Alberta Electric System Operator
System Co-ordination Plan
2026-05-21 to 2026-05-29
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 735.25 Days
Continuous		  
23-Aug-24 13:45 21-May-26 14:29 ALTALINK Outage 157s C1 (157s Lac La Biche) forced outage 636.03 Days
Continuous		  
20-Mar-25 08:00 29-May-26 17:00 ALTALINK Outage 256s C1 (256s Harmattan) forced outage 435.38 Days
Continuous		  
25-Nov-25 17:46 18-Sep-26 18:00 ATCO Outage 876s 901T (876s Brintnell) forced outage oil leaking 296.97 Days
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 730.33 Days
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 241.29 Days
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 172.38 Days
Continuous		  
21-Jan-26 08:00 30-Oct-26 16:00 ENMAX Outage 5.7TR (SS-5) 25kV switchgear replacement 282.29 Days
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 156.29 Days
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 150.29 Days
Continuous		  
06-Mar-26 17:00 13-Nov-26 17:00 EPCOR Outage T1 (Woodcroft) woodcroft: TX1 LCR civil 252 Days
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 265.33 Days
Continuous		  
11-Mar-26 13:45 31-May-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 81.09 Days
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 100.17 Days
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 69.21 Days
Continuous		  
06-Apr-26 08:00 19-Jun-26 16:00 ALTALINK TE 37s RTU/SCADA (37s North Calder) RTU database updates 74.33 Days
Continuous		  
13-Apr-26 07:00 29-May-26 17:00 EPCOR Outage 805s T4 (805s Jasper) bushing replacement and fan repair 46.42 Days
Continuous		  
13-Apr-26 09:00 21-May-26 10:00 ALTALINK Outage 157s C1 (157s Lac La Biche) replace breaker and disconnect switch 38.04 Days
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 63.33 Days
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 63.33 Days
Continuous		  
27-Apr-26 08:00 28-May-26 08:00 Saskpower Outage Sask Power CC904T maintenance 31 Days
Continuous		 AB-SK
28-Apr-26 08:00 22-May-26 16:00 ENMAX TE Protection & Control (SS-32) 32 sub 138 kV autoswitching protection outage - HV switch replacement. MD-32.2TR, 32SW84, 32SW85, 32SW86, 32SW87, 32SW88 24.33 Days
Daily		  
28-Apr-26 08:30 22-May-26 14:00 ENMAX Outage 32.83L (SS-32 - SS-40), 26.81L (SS-26 - SS-32), 32.2TR (SS-32), 32.1TR (SS-32), 32B138-32BT5 (SS-32), 32B138-32.83 (SS-32), 32B138-26.81 (SS-32), 40B138-32.83 (SS-40), 26B138-26.81 (SS-26), 32MD138-32.1TR (SS-32), 32MD138-32.2TR (SS-32) HV SW replacement. MD-32.2TR, 32SW84, 32SW85, 32SW86, 32SW87, 32SW88 24.23 Days
Continuous		  
01-May-26 17:00 25-Nov-26 17:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 208.04 Days
Continuous		  
03-May-26 10:00 31-May-26 17:00 ATCO, ALTALINK Outage 9L960 (13s Deerland - 825s Whitefish Lake), 9L961 (13s Deerland - 825s Whitefish Lake) forced outage due to damaged structure
28.29 Days
Continuous		  
04-May-26 08:00 22-May-26 16:00 ENMAX TE Protection & Control (SS-5) 5PT138-Z31 secondary voltage outage, SS-1 transmission line cut over 18.33 Days
Daily		  
04-May-26 08:00 22-May-26 16:00 ENMAX TE Protection & Control (SS-5) 1 sub transmission line cut over 18.33 Days
Daily		  
04-May-26 10:00 25-May-26 16:00 ATCO TE 825s Whitefish Lake RTU/SCADA isolations and modifications to alarm/ SCADA points, wiring, and configurations, may require shot duration 21.25 Days
Continuous		  
06-May-26 08:00 01-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 50BF/700BS1 26.4 Days
Continuous		  
06-May-26 08:00 01-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 87TA/701T 26.4 Days
Continuous		  
