Alberta Electric System Operator
System Co-ordination Plan
2026-08-27 to 2026-09-04
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 30-Sep-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 13,425 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 16-Oct-26 20:00 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 18-Dec-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 22-Oct-26 17:00 ALTALINK Outage 287s 552 (287s Hazelwood) 287s552 must be open during 443L and 417L outage for the 214s AIS to work properly 1,905 Hours
Continuous		  
15-Jul-26 14:01 22-Oct-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 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		  
27-Jul-26 10:00 31-Aug-26 17:00 ATCO Outage 827s 701T (827s Cranberry Lake) class2 major testing
 76 Hours
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		  
03-Aug-26 08:00 28-Aug-26 16:00 ENMAX Outage 2.82L (SS-2 - SS-5), 5B138-2.82 (SS-5) A phase replacement, 12 hr soak test 608 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 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		  
04-Aug-26 07:03 17-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		  
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		  
10-Aug-26 07:30 02-Oct-26 17:00 ALTALINK Outage 434s T3 (434s East Stony Plain) T3 transformer replacement 1,281.5 Hours
Continuous		  
13-Aug-26 16:31 24-Sep-26 17:00 ALTALINK Outage 71s T1 (71s Lamoureux) bushing issue 1,008.48 Hours
Continuous		  
13-Aug-26 16:31 27-Aug-26 17:00 ALTALINK Outage 71s C2 (71s Lamoureux), 71s 1052 (71s Lamoureux) issue with cap bank 336.48 Hours
Continuous		  
14-Aug-26 10:00 28-Aug-26 17:30 ATCO Outage 7L65 (709s Vegreville - 7LA65 tap), 709s 703 (709s Vegreville) 7L65 rebuild - phase 3 - protection upgrade at 709S, 708S and 710S
343.5 Hours
Continuous		  
17-Aug-26 07:00 27-Aug-26 18:00 ENMAX Outage 27.1TR (SS-27) emergency outage 251 Hours
Continuous		  
17-Aug-26 08:00 27-Aug-26 16:00 Syncrude Outage MH2 (Aurora - Aurora), 33 (Aurora), 34 (Aurora), 33B (Aurora), 34A (Aurora), 89-37 (Aurora) zone 13 6yr PM 248 Hours
Continuous		  
17-Aug-26 08:00 27-Aug-26 15:00 CMH TE MH-15L (MHS-7 Brier Park - MHS-9 South Saskatchewan) carry out maintenance on the LDR-15L-A 247 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) MPLS TPR re-arrangements project: 908L (Ellerslie 89S -Petrolia E816s) relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) 930L (North Calder 37S -Poundmaker EPCOR) relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 367s Protection & Control (367s Harry Smith) 1139L (Harry Smith 367S -Riverview EPCOR) MPLS TPR re-arrangements project, EPCOR relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) 920LE (North Calder 37S -E557s Castle Downs EPCOR) EPCOR relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 71s Protection & Control (71s Lamoureux) 920LW (Lamoreux 71S -E557s Castle Downs EPCOR) MPLS TPR re-arrangements project, EPCOR relay testing and cutover 608 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 908L (89s Ellerslie - 816s Petrolia) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 1139L (367s Harry Smith - EP Riverview) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 930L (37s North Calder - Poundmaker) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 1045L (EP 805s Jasper - 1045AL tap) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 920L (71s Lamoureux - 557s Castle Downs) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 09:30 11-Sep-26 17:00 ALTALINK, EPCOR TE 920L (37s North Calder - 557s Castle Downs) protection blocking for MPLS cutovers and commissioning 607.5 Hours
Continuous		  
17-Aug-26 10:00 27-Aug-26 17:30 ATCO TE 2075s Protection & Control (2075s Newell) 20DL02.06+R1-F873 (9L1087) relay firmware upgrade 271.5 Hours
Continuous		  
18-Aug-26 07:30 27-Aug-26 08:30 ALTALINK Outage 77s 752 (77s Sagitawah) protection upgrade 77s752 217 Hours
Continuous		  
20-Aug-26 09:00 09-Oct-26 10:00 ALTALINK Outage 58s T1 (58s Edson) 58s T1 transformer replacement and containment install 1,201 Hours
Continuous		  
22-Aug-26 07:00 27-Aug-26 17:00 ALTALINK TE 77s RTU/SCADA (77s Sagitawah) RTU database update 130 Hours
Daily		  
22-Aug-26 08:00 28-Aug-26 16:01 ATCO TE ATCO RTU/SCADA EMSI upgrade on the SCADA system application at both the SOC and SOC2 locations 152 Hours
Continuous		  
24-Aug-26 07:00 30-Aug-26 17:00 EPCOR Outage 557s T2 (557s Castle Downs), 557s CD2403 (557s Castle Downs), 557s CD2404 (557s Castle Downs), 557s CDAB2 (557s Castle Downs) Castledowns: TX2 tap changer and disconnect switch maintenance 154 Hours
Continuous		  
24-Aug-26 07:00 27-Aug-26 17:00 EPCOR Outage 72JM18 (EP 805s Jasper - Meadowlark), M721 (Meadowlark), EP 805s J722 (EP 805s Jasper), EP 805s JDS29 (EP 805s Jasper) JM18/Meadowlark: SA doble and MDS1 disconnect maintenance 82 Hours
Continuous		  
24-Aug-26 07:30 27-Aug-26 13:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) hop required for installing interphase spacers on 7L760 live line 78 Hours
Continuous		  
24-Aug-26 08:00 27-Aug-26 13:00 ATCO RB 7L760 (767s Oyen - 7LC760 tap) hop required for installing interphase spacers on 7L760 live line 77 Hours
Continuous		  
24-Aug-26 08:00 06-Sep-26 16:00 Syncrude Outage T3 (Aurora), 11 (Aurora), 12 (Aurora), G20 (Aurora), 89-15 (Aurora) outage to repair damaged 15kV bus ducting. 296 Hours
Continuous		  
24-Aug-26 08:00 27-Aug-26 16:00 ALTALINK TE 227s RTU/SCADA (227s Cutting Lake) RTU outage for minor config changes to prep for HMI replacement. no loss of controls. temporary alarms when minor changes are completed. 80 Hours
