Alberta Electric System Operator
System Co-ordination Plan
2026-05-28 to 2026-06-05
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 05-Jun-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 2,066.25 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 05-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		  
13-Apr-26 07:00 29-May-26 17:00 EPCOR Outage 805s T4 (805s Jasper) bushing replacement and fan repair 1,114 Hours
Continuous		  
25-Apr-26 08:00 27-Jun-26 16:00 ENMAX Outage 1.82L (SS-1 - SS-5), 5B138-1.82 (SS-5) 1 sub Transmission line cut over 1,520 Hours
Continuous		  
25-Apr-26 08:00 27-Jun-26 16:00 ENMAX Outage 1.84L (SS-1 - SS-5), 5B138-1.84 (SS-5) 1 sub Transmission line cut over 1,520 Hours
Continuous		  
27-Apr-26 08:00 05-Jun-26 08:00 Saskpower Outage Sask Power CC904T maintenance 936 Hours
Continuous		 AB-SK
01-May-26 17:00 25-Nov-26 17:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 4,993 Hours
Continuous		  
06-May-26 08:00 01-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 50BF/700BS1 633.5 Hours
Continuous		  
06-May-26 08:00 01-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 87TA/701T 633.5 Hours
Continuous		  
06-May-26 08:00 01-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 51MV/701T 633.5 Hours
Continuous		  
06-May-26 08:00 01-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 51HV-51N/701T 633.5 Hours
Continuous		  
11-May-26 08:00 29-May-26 16:00 ALTALINK TE 1182s RTU/SCADA (1182s Berland River) RTU outage required for SCADA deficiency clean-up and SCN testing 440 Hours
Continuous		  
11-May-26 18:00 08-Jun-26 08:00 ATCO, ALTALINK Outage 962L (87s Gaetz - 972s Tinchebray) switch needs to remain open until ATCO is ready @ 972s for energization 662 Hours
Continuous		  
11-May-26 18:00 08-Jun-26 08:00 ATCO, ALTALINK Outage 986L (87s Gaetz - 972s Tinchebray) switch needs to remain open until ATCO is ready @ 972s for energization 662 Hours
Continuous		  
12-May-26 08:00 29-May-26 17:00 ATCO TE ATCO RTU/SCADA firewall firmware upgrades at the Primary Control Center and the Secondary Control Center
potential activity due to firmware upgrades, firewall failovers, and site cutover activities		 417 Hours
Continuous		  
13-May-26 15:30 29-Jun-26 18:00 ATCO Outage 813s SVC (813s Little Smoky), 813s 719 (813s Little Smoky) forced outage 1,130.5 Hours
Continuous		  
19-May-26 07:00 01-Jun-26 07:00 EPCOR Outage T1 (Rossdale), 814s T2 (814s Bellamy), R721 (Rossdale), BR722 (Rossdale) LCR demo 312 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		  
19-May-26 09:00 29-May-26 17:00 ATCO, GREENGATEP Outage 9L16 (755s Cordel - 972s Tinchebray), 755s 905 (755s Cordel), 755s 904 (755s Cordel), 972s 908 (972s Tinchebray), 972s 909 (972s Tinchebray) disconnect 9L16 from existing A-frame deadend and 9L16D2 (to be renamed 9L86D1)
restore bus leave renamed 9L86D1 open for future line connection
 248 Hours
Continuous		  
19-May-26 09:00 29-May-26 17:00 ATCO TE 755s Protection & Control (755s Cordel), 755s RTU/SCADA (755s Cordel) protection updates and end to end testing 248 Hours
Continuous		  
19-May-26 09:00 29-May-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray), 972s RTU/SCADA (972s Tinchebray) 9L16 protection setting changes including updates at 755s and 620s 248 Hours
Continuous		  
19-May-26 09:00 29-May-26 17:00 ATCO, CapitalPower TE 620s 240kV Bus (620s Goldeye), 620s Protection and Control (620s Goldeye) protection updates and testing at 620S Goldeye - 9L16 3 terminal testing between Cordel-Goldeye-Tinchebray 248 Hours
Continuous		  
20-May-26 07:00 28-May-26 17:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) 275s Jenner RTU update for switch replacement 202 Hours
Daily		  
20-May-26 09:00 28-May-26 17:00 ALTALINK Outage 275s T2 (275s Jenner), 275s 46 (275s Jenner), 275s 2252 (275s Jenner) maintenance 200 Hours
Continuous		  
21-May-26 07:00 30-May-26 17:30 ALTALINK, EPCOR RB 909L (310p Sundance - 665s Dome) 909LW: Reclose Block required by Altalink 226.5 Hours
Continuous		  
21-May-26 07:15 30-May-26 17:45 ALTALINK Outage 1202L (89s Ellerslie - 320p Keephills) urgent repair, transmission line maintenance 226.5 Hours
Continuous		  
21-May-26 07:30 30-May-26 17:30 ALTALINK, EPCOR RB 909L (310p Sundance - 665s Dome) safety requirement for 1202L GOI 226 Hours
Continuous		  
22-May-26 07:15 28-May-26 17:45 ALTALINK Outage 890L (58s Edson - 207s Pinedale), 58s 890 (58s Edson), 207s 890 (207s Pinedale) transmission line maintenance 154.5 Hours
Continuous		  
