Alberta Electric System Operator
System Co-ordination Plan
2026-06-18 to 2026-06-26
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 30-Jun-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 11,217 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		  
12-Jan-26 07:00 03-Jul-26 17:00 EPCOR TE 330p Protection & Control (330p Genesee) protect blocking, annual relay maintenance and password changes 4,137 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		  
03-Feb-26 09:00 09-Jul-26 17:00 ATCO TE 972s RTU/SCADA (972s Tinchebray) config changes needed throughout the CETO project 3,751 Hours
Continuous		  
09-Feb-26 09:00 09-Jul-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) block all 50BF protection until cutovers and associated commissioning are complete 3,607 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 26-Jun-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 2,570.25 Hours
Continuous		  
22-Mar-26 13:00 30-Jun-26 17:00 BHE Canada Outage 120s C1 (120s Picture Butte), 120s C2 (120s Picture Butte) forced outage 2,404 Hours
Continuous		  
28-Mar-26 12:00 26-Jun-26 17:00 ATCO TE 833s RTU/SCADA (833s Mariana) updating RTU/station controller configuration during SCADA upgrade project 1,661 Hours
Continuous		  
06-Apr-26 08:00 19-Jun-26 16:00 ALTALINK TE 37s RTU/SCADA (37s North Calder) RTU database updates 1,784 Hours
Continuous		  
25-Apr-26 08:00 01-Jul-26 16:00 ENMAX Outage 1.82L (SS-1 - SS-5), 5B138-1.82 (SS-5), 1MD138-1.82 (SS-1) 1 sub Transmission line cut over 1,520 Hours
Continuous		  
25-Apr-26 08:00 01-Jul-26 16:00 ENMAX Outage 1.84L (SS-1 - SS-5), 5B138-1.84 (SS-5), 1MD138-1.84 (SS-1) 1 sub Transmission line cut over 1,520 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 28-Aug-26 17:00 EPCOR TE 987s Protection & Control (987s Clover Bar) protection blocking - relay maintenance and bus differential upgrade project 2,434 Hours
Continuous		  
26-May-26 09:30 15-Jul-26 16:30 ALTALINK Outage 157s C1 (157s Lac La Biche) trip test (157s852) 1,207 Hours
Continuous		  
27-May-26 18:00 19-Jun-26 17:00 ALTALINK Outage 526s C1 (526s Buffalo Creek) forced outage 551 Hours
Daily		  
01-Jun-26 08:00 25-Jun-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) trip test 37s76, 37s81 584 Hours
Continuous		  
01-Jun-26 09:00 16-Jul-26 17:30 ATCO TE 865s RTU/SCADA (865s Saddlehills) updating RTU/station controller configuration during SCADA upgrade project 1,088.5 Hours
Continuous		  
02-Jun-26 10:00 13-Jul-26 16:00 ATCO Outage 743s 701T (743s Sarah Lake), 743s 705 (743s Sarah Lake), 743s 605 (743s Sarah Lake), 743s 501 (743s Sarah Lake) 743S Sarah lake rebuild 990 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 30-Oct-26 17:00 EPCOR TE EP 511s Protection & Control (EP 511s Victoria) 72kV breaker fail protection blocking 2,626 Hours
Continuous		  
08-Jun-26 08:00 02-Jul-26 16:00 ENMAX Outage 37.2TR (SS-37) maintenance 440 Hours
Continuous		  
08-Jun-26 08:00 19-Jun-26 14:30 CMH, TCPL TE MH-65L (MHS-7 Brier Park - Cancarb Energy Medicine Hat) maintenance on the LDR-65L-B 270.5 Hours
Continuous		  
08-Jun-26 08:00 26-Jun-26 10:00 ALTALINK, ATCO Outage 87s 240kV East Bus (87s Gaetz), 9L62 (87s Gaetz - 972s Tinchebray), 962L (87s Gaetz - 972s Tinchebray), 986L (87s Gaetz - 972s Tinchebray), 9L86 (87s Gaetz - 972s Tinchebray), 87s T2 (87s Gaetz), 87s 1252 (87s Gaetz), 87s 1652 (87s Gaetz), 87s 1552 (87s Gaetz), 87s 1952 (87s Gaetz), 87s 34 (87s Gaetz) completing all telecom work & protection testing with ATCO 514 Hours
Continuous		  
08-Jun-26 09:00 21-Jun-26 20:00 SUNCOR Outage 29EDD-34 29PT-341 (29EDD-34), 29EDD-34 29-952-142 (29EDD-34), 29EDD-34 29-952-143 (29EDD-34), 29EDD-34 29-652-10200T (29EDD-34), 29EDD-34 29-652-10301 (29EDD-34), 29EDD-34 29-652-10302 (29EDD-34), 29EDD-34 29-652-10303 (29EDD-34), 29EDD-34 29PS-0375 (29EDD-34), 29EDD-34 29PS-0380 (29EDD-34), 29EDD-34 29PS-0381 (29EDD-34), 29EDD-34 29PS-0383 (29EDD-34), 29EDD-34 29PS-609 (29EDD-34) 10 year PM on 29EDD34;29PT-341 system and 5 year, 10 year PM on 29EDD34;29PP-103 system
 323 Hours
Continuous		  
08-Jun-26 09:00 22-Jun-26 17:00 ATCO Outage 7L88 (865s Saddle Hills - 7L22 tap), 865s 701T (865s Saddlehills), 865s 701 (865s Saddle Hills) protection and scada upgrade on 865S 344 Hours
Continuous		  
09-Jun-26 07:00 13-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 826.5 Hours
Continuous		  
09-Jun-26 07:00 14-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 50BF/705 for relay testing 178.5 Hours
Continuous		  
09-Jun-26 07:00 14-Jul-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) isolating 50BF/605 for relay testing 178.5 Hours