Daily		  
24-Aug-26 08:00 27-Aug-26 16:00 ENMAX Outage 38.2TR (SS-38) 38.2TR 8kV bus breaker alignment 38B8-38.14, 38B8-38.15, 38B8-38.16, 38B8-38.2TR, 38B8-38TT2 80 Hours
Continuous		  
24-Aug-26 08:00 27-Aug-26 16:00 ENMAX Outage 5.9TR (SS-5) transformer power factor test. secondary cable test. transformer maintenance. relay fault pressure test. 80 Hours
Continuous		  
24-Aug-26 09:00 01-Sep-26 17:00 ALTALINK, BCH Outage Path 1 (AIES Islanding), 1201L (520s Bennett - BCH Cranbrook), 520s 552 (520s Bennett), 5L94 (BCH Cranbrook - 520s Bennett), 520s 12 (520s Bennett), 5D25 (BCH Cranbrook) south crew will be doing Insulator and guy wire replacements 200 Hours
Continuous		 AB-BC
24-Aug-26 09:00 01-Sep-26 17:00 ALTALINK, BCH Outage 1L274 (BCH Natal - BCH Line Creek tap) opened because 1201L is out of service and BC needs this end open. 200 Hours
Continuous		 AB-BC
24-Aug-26 09:00 01-Sep-26 17:00 ALTALINK, BCH Outage 786L (799s Coleman - BCH Natal), 799s 786W (799s Coleman) opened because 1201L is out of service. 200 Hours
Continuous		 AB-BC
24-Aug-26 09:00 01-Sep-26 17:00 ALTALINK, BHE Outage MATL (120s Picture Butte - Montana) align with 1201L outage 200 Hours
Continuous		 AB-MATL
24-Aug-26 09:00 03-Sep-26 17:30 ALTALINK RB 1045AL (320p Keephills - 1045L tap), 1045L (310p Sundance - 1045AL tap) 1044L/1045L/1098L: Reclose Block for aerial washing program 248.5 Hours
Continuous		  
24-Aug-26 09:00 01-Sep-26 17:00 BCH Outage 5L92 (BCH Cranbrook - BCH Selkirk) replace spacers, markerballs and insulators 200 Hours
Continuous		 AB-BC
24-Aug-26 09:00 01-Sep-26 17:00 ALTALINK, BHE Canada Outage 120s 240kV Bus 1 (120s Picture Butte), 120s MATL PST (120s Picture Butte), 120s 1352 (120s Picture Butte), 120s 1152S (120s Picture Butte) 120s MATL: full substation outage, equipment maintenance 200 Hours
Continuous		  
24-Aug-26 09:30 03-Sep-26 17:00 EPCOR, ALTALINK RB 1098L (EP 805s Jasper - Poundmaker), 1044L (EP 805s Jasper - 816s Petrolia), 1045L (EP 805s Jasper - 1045AL tap) 1044L/1045L/1098L: reclose block for aerial washing program 247.5 Hours
Continuous		  
24-Aug-26 09:30 28-Aug-26 17:00 ALTALINK RB 792L (92s Viscount - 191s N.W. Cardiff) transmission line maintenance
103.5 Hours
Daily		  
24-Aug-26 11:00 27-Aug-26 17:00 ALTALINK Outage 883L (288s Wolf Creek - 429s Nelson Lake), 429s T1 (429s Nelson Lake), 429s 883W (429s Nelson Lake) transformer, regulator maint. doble, leak repairs, 429s8/13 cable cold shrink repair, 883L insulator replacement 78 Hours
Continuous		  
24-Aug-26 13:00 28-Aug-26 17:00 ALTALINK Outage 28s R1 (28s West Brooks) 28sR1 leak category 5, doble R1, 28s44 PRC5 (no first trip) 100 Hours
Continuous		  
24-Aug-26 13:00 04-Sep-26 13:00 ATCO Outage 7L228-1 (2091s Thornton - 7L20 tap) 7L228D2 line switch failure replacement, install BKR 703 264 Hours
Continuous		  
24-Aug-26 13:00 04-Sep-26 13:00 ATCO TE 2091s Protection & Control (2091s Thornton), 2091s RTU/SCADA (2091s Thornton) wiring and updating 21A & 21B 7L228 relays and settings, station controller and settings 264 Hours
Continuous		  
25-Aug-26 07:00 27-Aug-26 17:00 ALTALINK IO 77s 37 (77s Sagitawah) test the functionality of clearing the 240kV East Bus by simulating opening 77s37 as part of clearing the bus
58 Hours
Daily		  
25-Aug-26 07:00 21-Sep-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 21A/7L55 for relay testing and wiring, element will be out of service under GOI 2-81723 658 Hours
Continuous		  
25-Aug-26 08:00 21-Sep-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 21B/7L55 for relay testing and wiring, element will be out of service under GOI 2-81723 657 Hours
Continuous		  
25-Aug-26 08:00 21-Sep-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 86-50BF-1/700BS1, 94-50BF-1/700BS1 657 Hours
Continuous		  
25-Aug-26 08:00 21-Sep-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/701 for relay testing 657 Hours
Continuous		  
26-Aug-26 07:00 30-Aug-26 17:00 EPCOR Outage 52s T1 (52s East Industrial), 52s E2401 (52s East Industrial), 52s EDS1 (52s East Industrial) East Industrial: TX1 doble 106 Hours
Continuous		  
26-Aug-26 08:00 30-Aug-26 20:00 SUNCOR TE 29EDD-1 29EDD1s952 (29EDD-1 Millennium), 29EDD-1 29EDD1s752 (29EDD-1 Millennium) 29EDD1 / N260B2 north bus PRC-005 relay testig 108 Hours
Continuous		  
26-Aug-26 08:00 27-Aug-26 18:00 ENMAX Outage 33.2TR (SS-33), 33MD138-33.2TR (SS-33) 33.2TR CT terminal block replacement 34 Hours
Continuous		  
26-Aug-26 08:00 27-Aug-26 18:00 ENMAX TE Protection & Control (SS-33) 33sub Z31 138kVbus differential protection outage. 33.2TR CT terminal block replacement 34 Hours
Daily		  
26-Aug-26 08:00 04-Sep-26 16:00 ALTALINK TE 103s RTU/SCADA (103s Goose Lake) HMI replacement 224 Hours
Daily		  
26-Aug-26 08:30 27-Aug-26 16:00 ALTALINK TE 324s Protection & Control (324s Cassils) firmware update/protection testing on 1087L A87/21/L10 URL90 31.5 Hours
Continuous		  
26-Aug-26 09:30 27-Aug-26 16:00 ATCO Outage 856s 706 (856s Kinosis) PRC-005 trip coil testing, breaker maintenance 30.5 Hours
Continuous		  
26-Aug-26 09:30 27-Aug-26 17:30 ATCO TE 2011s RTU/SCADA (2011s Dawes) alternate settings group installation (for closing 875s 700D1) on 7L170 protection, both A and B
32 Hours
Continuous		  
26-Aug-26 09:30 27-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Capacity & Reliability upgrades
TPRCP019 / 9L930 B
TPRCP134 / 7L114 DTT CH FAIL
TPRFF124 / 9L45 A
TPRFF125 / 9L45 B
TPRCP221 / 9L55 & 1085L A
TPRCP222 / 9L55 & 1085L B		 30.5 Hours
Continuous		  
26-Aug-26 10:00 27-Aug-26 17:30 ATCO Outage 959s 702 (959s Lanfine) breaker SF6 GL312 testing - 702 @ 959s
