Alberta Electric System Operator
System Co-ordination Plan
2026-08-13 to 2026-08-21
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 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 18-Aug-26 17:00 ALTALINK Outage 526s C1 (526s Buffalo Creek) forced outage 1,991 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 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 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		  
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 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 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 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 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 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		  
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 23-Aug-26 16:00 ENMAX, ALTALINK Outage 24.83L (74s Janet - SS-24), 74s 24.83X (74s Janet) wood pole installation 416 Hours
Continuous		  
04-Aug-26 08:00 24-Aug-26 16:00 ALTALINK, ENMAX IO 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 19:01 17-Aug-26 11:00 BCH Outage 5CB9 (BCH Selkirk), 5CB8 (BCH Selkirk) replace 5PT9, 5L91 remains in service 303.98 Hours
Continuous		 AB-BC
04-Aug-26 19:01 17-Aug-26 11:00 BCH RB 5L91 (BCH Ashton Creek - BCH Selkirk) 5L91 AR turned off 303.98 Hours
Continuous		 AB-BC
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 13:00 05-Sep-26 13:00 ATCO TE 2085s Protection & Control (2085s Sheridan) power quality meter install at 2085s Sheridan
 744 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		  
08-Aug-26 08:00 18-Aug-26 16:00 Syncrude Outage MH1 (Aurora - Aurora), 24 (Aurora), 23 (Aurora) zone 11 6yr preventative maintenance 248 Hours
Continuous		  
08-Aug-26 08:00 13-Aug-26 20:00 SUNCOR TE 29EDD-1 29EDD1s1852 (29EDD-1 Millennium), 29EDD-1 29EDD1S1452 (29EDD-1 Millennium) PRC-005 relay testing 132 Hours
Continuous		  
09-Aug-26 07:00 13-Aug-26 17:00 ALTALINK IO 77s 38 (77s Sagitawah) test protection functionality 106 Hours
Continuous		  
10-Aug-26 07:00 16-Aug-26 17:00 EPCOR Outage 665s T3 (665s Dome), 665s D721 (665s Dome), 665s D2404 (665s Dome), S721 (Strathcona) Dome TX3 and disconnect maintenance 154 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		  
10-Aug-26 08:00 13-Aug-26 16:00 ALTALINK TE 95s RTU/SCADA (95s Imperial Oil Edmonton), AltaLink Telecom Equipment MPLS 95S-7705B addition, and 95S-7705A upgrade 80 Hours
Continuous		  
10-Aug-26 08:00 13-Aug-26 16:00 ALTALINK TE AltaLink Telecom Equipment MPLS 9095R-7705B addition, 9095R-7705A upgrade 80 Hours
Continuous		  
10-Aug-26 08:00 17-Aug-26 16:00 ENMAX Outage 37.81L (SS-37 - SS-38), 37B138-37.81 (SS-37), 38B138-37.81 (SS-38) siding work near line 176 Hours
Continuous		  
10-Aug-26 08:00 13-Aug-26 16:00 ATCO TE 969s Protection & Control (969s Lindbergh) settings changes to 50BF/701, 67-67N-32-59/5L767, SPS/969 80 Hours
Continuous		  
10-Aug-26 08:00 14-Aug-26 16:00 ALTALINK TE 395s RTU/SCADA (395s North Holden) update RTU/HMI configuration 104 Hours
Daily		  
10-Aug-26 09:00 13-Aug-26 16:00 ATCO Outage 7LA53 (969s Lindbergh - 7L53 tap), 969s 701T (969s Lindbergh), 969s 501 (969s Lindbergh), 969s 701 (969s Lindbergh), 969s 301 (969s Lindbergh) total station outage at 969s 79 Hours
Continuous		  
10-Aug-26 09:00 09-Oct-26 10:00 ALTALINK Outage 58s T1 (58s Edson) 58s T1 transformer replacement and containment install 1,177 Hours
Continuous		  
10-Aug-26 10:00 14-Aug-26 17:30 ATCO Outage 959s SVC (959s Lanfine), 959s 921 (959s Lanfine) SVC transformer maintenance

103.5 Hours
Continuous		  
10-Aug-26 10:00 20-Aug-26 17:30 ATCO TE 2029s Protection & Control (2029s Heathfield) relay firmware upgrade 247.5 Hours
Continuous		  
10-Aug-26 10:00 13-Aug-26 16:00 ALTALINK TE 245s Protection & Control (245s Seebe) Techs to temporary disable A87/138BN and B87/138BN Bus protections for approx 1hr to block at the beginning & end of the outage for 245s754W CT replacement. Protections are redundant. 11(96/25SC)/652, 754L A21/79/L7 & 754L B21/L7 will be out of service for the duration of the outage. 78 Hours