Continuous		  
10-Jun-26 08:00 23-Jun-26 16:00 SUNCOR TE 29EDD-34 RTU/SCADA (29EDD-34) add duplicate power sources 80 Hours
Continuous		  
10-Jun-26 09:00 19-Jun-26 17:00 BCH Outage 2L294 (BCH A. A. Lambert - BCH Cranbrook), T3 (BCH Cranbrook), T7 (BCH Cranbrook) insulator replacement 224 Hours
Continuous		 AB-BC
13-Jun-26 08:00 21-Jun-26 17:00 ALTALINK TE 72s Protection & Control (72s Leismer) protection outages to connect CTs and perform functional trips during the 475s mobile installation to facilitate the urgent 72s T2 outage 201 Hours
Continuous		  
13-Jun-26 17:01 26-Jun-26 17:00 ATCO, ALTALINK Outage 9L62 (87s Gaetz - 972s Tinchebray) work on parallel line 9L86 272 Hours
Continuous		  
14-Jun-26 08:30 19-Jun-26 14:00 ENMAX Outage 13.82L (SS-13 - SS-22), 13B138-13.82 (SS-13), 22B138-13.82 (SS-22) disconnect switch replacement 125.5 Hours
Continuous		  
15-Jun-26 07:00 24-Jul-26 17:00 EPCOR Outage EP 805s J2403 (EP 805s Jasper) J2403 replacement LCR 946 Hours
Continuous		  
15-Jun-26 07:00 19-Jun-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) Victoria: TX3 Relay Maintenance and V724/V725 (SF6) Breaker Maintenance 106 Hours
Continuous		  
15-Jun-26 07:00 19-Jun-26 17:00 EPCOR Outage 987s GT2 (987s Clover Bar), 987s CGB2 (987s Clover Bar) Cloverbar: customer maintenance 106 Hours
Continuous		  
15-Jun-26 07:00 19-Jun-26 17:00 ALTALINK, EPCOR Outage 1058L (657s Summerside - EP 803s Lambton), EP 803s L2404 (EP 803s Lambton), EP 803s L2403 (EP 803s Lambton), S724 (Strathcona) aerial washing program 106 Hours
Continuous		  
15-Jun-26 07:00 26-Jun-26 17:00 ALTALINK, EPCOR TE 1056L (89s Ellerslie - 629s Argyll Transfer Station) MPLS upgrade cutover and commissioning 274 Hours
Continuous		  
15-Jun-26 07:00 18-Jun-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) RTU/HMI change: testing and commissioning SCADA points for line 986L CETO project 82 Hours
Daily		  
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		  
15-Jun-26 07:00 19-Jun-26 17:00 EPCOR Outage 987s 72kV Bus 3 (987s Clover Bar), 72CK12 (987s Clover Bar - Kennedale), 987s CC13 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CGB2 (987s Clover Bar), 987s CK725 (987s Clover Bar) Cloverbar: 72kV BUS 3 outage, CVT doble and disconnect maintenance 106 Hours
Continuous		  
15-Jun-26 07:00 06-Jul-26 17:00 EPCOR Outage 72JM18 (EP 805s Jasper - Meadowlark), M721 (Meadowlark), M722 (Meadowlark), T1 (Meadowlark), MAB1 (Meadowlark) Meadowlark: TX1 Zone, LCR Civil Work 274 Hours
Continuous		  
15-Jun-26 07:30 18-Jun-26 18:00 ALTALINK Outage 1325L (510s Sunnybrook - AML 511s Crossings), AML 511s T11 (AML 511s Crossings), 510s T11 (510s Sunnybrook), 510s 2652 (510s Sunnybrook), 510s 2752 (510s Sunnybrook), AML 511s 4852 (AML 511s Crossings), AML 511s 4952 (AML 511s Crossings), 510s 4289 (510s Sunnybrook), 510s 41 (510s Sunnybrook), 510s 43 (510s Sunnybrook), AML 511s 1489 (AML 511s Crossings), AML 511s 76 (AML 511s Crossings), AML 511s 74 (AML 511s Crossings) component replacement on 1325L 82.5 Hours
Continuous		  
15-Jun-26 07:30 25-Jun-26 09:30 ALTALINK Outage 905L (19s Wabamun - 37s North Calder), 19s 905 (19s Wabamun), 37s 82 (37s North Calder), 37s 76 (37s North Calder), 37s 71 (37s North Calder), 19s 98 (19s Wabamun) P&C upgrade (37s76, 37s82) 242 Hours
Continuous		  
15-Jun-26 08:00 26-Jun-26 16:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) MPLS TPR re-arrangements project: relay testing and cutover 272 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 364s RTU/SCADA (364s Whitecourt Industrial) firewall replacement + MPLS 705 A&B node upgrade 80 Hours
Continuous		  
15-Jun-26 08:00 25-Jun-26 09:00 ALTALINK, EPCOR RB 930L (37s North Calder - Poundmaker) reclose block for Altalink working on 37s North Calder 241 Hours
Continuous		  
15-Jun-26 08:00 25-Jun-26 09:00 ALTALINK, EPCOR RB 920L (37s North Calder - 557s Castle Downs) reclose block for Altalink working on 37s North Calder 241 Hours
Continuous		  
15-Jun-26 08:00 03-Jul-26 16:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale) RTU replacement 440 Hours
Daily		  