prc-005 - trip coil testing - breaker 702 @ 959s
31.5 Hours
Continuous		  
26-Aug-26 10:00 27-Aug-26 16:00 ATCO Outage 815s 706 (815s Goodfare) breaker SF6 HPL complete testing - 706 @ 815s 30 Hours
Continuous		  
26-Aug-26 12:00 21-Sep-26 11:00 ATCO Outage 743s 701 (743s Sarah Lake), 743s 701A (743s Sarah Lake), 743s 7L55D3 (743s Sarah Lake), 7L55 (743s Sarah Lake - 809s Louise Creek), 809s 705 (809s Louise Creek) 743s Sarah lake rebuild 623 Hours
Continuous		  
26-Aug-26 14:00 01-Sep-26 18:00 SUNCOR Outage 29EDD-85 29PS-322 (29EDD-85), 29EDD-85 29PS-421 (29EDD-85), 29EDD-85 29PS-422 (29EDD-85), 29EDD-85 752-10010 (29EDD-85), 29EDD-85 752-10020 (29EDD-85) Firebag: 29EDD85;29PP-100A SYSTEM;PM 12Y, Testing on 29PT-424A/B/C, 29PS-421, 29PS-422, 29PS-322, 29PLA-110A/B/C,29PP-100A, associated PRC-5 testing 148 Hours
Continuous		  
27-Aug-26 07:00 27-Aug-26 11:30 EPCOR Outage 987s CC721 (987s Clover Bar), 987s T2 (987s Clover Bar) bus diff upgrade cutovers 4.5 Hours
Continuous		  
27-Aug-26 07:00 27-Aug-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) breaker fail protection outage for trip testing (77s752) 10 Hours
Daily		  
27-Aug-26 07:00 27-Aug-26 18:00 ALTALINK Outage 77s 452 (77s Sagitawah) trip test 77s452 11 Hours
Daily		  
27-Aug-26 07:30 28-Aug-26 19:30 ATCO, ALTALINK RB 913L (69s North Barrhead - 732s Mitsue) Installing marker cones on 9L913 at span 503. 36 Hours
Continuous		  
27-Aug-26 08:00 28-Aug-26 19:00 ATCO, ALTALINK RB 9L913 (69s North Barrhead - 732s Mitsue) installing marker cones 35 Hours
Continuous		  
27-Aug-26 08:00 27-Aug-26 12:00 ENMAX TE Protection & Control (SS-162) bus differential protection outage 4 Hours
Continuous		  
27-Aug-26 08:00 27-Aug-26 16:00 ENMAX Outage 2.80L (SS-2 - SS-23), 23B138-2.80 (SS-23) heater circuit contactor/ETS relay upgrades 8 Hours
Continuous		  
27-Aug-26 08:00 30-Aug-26 16:00 ALTALINK TE 388s RTU/SCADA (388s Riverside) to update the D20 RTU configuration to accommodate the customer DCS upgrade 80 Hours
Daily		  
27-Aug-26 08:00 01-Sep-26 18:00 SUNCOR Outage 635EDD-1000 635-752-113 (635EDD-1000), 635EDD-1000 635PT-1004 (635EDD-1000), 635EDD-1000 635PS-1037 (635EDD-1000) planned maintenance of diameter 1 130 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 11:00 ATCO TE ATCO Telecom Equipment, 741s RTU/SCADA (741s Fox Creek), 2018s RTU/SCADA (2018s Muir), APS# 218 Fox Creek 741S-7L90 Overload Mitigation Scheme upgrade tower 2 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 848s RTU/SCADA (848s Ruth Lake) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 907s RTU/SCADA (907s Waddell) changing password on 2 ION Meters. The meters provide the substation 500PT1 KV, 701T MW, 701T MVAR and FREQUENCY analog values to AESO. The meter will need less than 5 minutes to restart. 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 856s RTU/SCADA (856s Kinosis) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 860s RTU/SCADA (860s Crow) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 875s RTU/SCADA (875s Algar) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 888s RTU/SCADA (888s Dover) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 917s RTU/SCADA (917s Horse River) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 925s RTU/SCADA (925s Green Stocking) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 931s RTU/SCADA (931s Bohn) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 933s RTU/SCADA (933s Tower Road) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 977s RTU/SCADA (977s Salt Creek) changing password 8 Hours
Continuous		  
27-Aug-26 09:00 27-Aug-26 17:00 ATCO TE 989s RTU/SCADA (989s Quigley) changing password 8 Hours
Continuous		  
27-Aug-26 12:00 27-Aug-26 16:00 ENMAX TE 162.4TR (SS-162) 'A' protection outage 4 Hours
Continuous		  
27-Aug-26 23:00 28-Aug-26 05:00 EPCOR Outage EP 511s Victoria T3 (EP 511s Victoria), EP 511s Victoria T4 (EP 511s Victoria), EP 511s V724 (EP 511s Victoria), EP 511s V725 (EP 511s Victoria), EP 511s V726 (EP 511s Victoria), EP 511s VAB3 (EP 511s Victoria), EP 511s VAB4 (EP 511s Victoria) light standard removal for emergency T3 replacement project 6 Hours
Continuous		  
28-Aug-26 08:00 28-Aug-26 18:00 ENMAX Outage 240kV South Bus (SS-162), 138kV South Bus (SS-162), 162.2TR (SS-162), 162B240-RB133 (SS-162), 162B240-RB136 (SS-162), 162MD240-162.2TR (SS-162), 162B138-RB83 (SS-162), 162B138-RB84 (SS-162), 162B138-RB92 (SS-162), 162MD138-162.2TR (SS-162) summer substation washing 10 Hours
Continuous		  
28-Aug-26 08:00 28-Aug-26 19:00 ATCO Outage 7L90 (741s ATC Fox Creek - 7LA90 tap), 741s 701 (741s ATC Fox Creek) installing starclamps on conductor 11 Hours
Continuous		  
28-Aug-26 08:00 28-Aug-26 16:00 ALTALINK TE 520s RTU/SCADA (520s Bennett) to add the supervisory status/control for 1201L (L3) RAS 8 Hours
Continuous		 AB-BC
28-Aug-26 08:00 28-Aug-26 16:00 ALTALINK TE 520s Protection & Control (520s Bennett) enable supervisory control and indication for 1201L Selkirk RAS (B protection) 8 Hours
Continuous		 AB-BC
28-Aug-26 09:00 28-Aug-26 10:00 ATCO TE ATCO Telecom Equipment rebuilding to optimize the Mitsue / Louise Creek LSP and paths
IMPACT TO TPRCP108 / 9L40 A - LOUISE CREEK / MITSUE
Redundant protection in Place		 1 Hour