24-May-26 07:30 28-May-26 15:00 CMH Outage MHS-3 MH69-T31 (MHS-3 South Ridge), MHS-3 MH69-311 (MHS-3 Southridge) outage to facilitate reconditioning oil for transformer MH69-T31 at MHS-3S Southridge Substation 103.5 Hours
Continuous		  
25-May-26 07:00 05-Jun-26 17:00 EPCOR Outage 987s T4 (987s Clover Bar), 987s C2408 (987s Clover Bar) DGA monitor replacement and relay maintenance 274 Hours
Continuous		  
25-May-26 07:00 28-May-26 17:00 EPCOR Outage 72MG16 (Garneau - Meadowlark), M725 (Meadowlark), G721 (Garneau), G726 (Garneau) MG16/Meadowlark: CVT/SA doble and MDS10 disconnect maintenance 82 Hours
Continuous		  
25-May-26 07:00 28-May-26 17:00 EPCOR TE 72MG16 (Garneau - Meadowlark) channel 2 outage - FO-03 fiber repair 82 Hours
Continuous		  
25-May-26 08:00 28-May-26 16:00 ATCO RB 7L03 (749s Flyingshot Lake - 7L09 tap), 7L03 (731s Elmworth - 7L09 tap) walk up and climbing inspection 80 Hours
Continuous		  
25-May-26 08:00 28-May-26 16:00 ALTALINK TE 183s RTU/SCADA (183s Underwood), AltaLink Telecom Equipment firewall replacement, LAN switch replacement and 7705A node upgrade 80 Hours
Continuous		  
25-May-26 08:00 29-May-26 18:00 ALTALINK RB 601L (230s Wardlow - 275s Jenner) overhead reties and insulator replacements 106 Hours
Daily		  
25-May-26 08:00 05-Jun-26 14:30 CMH, TCPL TE MH-65L (MHS-7 Brier Park - Cancarb Energy Medicine Hat) maintenance on the LDR-65L-A 270.5 Hours
Continuous		  
25-May-26 08:00 28-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 167s RTU/SCADA (167s Ipiatik Lake) firewall replacement, LAN switch replacement, raw socket conversion, MPLS 7705A and 7705B upgrade 80 Hours
Continuous		  
25-May-26 08:00 11-Jun-26 16:00 ALTALINK, Travers2SolarLP TE 102s Protection & Control (102s Langdon), 991s Protection & Control (991s Little Bow) settings changes, circuit cutovers and testing associated with the DLR project 416 Hours
Continuous		  
25-May-26 08:00 11-Jun-26 16:00 ALTALINK TE 102s RTU/SCADA (102s Langdon) configuration changes and testing associated with the DLR project 416 Hours
Daily		  
25-May-26 08:00 28-May-26 16:00 ENMAX Outage 3.4TR (SS-3) transformer power factor test, secondary cable test, maintenance, relay fault pressure test, oil sampling TC 80 Hours
Continuous		  
25-May-26 08:00 28-May-26 16:00 ENMAX Outage 35.1TR (SS-35) transformer power factor test, secondary cable test, maintenance, relay fault pressure test, reversing switch check, oil sampling 80 Hours
Continuous		  
25-May-26 08:00 28-May-26 16:00 ENMAX TE Protection & Control (SS-16) 16 sub 69kV Bus Z21 differential protection outage. 16.1TR, 16.2TR CT terminal blk replacement 80 Hours
Daily		  
25-May-26 08:00 29-May-26 16:00 ENMAX Outage 32.3TR (SS-32) replace two interlock modules and a switchgear inspection 104 Hours
Continuous		  
25-May-26 08:00 28-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment firewall replacement, MPLS 7705A and 7705B upgrade 80 Hours
Continuous		  
25-May-26 09:00 29-May-26 16:00 ATCO TE ATCO Telecom Equipment weberville_t-telecom/deadwood_t-telecom- eol radio replacement Deadwood to webberville 103 Hours
Continuous		  
25-May-26 10:00 05-Jun-26 17:30 ATCO TE 2029s Protection & Control (2029s Heathfield) 10BL04.07 and R1-F871 (12L85) relay firmware upgrade 271.5 Hours
Continuous		  
25-May-26 10:00 28-May-26 18:00 ALTALINK Outage 276s 775X (276s Prentiss), 775L (276s Prentiss - 535s Joffre) north crew will be doing component replacement on 759L77-139 80 Hours
Continuous		  
25-May-26 10:00 28-May-26 17:00 ALTALINK Outage 276s 759W (276s Prentiss), 759L (87s Gaetz - 276s Prentiss) component replacement on 759L77-139 79 Hours
Continuous		  
25-May-26 11:30 28-May-26 16:00 ALTALINK TE 63s RTU/SCADA (63s Red Deer) upgrade firmware versions on A & B RTU units 76.5 Hours
Daily		  
25-May-26 12:00 28-May-26 17:00 ALTALINK TE 394s RTU/SCADA (394s Empress) supervisory/SCADA outage to replace T4 metering equipment 77 Hours
Continuous		  
25-May-26 13:30 28-May-26 17:00 ALTALINK Outage 77s T1 (77s Sagitawah) PRC5 transformer maintenance, doble, leak repair & IDD replacement 75.5 Hours
Continuous		  
25-May-26 14:00 06-Jun-26 17:00 ALTALINK Outage 925L (63s Red Deer - 74s Janet), 63s 352 (63s Red Deer), 63s 252 (63s Red Deer), 63s 925X (63s Red Deer) 63s352 breaker replacement to SF6 breaker 291 Hours
Continuous		  
26-May-26 07:00 28-May-26 18:00 ALTALINK Outage 727L (678s Okotoks - 727AL tap), 678s 727 (678s Okotoks) replacing cross arms and insulators on structures 63, 66, 67, 72, 73 and 76 59 Hours
Continuous		  
26-May-26 08:00 28-May-26 18:00 ALTALINK TE APS# 36 Garden City 226s WAGF Trip Scheme blocking RAS36 in the relays so the power remains available for the maintenance work 58 Hours