15-Jun-26 08:00 21-Jun-26 14:00 ATCO Outage 6L15 (763s Hanna - 775s Sullivan Lake), 763s 602 (763s Hanna), 775s 601 (775s Sullivan Lake) 10-year climbing inspection on 6L15 150 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 41.1TR (SS-41) transformer power factor test, secondary cable test, transformer maintenance relay fault pressure test 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 397s RTU/SCADA (397s Benbow) RTU outage required to add and test AIS1159 alarms 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 328s RTU/SCADA (328s Pine Creek) RTU outage required for HMI password update 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 1182s RTU/SCADA (1182s Berland River) RTU outage required to add 138kV bus volts metering 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 397s Protection & Control (397s Benbow) protection outages required to add AIS trip 3 alarm from A77/AIS1159 & B77/AIS1159 protections 80 Hours
Continuous		  
15-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 1182s Protection & Control (1182s Berland River) protection outages required to add bus volts from T1 protections (redundant), and test 43/152 input to 96/152 protection (non-redundant) 80 Hours
Continuous		  
15-Jun-26 09:00 29-Jun-26 10:00 ATCO, CNRL Outage 859s 701T (859s Primrose), 859s 701 (859s Primrose), 859s 701TD (859s Primrose), 859s 704 (859s Primrose) maintenance 337 Hours
Continuous		  
15-Jun-26 09:00 18-Jun-26 17:00 ALTALINK Outage 245s 10 (245s Seebe) CT replacement 77 Hours
Continuous		  
15-Jun-26 09:00 19-Jun-26 17:30 ALTALINK, EPCOR IO 915L (38s East Edmonton - 987s Clover Bar) 915L/Cloverbar: CT/CVT/SA Doble and CDS35/CDS36/CDS7 Disconnect Maintenance and Relay Maintenance 103.5 Hours
Continuous		  
15-Jun-26 09:00 20-Jun-26 17:30 ALTALINK, EPCOR IO 1139L (367s Harry Smith - EP Riverview) zone doble, disconnect and breaker maintenance 127.5 Hours
Continuous		  
15-Jun-26 09:30 20-Jun-26 17:00 ALTALINK, EPCOR Outage 1139L (367s Harry Smith - EP Riverview), RW2405 (EP Riverview), RW2403 (EP Riverview), RWDS12 (EP Riverview) zone doble, disconnect and breaker maintenance 127.5 Hours
Continuous		  
15-Jun-26 10:30 18-Jun-26 16:30 ALTALINK Outage 704L (51s Wainwright - 478s Tucuman), 51s 704 (51s Wainwright), 478s 152 (478s Tucuman) transmission line maintenance 78 Hours
Continuous		  
15-Jun-26 11:00 19-Jun-26 17:00 ALTALINK Outage 1002L (163s Amoco Empress - 275s Jenner), 163s 1752 (163s Amoco Empress), 163s 1552 (163s Amoco Empress), 163s Protection & Control (163s Amoco Empress), 163s 1002 (163s Amoco Empress) replace 163s1752 breaker CT at 163s Amoco 102 Hours
Continuous		  
15-Jun-26 12:00 19-Jun-26 12:30 ALTALINK Outage 72s T2 (72s Leismer), 72s 1052 (72s Leismer), 72s C1 (72s Leismer), 72s C2 (72s Leismer), 72s 31 (72s Leismer) urgent H1 bushing replacement
120.5 Hours
Continuous		  
15-Jun-26 12:30 18-Jun-26 17:00 ALTALINK Outage 198s T1 (198s Blackfalds) transformer maintenance, doble, IDD wiring repair & tap changer major maintenance 76.5 Hours
Continuous		  
15-Jun-26 13:00 18-Jun-26 16:30 ALTALINK TE 245s Protection & Control (245s Seebe) 245s10 CT replacement
 75.5 Hours
Continuous		  
16-Jun-26 07:30 19-Jun-26 18:00 ALTALINK Outage 534s 138kV Bus 1 (534s Eckville), 758L (534s Eckville - 757L tap), 534s T1 (534s Eckville), 534s 758 (534s Eckville), 534s 40 (534s Eckville) Str 4: replace arms insulators
Str 13 replace str
Str 21 replace str single pole tangent
Str 40: change single pole tangent.
Str 38,39 arm changes
82.5 Hours
Continuous		  
16-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 39.4TR (SS-39) relay protection test 56 Hours
Continuous		  
16-Jun-26 09:00 26-Jun-26 17:00 ATCO, ALTALINK Outage 972s 902 (972s Tinchebray), 972s 903 (972s Tinchebray), 9L86 (87s Gaetz - 972s Tinchebray) connect new 9L86 to 972S and prepare to energize, complete protection commissioning 224 Hours
Continuous		  
16-Jun-26 09:00 19-Jun-26 15:00 ATCO Outage 800s 702T (800s Friedenstal), 800s 602TD (800s Friedenstal), 800s 712 (800s Friedenstal) transformer class2 major testing 78 Hours
Continuous		  
16-Jun-26 09:00 26-Jun-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) commission both 21A and 21B relays for 9L86 during the line outage 224 Hours
Continuous		  
16-Jun-26 13:01 18-Jun-26 13:00 ATCO Outage 780s 705 (780s Lubicon) breaker SF6 LTB145D1/B complete testing 47.98 Hours
Continuous		  
16-Jun-26 15:57 23-Jun-26 18:00 ALTALINK, BHE Outage 879L (244s Bowmanton - 879AL tap), 879L (368s Burdett - 879L tap), 368s 879 (368s Burdett), 719s 138CB1 (719s Rattlesnake Ridge), 719s 138MDS1 (719s Rattlesnake Ridge) forced outage 170.05 Hours
Continuous		  
17-Jun-26 07:00 24-Jun-26 17:00 EPCOR Outage 987s GT3 (987s Clover Bar), 987s CGB3 (987s Clover Bar) maintenance 178 Hours
Continuous		  
17-Jun-26 07:00 18-Jun-26 16:00 ENMAX Outage B138-94 (SS-1), B138-95 (SS-1), MD138_107 (SS-1), MD138_108 (SS-1) 1 sub transmission line cut over. commissioning 33 Hours
Continuous		  