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2011s RTU/SCADA (2011s Dawes) changing the password on 2 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2014s RTU/SCADA (2014s Halfway) changing the password on 2 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2015s RTU/SCADA (2015s Yeo) changing the password on 2 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2032s RTU/SCADA (2032s Sweetheart Lake) changing the password on 1 ION meter 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2049s RTU/SCADA (2049s Kettle River) changing the password on 4 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2060s RTU/SCADA (2060s Engstrom) changing the password on 4 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2081s RTU/SCADA (2081s Meadow Creek) changing the password on 1 ION meter 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 2082s RTU/SCADA (2082s Dog Rib) changing the password on 1 ION meter 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 718s RTU/SCADA (718s Parsons Creek) changing the password on 2 ION meters 8 Hours
Continuous		  
28-Aug-26 09:00 28-Aug-26 17:00 ATCO TE 820s RTU/SCADA (820s Hangingstone) changing the password on 2 ION meters 8 Hours
Continuous		  
29-Aug-26 07:00 29-Aug-26 11:30 EPCOR Outage 72CH11 (987s Clover Bar - EP Hardisty), 987s CH724 (987s Clover Bar), H725 (EP Hardisty) Cloverbar - CH724 bus differential upgrade cutovers 4.5 Hours
Continuous		  
29-Aug-26 08:00 29-Aug-26 18:00 ENMAX Outage 21.4TR (SS-21), 15.60L (SS-15 - SS-21), 21.61L (SS-21 - SS-34) substation structure painting 10 Hours
Continuous		  
29-Aug-26 09:00 30-Aug-26 16:00 ATCO Outage 7L90 (813s Little Smoky - 7LA90 tap) 124 structure changes (poles/arms) between strs 1 - 157. 7L90 Pole replacement program 2026 31 Hours
Continuous		  
29-Aug-26 12:00 29-Aug-26 17:00 EPCOR Outage 72CH9 (987s Clover Bar - EP Hardisty), 987s CH722 (987s Clover Bar), H724 (EP Hardisty) Cloverbar - CH722 bus differential upgrade cutovers
5 Hours
Continuous		  
30-Aug-26 07:00 02-Sep-26 17:30 ALTALINK Outage 156L (235s Entwistle - 156BL tap), 235s 156E (235s Entwistle) 156L131 and 132 structure replacement 82.5 Hours
Continuous		  
30-Aug-26 08:00 30-Aug-26 16:00 ENMAX RB 40.81L (SS-40 - SS-41) fall transmission line washing 8 Hours
Continuous		  
30-Aug-26 10:00 30-Aug-26 12:59 SUNCOR Outage 29EDD-1 29EDD1s952 (29EDD-1 Millennium) PRC-005 relay testing - 29EDD-1 N260B2 north bus 2.98 Hours
Continuous		  
30-Aug-26 13:00 30-Aug-26 16:00 SUNCOR Outage 29EDD-1 29EDD1s752 (29EDD-1 Millennium) PRC-005 relay testing - 29EDD-1 N260B2 north bus 3 Hours
Continuous		  
31-Aug-26 07:00 13-Sep-26 17:00 EPCOR, ALTALINK Outage 72LH8 (EP 803s Lambton - EP Hardisty), 72LS24 (EP 803s Lambton - Strathcona), EP 803s T3 (EP 803s Lambton), EP 803s L2403 (EP 803s Lambton), EP 803s L2405 (EP 803s Lambton), EP 803s L721 (EP 803s Lambton), S724 (Strathcona), EP 803s LAB3 (EP 803s Lambton) breaker maintenance, drive pipe repair and T3 relay maintenance and zone doble 322 Hours
Continuous		  
31-Aug-26 07:00 01-Sep-26 17:00 EPCOR Outage 72NW15 (Namao - Woodcroft), N726 (Namao), W723 (Woodcroft) PT doble and disconnect maintenance 34 Hours
Continuous		  
31-Aug-26 07:00 17-Sep-26 17:00 ALTALINK Outage 869L (163s Amoco Empress - 204s Sandy Point), 204s T1 (204s Sandypoint), 163s 869W (163s Amoco Empress), 204s 869E (204s Sandy Point) 869L protection upgrades at 163s (Iconic), replace 869L line protections at 204s, replace T1 meter 346 Hours
Continuous		  
31-Aug-26 07:00 03-Sep-26 17:00 ALTALINK TE 48s RTU/SCADA (48s Pocaterra) RTU configuration update 82 Hours
Daily		  
31-Aug-26 07:00 19-Sep-26 17:00 ALTALINK, DOW RB 787L (166s Dow Chemical Fort Saskatchewan - 787AL tap), 787L (71s Lamoureux - 787AL tap) urgent repair - transmission line work 466 Hours
Daily		  
31-Aug-26 07:00 04-Sep-26 17:00 EPCOR TE Protection & Control (Rossdale) protection blocking, breaker fail and DFR commissioning and cutovers 106 Hours
Continuous		  
31-Aug-26 07:00 11-Sep-26 15:00 CMH Outage MH-50L (MHS-2 North Industrial - MHS-5 NE Crescent Heights), MHS-2 MH69-221 (MHS-2 North Industrial), MHS-5 MH69-510 (MHS-5 NE Crescent Heights) replace poles & perform line disconnect maintenance on the MH69-50L 272 Hours
Continuous		  
31-Aug-26 07:00 03-Sep-26 17:00 ALTALINK RB 7L230 (69s North Barrhead - 888AL tap) ATCO climbing inspection 82 Hours
Daily		  
31-Aug-26 07:30 31-Aug-26 19:30 ATCO, ALTALINK IO 199L (347s AML Fox Creek - 741s ATC Fox Creek) installing starclamps on conductor of 7L199 between 347s (Fox Creel AL) & 741s Fox Creek 12 Hours
Daily		  
31-Aug-26 08:00 17-Sep-26 16:00 ALTALINK TE 204s RTU/SCADA (204s Sandy Point) RTU configuration updates for 869L - line protection and T1 meter replacement 416 Hours
Daily		  
31-Aug-26 08:00 10-Sep-26 15:00 CMH TE MH-15L (MHS-7 Brier Park - MHS-9 South Saskatchewan) maintenance on the LDR-15L-B 247 Hours
Continuous		  
31-Aug-26 08:00 17-Sep-26 16:00 ALTALINK TE 163s RTU/SCADA (163s Amoco Empress) SCADA configuration changes involving 869L protections 416 Hours
Daily		  
31-Aug-26 08:00 11-Sep-26 16:00 ALTALINK TE 163s Protection & Control (163s Amoco Empress) protection outages required for CVT2 distribution upgrade and circuit cutovers 272 Hours
Daily		  
31-Aug-26 08:00 03-Sep-26 16:00 ENMAX Outage 2.83L (SS-2 - 2.83L tap), 2B138-D90 (SS-2), 2B138-D89 (SS-2), MD97 (SS-2), MD98 (SS-2) install ITBs - 2RLY138-D89-D90 (BMR5) and relay maintenance 80 Hours
Continuous		  
31-Aug-26 08:00 31-Aug-26 16:00 ENMAX Outage 2.81L (SS-2 - SS-9), 9B138-2.81 (SS-9) breaker SF6 gas sample 8 Hours
Continuous		  
31-Aug-26 08:00 01-Sep-26 16:00 ENMAX Outage 15.62L (SS-15 - SS-16), 15B69-15.62 (SS-15), 16B69-15.62 (SS-16) 15B69-15.62 CT terminal block replacement 32 Hours
Continuous		  
31-Aug-26 08:00 01-Sep-26 16:00 ENMAX TE Protection & Control (SS-15) 15 sub 69 kV Z21 bus differential protection outage, 15B69-15.62 CT terminal block replacement 32 Hours