Continuous		  
26-May-26 09:00 28-May-26 12:00 ALTALINK Outage 394s T4 (394s Empress), 394s 41 (394s Empress) 394sT4 replace CT8 51 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 07:00 01-Jun-26 17:00 ALTALINK, EPCOR RB 430L (330P Genesee - 510S Sunnybrook) aerial washing program 130 Hours
Continuous		  
27-May-26 07:00 29-May-26 17:30 ALTALINK, EPCOR RB 430L (330P Genesee - 510S Sunnybrook) aerial washing program 58.5 Hours
Continuous		  
27-May-26 08:00 28-May-26 17:00 ALTALINK Outage 618s 863X (618s Riverbend), 863L (618s Riverbend - 891L tap) 863L replacing insulators on structures 157, 158, 159, 160, 161, and 162 33 Hours
Continuous		  
27-May-26 08:00 21-Jun-26 16:00 Syncrude Outage 334 (Syncrude Mildred Lake), 335 (Syncrude Mildred Lake), 3235 (Syncrude Mildred Lake), Mildred T3 (Syncrude Mildred Lake), 234 (Syncrude Mildred Lake), 235 (Syncrude Mildred Lake), 2235 (Syncrude Mildred Lake), Mildred T2 (Syncrude Mildred Lake), Mildred T1 (Syncrude Mildred Lake), 135 (Syncrude Mildred Lake), 134 (Syncrude Mildred Lake), 1335 (Syncrude Mildred Lake), Mildred T16 (Syncrude Mildred Lake), 1635 (Syncrude Mildred Lake), 1634 (Syncrude Mildred Lake), 1434 (Syncrude Mildred Lake), 1435 (Syncrude Mildred Lake), Mildred T14 (Syncrude Mildred Lake), 1934 (Syncrude Mildred Lake), 1935 (Syncrude Mildred Lake), Mildred T19 (Syncrude Mildred Lake), ML1 (D05 - Syncrude Mildred Lake), 914 (Syncrude Mildred Lake), 915 (Syncrude Mildred Lake), 916 (Syncrude Mildred Lake), 814 (Syncrude Mildred Lake), 815 (Syncrude Mildred Lake), 816 (Syncrude Mildred Lake), 1224A (Syncrude Mildred Lake), 1224B (Syncrude Mildred Lake), 1225 (Syncrude Mildred Lake), D05 76 (D05), D05 75B (D05), D05 76A (D05) plant 31 6-year 72 kV "B" bus maintenance 608 Hours
Continuous		  
27-May-26 08:00 28-May-26 16:00 ENMAX, ALTALINK Outage 24.83L (74s Janet - SS-24), 74s 24.83X (74s Janet) HV breaker maintenance, 24B138-24.83 breaker racking support install 32 Hours
Continuous		  
27-May-26 08:00 28-May-26 16:00 ENMAX, ALTALINK IO 24.83L (74s Janet - SS-24) HV breaker maintenance. 24B138-24.83 breaker racking support install 32 Hours
Continuous		  
27-May-26 08:00 28-May-26 16:00 ENMAX Outage 11.4TR (SS-11) tap changer inspection - 11.4-TC, reversing switch check 32 Hours
Continuous		  
27-May-26 08:00 28-May-26 16:00 ENMAX Outage 16.2TR (SS-16) 16.2TR CT terminal block replacement 32 Hours
Continuous		  
27-May-26 09:00 29-May-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) updating 9L59, 9L93 and 9L16 relays 56 Hours
Continuous		  
27-May-26 10:00 28-May-26 16:00 ATCO Outage 715s 702 (715s Leming Lake), 7L91 (715s Leming Lake - 826s Marguerite Lake) PRC-005 trip coil testing, CT inspection/testing 30 Hours
Continuous		  
27-May-26 23:00 28-May-26 07:00 ATCO TE ATCO Telecom Equipment, 810s RTU/SCADA (810s Dome Cutbank), 728s RTU/SCADA (728s Mercer Hill), 865s RTU/SCADA (865s Saddlehills), 2085s RTU/SCADA (2085s Sheridan), 733s RTU/SCADA (733s Simonette), 862s RTU/SCADA (862s South Bezanson), 785s RTU/SCADA (785s Judy Creek Gas Plant), 854s RTU/SCADA (854s Swan Dive), 824s RTU/SCADA (824s Fieldgate), 829s RTU/SCADA (829s Boucher Creek), 783s RTU/SCADA (783s Cadotte River), 830s RTU/SCADA (830s Carmon), 779s RTU/SCADA (779s Chinchaga River), 839s RTU/SCADA (839s Daishowa), 855s RTU/SCADA (855s Hamburg), 797s RTU/SCADA (797s Kemp River), 812s RTU/SCADA (812s Norcen), 795s RTU/SCADA (795s Zama) upgrading mobile network 8 Hours
Continuous		  
28-May-26 07:00 30-May-26 17:00 EPCOR Outage 816s P2405 (816s Petrolia) P2405 CT doble 58 Hours
Continuous		  
28-May-26 07:30 28-May-26 11:30 EPCOR Outage 524s T1 (524s Owens Corning) maintenance 4 Hours
Continuous		  
28-May-26 07:30 31-May-26 15:00 CMH Outage MHS-5 MH69-T51 (MH69s5 NE Crescent Height), MHS-5 MH69-505 (MHS-5 NE Crescent Heights) reconditioning oil for transformer MH69-T51 at MHS-5S Northeast Crescent Heights substation 79.5 Hours
Continuous		  
28-May-26 08:00 28-May-26 16:00 ALTALINK TE 396s RTU/SCADA (396s Pincher Creek), AltaLink Telecom Equipment MPLS node A investigation and possible replacement 8 Hours
Continuous		  
28-May-26 08:00 28-May-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D88 protection outage - relays, lockout testing 8 Hours
Continuous		  
28-May-26 08:30 28-May-26 17:00 ALTALINK TE 293s Protection & Control (293s Bernese), 38s Protection & Control (38s East Edmonton) standard relay maintenance 8.5 Hours
Continuous		  