17-Jun-26 08:00 18-Jun-26 17:00 ALTALINK Outage 870L (262s Rocky Mountain House - 263s Strachan), 262s 870W (262s Rocky Mountain House), 263s 870E (263s Strachan) replacing structure 12 and replacing cross arms and insulators on structure 13
33 Hours
Continuous		  
17-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 38.3TR (SS-38) take measurements in secondary cabinet, test secondary CT 32 Hours
Continuous		  
17-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 22B138-13.82 (SS-22) breaker maintenance 32 Hours
Continuous		  
17-Jun-26 08:30 18-Jun-26 16:00 ALTALINK TE 895s Protection & Control (895s Suffield) relay PRC005 maintenance (6yr compliance) and prep work for 2272L metering equipment upgrade 31.5 Hours
Daily		  
17-Jun-26 09:30 20-Jun-26 17:30 ATCO Outage 6L21 tap xfmr testing 80 Hours
Continuous		  
17-Jun-26 10:00 18-Jun-26 16:00 ATCO Outage 700s 706C (700s Bonnyville), 700s 706 (700s Bonnyville) test ASEA IMBD CT 30 Hours
Continuous		  
17-Jun-26 13:00 19-Jun-26 17:30 ATCO Outage 2029s ACF14 (2029s Heathfield), 2029s 1221 (2029s Heathfield) filter bank maintenance 52.5 Hours
Continuous		  
17-Jun-26 22:00 18-Jun-26 04:00 EPCOR Outage BR722 (Rossdale) emergency hot connection investigation 6 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE AltaLink Telecom Equipment troubleshoot and replace defective radio components, end-to-end testing required after radio is repaired 8 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D87 protection outage, relays, lockout testing 8 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE 281s RTU/SCADA (281s Johnson) configure push on the RTU to add more SCADA points 8 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ALTALINK TE AML 511s RTU/SCADA (AML 511s Crossings) update the RTU/HMI configuration for the new intrusion alarms to meet the compliance 8 Hours
Continuous		  
18-Jun-26 08:00 18-Jun-26 16:00 ENMAX Outage 36.2TR (SS-36) center & east 138KV LA hot spot - change LA's 8 Hours
Continuous		  
18-Jun-26 08:30 18-Jun-26 17:00 ALTALINK TE 895s RTU/SCADA (895s Suffield) upgrade 2272L Meter module 8.5 Hours
Daily		  
18-Jun-26 09:00 18-Jun-26 16:00 ATCO TE ATCO Telecom Equipment Salt Creek_S-Telecom/Thickwood Hills_S-Telecom- Radio Major IRU link Salt Creek to Thickwood 7 Hours
Continuous		  
18-Jun-26 09:00 18-Jun-26 15:00 ALTALINK TE 42s RTU/SCADA (42s Sarcee), AltaLink Telecom Equipment firewall replacement, MPLS 7705 A&B upgrade, raw socket upgrade, LAN switch replacement 80 Hours
Continuous		  
18-Jun-26 09:00 19-Jun-26 17:00 BCH RB 5L91 (BCH Ashton Creek - BCH Selkirk) 5L91 AR turned off 32 Hours
Continuous		 AB-BC
19-Jun-26 07:00 20-Jun-26 18:00 ALTALINK Outage 185L (379s Shell Canada Waterton - 396s Pincher Creek), 379s 185N (379s Shell Canada Waterton), 396s 185 (396s Pincher Creek) replacing cross arms and insulators 35 Hours
Continuous		  
19-Jun-26 08:00 19-Jun-26 16:00 ENMAX, ALTALINK Outage 693L (42s Sarcee - SS-10), 10B138-693 (SS-10), 42s 693 (42s Sarcee) sf6 gas sample, switch adjustment 8 Hours
Continuous		  
19-Jun-26 08:00 19-Jun-26 10:00 ENMAX Outage 2.2TR (SS-2) summer substation washing. reversing switch check - 2.2-TC 2 Hours
Continuous		  
19-Jun-26 08:00 19-Jun-26 16:00 ENMAX, ALTALINK IO 693L (42s Sarcee - SS-10) breaker SF6 gas sample - 10B138-693 8 Hours
Continuous		  
19-Jun-26 09:00 25-Jun-26 17:00 BCH Outage 2L294 (BCH A. A. Lambert - BCH Cranbrook) maintenance 152 Hours
Continuous		 AB-BC
19-Jun-26 10:00 19-Jun-26 12:00 ENMAX Outage 2.3TR (SS-2) summer substation washing, reversing switch check - 2.3-TC 2 Hours
Continuous		  
19-Jun-26 12:00 19-Jun-26 16:00 ENMAX Outage 2.4TR (SS-2) summer substation washing, reversing switch check, bushing oil sampling 4 Hours
Continuous		  
19-Jun-26 12:00 20-Jun-26 18:00 ALTALINK Outage 72s T1 (72s Leismer) outage to remove 475s mobile 29.5 Hours
Continuous		  
19-Jun-26 12:00 19-Jun-26 13:00 ATCO, ALTALINK Outage 7L114 (72s Leismer - 7LA114 tap), 7L114 (907s Waddell - 7LA114 tap) Altalink will tap down a mobile sub that was back feeding the 144kv
 1 Hour
Continuous		  
20-Jun-26 08:00 20-Jun-26 16:00 ALTALINK TE 281s RTU/SCADA (281s Johnson) split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Continuous		  
21-Jun-26 07:15 22-Jun-26 18:00 ALTALINK Outage 706L (54s Fort Saskatchewan - 706AL tap), 54s 706N (54s Fort Saskatchewan) transmission line maintenance 34.75 Hours
Continuous		  
21-Jun-26 07:15 22-Jun-26 17:45 ALTALINK Outage 739L (14s Devon - 155s Blackmud), 14s 739E (14s Devon), 155s 739 (155s Blackmud) line maintenance 34.5 Hours
Continuous		  