Daily		  
31-Aug-26 08:00 31-Aug-26 19:00 ATCO, ALTALINK Outage 7L199 (347s AML Fox Creek - 741s ATC Fox Creek), 741s 702 (741s ATC Fox Creek), 347s 199W (347s AML Fox Creek) installing starclamps on conductor of 7L199 between 347s (Fox Creel AL) & 741s Fox Creek 11 Hours
Continuous		  
31-Aug-26 08:00 03-Sep-26 16:00 ALTALINK TE 48s Protection & Control (48s Pocaterra) protection outage to update IP address 80 Hours
Daily		  
31-Aug-26 08:00 03-Sep-26 16:00 ALTALINK TE 48s Protection & Control (48s Pocaterra) outage to power cycle relay after IP address update 80 Hours
Daily		  
31-Aug-26 08:00 03-Sep-26 16:00 ALTALINK TE 48s Protection & Control (48s Pocaterra) protection outage to update IP address 80 Hours
Daily		  
31-Aug-26 08:00 05-Sep-26 16:00 Syncrude Outage 18215 (Syncrude Mildred Lake) Open and rack out circuit breaker 18215 to perform PM work on downstream capacitor bank. 128 Hours
Continuous		  
31-Aug-26 08:00 04-Sep-26 16:00 ALTALINK TE 281s RTU/SCADA (281s Johnson) SCADA configuration updates involving 417L protections 104 Hours
Daily		  
31-Aug-26 08:00 02-Sep-26 16:00 ENMAX Outage 162B138-RB86 (SS-162) relays lockout testing 56 Hours
Continuous		  
31-Aug-26 09:00 31-Aug-26 10:00 ATCO TE ATCO Telecom Equipment, 718s RTU/SCADA (718s Parsons Creek), 820s RTU/SCADA (820s Hangingstone), 933s RTU/SCADA (933s Tower Road), 2014s RTU/SCADA (2014s Halfway) upgrade Ft McMurray tower A SAR to V21, then V22 1 Hour
Continuous		  
31-Aug-26 09:00 31-Aug-26 16:00 ATCO TE ATCO Telecom Equipment BearTrap_S-Telecom, 7750-2 integration, swapping site networking to VPLS 11 7 Hours
Continuous		  
31-Aug-26 09:30 04-Sep-26 17:30 ATCO Outage 801s 902 (801s Anderson) breaker min oil hlr complete testing 104 Hours
Continuous		  
31-Aug-26 10:00 04-Sep-26 17:30 ATCO TE 2029s Protection & Control (2029s Heathfield) 10BL04.07+R1-F873 (12L70) relay firmware upgrade 103.5 Hours
Continuous		  
31-Aug-26 10:00 03-Sep-26 16:00 ATCO Outage 826s 902T (826s Marguerite Lake) transformer maintenance 78 Hours
Continuous		  
31-Aug-26 10:00 03-Sep-26 17:00 ATCO TE 801s Protection & Control (801s Anderson) replace RTXP for 50BF/902 during the 902 breaker outage 79 Hours
Continuous		  
31-Aug-26 10:00 03-Sep-26 17:00 ATCO, ALTALINK RB 7L230 (743s Sarah Lake - 888AL tap) climbing inspection on 7L230 79 Hours
Continuous		  
31-Aug-26 11:00 03-Sep-26 17:00 ALTALINK Outage 942L (71s Lamoureux - 681s Bannerman), 71s 1752 (71s Lamoureux), 71s 1652 (71s Lamoureux), 71s 942 (71s Lamoureux) Switch replacement 71s942
Switch repair 71s49, 71s50		 78 Hours
Continuous		  
31-Aug-26 11:00 03-Sep-26 17:00 ALTALINK, EPCOR RB 920L (71s Lamoureux - 557s Castle Downs) 920LE at 557s Castle Downs - Altalink working on 71s Lamoureux 78 Hours
Continuous		  
31-Aug-26 11:30 31-Aug-26 13:30 ALTALINK Outage 38s C1 (38s East Edmonton) cap bank weed spraying 2 Hours
Daily		  
31-Aug-26 12:30 03-Sep-26 13:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) installing interphase spacers on 7L760 live line
73 Hours
Continuous		  
31-Aug-26 13:00 03-Sep-26 13:00 ATCO Outage 791s 701T (791s Rainbow Lake), 791s 706 (791s Rainbow Lake) transformer testing 72 Hours
Continuous		  
31-Aug-26 13:00 03-Sep-26 16:00 ALTALINK TE 227s RTU/SCADA (227s Cutting Lake) install new HMI at 227s 75 Hours
Daily		  
31-Aug-26 13:00 06-Oct-26 07:30 ATCO TE 790s Protection & Control (790s Poplar Hill), 790s RTU/SCADA (790s Poplar Hill) wire new breaker 508, 508 feeder protection into the station RTU and 701T protection 858.5 Hours
Continuous		  
31-Aug-26 13:30 31-Aug-26 15:30 ALTALINK Outage 38s C2 (38s East Edmonton) cap bank weed spraying 2 Hours
Daily		  
01-Sep-26 07:00 02-Sep-26 17:00 ALTALINK Outage 216s T2 (216s Knightsbridge) T2 full meter upgrade 34 Hours
Continuous		  
01-Sep-26 07:00 01-Sep-26 19:00 ALTALINK Outage 216s T1 (216s Knightsbridge) 216s8 switch hot spot repair, 216s11 fused disconnect replacement, switch maintenance on T1 4.16 kV bus 12 Hours
Daily		  
01-Sep-26 07:30 03-Sep-26 16:30 ATCO, ALTALINK RB 199L (347s AML Fox Creek - 741s ATC Fox Creek) 14 red tag pole change program 171 Hours
Continuous		  
01-Sep-26 08:00 03-Sep-26 16:00 ATCO, ALTALINK RB 7L199 (347s AML Fox Creek - 741s ATC Fox Creek) 14 red tag pole change program 170 Hours
Continuous		  
01-Sep-26 08:00 01-Sep-26 10:00 ENMAX Outage 1.80L (SS-1 - SS-28), 28B138-1.80 (SS-28) fall transmission pothead washing 2 Hours
Continuous		  
01-Sep-26 08:00 01-Sep-26 16:00 ENMAX RB 31.84L (SS-31 - SS-32) fall transmission line washing 8 Hours
Continuous		  
01-Sep-26 08:00 02-Sep-26 11:30 ALTALINK Outage 650s 252 (650s Hansman Lake) adding a maintenance switch to 650s252 27.5 Hours
Continuous		  
01-Sep-26 08:00 01-Sep-26 16:00 ENMAX Outage 2.83L (SS-5 - 2.83L tap), 5B138-2.83 (SS-5) HV breaker maintenance 8 Hours
Continuous		  
01-Sep-26 08:00 01-Sep-26 16:00 ALTALINK TE 103s Protection & Control (103s Goose Lake) salvage 893L RAS, 893L (L12) line protection 8 Hours
Continuous		  
01-Sep-26 08:00 04-Sep-26 20:00 SUNCOR TE 29EDD-1 29EDD1s1252 (29EDD-1 Millennium), 29EDD-1 29EDD1s1352 (29EDD-1 Millennium) PRC-005 29EDD1S1252/1352 relay testing, 29CVT - 6/6L32 system, 6L32 is required to stay energized
 84 Hours
Continuous		  
01-Sep-26 08:00 02-Sep-26 16:00 ALTALINK TE 216s RTU/SCADA (216s Knightsbridge) update configuration for T2 revenue meter replacement 32 Hours
Daily		  
01-Sep-26 08:00 01-Sep-26 16:00 ALTALINK TE 268s RTU/SCADA (268s Whitecourt), AltaLink Telecom Equipment MPLS 7705 nodes firmware upgrade.