Continuous		  
10-Aug-26 10:00 13-Aug-26 16:00 ALTALINK TE 186s RTU/SCADA (186s Dry Creek) supervisory outage to upgrade meter modules 78 Hours
Continuous		  
10-Aug-26 11:00 13-Aug-26 16:30 ALTALINK Outage 71s 138kV West Bus (71s Lamoureux), 71s T1 (71s Lamoureux), 71s 152 (71s Lamoureux), 71s 552 (71s Lamoureux), 71s C1 (71s Lamoureux), 71s C2 (71s Lamoureux) transformer maintenance, switch maintenance, breaker maintenance 77.5 Hours
Continuous		  
10-Aug-26 12:00 13-Aug-26 18:00 ALTALINK Outage 754L (245s Seebe - 742L tap), 245s 754W (245s Seebe) 245s754W CT replacement 78 Hours
Continuous		  
10-Aug-26 12:30 13-Aug-26 17:00 ALTALINK Outage 17s 85 (17s Benalto), 17s T2 (17s Benalto) 17s85 CT replacement 76.5 Hours
Continuous		  
10-Aug-26 13:00 13-Aug-26 13:00 ATCO TE 939s Protection & Control (939s Livock), 939s RTU/SCADA (939s Livock) CIP update password at 939S 72 Hours
Continuous		  
10-Aug-26 23:52 14-Aug-26 17:00 ATCO Outage 7L171 (802s Michichi Creek - 804s Wintering Hills), 802s 706 (802s Michichi Creek), 804s 701 (804s Wintering Hills) forced outage 89.13 Hours
Continuous		  
11-Aug-26 07:00 13-Aug-26 18:00 ALTALINK Outage 310p 1852 (310p Sundance) replace 310p1852 CT's 59 Hours
Continuous		  
11-Aug-26 07:00 13-Aug-26 18:00 ALTALINK TE 310p Protection & Control (310p Sundance) isolate protections for CT1852 testing, restore protections daily 59 Hours
Daily		  
11-Aug-26 07:15 16-Aug-26 16:45 ALTALINK Outage 790L (434s Stony Plain - 790AL tap), 434s 790 (434s Stony Plain) LOA for old 434s T3 transformer removal 129.5 Hours
Continuous		  
11-Aug-26 10:00 24-Aug-26 16:00 ATCO Outage 6L96 (735s Swan River - 743s Sarah Lake), 743s 604 (743s Sarah Lake), 735s 604 (735s Swan River) 743S sarah lake rebuild, replace breaker 604 318 Hours
Continuous		  
12-Aug-26 07:00 16-Aug-26 17:00 EPCOR Outage T1 (Meadowlark), 72JM18 (EP 805s Jasper - Meadowlark), M722 (Meadowlark), M721 (Meadowlark), MAB1 (Meadowlark), EP 805s J722 (EP 805s Jasper) TX1zone, LCR civil work 106 Hours
Continuous		  
12-Aug-26 08:00 13-Aug-26 16:00 ALTALINK TE AltaLink Telecom Equipment MPLS maintenance 32 Hours
Daily		  
12-Aug-26 09:00 13-Aug-26 17:00 ATCO TE 2075s Protection & Control (2075s Newell) replace failed 900BS2 relay 32 Hours
Continuous		  
13-Aug-26 06:00 18-Aug-26 18:00 SUNCOR Outage 635EDD-1000 635PK-1001 (635EDD-1000), 635EDD-1000 635-752-161 (635EDD-1000), 635EDD-1000 635-752-162 (635EDD-1000), 635EDD-1000 635PS-1044 (635EDD-1000) planned maintenance of diameter 132 Hours
Continuous		  
13-Aug-26 07:00 13-Aug-26 11:30 EPCOR Outage 987s CS2 (987s Clover Bar), 987s SST2 (987s Clover Bar) bus diff upgrade cutovers 4.5 Hours
Continuous		  
13-Aug-26 07:00 13-Aug-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) breaker fail protection outage (77s652) for trip testing, no redundancy 10 Hours
Daily		  
13-Aug-26 08:00 13-Aug-26 16:00 ALTALINK TE 356s Protection & Control (356s Milo) 927L settings changes for metering updates 8 Hours
Daily		  
13-Aug-26 08:00 13-Aug-26 16:00 ALTALINK TE 356s RTU/SCADA (356s Milo) configuration updates for L4 protection metering updates 8 Hours
Daily		  
13-Aug-26 08:00 13-Aug-26 16:00 ENMAX TE Protection & Control (SS-3) 138 kV bus differential protection, lockout relay protection outage, relay protection test 8 Hours
Continuous		  
13-Aug-26 08:31 13-Aug-26 17:30 ALTALINK Outage 77s 552 (77s Sagitawah) trip test 77s552 8.98 Hours
Continuous		  
13-Aug-26 09:30 14-Aug-26 16:00 ATCO TE ATCO Telecom Equipment, 840s RTU/SCADA (840s McNeill Station) moving communication and Scada traffic onto new star link device
30.5 Hours
Continuous		  
13-Aug-26 10:00 13-Aug-26 12:59 SUNCOR Outage 29EDD-1 29EDD1s1852 (29EDD-1 Millennium) PRC-00, relay testing 2.98 Hours
Continuous		  
13-Aug-26 10:00 13-Aug-26 16:00 ATCO TE 977s Protection & Control (977s Salt Creek) troubleshoot communication to 901T ground current monitoring device 6 Hours
