Alberta Electric System Operator
System Co-ordination Plan
2026-07-25 to 2026-07-31
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 17,646 Hours
Continuous		  
20-Mar-25 08:00 31-Jul-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 11,961 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		  
27-May-26 18:00 27-Jul-26 10:29 ALTALINK Outage 526s C1 (526s Buffalo Creek) forced outage 1,456.48 Hours
Daily		  
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 08:00 31-Jul-26 16:00 ENMAX Outage 40.1TR (SS-40) secondary cabinet measurements and CT testing 392 Hours
Continuous		  
15-Jul-26 11:00 27-Jul-26 16:00 ATCO, ALTALINK Outage 6L126 (743s Sarah Lake - 515L tap), 743s 601 (743s Sarah Lake) 743S Sarah lake rebuild. Replace breaker 601 317 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 29-Jul-26 09:00 ALTALINK Outage 77s 40 (77s Sagitawah) protection upgrade 218 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 07:30 29-Jul-26 08:30 ATCO, ALTALINK RB 9L938 (77s Sagitawah - 809s Louise Creek) reclosing blocked for AltaLink 217 Hours
Continuous		  
20-Jul-26 08:00 27-Jul-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole replacement from test and treat 176 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		  
21-Jul-26 07:00 27-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 21A/6L126 for relay testing 154.5 Hours
Continuous		  
21-Jul-26 07:00 27-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 21B/6L126 for relay testing 154.5 Hours
Continuous		  
21-Jul-26 07:00 27-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 86-50BF-1/600BS1 and 94-50BF-1/600BS1 (50BF-600BS1) 154.5 Hours
Continuous		  
21-Jul-26 07:00 27-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/601 for relay testing 154.5 Hours
Continuous		  
21-Jul-26 08:00 29-Jul-26 16:00 ENMAX Outage 1.80L (SS-1 - SS-28), 28B138-1.80 (SS-28) transmission tower climbing inspection 200 Hours
Continuous		  
21-Jul-26 08:00 25-Jul-26 12:00 ENMAX Outage 20.82L (SS-20 - SS-21) transmission tower climbing inspection 100 Hours
Continuous		  
23-Jul-26 08:00 29-Jul-26 16:00 ALTALINK TE 77s RTU/SCADA (77s Sagitawah) RTU database update 152 Hours
Daily		  
23-Jul-26 08:00 25-Jul-26 16:00 Syncrude Outage 211 (Aurora) replace failed interposing relay 56 Hours
Continuous		  
24-Jul-26 07:30 29-Jul-26 16:30 ALTALINK Outage 304s 352 (304s Shell Limestone), 304s T2 (304s Shell Limestone) customer maintenance.
129 Hours
Continuous		  
25-Jul-26 07:00 25-Jul-26 12:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s40 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		  
25-Jul-26 08:00 25-Jul-26 18:00 ENMAX Outage 9.80L (SS-9 - SS-31), 9.1TR (SS-9), 9MD138-9.1TR (SS-9), 9B138-9.80 (SS-9) substation structure painting 10 Hours
Continuous		  
25-Jul-26 11:00 29-Jul-26 17:00 ALTALINK, ENMAX IO 42s 21 (42s Sarcee), 21.80L (42s Sarcee - SS-21) ENMAX Work - Transmission tower climbing inspection 102 Hours
Continuous		  
25-Jul-26 12:00 29-Jul-26 16:00 ENMAX, ALTALINK Outage 21.80L (42s Sarcee - SS-21), 21B138-21.80 (SS-21) transmission tower climbing inspection 104 Hours
Continuous		  
25-Jul-26 12:01 25-Jul-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s40 4.98 Hours
Continuous		  
26-Jul-26 06:30 26-Jul-26 12:29 ALTALINK Outage 77s 652 (77s Sagitawah) trip test 77s652 5.98 Hours
Daily		  
26-Jul-26 07:00 26-Jul-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) 77s40 breaker fail trip testing 10 Hours
Daily		  
26-Jul-26 07:00 27-Jul-26 16:30 ALTALINK Outage 412s T1 (412s Shell Eagle Creek) maintenance - NGR 33.5 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		  
26-Jul-26 08:00 26-Jul-26 16:00 ENMAX Outage 32.83L (SS-32 - SS-40), 40.1TR (SS-40), 32B138-32.83 (SS-32), 40B138-32.83 (SS-40) power factor test - 40PT138-Z31 8 Hours
Continuous		  
26-Jul-26 10:00 26-Jul-26 16:00 ALTALINK RB 723L (150s Clyde - 438s Westlock), 723L (438s Westlock - 724L tap), 723L (69s North Barrhead - 724L tap), 724L (500s Flatbush - 724L tap), 724L (723L tap - 724AL tap) 724L Structure 64 Urgent Repair Cross arm Change. 6 Hours