21-Jun-26 07:30 30-Jun-26 09:30 ALTALINK Outage 77s 29 (77s Sagitawah) protection upgrade 218 Hours
Continuous		  
21-Jun-26 08:00 05-Jul-26 16:00 Syncrude Outage 12 (Aurora), UT1 (Aurora), 13 (Aurora) 6yr PM 344 Hours
Continuous		  
22-Jun-26 06:00 22-Jun-26 18:00 SUNCOR TE 635EDD-1000 RTU/SCADA (635EDD-1000) modifying settings on RTAC/RTU substation controllers at 635EDD-1000 substation to allow for troubleshooting of tap changer indication 12 Hours
Continuous		  
22-Jun-26 07:00 22-Jun-26 17:00 EPCOR Outage EP 511s V726 (EP 511s Victoria) Victoria: V726 (SF6) breaker maintenance 10 Hours
Continuous		  
22-Jun-26 07:00 25-Jun-26 17:00 EPCOR Outage 987s GT1 (987s Clover Bar), 987s CGB1 (987s Clover Bar), 987s GDS1 (987s Cloverbar) maintenance 82 Hours
Continuous		  
22-Jun-26 07:00 03-Jul-26 17:00 ALTALINK, EPCOR TE 947L (89s Ellerslie - 987s Clover Bar) protection blocking, MPLS upgrade cutover and commissioning 274 Hours
Continuous		  
22-Jun-26 07:00 03-Jul-26 17:00 ALTALINK, EPCOR TE 915L (38s East Edmonton - 987s Clover Bar) protection blocking, MPLS upgrade cutover and commissioning 274 Hours
Continuous		  
22-Jun-26 07:00 25-Jun-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) RTU/HMI change: testing and commissioning SCADA points for line 986L CETO project 82 Hours
Continuous		  
22-Jun-26 07:00 26-Jun-26 17:00 ALTALINK, EPCOR RB 1058L (657s Summerside - EP 803s Lambton) aerial 1059L jumper repair 106 Hours
Continuous		  
22-Jun-26 07:00 26-Jun-26 17:00 EPCOR TE 72NW15 (Namao - Woodcroft), 72JW19 (EP 805s Jasper - Woodcroft) JW19/NW15: protection blocking, relay maintenance and VRR project 106 Hours
Continuous		  
22-Jun-26 07:00 22-Jun-26 17:00 EPCOR Outage T3 (Strathcona) calisto leak repair 10 Hours
Continuous		  
22-Jun-26 07:30 22-Jun-26 16:30 ENMAX, ALTALINK IO 918L (281s Johnson - SS-162) summer substation washing, 86-BF-918 relays, lockout testing 9 Hours
Continuous		  
22-Jun-26 07:30 26-Jun-26 17:30 CMH Outage MH-10L (MHS-10 Box Springs - MHS-8 Burnside), MHS-10 MH138-1008 (MHS-10 Box Springs), MHS-10 MH138-1011 (MHS-10 Box Springs), MHS-10 MH138-1005 (MHS-10 Box Springs), MHS10 MH138-T102 (MHS-10 Box Springs), MHS-8 MH138-803 (MHS-8 Burnside) breaker maintenance 34 Hours
Continuous		  
22-Jun-26 08:00 29-Jun-26 16:00 ATCO Outage 7L48 (794s Valleyview - 7LA48 tap), 794s 703 (794s Valleyview) pole replacement 176 Hours
Continuous		  
22-Jun-26 08:00 03-Jul-26 16:00 ALTALINK IO 89s Protection & Control (89s Ellerslie) relay testing and cutover, protection blocking, MPLS upgrade cutover and commissioning 272 Hours
Continuous		  
22-Jun-26 08:00 03-Jul-26 16:00 ALTALINK IO 38s Protection & Control (38s East Edmonton) 915L (38s East Edmonton-987s Clover Bar): relay testing and cutover, protection blocking, MPLS upgrade cutover and commissioning 272 Hours
Continuous		  
22-Jun-26 08:00 26-Jun-26 16:00 ALTALINK TE 37s RTU/SCADA (37s North Calder) RTU database update 104 Hours
Continuous		  
22-Jun-26 08:00 24-Jun-26 16:00 ALTALINK TE 63s RTU/SCADA (63s Red Deer), AltaLink Telecom Equipment firewall replacement, MPLS 7705 A&B&C node upgrade 56 Hours
Continuous		  
22-Jun-26 08:00 22-Jun-26 16:00 ENMAX, ALTALINK Outage 918L (281s Johnson - SS-162), 162B240-RB133 (SS-162), 162B240-RB132 (SS-162), 162MD240-918L (SS-162) summer substation washing, 86-BF-918 relays, lockout testing 8 Hours
Continuous		  
22-Jun-26 08:00 03-Jul-26 16:00 Syncrude Outage 89-27 (Aurora), MH1 (Aurora - Aurora) SCL - power line work 272 Hours
Continuous		  
22-Jun-26 08:00 24-Jun-26 16:00 ALTALINK TE 138s Protection & Control (138s Windy Flats) maintenance 56 Hours
Daily		  
22-Jun-26 08:00 24-Jun-26 16:00 ALTALINK TE 138s RTU/SCADA (138s Windy Flats) Techs to complete RTU configuration update to adhere to standard 56 Hours
Continuous		  
22-Jun-26 08:00 30-Jun-26 16:00 ALTALINK TE 254s Protection & Control (254s Coaldale) perform secondary injection to P&C relays to verify the SCADA metering and DNP alarms to ACC/EMS 200 Hours
Daily		  
22-Jun-26 08:00 23-Jun-26 16:00 ALTALINK TE 510s RTU/SCADA (510s Sunnybrook) update the RTU and HMI configuration for new intrusion alarms 32 Hours
Continuous		  
22-Jun-26 08:00 15-Oct-26 16:00 Syncrude Outage 814 (Syncrude Mildred Lake), 815 (Syncrude Mildred Lake), 816 (Syncrude Mildred Lake) replace 72kV underground feeder cables on west mine feeder 2,768 Hours
Continuous		  
22-Jun-26 08:00 22-Jun-26 12:00 ENMAX Outage 26.81L (SS-26 - SS-32), 26B138-26.81 (SS-26), 32B138-26.81 (SS-32) HV breaker SF6 gas sample - 26B138-26.81 4 Hours
Continuous		  