Continuous		  
13-Aug-26 12:00 13-Aug-26 16:00 ALTALINK TE 395s RTU/SCADA (395s North Holden), AltaLink Telecom Equipment MPLS upgrade 4 Hours
Continuous		  
13-Aug-26 13:00 13-Aug-26 17:00 SUNCOR Outage 29EDD-1 29EDD1S1452 (29EDD-1 Millennium) PRC-005, relay testing 4 Hours
Continuous		  
14-Aug-26 07:00 15-Aug-26 18:00 ALTALINK Outage 720L (347s AML Fox Creek - 397s Benbow), 347s 720X (347s AML Fox Creek), 397s 720N (397s Benbow) urgent, 720L repair existing dead-ends on structure 99 & 99A 35 Hours
Continuous		  
14-Aug-26 08:00 14-Aug-26 12:00 ENMAX Outage 162.3TR (SS-162), 162B138-RB85 (SS-162), 162B138-RB86 (SS-162) summer substation washing 4 Hours
Continuous		  
14-Aug-26 08:00 18-Aug-26 20:00 SUNCOR TE 29EDD-1 29EDD1s1052 (29EDD-1 Millennium), 29EDD-1 29EDD1s852 (29EDD-1 Millennium) 29EDD1/ X260B2 south bus PRC-005 / relay test 84 Hours
Continuous		  
14-Aug-26 09:00 14-Aug-26 11:00 ATCO TE ATCO Telecom Equipment upgrading the Dino park SAR OS to V21, then V22 2 Hours
Continuous		  
14-Aug-26 09:00 15-Aug-26 17:30 ALTALINK Outage 1034L (244s Bowmanton - 324s Cassils) urgent repair 1034L6 OPGW 32.5 Hours
Continuous		  
14-Aug-26 09:00 15-Aug-26 17:30 ATCO, ALTALINK RB 1088L (324s Cassils - 2075s Newell) 1088L proximity R/B For 1034L urgent repair 32.5 Hours
Daily		  
14-Aug-26 09:00 15-Aug-26 17:30 ATCO, ALTALINK RB 9L1088 (324s Cassils - 2075s Newell) AltaLink request: 1034L urgent repair. block reclosers on 1088L @ 2075s 32.5 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		  
14-Aug-26 12:00 21-Aug-26 17:30 ATCO TE 709s Protection & Control (709s Vegreville) 7L65 rebuild - phase 3

173.5 Hours
Continuous		  
14-Aug-26 12:00 14-Aug-26 18:00 ENMAX Outage 162B138-RB92 (SS-162), 162B138-RB94 (SS-162), 162.4TR (SS-162) summer substation washing 6 Hours
Continuous		  
14-Aug-26 17:00 14-Aug-26 19:00 BCH Outage 2L293 (BCH Nelway - BCH Selkirk) instrument transformer replacement project 2 Hours
Continuous		 AB-BC
15-Aug-26 08:00 15-Aug-26 18:00 ENMAX Outage 36.5TR (SS-36), 16B69-16.63 (SS-16), 14.83L (SS-14 - SS-36), 36.2TR (SS-36), 36B138-36BT3 (SS-36) Substation Structure Painting 10 Hours
Continuous		  
15-Aug-26 08:00 15-Aug-26 16:00 ENMAX Outage 16.63L (SS-16 - SS-36), 16B69-16.63 (SS-16) Breaker Power Factor Test - 16B69-16.63 8 Hours
Continuous		  
15-Aug-26 09:00 16-Aug-26 20:00 SUNCOR TE 29EDD-34 29PT-340 (29EDD-34), 29EDD-34 29PT-341 (29EDD-34) 29PT-340 / 29PT-341 re-calibrate 35 Hours
Continuous		  
15-Aug-26 12:00 15-Aug-26 17:00 EPCOR Outage 987s CK726 (987s Clover Bar), 72CK13 (987s Clover Bar - Kennedale) Cloverbar: CK726, BUS Diff Upgrade Cutovers 5 Hours
Continuous		  
16-Aug-26 07:00 18-Aug-26 17:00 ALTALINK TE 254s Protection & Control (254s Coaldale) modify the communication settings 58 Hours
Daily		  
16-Aug-26 08:00 16-Aug-26 18:00 ENMAX Outage 7.84L (SS-7 - SS-36), 36B138-36BT3 (SS-36), 36.1TR (SS-36), 36.3TR (SS-36), 36B138-36.81 (SS-36) Substation Structure Painting 10 Hours
Continuous		  
16-Aug-26 08:00 16-Aug-26 18:00 ENMAX, ALTALINK IO 36.81L (44s Bearspaw Plant - SS-36) ENMAX - Substation Structure Painting 10 Hours
Continuous		  
16-Aug-26 08:00 18-Aug-26 16:00 ALTALINK TE 254s Protection & Control (254s Coaldale), 254s RTU/SCADA (254s Coaldale) Loss of ACC visibility for up to 5 minutes to fix remote access issue with 172LE, 172LW and 820L SEL-311C relays. Supervisory outage will be returned EOD, everyday 56 Hours
Daily		  
17-Aug-26 07:00 23-Aug-26 17:00 EPCOR Outage T2 (EP Hardisty), H722 (EP Hardisty), H723 (EP Hardisty), H726 (EP Hardisty) Hardisty: TX2/H722 Doble and HAB2/HDS6/HDS7/HDS12 Disconnect Maintenance and H722/H723/H726 (SF6) Breaker Maintenance 154 Hours
Continuous		  
17-Aug-26 07:00 21-Aug-26 18:00 ALTALINK, BCH RB 1201L (520s Bennett - BCH Cranbrook) conductor inspection on STR's 21-22, 50-51, 187-188, 279-280
107 Hours
Continuous		  
17-Aug-26 07:00 23-Aug-26 17:00 EPCOR TE RTU/SCADA (University of Alberta) cutovers and commissioning 154 Hours
Continuous		  