Daily		  
26-Jul-26 12:30 26-Jul-26 18:00 ALTALINK Outage 77s 752 (77s Sagitawah) trip test 77s752 5.5 Hours
Daily		  
27-Jul-26 06:30 27-Jul-26 12:30 ALTALINK Outage 77s 29 (77s Sagitawah) trip test 77s29 6 Hours
Daily		  
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 07:00 28-Jul-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) isolate protections for 2152 CT testing 34 Hours
Daily		  
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 28-Jul-26 17:00 ALTALINK Outage 310p 2152 (310p Sundance) test 310p2152 CTs 33 Hours
Continuous		  
27-Jul-26 08:00 28-Jul-26 16:00 ENMAX Outage 16.60L (SS-16 - SS-34), 34B69-16.60 (SS-34), 16B69-16.60 (SS-16) HV breaker maintenance 32 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 28-Jul-26 16:00 ALTALINK TE 33s Protection & Control (33s Spray) techs to complete PRC standard maintenance on the listed devices 32 Hours
Continuous		  
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 27-Jul-26 16:00 ENMAX Outage 33.84L (SS-33 - SS-43), 33.2TR (SS-33), 33B138-33.84 (SS-33), 43B138-33.84 (SS-43) power factor test 8 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 27-Jul-26 11:00 ATCO TE ATCO Telecom Equipment, 848s RTU/SCADA (848s Ruth Lake) Ruth Lake_S-Telecom- Telecom upgrade 2 Hours
Continuous		  
27-Jul-26 09:00 28-Jul-26 18:00 ALTALINK Outage 773L (127s Bruderheim - 308s Albchem Beaverhill Creek), 308s 773E (308s Albchem Beaverhill Creek), 127s 773W (127s Bruderheim) 773L line maintenance
33 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 09:00 27-Jul-26 20:00 BCH RB 5L92 (BCH Cranbrook - BCH Selkirk) 5L92 LLP/ANR - barehand insulator replacement 11 Hours
Continuous		 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 27-Jul-26 16:00 ATCO TE ATCO Telecom Equipment, 769s RTU/SCADA (769s Stettler) radio major, digital MDR 8502 PM @ Stettller 1769 (to Lonepine) 6 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		  
27-Jul-26 12:31 27-Jul-26 17:30 ALTALINK Outage 77s 57 (77s Sagitawah) trip test 77s57 4.98 Hours
Continuous		  
28-Jul-26 00:00 28-Jul-26 06:00 EPCOR Outage EP 511s Victoria T4 (EP 511s Victoria) secondary cable removal on TX3 in TX3/TX4 reactor bay 6 Hours
Continuous		  
28-Jul-26 07:00 28-Jul-26 19:00 ALTALINK TE 77s Protection & Control (77s Sagitawah), 77s 37 (77s Sagitawah) protection outages for trip testing 12 Hours
Daily		  
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 07:30 29-Jul-26 16:30 ALTALINK Outage 531s T1 (531s Shell Schrader Creek) customer work 33 Hours
Continuous		  
28-Jul-26 08:00 29-Jul-26 17:00 ALTALINK TE AltaLink Telecom Equipment MW upgrade at the hop between 163s Amoco Empress and 9278R majestic radio 33 Hours
Continuous		  
28-Jul-26 08:00 29-Jul-26 16:00 ENMAX Outage 2.80L (SS-2 - SS-23), 23.3TR (SS-23), 23B138-2.80 (SS-23) power factor test 32 Hours
Continuous		  
28-Jul-26 08:00 28-Jul-26 22:00 ATCO TE ATCO Telecom Equipment, 951s RTU/SCADA (951s Thickwood Hills), 939s RTU/SCADA (939s Livock) Thickwood and Livock APL upgrading network switches 14 Hours
Continuous		  
28-Jul-26 08:00 28-Jul-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 635s RTU/SCADA (635s Rose Valley) radio maintenance 8 Hours
Daily		  
28-Jul-26 08:00 28-Jul-26 16:00 ENMAX Outage 6.80L (SS-6 - SS-35), 6B138-6.80 (SS-6) distribution crew working under line 8 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 08:00 28-Jul-26 16:00 ALTALINK TE AltaLink Telecom Equipment radio maintenance
8 Hours
Daily		  
28-Jul-26 08:30 28-Jul-26 18:00 ALTALINK Outage 522L (133L tap - 522AL tap), 522L (866s Sundance Make-Up - 522AL tap), 522AL (868s Keephills Make-Up - 522L tap) replace 522L STR 71
9.5 Hours
Continuous		  
28-Jul-26 09:00 28-Jul-26 17:00 ATCO TE ATCO Telecom Equipment, 789s RTU/SCADA (789s Keg River), 789s Protection & Control (789s Keg River) Keg River telecom battery transfer 8 Hours
Continuous		  