22-Jun-26 08:00 22-Jun-26 16:00 ENMAX TE Protection & Control (SS-162) 162sub 86-BF 918 240kV protection outage, relays, lockout testing 86-BF-918 8 Hours
Continuous		  
22-Jun-26 09:00 05-Jul-26 20:00 SUNCOR Outage 29EDD-34 29PT-340 (29EDD-34), 29EDD-34 29-952-132 (29EDD-34), 29EDD-34 29-952-133 (29EDD-34), 29EDD-34 29-652-10201 (29EDD-34), 29EDD-34 29-652-10202 (29EDD-34), 29EDD-34 29-652-10203 (29EDD-34), 29EDD-34 29-652-10200T (29EDD-34) 29EDD34;29PT-340 SYSTEM;PM 5y,10y; 29EDD34;29PP-102 SYSTEM;PM 5y,10y
 323 Hours
Continuous		  
22-Jun-26 09:00 28-Jun-26 17:00 ALTALINK, EPCOR Outage 1059AL (52s East Industrial - 1059L tap), 1059L (EP 803s Lambton - 1059AL tap), 1059L (38s East Edmonton - 1059AL tap), 52s T1 (52s East Industrial), EP 803s L2401 (EP 803s Lambton), EP 803s L2404 (EP 803s Lambton), 52s E2401 (52s East Industrial), 52s EDS1 (52s East Industrial) East Industrial -- apparatus- TX1 Doble, and aerial- jumper conductor repair and insulator washing 152 Hours
Continuous		  
22-Jun-26 09:00 22-Jun-26 11:00 ATCO TE 888s RTU/SCADA (888s Dover), ATCO Telecom Equipment upgrade the NET 1 and NET 11 SAR's to V21, then V22 2 Hours
Continuous		  
22-Jun-26 09:00 22-Jun-26 17:00 ATCO RB 7L22 (790s Poplar Hill - 7L88 tap), 7L22 (811s Clairmont Lake - 7L88 tap), 7L88 (865s Saddle Hills - 7L22 tap) tap mobile sub up to 7L88 inside 865s Saddle Hills 8 Hours
Continuous		  
22-Jun-26 09:30 27-Jun-26 17:00 ALTALINK, EPCOR Outage 921L (71s Lamoureux - 987s Clover Bar), 987s C2404 (987s Clover Bar), 987s C2406 (987s Clover Bar), 987s CDS40 (987s Cloverbar) 921L/Cloverbar: CT/CVT/SA Doble and CDS30/CDS32/CDS40 disconnect maintenance and C2404 (Min Oil) breaker maintenance and C2404/C2406 capacitor nameplate pictures and C2401 relay maintenance 127.5 Hours
Continuous		  
22-Jun-26 09:30 27-Jun-26 17:00 ALTALINK, EPCOR IO 921L (71s Lamoureux - 987s Clover Bar) 921L/Cloverbar: CT/CVT/SA Doble and CDS9/CDS14/CDS17 disconnect maintenance and C2404 (Min Oil) breaker maintenance and C2401 relay maintenance 127.5 Hours
Continuous		  
22-Jun-26 09:30 23-Jun-26 17:30 ATCO Outage 763s 601 (763s Hanna), 6L56 (763s Hanna - 802s Michichi Creek) BREAKER MIN OIL HLC PARTIAL TESTING 32 Hours
Continuous		  
22-Jun-26 09:30 28-Jun-26 17:00 ALTALINK, EPCOR IO 1059L (38s East Edmonton - 1059AL tap), 1059L (EP 803s Lambton - 1059AL tap) apparatus- TX1 Doble, and aerial- jumper conductor repair and insulator washing 151.5 Hours
Continuous		  
22-Jun-26 10:00 24-Jun-26 12:00 ATCO Outage 2029s ACF11 (2029s Heathfield), 2029s 1218 (2029s Heathfield) filter bank AC maintenance 50 Hours
Continuous		  
22-Jun-26 10:00 24-Jun-26 16:00 ATCO Outage 709s 702T (709s Vegreville), 709s 702 (709s Vegreville) transformer maintenance

 54 Hours
Continuous		  
22-Jun-26 10:00 23-Jun-26 17:00 ATCO Outage 2043s 701 (2043s Freer), 2043s 701T (2043s Freer) Take an outage on 701 breaker at 2043S to replace tank heater. Perform this during customer outage June 22 to 25, 2026. 31 Hours
Continuous		  
22-Jun-26 10:15 24-Jun-26 16:45 ALTALINK Outage 704L (51s Wainwright - 478s Tucuman), 51s 704 (51s Wainwright), 478s 152 (478s Tucuman) transmission line maintenance 54.5 Hours
Continuous		  
22-Jun-26 10:30 25-Jun-26 17:00 ALTALINK Outage 245s 56E (245s Seebe), 56L (20s Ghost - 245s Seebe) 245s56E 138kV CT Replacement 78.5 Hours
Continuous		  
22-Jun-26 10:30 24-Jun-26 17:00 ALTALINK Outage 320p 240kV Bus B (320p Keephills), 1045AL (320p Keephills - 1045L tap), 320p T1 (320p Keephills), 320p 91 (320p Keephills), 320p 90 (320p Keephills), 320p 1352 (320p Keephills), 320p 752 (320p Keephills), 320p 352 (320p Keephills), 320p 2152 (320p Keephills), 320p 213 (320p Keephills) 320p91 PRC5 breaker maintenance and 320p213 switch repair 54.5 Hours
Continuous		  
22-Jun-26 10:30 24-Jun-26 17:00 ALTALINK TE 214s Protection & Control (214s Innisfail) DSP Card replacement and firmware updates 54.5 Hours
Continuous		  
22-Jun-26 10:30 24-Jun-26 17:00 ALTALINK, EPCOR RB 1045L (EP 805s Jasper - 1045AL tap) Altalink work on 1045L 54.5 Hours
Continuous		  
22-Jun-26 11:00 25-Jun-26 16:00 ALTALINK TE 245s Protection & Control (245s Seebe) disable bus protections to block CTs for replacement at start of outage and then disable and unblock at time of re-energization
53 Hours
Daily		  
22-Jun-26 12:00 23-Jun-26 15:00 ALTALINK Outage 668L (394s Empress - 562s Cypress), 394s 668 (394s Empress), 562s 1352 (562s Cypress), 562s 1452 (562s Cypress) line maintenance 27 Hours
Continuous		  
22-Jun-26 12:00 23-Jun-26 16:00 ATCO TE ATCO Telecom Equipment Stoney Mtn_T-Telecom/Cheecham_T-Telecom- Capacity & Reliability upgrades.