17-Aug-26 07:00 18-Aug-26 17:00 EPCOR Outage 987s T3 (987s Clover Bar), 987s C2407 (987s Clover Bar) relay maintenance 34 Hours
Continuous		  
17-Aug-26 07:00 18-Aug-26 17:00 ALTALINK, EPCOR TE 947L (89s Ellerslie - 987s Clover Bar) protection blocking, MPLS troubleshooting 34 Hours
Continuous		  
17-Aug-26 07:30 21-Aug-26 17:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) HOP required for installing interphase spacers on 7L760 live line 106 Hours
Continuous		  
17-Aug-26 08:00 27-Aug-26 16:00 Syncrude Outage 34 (Aurora), 33B (Aurora), 34A (Aurora), 89-37 (Aurora) Zone 13 6yr PM 248 Hours
Continuous		  
17-Aug-26 08:00 21-Aug-26 17:00 ATCO RB 7L760 (767s Oyen - 7LC760 tap) HOP required for installing interphase spacers on 7L760 live line and installing bird flight diverters on shield wire 105 Hours
Continuous		  
17-Aug-26 08:00 24-Aug-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole replacement from test and treat 176 Hours
Continuous		  
17-Aug-26 08:00 21-Aug-26 16:00 ALTALINK TE 237s Protection & Control (237s Foothills) fault recording implementation 104 Hours
Daily		  
17-Aug-26 08:00 21-Aug-26 16:00 ALTALINK TE 237s RTU/SCADA (237s Foothills) firmware upgrade and configuration changes on the RTU for fault reporting implementation 104 Hours
Daily		  
17-Aug-26 08:00 18-Aug-26 16:00 ENMAX TE Protection & Control (SS-3) 3sub BMR 82 protection outage, relay protection test 32 Hours
Daily		  
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 20-Aug-26 17:00 ALTALINK Outage 310p 1252 (310p Sundance), 310p 1152 (310p Sundance), 310p 11A (310p Sundance), 310p 12B (310p Sundance) replace 310p1152 BKR CT's and repair switch 310p11A 81 Hours
Continuous		  
17-Aug-26 08:00 20-Aug-26 17:00 ALTALINK TE 310p Protection & Control (310p Sundance) CT 1152 testing 81 Hours
Daily		  
17-Aug-26 08:00 20-Aug-26 16:00 ENMAX Outage 3.3TR (SS-3) tap changer inspection, oil leaks 80 Hours
Continuous		  
17-Aug-26 08:00 17-Aug-26 16:00 ENMAX Outage 8.6TR (SS-8) display replacement 8 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 08:00 18-Aug-26 16:00 ENMAX Outage 5.5TR (SS-5) make adjustments on the 5B13-5.5TR breaker due to an alignment/racking issue 32 Hours
Continuous		  
17-Aug-26 08:00 18-Aug-26 16:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) EPCOR requested AML to support EPCOR with 947L B protection comm fail in EPCOR MPLS TPR re-arrangements project 32 Hours
Continuous		  
17-Aug-26 08:00 17-Aug-26 16:00 ALTALINK TE 213s Protection & Control (213s Hughenden) remote settings change on A21/L2 and B21/L2 8 Hours
Continuous		  
17-Aug-26 08:00 19-Aug-26 16:00 ENMAX RB 16.60L (SS-16 - SS-34) tree trimming 56 Hours
Continuous		  
17-Aug-26 08:00 21-Aug-26 16:00 ATCO TE 888s Protection & Control (888s Dover) settings change on 9L43 for Telecom work 1-00524242
104 Hours
Continuous		  
17-Aug-26 08:00 19-Aug-26 15:30 CMH Outage MHS-3 MH69-T33 (MHS-3 South Ridge), MHS-3 MH69-314 (MHS-3 Southridge) Transformer protection settings change and functional testing 55.5 Hours
Continuous		  
17-Aug-26 08:00 17-Aug-26 12:00 ENMAX Outage 65B138-D81 (SS-65) HV Breaker SF6 Gas Sample - 65B138-D81 4 Hours
Continuous		  
17-Aug-26 09:00 17-Aug-26 10:00 ATCO TE ATCO Telecom Equipment upgrading the Nevis sub net 11 SAR TO V21, THEN V21 1 Hour
Continuous		  
17-Aug-26 09:00 17-Aug-26 15:00 ATCO TE 802s 702T (802s Michichi Creek), 802s 703T (802s Michichi Creek), 802s Protection & Control (802s Michichi Creek) to mitigate against transformer loss of life, adjustments to the Fan 1 and Fan 2 factory TURN ON temps from 75°C and 85°C to 60 °C and 70 °C respectively for both 702T and 703T at 802S Michichi 6 Hours
Continuous		  
17-Aug-26 09:00 20-Aug-26 17:30 ALTALINK Outage 761L (38s East Edmonton - 71s Lamoureux), 38s 761N (38s East Edmonton) transmission line maintenance 80.5 Hours
Continuous		  