06-May-26 08:00 01-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 51MV/701T 26.4 Days
Continuous		  
06-May-26 08:00 01-Jun-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay testing 51HV-51N/701T 26.4 Days
Continuous		  
11-May-26 07:00 22-May-26 17:00 EPCOR Outage 52s T1 (52s East Industrial), 52s E2401 (52s East Industrial) TX1 DGA monitor replacement 11.42 Days
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 18.33 Days
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 27.58 Days
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 27.58 Days
Continuous		  
12-May-26 08:00 25-May-26 16:00 Syncrude Outage 211 (Aurora), AL-1 (Aurora - D05), 213 (Aurora), 212B (Aurora), 213A (Aurora), 89-215 (Aurora), D05 520 (D05), D05 517 (D05), D05 519 (D05) zone 5 6yr PM 13.33 Days
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		 17.38 Days
Continuous		  
13-May-26 08:00 26-May-26 16:00 ATCO, CNRL, ALBIAN Outage 847s 902T (847s Muskeg River), 919s 908 (919s Hartley) open 908 breaker and 902TD in the Hartley 919S substation for maintenance 13.33 Days
Continuous		  
13-May-26 15:30 22-May-26 18:00 ATCO Outage 813s SVC (813s Little Smoky), 813s 719 (813s Little Smoky) forced outage 9.1 Days
Continuous		  
15-May-26 09:00 25-May-26 17:00 BCH, ALTALINK Outage 2L113 (BCH Cranbrook - BCH Natal), 2D23 (BCH Nelway), 2D21 (BCH Natal), 1D22 (BCH Elkford tap) install marker balls 10.33 Days
Continuous		 AB-BC
18-May-26 08:00 22-May-26 16:00 CMH TE MHS-7 Protection & Control (MHS-7 Brier Park) perform preventative maintenance on BPR-69-B 4.33 Days
Continuous		  
18-May-26 08:00 27-May-26 16:00 ENMAX Outage 1.5TR (SS-1) connect transformer secondary cables to 1B8-1.5TR 9.33 Days
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 13 Days
Continuous		  
19-May-26 07:00 21-May-26 17:00 EPCOR Outage S723 (Strathcona) S723 (SF6) breaker maintenance and CT doble 2.42 Days
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 101.42 Days
Continuous		  
19-May-26 07:30 21-May-26 17:30 ALTALINK RB 759L (87s Gaetz - 276s Prentiss) prep for component replacement on 759L77-139 2.42 Days
Daily		  
19-May-26 07:30 21-May-26 17:30 ALTALINK RB 775L (276s Prentiss - 535s Joffre) prep for component replacement on 759L77-139 2.42 Days
Daily		  
19-May-26 07:30 23-May-26 15:00 CMH Outage MHS-3 MH69-T32 (MHS-3 Southridge), MHS-3 MH69-306 (MHS-3 Southridge) reconditioning oil on transformer MH69-T32 at MHS-3S Southridge substation 4.31 Days
Continuous		  
19-May-26 08:00 21-May-26 16:00 ALTALINK Outage 37s T3 (37s North Calder) P&C upgrades (37s14) 2.33 Days
Continuous		  
19-May-26 08:00 21-May-26 17:00 Lethbridge TE 181s Protection & Control (181s Chinook) transfer TPR (teleprotection) circuits from existing JMUX to new SEL ICON 2.38 Days
Continuous		  
19-May-26 08:00 21-May-26 17:00 Lethbridge TE 146s Protection & Control (146s Macdonald), 241s Protection & Control (241s Uplands) protection outages on 241s and 146s 813L 'B' protection to transfer TPR (teleprotection) circuit from existing JMUX to new SEL ICON
 2.38 Days
Continuous		  
19-May-26 08:00 21-May-26 16:00 ALTALINK TE 207s RTU/SCADA (207s Pinedale), AltaLink Telecom Equipment firewall replacement , MPLS 7705A upgrade 2.33 Days
Continuous		  
19-May-26 08:00 22-May-26 18:00 ALTALINK RB 601L (230s Wardlow - 275s Jenner) O/H reties and insulator replacements 3.42 Days
Daily		  
19-May-26 08:00 21-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment firewall upgrade , MPLS 7705A and 7705B node upgrade 2.33 Days
Continuous		  
19-May-26 08:00 21-May-26 16:00 ATCO RB 7L34 (815s Goodfare - 886s Updike) walk up and climbing inspection 2.33 Days
Continuous		  