IMPACT TO THE FOLLOWING TRAFFIC FOR THE DURATION: 9L55 A&B & 1085L A&B - MCMILLAN / ROUND HILL, 9L85 A&B - KINOSIS / SALT CREEK		 28 Hours
Continuous		  
22-Jun-26 12:00 22-Jun-26 16:00 ENMAX Outage 6.82L (SS-6 - SS-41), 6B138-6.82 (SS-6), 41B138-6.82 (SS-41) breaker SF6 Gas Sample - 6B138-6.82 4 Hours
Continuous		  
22-Jun-26 12:00 10-Jul-26 12:00 ATCO TE 791s RTU/SCADA (791s Rainbow Lake), 791s Protection & Control (791s Rainbow Lake) 701CT testing for breaker repair 432 Hours
Continuous		  
22-Jun-26 13:00 25-Jun-26 15:00 ATCO RB 7L85 (801s Anderson - ATC 803s Bullpound), 7L85 (803s ATC Bullpound - 7LA85 tap), 7L85 (804s Wintering Hills - 7LA85 tap) installing interphase spacers on 7L85 live line 74 Hours
Continuous		  
23-Jun-26 07:00 24-Jun-26 17:00 ALTALINK Outage AML 511s 1352 (AML 511s Crossings) urgent - repair failed trip latch on the C phase of 511s 1352 34 Hours
Continuous		  
23-Jun-26 07:15 28-Jun-26 17:45 ALTALINK Outage 739L (14s Devon - 305s Acheson), 14s 739N (14s Devon), 305s 739 (305s Acheson) line maintenance 14s 130.5 Hours
Continuous		  
23-Jun-26 07:30 23-Jun-26 16:30 ENMAX, ALTALINK IO 932L (74s Janet - SS-162) substation washing and lockout testing 9 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 13:30 ALTALINK Outage 221s T3 (221s Sunken Lake), 221s 39 (221s Sunken Lake) 221s39 breaker maintenance 5.5 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 17:00 ALTALINK Outage 163s 1352 (163s Amoco Empress) nitrogen top up
9 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 16:00 ALTALINK TE 283s RTU/SCADA (283s Violet Grove), AltaLink Telecom Equipment firewall replacement, MPLS 7705 A node upgrade 8 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 16:00 ALTALINK TE 74s RTU/SCADA (74s Janet), AltaLink Telecom Equipment firewall replacement, MPLS 7705A, B andC node upgrade 8 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 16:00 ENMAX, ALTALINK Outage 932L (74s Janet - SS-162), 162B240-RB136 (SS-162), 162B240-RB135 (SS-162) substation washing and lockout testing 8 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 17:30 ALTALINK Outage 710L (56s Boyle - 159s Colinton), 159s 710 (159s Colinton), 56s 710X (56s Boyle) 710L103 urgent repairs 9.5 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 12:00 ENMAX Outage 31.84L (SS-31 - SS-32), 32B138-31.84 (SS-32), 31B138-31.84 (SS-31) breaker SF6 gas sample 4 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 16:00 ENMAX TE Protection & Control (SS-162) 162 sub 86-BF 932 240 kV protection outage - relay protection test - 86-BF-932 8 Hours
Continuous		  
23-Jun-26 08:00 23-Jun-26 16:00 ENMAX Outage 1.3TR (SS-1) remove clamps from the secondary cables 8 Hours
Continuous		  
23-Jun-26 09:00 23-Jun-26 16:00 ATCO, BluEarth TE ATCO Telecom Equipment, 7L128 (802s Michichi Creek - 7LA128 tap), 7L128 (963s Coyote Lake - 7LA128 tap), 7LA128 (572s Highland - 7L128 tap), 802s RTU/SCADA (802s Michichi Creek) Radio PM
 7 Hours
Continuous		  
23-Jun-26 09:00 23-Jun-26 11:00 ATCO, CNRL TE ATCO Telecom Equipment, 847s RTU/SCADA (847s Muskeg River) Muskeg River telecom upgrade
 2 Hours
Continuous		  
23-Jun-26 09:00 23-Jun-26 10:00 ATCO TE 802s RTU/SCADA (802s Michichi Creek), ATCO Telecom Equipment UPGRADING MICHICHI SUB SAR OS TO V21
 1 Hour
Continuous		  
23-Jun-26 09:00 23-Jun-26 16:00 ATCO RB 7L128 (802s Michichi Creek - 7LA128 tap), 7L128 (963s Coyote Lake - 7LA128 tap) telecom outages 1-00523957 and 1-00518130 - prevent line out-of-sync closing 7 Hours
Continuous		  
23-Jun-26 10:00 24-Jun-26 17:00 ATCO Outage 743s 701T (743s Sarah Lake) 743S Sarah Lake rebuild - replace 501A solid blade switches, replace surge arrestors 507, 508 31 Hours
Continuous		  
23-Jun-26 10:15 23-Jun-26 17:00 ALTALINK Outage 848L (17s Benalto - 848AL tap), 17s 848X (17s Benalto) PRC5 breaker maintenance & first trip 6.75 Hours
Daily		  
23-Jun-26 12:00 23-Jun-26 16:00 ENMAX Outage 33.83L (SS-33 - SS-41), 33B138-33.83 (SS-33), 41B138-33.83 (SS-41) breaker SF6 gas sample 4 Hours
Continuous		  
23-Jun-26 13:30 23-Jun-26 18:30 ALTALINK Outage 221s T2 (221s Sunken Lake), 221s 28 (221s Sunken Lake) 221s28 breaker maintenance 5 Hours
Continuous		  
24-Jun-26 07:00 24-Jun-26 18:00 ALTALINK Outage 1046L (310p Sundance - 338s Cherhill), 310p 1052 (310p Sundance), 310p 1152 (310p Sundance) GOI on 1046L for a high load move 11 Hours
Continuous		  
24-Jun-26 07:00 29-Jun-26 17:00 ALTALINK TE 77s RTU/SCADA (77s Sagitawah) RTU database update 130 Hours
Continuous		  
24-Jun-26 07:00 24-Jun-26 18:00 ALTALINK RB 825L (77s Sagitawah - 484s Millar Western) replace contaminated insulation on STR 65 using hot stick work methods