Affects 526L/6L126 one channel at a time with redundant protection in service.
797L A and B TPR will be OOS. 		8 Hours
Daily		  
01-Sep-26 08:00 01-Sep-26 16:00 ATCO, ALTALINK TE 12L41 (510s Sunnybrook - 939s Livock), ATCO Telecom Equipment firmware upgrade to aviat radio (Fawcett - Brintnell) 8 Hours
Continuous		  
01-Sep-26 08:00 01-Sep-26 16:00 ENMAX TE Protection & Control (SS-5) 5 sub zone 31 bus differential protection outage, 5 sub 25 kV switchgear addition 8 Hours
Daily		  
01-Sep-26 08:30 01-Sep-26 17:00 ALTALINK Outage 17s 4 (17s Benalto) PRC5 breaker maintenance and first trip 8.5 Hours
Daily		  
01-Sep-26 09:00 02-Sep-26 16:00 ATCO TE 951s Protection & Control (951s Thickwood Hills), 951s RTU/SCADA (951s Thickwood Hills) configuration changes 951s 240 kV and SVC 31 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 11:00 ATCO TE ATCO Telecom Equipment, 813s RTU/SCADA (813s Little Smoky), 734s RTU/SCADA (734s Sturgeon), 845s Protection & Control (845s Big Mountain) 813S net 11 and 'A' SAR TO V21, the V22
2 outages, impact up to 1 hour each
 2 Hours
Continuous		  
01-Sep-26 09:00 02-Sep-26 17:00 ATCO TE ATCO Telecom Equipment new SAR A, SDI cards 1.3/1.4 slots, cut over Sept 2 between 10am-2pm 32 Hours
Continuous		  
01-Sep-26 09:00 03-Sep-26 17:30 ATCO, ALTALINK Outage 9L961 (13s Deerland - 825s Whitefish Lake) 9L961L structure 3 replace synthetic insulators, pins and cotter keys 56.5 Hours
Continuous		  
01-Sep-26 09:00 03-Sep-26 17:30 ATCO, ALTALINK RB 9L960 (13s Deerland - 825s Whitefish Lake) 9L961L3 change synthetic insulators, pins and cotter keys 56.5 Hours
Daily		  
01-Sep-26 09:00 03-Sep-26 17:30 ATCO, ALTALINK IO 9L961 (13s Deerland - 825s Whitefish Lake) AltaLink outage to replace insulators
56.5 Hours
Continuous		  
01-Sep-26 09:00 03-Sep-26 17:30 ATCO, ALTALINK RB 9L960 (13s Deerland - 825s Whitefish Lake) Altalink requesting reclosing off to replace insulators on 9L961
56.5 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 2033s RTU/SCADA (2033s Mowat) configuration update on 1 ION meter, provides substation 500PT1 KV and frequency analog values to the AESO, less than 5 minutes to restart 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 2091s RTU/SCADA (2091s Thornton) configuration change on 1 ION meter 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 722s RTU/SCADA (722s Crystal Lake) configuration change on 2 ION meters 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 733s RTU/SCADA (733s Simonette) configuration change on 1 ION meter 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 749s Flyingshot Lake RTU/SCADA configuration change on 2 ION meters 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 754s RTU/SCADA (754s Ksituan River) configuration change on 2 ION meters 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 794s RTU/SCADA (794s Valleyview) configuration change on 2 ION meters 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 808s RTU/SCADA (808s Procter & Gamble) configuration update on 2 ION meters, provides the substation 400PT1 KV, 701T LV MW, 701T LV MVAR, frequency, 400PT2 KV, 702T LV MW and 702T LV MVAR analog values that are sent to AESO, less than 5 minutes to restart. 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 810s RTU/SCADA (810s Dome Cutbank) configuration change on 1 ION meter 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 815s RTU/SCADA (815s Goodfare) configuration update 1 ION meter 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 823s RTU/SCADA (823s Wapiti) configuration update on 1 ION meter 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 886s RTU/SCADA (886s Updike) configuration change on 1 ION meter 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 734s RTU/SCADA (734s Sturgeon) configuration change on 1 ION meter 8 Hours
Continuous		  
01-Sep-26 09:00 01-Sep-26 17:00 ATCO TE 845s RTU/SCADA (845s Big Mountain) configuration change on 1 ION meter 8 Hours
Continuous		  
01-Sep-26 10:00 04-Sep-26 14:00 ATCO Outage 827s 702T (827s Cranberry Lake), 827s 702 (827s Cranberry Lake) transformer class 2 tap changer 702T at 827s, breaker SF6 ltb145D1/B complete testing 702 at 827s 76 Hours
Continuous		  
01-Sep-26 10:01 01-Sep-26 11:00 ENMAX Outage 1.81L (SS-1 - SS-20) fall transmission pothead washing 0.98 Hours
Continuous		  
01-Sep-26 11:01 01-Sep-26 13:00 ENMAX Outage 9.83L (SS-9 - SS-43) fall transmission pothead washing 1.98 Hours
Continuous		  
01-Sep-26 12:00 02-Sep-26 17:00 ATCO RB 7L121 (2043s Freer - 7LA121 tap) installing aerial markers on 7L121 at str spans 88, 126, 371 29 Hours
Continuous		  
01-Sep-26 13:01 01-Sep-26 16:00 ENMAX Outage 33.84L (SS-33 - SS-43) fall transmission pothead washing 2.98 Hours
Continuous		  
02-Sep-26 07:00 03-Sep-26 18:00 ALTALINK, BCH RB 1201L (520s Bennett - BCH Cranbrook) conductor inspection on structure 21-22, 50-51, 187-188, 279-280 35 Hours
Continuous		  
02-Sep-26 07:00 21-Oct-26 15:00 ALTALINK, TRANSALTA Outage 320p GT3 (320p Keephills), 320p 3052 (320p Keephills), 320p 2952 (320p Keephills) maintenance 1,184 Hours
Continuous		  
02-Sep-26 08:00 02-Sep-26 18:00 Syncrude TE Syncrude ICCP Outage SCADA - server update 10 Hours