17-Aug-26 09:00 20-Aug-26 20:00 SUNCOR Outage 29EDD-94 29PS-641 (29EDD-94 Voyageur), 29PL9-24 (29EDD-94 Voyageur - 29EDD-60 Inglis Island) 29PS-641 Requires to be realigned as it is not seated correctly while closed. This should be completed in the current outage window of GTG-12 / along with Outage 1-00530435, WO# 300769279 83 Hours
Continuous		  
17-Aug-26 09:30 22-Aug-26 17:00 ALTALINK, EPCOR Outage 920L (71s Lamoureux - 557s Castle Downs), 557s CD2405 (557s Castle Downs), 557s CD2404 (557s Castle Downs), 557s CDDS14 (557s Castle Downs), 557s CDDS8 (557s Castle Downs) CT/CVT doble and surge arrestor LCR 127.5 Hours
Continuous		  
17-Aug-26 09:30 22-Aug-26 17:00 ALTALINK, EPCOR IO 920L (71s Lamoureux - 557s Castle Downs) CT/CVT doble and surge arrestor LCR 127.5 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		  
17-Aug-26 10:00 18-Aug-26 16:00 ATCO Outage 7L47 (718s Parsons Creek - 848s Ruth Lake), 848s 703T (848s Ruth Lake), 718s 701 (718s Parsons Creek), 848s 702 (848s Ruth Lake) breaker maintenance 30 Hours
Continuous		  
17-Aug-26 10:00 18-Aug-26 15:00 ATCO TE 741s RTU/SCADA (741s Fox Creek), 741s Protection & Control (741s Fox Creek) 741S Fox Creek 21B/7L90 deficiency - fixing relay mis-coordination, BMS fail alarm, BMS DNP3 index mismatch - station controller update 29 Hours
Continuous		  
17-Aug-26 10:00 19-Aug-26 17:00 ATCO Outage 813s 708 (813s Little Smoky) breaker SF6 HGF complete testing 55 Hours
Continuous		  
17-Aug-26 11:00 20-Aug-26 16:00 ALTALINK TE 320p Protection & Control (320P Keephills) protection outages required to isolate for 320p652 CT replacement 77 Hours
Continuous		  
17-Aug-26 11:00 20-Aug-26 16:45 ALTALINK Outage 997L (71s Lamoureux - 430s Ursus), 71s T2 (71s Lamoureux), 71s 240kV East Bus (71s Lamoureux), 71s 1752 (71s Lamoureux), 71s 1452 (71s Lamoureux), 71s 1352 (71s Lamoureux), 71s 32 (71s Lamoureux), 71s 997E (71s Lamoureux), 71s 37 (71s Lamoureux), 71s 36 (71s Lamoureux), 71s 47 (71s Lamoureux), 71s 46 (71s Lamoureux) multiple switch repair/replacement and maintenance 71s36, 71s37, 71s46, 71s47 77.75 Hours
Continuous		  
17-Aug-26 11:00 19-Aug-26 19:00 ATCO RB 7L09 (823s Wapiti - 7L03 tap) installing marker cones on span at str 70 56 Hours
Continuous		  
17-Aug-26 11:00 20-Aug-26 16:00 ATCO RB 7L85 (801s Anderson - ATC 803s Bullpound), 7L85 (804s Wintering Hills - 7LA85 tap) installing interphase spacers on 7L85 live line 77 Hours
Continuous		  
17-Aug-26 11:00 20-Aug-26 16:00 ALTALINK TE 245s Protection & Control (245s Seebe) 245s777X CT replacement 77 Hours
Continuous		  
17-Aug-26 11:00 21-Aug-26 17:00 BCH Outage 5L91 (BCH Ashton Creek - BCH Selkirk) end of life insulator replacement 102 Hours
Continuous		 AB-BC
17-Aug-26 11:30 24-Aug-26 14:30 ATCO, ALTALINK RB 199L (347s AML Fox Creek - 741s ATC Fox Creek) 14 red tag pole change program 171 Hours
Continuous		  
17-Aug-26 12:00 20-Aug-26 17:00 ALTALINK Outage 777L (48s Pocaterra - 245s Seebe), 245s 777X (245s Seebe) 245s777X 138kV CT replacement 77 Hours
Continuous		 AB-BC
17-Aug-26 12:00 24-Aug-26 14:00 ATCO, ALTALINK RB 7L199 (347s AML Fox Creek - 741s ATC Fox Creek) 14 red tag pole change program 170 Hours
Continuous		  
17-Aug-26 12:00 20-Aug-26 14:00 ATCO Outage 6L12 (774s Monitor - 6L25 tap), 774s 601 (774s Monitor) structure replacements and deficiency repair 74 Hours
Continuous		  
17-Aug-26 12:00 17-Aug-26 16:00 ENMAX Outage 65B138-D84 (SS-65) HV breaker SF6 gas sample - 65B138-D84 4 Hours
Continuous		  
17-Aug-26 12:30 20-Aug-26 17:00 ALTALINK Outage 320p 652 (320p Keephills) replace 320p652 external CT's 76.5 Hours
Continuous		  
17-Aug-26 13:00 20-Aug-26 13:00 ATCO Outage 9L10 (876s Brintnell - 939s Livock), 939s 903T (939s Livock), 939s 911 (939s Livock), 939s 910 (939s Livock), 939s 904 (939s Livock), 939s 903 (939s Livock), 939s 912 (939s Livock), 939s 910A (939s Livock), 939s 900D1 (939s Livock) PRC-005 - SPR TESTING - TRANSFORMER 903T @ 939S
Repair and adjust 910A @ 939S APL
Repalce OLTC Filters, 903T @ 939S Livock		 72 Hours
Continuous		  
17-Aug-26 13:00 20-Aug-26 13:00 ATCO Outage 828s 702 (828s Sulphur Point) breaker SF6 LTB145D1/B complete testing