11 Hours
Continuous		  
24-Jun-26 07:30 24-Jun-26 18:00 ALTALINK RB 33s 76 (33s Spray), 76L (33s Spray - 115s Mount Allan) structure103, 108 - arm changes , and structure 58, 63 - woodpecker inspections
10.5 Hours
Continuous		  
24-Jun-26 08:00 25-Jun-26 16:00 ENMAX Outage 15.60L (SS-15 - SS-21), 15B69-15.60 (SS-15), 21B69-15.60 (SS-21) HV breaker maintenance 32 Hours
Continuous		  
24-Jun-26 08:00 24-Jun-26 16:00 ENMAX, ALTALINK Outage 162B138-RB80 (SS-162), 162B138-RB81 (SS-162), 162.81L (391s Balzac - SS-162), 162MD138-162.81 (SS-162), 391s 162.81 (391s Balzac) summer substation washing 8 Hours
Continuous		  
24-Jun-26 08:00 24-Jun-26 16:30 ALTALINK Outage 391s 162.81 (391s Balzac) summer substation washing 8.5 Hours
Continuous		  
24-Jun-26 08:00 24-Jun-26 16:00 ALTALINK TE 33s RTU/SCADA (33s Spray) pushing new config to increase SCADA points for future fault reporting project 8 Hours
Continuous		  
24-Jun-26 08:00 24-Jun-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D85 protection outage - relays, lockout testing 8 Hours
Continuous		  
24-Jun-26 09:00 24-Jun-26 10:00 ATCO TE 2091s RTU/SCADA (2091s Thornton), 2091s Protection & Control (2091s Thornton) Thornton telecom - upgrading Thornton SAR to v21, then v22 1 Hour
Continuous		  
24-Jun-26 09:00 24-Jun-26 17:00 ALTALINK Outage 395s 174W (395s North Holden) 395s174W PRC5 breaker maintenance & first trip 8 Hours
Continuous		  
24-Jun-26 09:00 27-Jun-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) configuration update - ahead of Gaetz lines energization 80 Hours
Continuous		  
24-Jun-26 09:30 25-Jun-26 17:30 ATCO Outage 763s 602 (763s Hanna), 6L15 (763s Hanna - 775s Sullivan Lake), 775s 601 (775s Sullivan Lake) breaker min oil HLC partial testing 32 Hours
Continuous		  
24-Jun-26 09:30 24-Jun-26 16:30 ALTALINK Outage 338s 552 (338s Cherhill) 240kV breaker maintenance 7 Hours
Continuous		  
24-Jun-26 10:30 24-Jun-26 17:30 ALTALINK Outage 253s 182 (253s Blackie), 253s C1 (253s Blackie) 253s182 PRC5, major maint 7 Hours
Continuous		  
24-Jun-26 12:00 24-Jun-26 16:00 ATCO TE ATCO Telecom Equipment Cheecham telecom/Chard telecom - capacity & reliability upgrades 4 Hours
Continuous		  
24-Jun-26 12:00 24-Jun-26 17:00 ATCO RB 9L24 (946s Oakland - 959s Lanfine) repair OPGW damage on 9L24 at structure 231 5 Hours
Continuous		  
24-Jun-26 13:00 26-Jun-26 17:30 ATCO Outage 2029s ACF21 (2029s Heathfield), 2029s 1222 (2029s Heathfield) 2029s ACF21 - filter bank AC maintenance
2029s breaker 1222 - PRC-005 trip coil testing		 52.5 Hours
Continuous		  
25-Jun-26 07:00 10-Jul-26 17:00 ALTALINK, EPCOR Outage 1044L (EP 805s Jasper - 816s Petrolia), EP 805s J2404 (EP 805s Jasper), EP 805s J2403 (EP 805s Jasper), EP 805s J2408 (EP 805s Jasper), 805s C1 (805s Jasper) J2403 replacement LCR 370 Hours
Continuous		  
25-Jun-26 07:15 25-Jun-26 17:45 ALTALINK Outage 1112L (89s Ellerslie - 289s Saunders Lake) transmission line maintenance 10.5 Hours
Continuous		  
25-Jun-26 07:30 25-Jun-26 17:30 ALTALINK RB 1140L (89s Ellerslie - 289s Saunders Lake) safety requirement for proximity to 1112L 10 Hours
Continuous		  
25-Jun-26 08:00 25-Jun-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D86 protection outage - relays, lockout testing 8 Hours
Continuous		  
25-Jun-26 08:00 25-Jun-26 16:00 ALTALINK TE 510s RTU/SCADA (510s Sunnybrook) update the RTU and HMI configuration for new intrusion alarms 8 Hours
Continuous		  
25-Jun-26 09:00 25-Jun-26 17:00 ATCO Outage 7L08 (830s Carmon - 834s Wesley Creek), 830s 701T (830s Carmon), 830s 701TCS (830s Carmon) planned outage to change out double D.E arm at Str 99 outside Carmon substation 8 Hours
Continuous		  
25-Jun-26 09:00 25-Jun-26 16:00 ATCO TE 709s RTU/SCADA (709s Vegreville) PRC-006 UFLS settings update, alarm updates 7 Hours
Continuous		  
25-Jun-26 10:00 27-Jun-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) adjust the SPS1613 logic in both 9L93/9L16 relays to account for the two new transmission lines out of Tinchebray 55 Hours
Continuous		  
26-Jun-26 07:00 26-Jun-26 12:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s29 5 Hours
Continuous		  
26-Jun-26 08:00 27-Jun-26 16:00 ALTALINK TE 895s RTU/SCADA (895s Suffield) split the existing SCADA VLAN from 1 to 1 and 2 32 Hours
Continuous		  
26-Jun-26 12:00 26-Jun-26 17:00 ALTALINK TE 77s Protection & Control (77s Sagitawah) trip test 77s29 5 Hours
Continuous		  

Prepared On:   2026-06-17   15:57:35

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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