28-May-26 08:30 28-May-26 17:00 ALTALINK TE 293s Protection & Control (293s Bernese), 38s Protection & Control (38s East Edmonton) standard relay maintenance 8.5 Hours
Continuous		  
28-May-26 09:00 28-May-26 11:00 ATCO Outage 898s 501R (898s Heart Lake) PRC-005 trip coil testing
2 Hours
Continuous		  
28-May-26 09:00 28-May-26 16:00 ATCO TE ATCO Telecom Equipment, 892s RTU/SCADA (892s Ribstone Creek) Aprisa radio major maintenance 7 Hours
Continuous		  
28-May-26 11:01 28-May-26 13:00 ATCO, ALTALINK Outage 788L (898s Heart Lake - 788AL tap), 898s 708 (898s Heart Lake), 898s 788LD2 (898s Heart Lake) PRC-005 trip coil testing 1.98 Hours
Continuous		  
29-May-26 08:00 29-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 250p RTU/SCADA (250P Bighorn Plant) remote upgrade 7705HM to correct a mis-configuration of the existing service 8 Hours
Continuous		  
29-May-26 08:00 29-May-26 17:00 ALTALINK Outage 792L (150s Clyde - 191s N.W. Cardiff), 150s 792X (150s Clyde), 191s 792N (191s N.W. Cardiff) 792L413 tower repairs
9 Hours
Continuous		  
29-May-26 08:00 29-May-26 16:00 ENMAX TE Protection & Control (SS-11) 11PT138-Z31 outage - power factor test - 11PT138-Z31 8 Hours
Continuous		  
29-May-26 09:00 02-Jun-26 20:00 SUNCOR Outage 29PL9-3 (29EDD-1 Millennium - 29EDD-3), 29EDD-1 29EDD1S11 (29EDD-1 Millennium), 29PS-16 (29EDD-3), 29EDD-1 29EDD1s552 (29EDD-1 Millennium), 29EDD-1 29EDD1SPL9-3 (29EDD-1 Millennium), 29EDD-1 29EDD1s652 (29EDD-1 Millennium), 29EDD-3 29PT-6 (29EDD-3) 29EDD-1 29EDD1S11 - repair broken switch
29EDD1;29CVT-4 system - protection testing, breaker trip testing		 107 Hours
Continuous		  
30-May-26 08:00 02-Jun-26 16:00 SUNCOR TE 29EDD-34 RTU/SCADA (29EDD-34) add duplicate power sources 80 Hours
Continuous		  
30-May-26 09:00 13-Jun-26 17:00 ATCO, ALTALINK Outage 972s 906 (972s Tinchebray), 972s 905 (972s Tinchebray), 9L62 (87s Gaetz - 972s Tinchebray) connect new 9L62 to 972S and prepare to energize, string conductors 9L62 from str #3 to substation to 9L62D1, coordinate with AML conductor jumpers and termination at 9L86 Str 409 344 Hours
Continuous		  
31-May-26 08:00 31-May-26 12:00 ENMAX Outage 15.60L (SS-15 - SS-21), 15.1TR (SS-15), 15B69-15.60 (SS-15), SW63 (SS-15), 15MD69-15.1TR (SS-15) summer substation washing, reversing switch check 4 Hours
Continuous		  
31-May-26 12:01 31-May-26 18:00 ENMAX Outage 15.62L (SS-15 - SS-16), 15.2TR (SS-15), 15B69-15.62 (SS-15), SW64 (SS-15) summer substation washing, reversing switch check 5.98 Hours
Continuous		  
01-Jun-26 06:30 05-Jun-26 17:30 ALTALINK RB 809L (320p Keephills - 510s Sunnybrook) 809L - reclose block for aerial washing program 107 Hours
Continuous		  
01-Jun-26 07:00 03-Jun-26 17:00 EPCOR Outage 816s P2406 (816s Petrolia) petrolia: P2406 CT doble 58 Hours
Continuous		  
01-Jun-26 07:00 07-Jun-26 17:00 EPCOR Outage 72PM25 (Poundmaker - Meadowlark), T4 (Poundmaker), PM721 (Poundmaker), PM2402 (Poundmaker), PM2403 (Poundmaker), M726 (Meadowlark), PMAB4 (Poundmaker) tx4 doble and PMAB4/PMDS4/PMDS5 disconnect maintenance 154 Hours
Continuous		  
01-Jun-26 07:00 10-Feb-27 17:00 EPCOR Outage T1 (Rossdale) rossdale: TX1 lcr civil 6,107 Hours
Continuous		  
01-Jun-26 07:00 05-Jun-26 17:00 ALTALINK RB 809L (320p Keephills - 510s Sunnybrook) 809L - reclose block for aerial washing program 106 Hours
Continuous		  
01-Jun-26 07:00 05-Jun-26 17:00 EPCOR Outage T1 (EP Riverview) riverview: TX1 secondary cabinet venting install 106 Hours
Continuous		  
01-Jun-26 07:00 04-Jun-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) RTU/HMI change for 962L CETO project 82 Hours
Daily		  
01-Jun-26 07:30 01-Jun-26 18:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) attach temporary bypass 11 Hours
Daily		  
01-Jun-26 07:30 11-Jun-26 09:30 ALTALINK, EPCOR Outage 930L (37s North Calder - Poundmaker), 37s 76 (37s North Calder), 37s 81 (37s North Calder), 37s 71 (37s North Calder), PMDS10 (Poundmaker), 37s Protection & Control (37s North Calder) protection upgrade (37s76, 37s72, 37s81, 37s86) 242 Hours
Continuous		  
01-Jun-26 07:30 04-Jun-26 15:00 CMH Outage MHS2 MH69-T21 (MHS-2 North Industrial), MHS-2 MH69-206 (MHS-2 North Industrial) outage to facilitate reconditioning oil for transformer MH69-T21 at MHS-2S North Industrial Substation 79.5 Hours
Continuous		  
01-Jun-26 08:00 01-Jun-26 18:00 ATCO Outage 7L760 (7LA760 tap - 7LC760 tap) Outage required install 7L760/7LA760 junction temporary temp. bypass. J1 and J2 will be created during this outage.
J1 will be used as an isolation point for bypassing existing line switches 7LA760D1, 7L760D4, 7L760D6 for switch replacements.