72 Hours
Continuous		  
17-Aug-26 14:00 25-Aug-26 17:00 ALTALINK, FORTIS Outage 275s T1 (275s Jenner), 275s 52F1 (275s Jenner), 275s 52F2 (275s Jenner) replace LV bushings, TC Maintenance, copper cutouts 195 Hours
Continuous		  
17-Aug-26 14:00 20-Aug-26 16:30 ALTALINK Outage 574s T1 (574s Nilrem) transformer maintenance 74.5 Hours
Continuous		  
18-Aug-26 07:00 18-Aug-26 18:00 ALTALINK Outage 1112L (89s Ellerslie - 289s Saunders Lake) transmission line maintenance 10.5 Hours
Daily		  
18-Aug-26 07:00 18-Aug-26 18:00 ALTALINK RB 1140L (89s Ellerslie - 289s Saunders Lake) safety requirement for proximity to 1112L 10 Hours
Daily		  
18-Aug-26 07:00 19-Aug-26 20:00 ALTALINK, PR Outage 949L (275s Jenner - 306s Halsbury), 275s 949 (275s Jenner), 306s 240CB1 (306s Halsbury), 306s 240MDS1 (306s Halsbury), 306s 240MDS2 (306s Halsbury), 306s 240MDS3 (306s Halsbury) customer 949L work 37 Hours
Continuous		  
18-Aug-26 07:00 24-Aug-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 21A/6L96 154 Hours
Continuous		  
18-Aug-26 07:30 27-Aug-26 08:30 ALTALINK Outage 77s 752 (77s Sagitawah) protection upgrade 77s752 217 Hours
Continuous		  
18-Aug-26 07:30 18-Aug-26 15:30 ALTALINK Outage 106s 744 (106s Paddle River), 106s T1 (106s Paddle River) customer maintenance 8 Hours
Continuous		  
18-Aug-26 08:00 19-Aug-26 17:00 ALTALINK, FMGW, ATCO Outage 964AL (1024s Granlea - 964L tap), 1024s PT-6001 (1024s Granlea), 1024s PT-6002 (1024s Granlea), 1024s 952-600001 (1024s Granlea), 1024s PS-6005 (1024s Granlea), 1024s PS-6006 (1024s Granlea), 1024s PS-6007 (1024s Granlea), 1024s PS-6008 (1024s Granlea), 1024s 489-600201 (1024s Granlea) maintenance activities (testing and inspection) of electrical equipment 33 Hours
Continuous		  
18-Aug-26 08:00 18-Aug-26 16:00 ENMAX Outage 13.82L (SS-13 - SS-22), 22.1TR (SS-22), 22B138-13.82 (SS-22), 13B138-13.82 (SS-13) maintenance on SW 82 at 22 Sub 8 Hours
Continuous		  
18-Aug-26 08:00 20-Aug-26 16:00 ALTALINK TE 138s Protection & Control (138s Windy Flats) removing for maintenance, 603L, 608L, 1037L, 1038L A & B removed one at a time, redundant protection at all times 56 Hours
Daily		  
18-Aug-26 08:00 18-Aug-26 16:00 ALTALINK TE 332s Protection & Control (332s Ellis) techs to complete standard maintenance on the following redundant protections,784L, T1 A, B & S, T2 A, B & S. 8 Hours
Daily		  
18-Aug-26 08:00 19-Aug-26 19:00 ATCO RB 7L44 (749s Flyingshot Lake - 845s Big Mountain) installing marker cones on span at str 25 35 Hours
Continuous		  
18-Aug-26 08:00 19-Aug-26 17:00 ATCO RB 7L46 (813s Little Smoky - 845s Big Mountain) installing marker cones on 7L45/46 at spans 352, 403, 92 33 Hours
Continuous		  
18-Aug-26 08:00 19-Aug-26 19:00 ATCO RB 7L33 (845s Big Mountain - 7LA33 tap), 7L33 (749s Flyingshot Lake - 7LA33 tap) installing marker cones on span at str 97 35 Hours
Continuous		  
18-Aug-26 08:00 19-Aug-26 19:00 ATCO RB 7L45 (798s Bridge Creek - 813s Little Smoky), 7L45 (798s Bridge Creek - 845s Big Mountain) installing marker cones on span at str 352, 403, 92 35 Hours
Continuous		  
18-Aug-26 08:00 24-Aug-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) blocking 21B/6L96 for relay testing 153 Hours
Continuous		  
18-Aug-26 08:00 24-Aug-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/604 for relay testing 153 Hours
Continuous		  
18-Aug-26 08:00 24-Aug-26 17:00 ATCO TE 743s Protection & Control (743s Sarah Lake) 86-50BF-1/600BS1 and 94-50BF-1/600BS1. 153 Hours
Continuous		  
18-Aug-26 08:00 18-Aug-26 16:00 ALTALINK TE AltaLink Telecom Equipment MPLS node A&B upgrade 8 Hours
Daily		  
18-Aug-26 09:00 18-Aug-26 16:00 ATCO TE ATCO Telecom Equipment, 933s RTU/SCADA (933s Tower Road) Tower Road Telecom outage 7 Hours
Continuous		  
18-Aug-26 09:00 19-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Leak in the IRU radio to Nevis_T waveguide. Checked the inside lines and no leak found, will need a tower crew to check feedline going up the tower and connectors to the feedhorn. link will be down from 10am-2pm on August 19th