19-May-26 08:00 21-May-26 16:00 ALTALINK TE 267s RTU/SCADA (267s Killarney Lake) RTU database update 2.33 Days
Continuous		  
19-May-26 08:00 21-May-26 16:00 ALTALINK TE AltaLink RTU/SCADA (AltaLink) de-energize 9485R associate with the full building power outage 2.33 Days
Continuous		  
19-May-26 08:00 22-May-26 16:00 ENMAX Outage 3.3TR (SS-3) transformer power factor test, secondary cable test, maintenance, relay fault pressure test. oil sampling MT, TC 3.33 Days
Continuous		  
19-May-26 08:00 22-May-26 16:00 ALTALINK TE 370s Protection & Control (370s North Lethbridge) move 2411 in south building to new city of Lethbridge comm system 3.33 Days
Continuous		  
19-May-26 08:00 21-May-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) protection alarm cutovers 2.33 Days
Continuous		  
19-May-26 08:10 22-May-26 18:30 ALTALINK, ACCIONA Outage 172EL (139s Hillridge - 172L tap) perform minor preventative maintenance. 3.43 Days
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) disconnect 9L16 from existing A-frame deadend and 9L16D2 (to be renamed 9L86D1)
restore bus leave renamed 9L86D1 open for future line connection
 10.33 Days
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 10.33 Days
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 10.33 Days
Continuous		  
19-May-26 09:00 23-May-26 17:00 BCH, BPA Outage 5L52 (BPA Custer - BCH Ingledow) doble and inspection 5CB5 4.33 Days
Continuous		 AB-BC
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 10.33 Days
Continuous		  
19-May-26 12:00 21-May-26 17:00 ALTALINK TE 103s Protection & Control (103s Goose Lake) PRC005 maintenance - upgrade DSP cards and firmware updates to relays 2.21 Days
Daily		  
19-May-26 12:00 21-May-26 17:00 ALTALINK TE 396s Protection & Control (396s Pincher Creek) PRC005 maintenance - upgrade DSP cards and firmware updates to relays 2.21 Days
Daily		  
19-May-26 13:30 21-May-26 17:00 ALTALINK Outage 17s T1 (17s Benalto) install bird cover on 25 kV bus, regulator, breakers and switches, replace switch signs in 25 kV bus. 17s55 and 80 fused disconnects to be replaced, no change to fuse sizes or SLD 2.15 Days
Continuous		  
19-May-26 15:00 21-May-26 16:30 ALTALINK Outage 71s 552 (71s Lamoureux) 138 kV breaker maintenance 2.06 Days
Continuous		  
19-May-26 23:00 21-May-26 07:00 ALTALINK, TRANSALTA Outage 250p T1 (250p Bighorn Plant) maintenance 1.33 Days
Continuous		  
20-May-26 07:00 21-May-26 17:00 ALTALINK Outage 216s T3 (216s Knightsbridge), 216s 552 (216s Knightsbridge) T3 metering module replacement 1.42 Days
Continuous		  
20-May-26 07:00 21-May-26 07:00 ALTALINK, TRANSALTA Outage 250p T2 (250p Bighorn Plant) maintenance 24 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 8.42 Days
Daily		  
20-May-26 08:00 21-May-26 17:00 ATCO RB 9L84 (934s Blackfly - 977s Salt Creek) replace 3 damaged insulator strings on 9L84 structure 47 -
live line techniques		 1.38 Days
Continuous		  
20-May-26 08:00 22-May-26 17:00 ATCO TE 957s Protection & Control (957s McClelland) relay work - isolate 21A & B/ L9900 relays 2.38 Days
Continuous		  
20-May-26 08:00 23-May-26 16:00 ATCO, Syncrude Outage RL1 (848s Ruth Lake - D05), T2 (D05 Syncrude), D05 516 (D05), D05 78 (D05), D05 513 (D05), D05 517 (D05), D05 518 (D05), D05 516B (D05), D05 516A (D05), D05 513B (D05), D05 513A (D05), D05 509 (D05), D05 78A (D05), 848s RL-1D1 (848s Ruth Lake) urgent - repair work 3.33 Days
Continuous		  
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 8.33 Days
Continuous		  
20-May-26 09:00 21-May-26 17:00 BCH Outage T3 (BCH Natal) inspection/doble 1.33 Days
Continuous		 AB-BC