Daily		  
02-Sep-26 08:00 02-Sep-26 20:00 SUNCOR TE 29PL9-15 (29EDD-34 - 29EDD-56) 29PL9-15 (PML7550) comm failure require meter replacement 12 Hours
Continuous		  
02-Sep-26 08:00 02-Sep-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 64s RTU/SCADA (64s East Crossfield) replacing loose cards on shelf, software upgrade of radio hop can be performed at the same time 8 Hours
Continuous		  
02-Sep-26 08:00 02-Sep-26 16:00 ENMAX RB 11.82L (SS-11 - SS-14) fall transmission line washing 8 Hours
Continuous		  
02-Sep-26 08:00 02-Sep-26 16:00 ENMAX Outage 5B138-5BT7 (SS-5) HV breaker maintenance 8 Hours
Continuous		  
02-Sep-26 08:00 03-Sep-26 16:00 ENMAX Outage 16.60L (SS-16 - SS-34), 16B69-16.60 (SS-16), 34B69-16.60 (SS-34) 16B69-16.60 CT terminal block replacement 32 Hours
Continuous		  
02-Sep-26 08:00 03-Sep-26 16:00 ENMAX TE Protection & Control (SS-16) 16 sub Z21 69 kV bus differential protection outage 32 Hours
Daily		  
02-Sep-26 08:00 02-Sep-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 338s RTU/SCADA (338s Cherhill) MPLS 7705 nodes firmware upgrade 8 Hours
Daily		  
02-Sep-26 08:00 03-Sep-26 16:00 ALTALINK TE 288s Protection & Control (288s Wolf Creek) standard relay maintenance 32 Hours
Daily		  
02-Sep-26 08:30 02-Sep-26 17:00 ATCO TE 898s Heart Lake RTU/SCADA automation and SCADA configuration change 8.5 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 11:00 ATCO TE ATCO Telecom Equipment, 2033s RTU/SCADA (2033s Mowat) upgrading Codesa 'A' SAR, and Mowat 'A' SAR OS to V21, then V22 2 Hours
Continuous		  
02-Sep-26 09:00 21-Sep-26 13:00 BCH Outage 5L96 (BCH Selkirk - BCH Vaseux Lake) maintenance, BC maintenance does not affect the Alberta ATC 460 Hours
Continuous		 AB-BC
02-Sep-26 09:00 03-Sep-26 16:00 ALTALINK TE 12s Protection & Control (12s Heartland) ATCO requested 12L70 line protection testing 31 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 786s RTU/SCADA (786s High Level) configuration change on 2 ION meters 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE ATC 793s RTU/SCADA (ATC 793s West Peace River) configuration change on 2 ION meters 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 800s RTU/SCADA (800s Friedenstal) configuration change on 1 ION meter 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 812s RTU/SCADA (812s Norcen) configuration change on 1 ION meter 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 828s RTU/SCADA (828s Sulphur Point) configuration change on 1 ION meter 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 829s RTU/SCADA (829s Boucher Creek) configuration change on 1 ION meter 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 832s RTU/SCADA (832s Blumenort) configuration change on 2 ION meters 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 855s RTU/SCADA (855s Hamburg) configuration change on 1 ION meter 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 861s RTU/SCADA (861s Eureka River) configuration change on 1 ION meter 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 869s RTU/SCADA (869s Seal Lake) configuration change on 2 ION meters 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 927s RTU/SCADA (927s Buchanan Creek) configuration change on 1 ION meter 8 Hours
Continuous		  
02-Sep-26 09:00 02-Sep-26 17:00 ATCO TE 834s RTU/SCADA (834s Wesley Creek) configuration change on 4 ION Meters 8 Hours
Continuous		  
02-Sep-26 12:30 03-Sep-26 14:00 ALTALINK Outage 650s 352 (650s Hansman Lake) adding a maintenance switch to 650s352 25.5 Hours
Continuous		  
03-Sep-26 07:00 03-Sep-26 17:00 EPCOR Outage 987s C2405 (987s Clover Bar) Cloverbar - C2405 capacitor nameplate pictures 10 Hours
Continuous		  
03-Sep-26 08:00 12-Sep-26 16:00 ALTALINK TE 388s RTU/SCADA (388s Riverside) complete SCADA upgrade 224 Hours
Daily		  
03-Sep-26 08:00 03-Sep-26 17:30 ALTALINK Outage 156L (19s Wabamun - 156BL tap), 19s 156 (19s Wabamun) 156L36 Structure replacement 9.5 Hours
Continuous		  
03-Sep-26 08:00 03-Sep-26 16:00 ENMAX RB 14.83L (SS-14 - SS-36) fall transmission line washing 8 Hours
Continuous		  
03-Sep-26 08:00 03-Sep-26 16:00 ENMAX RB 38.83L (SS-38 - SS-39) fall transmission line washing 8 Hours
Continuous		  
03-Sep-26 08:00 03-Sep-26 16:00 ENMAX RB 39.82L (SS-39 - SS-162) fall transmission line washing 8 Hours
Continuous		  
03-Sep-26 08:00 03-Sep-26 10:00 ATCO RB 7L16 (766s Nevis - 948s Heatburg) tap up 2000s to 7L16 2 Hours
Continuous		  
03-Sep-26 08:00 05-Sep-26 19:00 ATCO RB 9L58 (848s Ruth Lake - 888s Dover) tower line inspection 9L58/9L74 59 Hours
Continuous		  
03-Sep-26 08:00 05-Sep-26 19:00 ATCO RB 9L01 (848s Ruth Lake - 951s Thickwood Hills) tower line inspection 9L74/58 59 Hours
Continuous		  
03-Sep-26 08:00 05-Sep-26 19:00 ATCO RB 9L74 (888s Dover - 960s Birchwood Creek) tower line inspection 9L74/58 59 Hours
Continuous		  
03-Sep-26 08:00 04-Sep-26 19:00 ATCO RB 9L39 (925s Green Stocking - 934s Blackfly) tower line inspection 9L77/9L39 35 Hours
Continuous		  
03-Sep-26 08:00 04-Sep-26 19:00 ATCO RB 9L77 (925s Green Stocking - 934s Blackfly) tower line inspection 9L77/9L39 35 Hours
Continuous		  