28-Jul-26 09:00 28-Jul-26 10:00 ATCO TE ATCO Telecom Equipment Whitecourt_T-Telecom 1 Hour
Continuous		  
28-Jul-26 09:00 28-Jul-26 16:00 ATCO TE ATCO Telecom Equipment Debolt telecom and Kleskun telecom updates 7 Hours
Continuous		  
28-Jul-26 09:00 29-Jul-26 17:00 ATCO TE ATCO Telecom Equipment card replacement
 32 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 09:00 28-Jul-26 17:00 ATCO TE 700s RTU/SCADA (700s Bonnyville) RTU outage 8 Hours
Continuous		  
28-Jul-26 09:00 28-Jul-26 17:00 ATCO TE 707s RTU/SCADA (707s St. Paul) RTU outage 8 Hours
Continuous		  
28-Jul-26 09:00 28-Jul-26 17:00 ATCO TE 715s RTU/SCADA (715s Leming Lake) RTU outage 8 Hours
Continuous		  
28-Jul-26 09:00 28-Jul-26 17:00 ATCO TE 717s RTU/SCADA (717S Ethel Lake) RTU outage 8 Hours
Continuous		  
28-Jul-26 09:00 28-Jul-26 17:00 ATCO TE 837s Mahihkan RTU/SCADA RTU outage 8 Hours
Continuous		  
28-Jul-26 09:00 28-Jul-26 17:00 ATCO TE 846s Grand Centre RTU/SCADA RTU outage 8 Hours
Continuous		  
28-Jul-26 09:00 28-Jul-26 17:00 ATCO TE 940s RTU/SCADA (940s Beartrap) RTU outage 8 Hours
Continuous		  
28-Jul-26 09:30 29-Jul-26 16:30 ALTALINK Outage 178s C1 (178s Cynthia) 138kV breaker maintenance 31 Hours
Continuous		  
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 29-Jul-26 17:00 ALTALINK TE 341s RTU/SCADA (341s Sand Hills Sub), AltaLink Telecom Equipment firewall upgrade and MPLS node firmware upgrade 9 Hours
Continuous		  
29-Jul-26 08:00 29-Jul-26 12:00 ALTALINK TE 35s Protection & Control (35s Rundle) for fault reporting project 4 Hours
Continuous		  
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 08:00 29-Jul-26 16:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) protection outage for trip testing 8 Hours
Daily		  
29-Jul-26 08:00 29-Jul-26 16:00 ALTALINK TE AltaLink Telecom Equipment SyncE configuration through the radio and perform CorEvo functional testing 8 Hours
Daily		  
29-Jul-26 08:00 29-Jul-26 16:00 ENMAX Outage 27.1TR (SS-27) hot spot HV bushing center phase - riser connection 8 Hours
Continuous		  
29-Jul-26 08:30 29-Jul-26 16:30 ATCO, ALTALINK RB 9L938 (77s Sagitawah - 809s Louise Creek) reclosing blocked for AltaLink 8 Hours
Continuous		  
29-Jul-26 09:00 29-Jul-26 11:00 ATCO TE ATCO Telecom Equipment upgrading Cassils NET 2 and NET 11 SAR OS 2 Hours
Continuous		  
29-Jul-26 09:00 29-Jul-26 16:00 ATCO TE ATCO Telecom Equipment radio maintenance at Clairmont and Poplar Hill 7 Hours
Continuous		  
29-Jul-26 09:00 30-Jul-26 18:00 ALTALINK Outage 776L (308s Albchem Beaverhill Creek - 410s Josephburg), 308s 776W (308s Albchem Beaverhill Creek) line maintenance
33 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 09:00 29-Jul-26 17:00 ATCO TE 706s RTU/SCADA (706s Irish Creek) changing the password on 2 ION meters 8 Hours
Continuous		  
29-Jul-26 09:00 29-Jul-26 17:00 ATCO TE 705s RTU/SCADA (705s Kitscoty) changing the password on 2 ION meters 8 Hours
Continuous		  
29-Jul-26 09:00 29-Jul-26 17:00 ATCO TE 710s RTU/SCADA (710s Vermilion) changing the password on 2 ION Meters 8 Hours
Continuous		  
29-Jul-26 09:00 29-Jul-26 17:00 ATCO TE 751s RTU/SCADA (751s Hill) changing the password on 2 ION meters 8 Hours
Continuous		  
29-Jul-26 09:00 29-Jul-26 17:00 ATCO TE 918s RTU/SCADA (918s Bauer) changing the password on 2 ION meters 8 Hours
Continuous		  
29-Jul-26 09:00 29-Jul-26 17:00 ATCO TE 956s RTU/SCADA (956s Watt Lake) changing the password on 2 ION meters 8 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 07:30 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 16:00 ALTALINK TE 356s Protection & Control (356s Milo) 927L settings changes for metering updates 8 Hours
Daily		  
30-Jul-26 08:00 30-Jul-26 16:00 ALTALINK TE 356s RTU/SCADA (356s Milo) configuration updates for L4 protection metering updates 8 Hours
Daily		  
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		  

Prepared On:   2026-07-24   15:30:06

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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