-26 08:00 08-Aug-26 16:00 ENMAX RB 33.84L (SS-33 - SS-43) pole hold 32 Hours
Continuous		  
07-Aug-26 08:30 07-Aug-26 09:30 ATCO TE ATCO Telecom Equipment upgrading relay OS 1 Hour
Continuous		  

Prepared On:   2026-07-29   14:54:04

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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