At the end of this permit, J1 will be closed and J2 will		 10 Hours
Continuous		  
01-Jun-26 08:00 03-Jun-26 18:00 ATCO, ALTALINK RB 7L760 (767s Oyen - 7LC760 tap), 7L760 (7LA760 tap - 7LC760 tap), 760L (760AL tap - 7LA760 tap) connect the attach slack span to from temporary bypass to new vertical DE on 7LA760, jumpers from the bypass to 7LA760 vertical DE will remain open, and designated as J2 58 Hours
Continuous		  
01-Jun-26 08:00 01-Jun-26 16:00 ALTALINK TE 332s RTU/SCADA (332s Ellis) split the existing SCADA VLAN from 1 to 1 and 2 8 Hours
Continuous		  
01-Jun-26 08:00 01-Jun-26 12:00 ENMAX Outage 41.84L (SS-41 - SS-54), 54B138-41.84 (SS-54), 41B138-41.84 (SS-41) hv breaker SF6 gas sample - 54B138-41.84 4 Hours
Continuous		  
01-Jun-26 08:00 04-Jun-26 16:00 ALTALINK TE 15s RTU/SCADA (15s Fort Macleod), AltaLink Telecom Equipment Firewall Replacement + MPLS 7705A&B Upgrade. Some TPR channel will be OOS for 2hrs while redundant TPR circuits will remain in service. AIS1139 loss of signal for
2hrs - no redundancy. 528s and 15s supervisory circuit will be OOS for 2 hours on June 2nd between 11:00 - 13:00.		 80 Hours
Continuous		  
01-Jun-26 08:00 05-Jun-26 16:00 ALTALINK IO 74s Protection & Control (74s Janet) enmax work, 37.82L a&b protection outage 824 Hours
Continuous		  
01-Jun-26 08:00 05-Jun-26 16:00 ENMAX, ALTALINK TE 37.82L (74s Janet - SS-37) 37.82L A and B Protection Outage. Relays End to End Test -138-37.82-GE, 138-37.82L-SEL. Protection Test 37RLY138-37.82L-GE, SEL, 74SRLY138-37.82L-GE, SEL. Back-up fault clearing time 5.5 cycles. 104 Hours
Continuous		  
01-Jun-26 08:00 04-Jun-26 16:00 ENMAX Outage 32.2TR (SS-32) transformer power factor test, maintenance, relay fault pressure test, oil sampling MT, TC 80 Hours
Continuous		  
01-Jun-26 08:00 04-Jun-26 16:00 ENMAX Outage 35.2TR (SS-35) transformer power factor test, secondary cable test, maintenance, relay fault pressure test, reversing switch check, oil sampling MT, TC 80 Hours
Continuous		  
01-Jun-26 08:00 11-Jun-26 13:00 ALTALINK, EPCOR RB 920L (37s North Calder - 557s Castle Downs) 920LW - reclose block for Altalink working on 37s North Calder 245 Hours
Continuous		  
01-Jun-26 08:00 11-Jun-26 09:00 ALTALINK, EPCOR RB 930L (37s North Calder - Poundmaker) 930L - reclose block for Altalink working on 37s North Calder 241 Hours
Continuous		  
01-Jun-26 08:00 11-Jun-26 09:00 ALTALINK, EPCOR IO 930L (37s North Calder - Poundmaker) 930L outage: Altalink working on 37s North Calder 241 Hours
Continuous		  
01-Jun-26 08:00 11-Jun-26 16:00 ALTALINK TE 102s Protection & Control (102s Langdon) protection outages required for 'B' DC distribution cutover 248 Hours
Continuous		  
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 01-Jun-26 10:00 ATCO TE ATCO Telecom Equipment Goodfare_S-Telecom- Upgrading Goodfare Sub Net 1 SAR to v21, then v22
IMPACT TO THE FOLLOWING TRAFFIC FOR UP TO 1 HOUR: 7L07 A&B, ADVANTAGE OIL & GAS DTT, ELMWORTH NORTHSTONE DTT
 1 Hour
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		  
01-Jun-26 09:00 01-Jun-26 10:59 ATCO Outage 7L162 (729s Otauwau - 732s Mitsue), 729s 704 (729s Otauwau) breaker test 1.98 Hours
Continuous		  
01-Jun-26 09:00 02-Jun-26 17:30 ALTALINK, EPCOR RB 747L (37s North Calder - 711L tap), 747L (99s North St. Albert - 711L tap), 711L (113s Inland Cement - 747L tap) 711L - aerial washing program 32.5 Hours
Continuous		  
01-Jun-26 09:00 02-Jun-26 17:05 ALTALINK, BCH Outage 48s 887X (48s Pocaterra), 887L (48s Pocaterra - 978s BCH Britt Creek) bc hydro has Line switch inspections on: 1D1L274, 1D2L274, 1D3L274, 1D4L274, 1D5L274, 1D6L274
32.08 Hours
Continuous		  
01-Jun-26 09:30 02-Jun-26 17:00 ALTALINK, EPCOR RB 711L (113s Inland Cement - 747L tap) aerial washing program 31.5 Hours
Continuous		  
01-Jun-26 09:30 02-Jun-26 17:30 ATCO Outage 6L09 (763s Hanna - 776s Richdale), 763s 603 (763s Hanna) breaker min oil hlc partial testing 32 Hours
Continuous		  
01-Jun-26 10:00 02-Jun-26 16:00 ATCO Outage 715s 703 (715s Leming Lake), 7L66 (715s Leming Lake - 717s Ethel Lake) PRC-005 Trip Coil Testing, 703CT Inspection/ Testing 30 Hours
Continuous		  
01-Jun-26 10:00 01-Jun-26 11:00 ATCO TE ATCO Telecom Equipment, 815s RTU/SCADA (815s Goodfare), 731s RTU/SCADA (731s Elmworth), 886s RTU/SCADA (886s Updike), 823s RTU/SCADA (823s Wapiti) upgrading saskatoon mountain tower sar to V21, then V22
 1 Hour
Continuous		  
01-Jun-26 10:00 04-Jun-26 18:00 ALTALINK Outage 408L (51s Wainwright - 252s Jarrow), 51s 408N (51s Wainwright), 252s 408 (252s Jarrow) 408L change str 87 and 90 80 Hours
Continuous		  
01-Jun-26 10:00 02-Jun-26 17:00 ATCO TE 763s Protection & Control (763s Hanna) replace 50BF/603 rtxp during GOI 2-106390 breaker maintenance 31 Hours
Continuous		  
01-Jun-26 11:00 01-Jun-26 16:00 ATCO, CNRL TE ATCO Telecom Equipment, 957s McClelland, 2005s Secord, 838s Horizon Mining radio major on constellation link joslyn to bitumont. link will be down for 4 hours 11am-3pm.
 5 Hours
Continuous		  
01-Jun-26 11:00 01-Jun-26 12:59 ATCO Outage 7L49 (729s Otauwau - 732s Mitsue), 732s 7L49D1 (732s Mitsue) breaker testing 1.98 Hours
Continuous		  
01-Jun-26 12:00 04-Jun-26 11:00 ALTALINK Outage 74s C2 (74s Janet), 74s C1 (74s Janet) 74s54 74s56 major maintenance, 74sC1 + C2 weed spraying 71 Hours
Continuous		  
01-Jun-26 12:01 01-Jun-26 16:00 ENMAX Outage 54.81L (SS-54 - SS-65), 54B138-54.81 (SS-54), 65MD138-54.81 (SS-65) hv breaker SF6 gas sample - 54B138-54.81 3.98 Hours
Continuous		  
01-Jun-26 12:30 05-Jun-26 11:30 ALTALINK Outage 650s SVC (650s Hansman Lake) svc maintenance 95 Hours
Continuous		  
01-Jun-26 12:30 03-Jun-26 17:00 ALTALINK Outage 677L (305s Acheson - 595s Spruce Grove), 305s 677 (305s Acheson), 595s 677 (595s Spruce Grove) 305s677 PRC5 breaker maintenance 52.5 Hours
Continuous		  
01-Jun-26 13:00 01-Jun-26 14:00 ATCO TE ATCO Telecom Equipment, ATC 803s RTU/SCADA (ATC 803s Bullpound) bullpound_s-telecom- upgrading bullpound sub net 2 sar to v21, then v22
, 7L85 breaker fail		 1 Hour
Continuous		  
01-Jun-26 13:30 01-Jun-26 17:00 ALTALINK Outage 283s T2 (283s Violet Grove), 283s 489 (283s Violet Grove) 25 kV bus maintenance
3.5 Hours
Continuous		  
02-Jun-26 07:00 03-Jun-26 18:00 ALTALINK TE AltaLink Telecom Equipment, 944L (132s Ware Junction - 275s Jenner) Tower re-alignment at 1080S Raptor, requires 944L outage and 1080s offline 35 Hours
Continuous		  
02-Jun-26 07:00 03-Jun-26 17:00 ALTALINK Outage 944L (132s Ware Junction - 275s Jenner) Telecom SIA specifies that a 944L and 944AL outage is required for dish realignment. Both A and B protections will be out of service. 1080s Will be offline.