Please see the Email sent of May 11 for impacts		 31 Hours
Continuous		  
18-Aug-26 09:00 19-Aug-26 17:00 ATCO TE ATCO Telecom Equipment, 757s RTU/SCADA (757s Battle River) comm pls life cycle upgrades to SAR A
, new SAR A, SDI cards 1.3/1.4 slots

 32 Hours
Continuous		  
18-Aug-26 09:00 18-Aug-26 10:00 ATCO, ALTALINK TE 951s Protection & Control (951s Thickwood Hills), 12L41 (510s Sunnybrook - 939s Livock), 12L44 (939s Livock - 951s Thickwood Hills), 9L01 (848s Ruth Lake - 951s Thickwood Hills), 9L30 (888s Dover - 951s Thickwood Hills), 9L112 (888s Dover - 951s Thickwood Hills), 9L07 (951s Thickwood Hills - 2011s Dawes), ATCO Telecom Equipment Upgrade 951s net sar OS to v21, then v22 impact to following traffic up to 1 hr: 9L74 RAS B (951S / 888S), 12L41 LTO RAS A (951S / 510S), 12L44-21LB1 ALT B (951S / 939S), 9L07B (951S/ 2011S), 9L112 A (951S /888S), 9L30A (951S /888S)
9L01A 951S/ 848S		 1 Hour
Continuous		  
18-Aug-26 09:00 18-Aug-26 14:00 Saskpower Outage Sask Power AS905 maintenance 5 Hours
Continuous		 AB-SK
18-Aug-26 09:30 19-Aug-26 17:30 ATCO, ALTALINK Outage 702L (137s Sedgewick - 757s Battle River), 757s 708 (757s Battle River), 137s 702W (137s Sedgewick) breaker sf6 ltb145D1/B and PRC-005 - trip coil testing, breaker 708 @ 757S 32 Hours
Continuous		  
18-Aug-26 09:30 18-Aug-26 17:30 ALTALINK TE 48s Protection & Control (48s Pocaterra) isolate and test DTT from BC hydro as per their request, protections are not redundant 8 Hours
Continuous		  
18-Aug-26 09:30 18-Aug-26 17:30 ALTALINK, BCH TE 1L274 (BCH Natal - BCH Line Creek tap) NIC RAS PLC PY/SY OOS 8 Hours
Continuous		 AB-BC
18-Aug-26 10:00 18-Aug-26 12:59 SUNCOR Outage 29EDD-1 29EDD1s1052 (29EDD-1 Millennium) 29EDD1 / X260B2 south PRC-005 / relay test -trip open 29EDD1s1052 (29EDD-1 Millennium) - 450338057
In conjunction with Outage 1-00529388
 2.98 Hours
Continuous		  
18-Aug-26 10:00 18-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Green Stocking telecom switch update 6 Hours
Continuous		  
18-Aug-26 13:00 18-Aug-26 17:00 SUNCOR Outage 29EDD-1 29EDD1s852 (29EDD-1 Millennium) 29EDD1 / X260B2 south bus PRC-005 / relay test -trip open 29EDD1s852 (29EDD-1 Millennium) 4 Hours
Continuous		  
19-Aug-26 08:00 20-Aug-26 16:00 ENMAX Outage 13.82L (SS-13 - SS-22), 22B138-13.82 (SS-22), 13B138-13.82 (SS-13) HV Breaker Maintenance. 32 Hours
Continuous		  
19-Aug-26 08:00 22-Aug-26 16:00 ALTALINK TE 38s RTU/SCADA (38s East Edmonton) loss of ACC visibility for up to 10 minutes to replace the failing RTU/HMI-B 80 Hours
Daily		  
19-Aug-26 08:00 20-Aug-26 17:00 ATCO RB 9L05 (809s Louise Creek - 813s Little Smoky) installing marker cones on 9L02/05 at span 345 33 Hours
Continuous		  
19-Aug-26 08:00 20-Aug-26 19:00 ATCO RB 9L02 (809s Louise Creek - 813s Little Smoky) installing marker cones on 9L02/06 span at str 345 35 Hours
Continuous		  
19-Aug-26 08:00 19-Aug-26 16:00 ENMAX TE Protection & Control (SS-33) 33sub Z31 138kV bus differential protection, 86-Z31 lockout relay protection outage, testing 33RLY138-33.Z31 8 Hours
Continuous		  
19-Aug-26 08:00 20-Aug-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 89s RTU/SCADA (89s Ellerslie) upgrade MPLS and firewall 32 Hours
Daily		  
19-Aug-26 08:00 19-Aug-26 16:00 ENMAX TE Protection & Control (SS-41) 41sub BMR-BT3 protection outage, I&R broken ITB on 41BT3-BMR 8 Hours
Continuous		  
19-Aug-26 08:00 19-Aug-26 16:00 ENMAX Outage 41.2TR (SS-41) I&R broken ITB 8 Hours
Continuous		  
19-Aug-26 08:00 20-Aug-26 16:00 ALTALINK TE 62s Protection & Control (62s Brazeau Plant) replace failed protection 32 Hours
Continuous		  
19-Aug-26 09:00 19-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Birchwood-S-Telecom/Dover_T-Telecom, radio major on IRU link Birchwood to Dover Tower, link will be down from 10am-2pm 7 Hours
Continuous		  
19-Aug-26 09:00 19-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Flat Top_T-Telecom- radio major at Flat Top 7 Hours
Continuous		  