03-Sep-26 08:00 03-Sep-26 12:00 ENMAX Outage 65B240-D134 (SS-65) breaker SF6 gas sample - 65B240-D134 4 Hours
Continuous		  
03-Sep-26 08:00 03-Sep-26 16:00 ALTALINK TE 103s Protection & Control (103s Goose Lake) implement fault reporting on line protections 613L B87/21/L9 URL90 8 Hours
Continuous		  
03-Sep-26 08:00 03-Sep-26 16:00 ALTALINK TE AltaLink Telecom Equipment 9273R Springbank radio to 9286R Cochrane Lake radio repair 8 Hours
Daily		  
03-Sep-26 08:00 03-Sep-26 16:00 ALTALINK TE 230s RTU/SCADA (230s Wardlow), AltaLink Telecom Equipment upgrading radio hop between 230s Wardlow and 9275R Jenner 8 Hours
Daily		  
03-Sep-26 08:00 08-Sep-26 18:00 SUNCOR Outage 635PL7-1000 (635EDD-1000 - 635EDD-1001), 635EDD-1000 635-752-111 (635EDD-1000), 635EDD-1000 635-752-112 (635EDD-1000), 635EDD-1000 635PS-1036 (635EDD-1000) planned maintenance of 144 kV breakers 752-111 and 752-112, associated protection and control testing 130 Hours
Continuous		  
03-Sep-26 08:00 03-Sep-26 16:00 ENMAX TE Protection & Control (SS-162) relays, lockout testing 162RLY138C60-13 8 Hours
Continuous		  
03-Sep-26 09:00 04-Sep-26 16:00 ATCO TE 951s Protection & Control (951s Thickwood Hills), 951s RTU/SCADA (951s Thickwood Hills) configuration change 31 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 11:00 ATCO TE ATCO Telecom Equipment, 2009s RTU/SCADA (2009s Willow Lake), 977s RTU/SCADA (977s Salt Creek) upgrade SALT CREEK 'A' and NET 11 SAR OS TO V21, then V22 2 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ALTALINK Outage 535s 6352 (535s Joffre) replace 535s6352 failing tank heaters 8 Hours
Daily		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 720s RTU/SCADA (720s Wabasca) configuration change on 1 ION meter 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 729s RTU/SCADA (729s Otauwau) configuration change on 2 ION meters 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 732s RTU/SCADA (732s Mitsue) configuration change on 4 ION meters 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 735s RTU/SCADA (735s Swan River) configuration change on 1 ION meter 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 738s RTU/SCADA (738s Virginia Hills) configuration change on 1 ION meter 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 743s RTU/SCADA (743s Sarah Lake) configuration change on 1 ION meter
8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 745s RTU/SCADA (745s Slave Lake) configuration change on 1 ION meter 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 787s RTU/SCADA (787s High Prairie) configuration change on 2 ION meters 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 851s RTU/SCADA (851s Morse River) configuration change on 1 ION meter 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 876s RTU/SCADA (876s Brintnell) configuration change on 4 ION meters 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 950s RTU/SCADA (950s Germain) configuration change on 1 ION meter 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 17:00 ATCO TE 824s RTU/SCADA (824s Fieldgate) configuration change on 1 ION mete 8 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 16:00 ATCO TE ATCO Telecom Equipment Highland_S-Telecom- 7750-2 integration, swapping site networking to VPLS 11 7 Hours
Continuous		  
03-Sep-26 09:00 03-Sep-26 16:00 ATCO TE ATCO Telecom Equipment Germain_T-Telecom- 7750-2 integration, swapping site networking to VPLS 11 7 Hours
Continuous		  
03-Sep-26 10:00 03-Sep-26 12:00 ALTALINK TE AltaLink Telecom Equipment update configuration 2 Hours
Continuous		  
03-Sep-26 12:01 03-Sep-26 16:00 ENMAX Outage 65B240-D135 (SS-65) breaker SF6 gas sample - 65B240-D135 3.98 Hours
Continuous		  
04-Sep-26 07:00 04-Sep-26 18:00 ALTALINK Outage 706L (54s Fort Saskatchewan - 706AL tap), 54s 706N (54s Fort Saskatchewan) high load move on 706L crossing under structures 46-47 11 Hours
Daily		  
04-Sep-26 07:30 04-Sep-26 17:00 ALTALINK, EPCOR RB 930L (37s North Calder - Poundmaker) aerial washing program 9.5 Hours
Continuous		  
04-Sep-26 07:30 12-Sep-26 09:29 ALTALINK Outage 77s 552 (77s Sagitawah) protection upgrade 77s552 193.98 Hours
Continuous		  
04-Sep-26 08:00 06-Sep-26 18:00 SUNCOR Outage 29PL7-10 (29EDD-18 Firebag - 29EDD-85), 29EDD-85 752-10010 (29EDD-85), 29EDD-85 752-10030 (29EDD-85), 29EDD-85 29PS-319 (29EDD-85) 29PL7-10 line repairs 58 Hours
Continuous		  
04-Sep-26 09:00 04-Sep-26 16:00 ATCO, CNRL TE 838s Protection & Control (838s Horizon Mining), 838s RTU/SCADA (838s Horizon Mining)
configuration changes		 7 Hours
Continuous		  
04-Sep-26 09:00 04-Sep-26 13:00 ATCO Outage 7L68 (730s Rycroft - 811s Clairmont Lake), 811s 707 (811s Clairmont Lake), 730s 704 (730s Rycroft) emergency outage to repair structures 508 and 509 4 Hours
Continuous		  
04-Sep-26 10:00 04-Sep-26 12:59 SUNCOR Outage 29EDD-1 29EDD1s1252 (29EDD-1 Millennium) PRC-005 trip testing, keeping 6L32 online

 2.98 Hours
Continuous		  
04-Sep-26 13:00 04-Sep-26 16:00 SUNCOR Outage 29EDD-1 29EDD1s1352 (29EDD-1 Millennium) PRC-005 trip testing, keeping 6L32 online 3 Hours
Continuous		  

Prepared On:   2026-08-26   15:40:21

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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