34 Hours
Continuous		  
02-Jun-26 07:00 03-Jun-26 17:00 ALTALINK Outage 150s 792X (150s Clyde) CT Testing on CTs associated with 150s792X Breaker (CT4). 34 Hours
Continuous		  
02-Jun-26 07:00 03-Jun-26 17:00 ALTALINK RB 551L (123s Banff - 945s Sunshine Village) line maintenance 34 Hours
Continuous		  
02-Jun-26 07:00 03-Jun-26 17:00 ALTALINK RB 551L (953s Lake Louise - 551GL tap) 551L 265-266 woodpecker inspection 34 Hours
Continuous		  
02-Jun-26 07:30 02-Jun-26 17:00 ALTALINK Outage 283s 31 (283s Violet Grove) CT testing 9.5 Hours
Continuous		  
02-Jun-26 07:30 03-Jun-26 16:30 ALTALINK RB 757L (17s Benalto - 758L tap), 757L (297s Rimbey - 758L tap), 758L (534s Eckville - 757L tap) 758L/757L proximity RB for offloading materials 33 Hours
Daily		  
02-Jun-26 07:30 02-Jun-26 17:30 ALTALINK Outage 242s T1 (242s Flat Lake) replace damaged 4.16kV bus CT 10 Hours
Continuous		  
02-Jun-26 08:00 02-Jun-26 16:00 ALTALINK TE 131s RTU/SCADA (131s Moon Lake), 235s RTU/SCADA (235s Entwistle), 283s RTU/SCADA (283s Violet Grove), AltaLink Telecom Equipment perform radio maintenance and change to re-route ability of the circuits 8 Hours
Continuous		  
02-Jun-26 08:00 02-Jun-26 16:00 ALTALINK TE 235s RTU/SCADA (235s Entwistle), AltaLink Telecom Equipment radio maintenance 8 Hours
Continuous		  
02-Jun-26 08:00 02-Jun-26 16:00 ALTALINK TE 283s RTU/SCADA (283s Violet Grove) split the existing SCADA VLAN 8 Hours
Continuous		  
02-Jun-26 08:00 02-Jun-26 16:00 ATCO Outage 732s 704 (732s Mitsue) ASEA IMBD CT testing at 732s Mitsue - CT704 8 Hours
Continuous		  
02-Jun-26 08:00 02-Jun-26 12:00 ENMAX Outage 40.81L (SS-40 - SS-41), 41B138-40.81 (SS-41), 40B138-40.81 (SS-40) HV breaker SF6 gas sample - 41B138-40.81 4 Hours
Continuous		  
02-Jun-26 08:00 04-Jun-26 18:00 ALTALINK, RESC Outage 1012L (326s Murray Lake - 516s Forty Mile) programmed maintenance
58 Hours
Continuous		  
02-Jun-26 08:00 03-Jun-26 17:00 ATCO RB 840s McNeill Station climbing inspection and testing insulators 33 Hours
Continuous		  
02-Jun-26 09:00 02-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		  
02-Jun-26 09:00 03-Jun-26 16:00 ALTALINK Outage 498s T1 (498s Tilley) 498s9 PT replacement P+C support on site 31 Hours
Continuous		  
02-Jun-26 09:00 02-Jun-26 16:00 ATCO TE ATCO Telecom Equipment Radio Major IRU link to Stoney Mountain.
7L71A&B 848S / 718S
7L71A 848S / 2082S
9L23B 848S / 977S
9L01A 848S / 951S
9L112A DOVER / 951S
9L30A DOVER / 951S
9L85B 977S / 856S
9L32 & 9L101B 2005S / 957S
9L85B 856S / 977S		 7 Hours
Continuous		  
02-Jun-26 09:00 03-Jun-26 17:00 BCH RB 2L294 (BCH A. A. Lambert - BCH Cranbrook), 2L294 (BCH A. A. Lambert - BCH Nelway) tree removal 32 Hours
Daily		 AB-BC
02-Jun-26 09:15 02-Jun-26 12:30 ALTALINK Outage 852s 452 (T852s Round Hill) First trips testing, Breaker Maintenance & heater replacement 3.25 Hours
Continuous		  
02-Jun-26 09:15 02-Jun-26 16:30 ATCO, ALTALINK RB 9L47 (AML 852s Round Hill - 898s Heart Lake) reclosing disabled for Alatlink work at 852s 7.25 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. June 23 GOI expansion: Isolation points 705a, 605a, S7016, S7021, S7032, and 500D1 to allow replacement of 501A and 507/508 surge arrestors. Temp settings required on 5L231 before expanding GOI zone. June 24 Reduce GOI back to isolation points 705a, 605a, 501A. 990 Hours
Continuous		  
02-Jun-26 12:00 02-Jun-26 16:00 ENMAX Outage 41B138-41BT3 (SS-41) HV breaker SF6 gas sample - 41B138-BT3 4 Hours
Continuous		  
02-Jun-26 13:15 02-Jun-26 16:30 ALTALINK Outage 852s 552 (T852s Round Hill) First trips testing, Breaker Maintenance & heater replacement 3.25 Hours
Continuous		  
03-Jun-26 07:00 05-Jun-26 18:00 ALTALINK Outage 379s 185N (379s Shell Canada Waterton), 396s 185 (396s Pincher Creek), 185L (379s Shell Canada Waterton - 396s Pincher Creek) replacing cross arms and insulators 59 Hours
Continuous		  
03-Jun-26 07:00 03-Jun-26 19:00 ALTALINK Outage 183s T1 (183s Underwood) maintenance, doble, IDD repair and bird cover replacement 12 Hours
Continuous		  
03-Jun-26 07:00 03-Jun-26 17:00 EPCOR TE 805s RTU/SCADA (805s Jasper) Jasper - RTU outage, SCADA firmware updates 10 Hours
Continuous		  
03-Jun-26 07:30 03-Jun-26 17:00 ALTALINK Outage 283s 835E (283s Violet Grove), 835L (283s Violet Grove - 835AL tap) CT testing 9.5 Hours