19-Aug-26 09:00 20-Aug-26 16:00 ALTALINK TE 12s Protection & Control (12s Heartland) Atco requested 12L85 line protection testing 31 Hours
Continuous		  
19-Aug-26 10:00 20-Aug-26 16:00 ATCO Outage 7L71 (848s Ruth Lake - 2082s Dog Rib), 848s 701 (848s Ruth Lake) breaker maintenance 30 Hours
Continuous		  
19-Aug-26 10:00 21-Aug-26 17:30 ATCO, ENEL TE 7LA65 (708s Grizzly Bear - 7L65 tap) 7L65 rebuild, 21A/7LA65 and 21B/7LA65 relay settings updates + end-to-end testing
 55.5 Hours
Continuous		  
19-Aug-26 10:00 21-Aug-26 17:30 ATCO TE 710s Protection & Control (710s Vermilion) 7L65 rebuild, 21A/7L65 and 21B/7L65 relay settings updates + end-to-end testing between 708s Grizzly Bear, 709s Vegreville, and 710s Vermillion 55.5 Hours
Continuous		  
19-Aug-26 10:30 19-Aug-26 16:00 ALTALINK TE 163s Protection & Control (163s Amoco Empress) settings change and testing of new set points on T1 A & B protections 5.5 Hours
Continuous		  
19-Aug-26 11:00 20-Aug-26 16:00 ALTALINK TE 650s RTU/SCADA (650s Hansman Lake) RTU database update 29 Hours
Daily		  
20-Aug-26 08:00 24-Aug-26 20:00 SUNCOR TE 29EDD-1 29EDD1s1152 (29EDD-1 Millennium), 29EDD-1 29EDD1s1552 (29EDD-1 Millennium) 29EDD-1 / N72B1 north bus PRC-005 / relay test 108 Hours
Continuous		  
20-Aug-26 08:00 21-Aug-26 16:00 ALTALINK TE 510s RTU/SCADA (510s Sunnybrook) split the existing SCADA VLAN from 1 to 1 and 2 32 Hours
Daily		  
20-Aug-26 08:00 20-Aug-26 16:00 ENMAX Outage 33.2TR (SS-33) relays, lockout testing 8 Hours
Continuous		  
20-Aug-26 08:00 20-Aug-26 12:00 ENMAX TE 54.81L (SS-54 - SS-65) SS54 54.81L 'A' protection outage, L90 internal battery fail 4 Hours
Continuous		  
20-Aug-26 08:00 20-Aug-26 16:00 ENMAX RB 21.61L (SS-21 - SS-34) tree trimming 8 Hours
Continuous		  
20-Aug-26 08:00 20-Aug-26 16:00 ENMAX RB 15.62L (SS-15 - SS-16) tree trimming 8 Hours
Continuous		  
20-Aug-26 09:00 20-Aug-26 16:00 ATCO TE ATCO Telecom Equipment Dover_T-Telecom/Mackay River_S-Telecom outage
 7 Hours
Continuous		  
21-Aug-26 07:30 26-Aug-26 19:30 ATCO, ALTALINK RB 939L (77s Sagitawah - 809s Louise Creek) line inspection on 9L939/38 132 Hours
Continuous		  
21-Aug-26 07:30 26-Aug-26 17:30 ATCO, ALTALINK RB 938L (77s Sagitawah - 809s Louise Creek) line inspection 9L939/38 130 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 16:00 ENMAX Outage 16.61L (SS-16 - SS-27), 16B69-16.61 (SS-16) breaker power factor test 8 Hours
Continuous		  
21-Aug-26 08:00 23-Aug-26 16:00 ALTALINK TE 72s RTU/SCADA (72s Leismer) split the existing SCADA VLAN from 1 to 1 and 2 56 Hours
Daily		  
21-Aug-26 08:00 26-Aug-26 19:00 ATCO, ALTALINK RB 9L939 (77s Sagitawah - 809s Louise Creek) line inspection on 9L939/38 131 Hours
Continuous		  
21-Aug-26 08:00 26-Aug-26 17:00 ATCO, ALTALINK RB 9L938 (77s Sagitawah - 809s Louise Creek) line inspection 9L939/38 129 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 16:00 ENMAX Outage 41.1C (SS-41), 41B138-41.1CAP (SS-41) internal battery fail alarm 8 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 17:00 ATCO, ALTALINK, SHELL TE 402s Protection & Control (402s Scotford Expansion 1) urgent protection outage to troubleshoot air break status into protection and test B87/21/807L L90 relay to prevent mis-operation 9 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 17:00 ALTALINK TE 233s Protection & Control (233s Beamer) urgent work to block protection on 807L B87/21/L1 URL90 for testing of protection logic to prevent mis-operation 9 Hours
Continuous		  
21-Aug-26 08:00 21-Aug-26 17:00 ALTALINK TE 410s Protection & Control (410s Josephburg) urgent work to block protection 807L B87/21/L7 URL90 for testing of protection logic to prevent mis-operation 9 Hours
Continuous		  
21-Aug-26 10:00 21-Aug-26 16:00 ATCO TE ATCO Telecom Equipment, 720s RTU/SCADA (720s Wabasca) swapping site networking to VPLS 11 6 Hours
Continuous		  

Prepared On:   2026-08-12   15:12:53

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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