Continuous		  
03-Jun-26 08:00 03-Jun-26 18:00 Syncrude TE Syncrude ICCP Outage SCADA - server update whole Syncrude visibility loss 10 Hours
Daily		  
03-Jun-26 08:00 03-Jun-26 16:00 ATCO Outage 732s 705 (732s Mitsue) ASEA IMBD CT testing at 732s Mitsue - CT705 8 Hours
Continuous		  
03-Jun-26 08:00 04-Jun-26 16:00 ENMAX Outage 15B69-15.62 (SS-15), 15.62L (SS-15 - SS-16) HV Breaker Maintenance 32 Hours
Continuous		  
03-Jun-26 08:00 03-Jun-26 10:00 ENMAX TE Protection & Control (SS-5) 5PT138-Z32 outage - 1 sub transmission line cut over, SW89 status commissioning 2 Hours
Daily		  
03-Jun-26 09:00 03-Jun-26 16:00 ATCO TE ATCO Telecom Equipment Weberville_T-Telecom/Wesley Creek_S-Telecom - IRU radio majors 7 Hours
Continuous		  
03-Jun-26 09:00 03-Jun-26 11:00 ATCO TE ATCO Telecom Equipment, 863s RTU/SCADA (863s Paintearth) UPGRADING PAINT EARTH NET 11 AND NET 2 SAR OS UPGRADES TO V21, THEN V22
2 SEPARATE OUTAGES, IMPACTING THE FOLLOWING TRAFFIC FOR UP TO 1 HOUR EACH:

OUTAGE 1:
PAINT EARTH SUB LOW BES SCADA
9L27 A – 863S/755S
9L948 A – 863S/650S

OUTAGE 2:
9L27 B - 863S/755S
9L948 B - 863S/650S
 2 Hours
Continuous		  
03-Jun-26 09:00 03-Jun-26 16:00 ATCO TE ATCO Telecom Equipment IMPACT TO THE FOLLOWING TRAFFIC DURING PM & UPGRADE:
7L71 A&B 718S/2082S
7L71 A 848S/2082S
9L85 A&B 856S/977S
7L194 A&B 2011S/2009S
7L36 A&B 2009S/820S
7L135 A&B 977S/820S
9L101 A 848S/951S
12L44 21LB1 ALT 939S/951S
9L07 B 2011S/951S
9L32 / 9L101 B 2005S/957S
9L112 A 888S/951S
9L30 A – 888S/951S
 7 Hours
Continuous		  
03-Jun-26 10:00 04-Jun-26 16:00 ATCO Outage 970s 703 (970s Bourque) breaker maintenance 30 Hours
Continuous		  
03-Jun-26 10:00 04-Jun-26 17:30 ATCO Outage 963s 701 (963s Coyote Lake), 7L128 (963s Coyote Lake - 7LA128 tap) breaker SF6 GL312 testing 31.5 Hours
Daily		  
03-Jun-26 12:00 03-Jun-26 16:30 ALTALINK Outage 305s C1 (305s Acheson) cap bank weed spraying required 4.5 Hours
Continuous		  
04-Jun-26 07:00 05-Jun-26 17:30 ENMAX TE Protection & Control (SS-5) 5 Sub 138kV Bus Differential Protection Z31. 1 sub Transmission line cut over. Fault clearing time 26.5 cycles. 34.5 Hours
Daily		  
04-Jun-26 07:00 05-Jun-26 17:30 ENMAX TE Protection & Control (SS-5) 5 Sub 138kV Bus Differential Protection Z32. 1 sub Transmission line cut over. Fault clearing time 26.5 cycles. 34.5 Hours
Continuous		  
04-Jun-26 07:00 05-Jun-26 17:00 ALTALINK Outage 150s 223N (150s Clyde) CT Testing on CTs associated with 150s223N Breaker (CT3). 34 Hours
Continuous		  
04-Jun-26 07:00 04-Jun-26 19:00 ALTALINK Outage 183s T2 (183s Underwood) maintenance and doble 12 Hours
Continuous		  
04-Jun-26 07:15 04-Jun-26 17:45 ALTALINK Outage 1206L (12s Heartland - 89s Ellerslie) Transmission line maintenance 10.5 Hours
Continuous		  
04-Jun-26 07:15 05-Jun-26 17:45 ALTALINK Outage 739L (14s Devon - 155s Blackmud) transmission line maintenance 34.5 Hours
Continuous		  
04-Jun-26 07:30 09-Jun-26 18:30 ALTALINK Outage 760L (163s Amoco Empress - 760AL tap), 163s 760N (163s Amoco Empress) GOI Required from 760L41 to J1 and J3 to replace all switches at the 7LA760/7L760 Junction.
Temporary bypass will be installed and used to keep 7LA760 energized.		 131 Hours
Continuous		  
04-Jun-26 07:30 04-Jun-26 17:00 ALTALINK Outage 283s 673 (283s Violet Grove) CT Testing 9.5 Hours
Continuous		  
04-Jun-26 07:30 04-Jun-26 17:30 ALTALINK RB 1212L (12s Heartland - 89s Ellerslie) safety requirement - 1206L outage 10 Hours
Continuous		  
04-Jun-26 07:30 04-Jun-26 16:30 ALTALINK, TRANSALTA, Lethbridge RB 725BL (240s McBride Lake - 725L tap), 725L (15s Fort MacLeod - 725BL tap), 725L (674s Bowron - 725BL tap) complete 725BL27 str 27, OHSW re-tie 9 Hours
Daily		  
04-Jun-26 07:30 04-Jun-26 18:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) attach temporary bypass 11 Hours
Daily		  
04-Jun-26 08:00 04-Jun-26 18:00 ATCO, ALTALINK RB 7L760 (767s Oyen - 7LC760 tap), 7L760 (7LA760 tap - 7LC760 tap), 760L (760AL tap - 7LA760 tap) connect temporary bypass (7L760/7LA760 junction) for GOI 2-98637, complete phasing checks, close J2
Open jumpers at 7LA760-3		 10 Hours
Continuous		  
04-Jun-26 08:00 09-Jun-26 18:00 ATCO Outage 7L760 (767s Oyen - 7LC760 tap), 6L09 (763s Hanna - 776s Richdale) 760L41 to J1 and J3 to replace all switches at the 7LA760/7L760 Junction.
Temporary bypass will be installed and used to keep 7LA760 energized.		 130 Hours
Continuous		  
04-Jun-26 08:00 04-Jun-26 16:00 ATCO Outage 732s 706 (732s Mitsue) ASEA IMBD CT Testing at 732s Mitsue - CT706 8 Hours
Continuous		  
04-Jun-26 08:00 04-Jun-26 16:00 ALTALINK TE 288s RTU/SCADA (288s Wolf Creek), 331s RTU/SCADA (331s Ponoka), AltaLink Telecom Equipment Repair radio. Loss of visibility of 288s and 331s for 4 hours in the timeframe indicated. TPR outage affecting 1083L, 910L will cause slow fault clearing - up to 21 cycles. 8 Hours
Continuous		  
04-Jun-26 09:00 04-Jun-26 10:00 ATCO TE ATCO Telecom Equipment UPGRADING IPIATIK A SAR OS TO V21, THEN V22
IMPACT TO THE FOLLOWING TRAFFIC FOR UP T 1 HOUR:
TPRCP222 / 9L55 &1085L B - MCMILLAN / ROUND HILL (AML)
TPRCP019 / 9L930 B - HEART LAKE / LEISMER (AML)
VIAEP008 - HEATHFIELD / CHARD ALTALINK EPIPE * PLEASE NOTIFY ALTALINK NOC
 1 Hour
Continuous		  
04-Jun-26 09:00 04-Jun-26 15:00 ATCO RB 7L90 (813s Little Smoky - 7LA90 tap), 7L90 (741s ATC Fox Creek - 7LA90 tap) change str 58 on 7L90 due to deficient crossarm 6 Hours
Continuous		  
04-Jun-26 09:30 04-Jun-26 12:30 ALTALINK Outage 74s 103 (74s Janet), 74s 102 (74s Janet), 74s C3 (74s Janet), 74s C4 (74s Janet) Weed spraying in cap bank fence. 3 Hours
Daily		  
04-Jun-26 10:00 04-Jun-26 12:00 ALTALINK TE AltaLink Telecom Equipment update configuration 2 Hours
Continuous		  
04-Jun-26 10:00 04-Jun-26 14:00 ALTALINK TE 65s RTU/SCADA (65s High River), AltaLink Telecom Equipment MPLS firmware upgrade 4 Hours
Continuous		  
04-Jun-26 12:00 04-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 902s up to 7L88 inside 865s Saddle Hills 5 Hours
Continuous		  
05-Jun-26 08:00 05-Jun-26 16:00 ENMAX Outage 33.83L (SS-33 - SS-41), 33B138-33.83 (SS-33), 41B138-33.83 (SS-41) shield wire replacement 8 Hours
Continuous		  
05-Jun-26 08:00 07-Jun-26 17:00 ATCO Outage 7L25 (768s Rowley - 802s Michichi Creek), 768s 704 (768s Rowley), 802s 707 (802s Michichi Creek) climbing inspection 57 Hours
Daily		  
05-Jun-26 08:00 06-Jun-26 17:00 ALTALINK Outage 818s T2 (818s Winefred) maintenance and doble 33 Hours
Continuous		  
05-Jun-26 08:00 05-Jun-26 18:00 ENMAX, ALTALINK Outage 693L (42s Sarcee - SS-10), 10.2TR (SS-10), 10B138-693 (SS-10), 42s 693 (42s Sarcee), SW84 (SS-10) power factor test - 10PT138-693, 10PT138-Z31
breaker trip circuit test - 10B138-693		 10 Hours
Continuous		  
05-Jun-26 08:00 05-Jun-26 18:00 ENMAX, ALTALINK IO 693L (42s Sarcee - SS-10) ENMAX - power factor test - 10PT138-693, 10PT138-Z31, breaker trip circuit test - 10B138-693 10 Hours
Continuous		  
05-Jun-26 08:00 08-Jun-26 16:00 ALTALINK TE 38s RTU/SCADA (38s East Edmonton) updating RTU configuration for 38s761N 80 Hours
Continuous		  
05-Jun-26 08:00 05-Jun-26 18:00 ENMAX Outage 31.84L (SS-31 - SS-32), 32.3TR (SS-32), 32B138-32BT5 (SS-32), 32B138-31.84 (SS-32), 31B138-31.84 (SS-31), 32MD138-32.3TR (SS-32), SW90 (SS-32) spring substation washing, reversing switch check - 32.3-TC 10 Hours
Continuous		  
05-Jun-26 09:00 05-Jun-26 11:00 ATCO TE ATCO Telecom Equipment, 2029s RTU/SCADA (2029s Heathfield) upgrading Heathfield AC (A), DC (A), and Heathfield telecom SARS to V21, then V22 2 Hours
Continuous		  
05-Jun-26 18:00 07-Jun-26 18:00 ALTALINK Outage 761L (38s East Edmonton - 71s Lamoureux), 731L (38s East Edmonton - 746L tap), 215L (38s East Edmonton - 215AL tap), 38s T3 (38s East Edmonton), 38s 761N (38s East Edmonton), 38s 731E (38s East Edmonton), 38s 215N (38s East Edmonton), 38s 62 (38s East Edmonton), 38s 4152 (38s East Edmonton), 38s 4252 (38s East Edmonton), 38s 75 (38s East Edmonton), 71s 761W (71s Lamoureux) install screw piles for T7 and T8, install 38s332, 38s4752 for new T7. 38s761N BF trips to breakers on 138 kV bus 2, replace gas gauge on 38s75 48 Hours
Continuous		  

Prepared On:   2026-05-27   16:02:37

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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