20-May-26 09:00 26-May-26 16:00 ATCO TE ATCO Telecom Equipment, 865s RTU/SCADA (865s Saddlehills) SaddleHills_S-Telecom- telecom work in coordination with P&C upgrade 6.29 Days
Continuous		  
20-May-26 10:00 22-May-26 17:00 ATCO TE ATCO Telecom Equipment, 755s Protection & Control (755s Cordel), 972s Protection & Control (972s Tinchebray) tower reinforcement project
 2.29 Days
Continuous		  
20-May-26 10:00 21-May-26 15:00 ATCO TE 741s Protection & Control (741s Fox Creek), 741s RTU/SCADA (741s Fox Creek) 741S Fox Creek 21B/7L90 deficiency - fixing relay mis-coordination, BMS DNP3 index mismatch - station controller update 29 Hours
Continuous		  
21-May-26 07:15 30-May-26 17:45 ALTALINK Outage 1202L (89s Ellerslie - 320p Keephills) urgent repair, transmission line maintenance 9.44 Days
Continuous		  
21-May-26 07:30 26-May-26 12:30 ALTALINK Outage 728L (157s Lac La Biche - 353s Plamondon), 788L (157s Lac La Biche - 788AL tap), 157s 138kV Bus 1 (157s Lac La Biche), 157s T1 (157s Lac La Biche), 157s 788N (157s Lac La Biche), 157s C1 (157s Lac La Biche), 157s 728W (157s Lac La Biche), 157s 652 (157s Lac La Biche), 157s 3 (157s Lac La Biche) install new switch/breaker and close 157s open point 'A' 5.21 Days
Continuous		  
21-May-26 07:30 30-May-26 17:30 ALTALINK, EPCOR RB 909L (310p Sundance - 665s Dome) safety requirement for 1202L GOI 9.42 Days
Continuous		  
21-May-26 08:00 21-May-26 16:00 ALTALINK TE 428s RTU/SCADA (428s Namaka) add and test T2 tap changer controls with ACC 8 Hours
Continuous		  
21-May-26 08:00 21-May-26 16:30 ALTALINK Outage 77s 752 (77s Sagitawah) breaker maintenance 8.5 Hours
Continuous		  
21-May-26 08:00 21-May-26 16:00 ALTALINK TE 212s RTU/SCADA (212s Lacombe) split the existing SCADA VLAN from 1 to 1 and 2

8 Hours
Continuous		  
21-May-26 08:00 21-May-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D93 protection outage - relays, lockout testing 8 Hours
Continuous		  
21-May-26 08:00 22-May-26 16:00 ENMAX Outage 6.1TR (SS-6) tap changer inspection - 6.1-TC, reversing switch check, oil sampling MT, TC, bushing 1.33 Days
Continuous		  
21-May-26 08:00 21-May-26 18:00 ENMAX Outage 16.63L (SS-16 - SS-36), 16.60L (SS-16 - SS-34), 16.2TR (SS-16), 16B69-16.63 (SS-16), 16B69-16.60 (SS-16), 16MD69-16.2TR (SS-16) 16 sub SW65 Switch maintenance 10 Hours
Continuous		  
21-May-26 08:00 21-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment test the radio paths 8 Hours
Continuous		  
21-May-26 08:00 26-May-26 12:00 ATCO, ALTALINK RB 788L (898s Heart Lake - 788AL tap) Altalink request 5.17 Days
Continuous		  
21-May-26 08:00 21-May-26 16:00 ENMAX Outage 162B138-RB94 (SS-162) breaker maintenance and breaker SF6 gas sample 8 Hours
Continuous		  
21-May-26 08:00 21-May-26 18:00 ENMAX Outage 38.3TR (SS-38) 38.3TR secondary cable replacement - punchlist item 10 Hours
Continuous		  
21-May-26 08:00 21-May-26 11:00 Lethbridge TE 181s Protection & Control (181s Chinook) 181s 138KV bus protection (GE B90) outage to add logic for DDR initiate and test output circuit.
 3 Hours
Continuous		  
21-May-26 08:30 21-May-26 17:00 ALTALINK TE 405s RTU/SCADA (405s Waupisoo) RTU database update 8.5 Hours
Continuous		  
21-May-26 11:00 21-May-26 14:00 Lethbridge TE 674s Protection & Control (674s Bowron) 674s 725LW A protection (SEL 411L) outage
to enable fault locator and test SCADA points		 3 Hours
Continuous		  
21-May-26 12:00 21-May-26 16:00 ALTALINK Outage 428s T2 (428s Namaka), 428s 652 (428s Namaka) add and test tap changer controls from ACC 4 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 6.44 Days
Continuous		  
22-May-26 08:00 22-May-26 17:00 ALTALINK TE 44s RTU/SCADA (44s Bearspaw Plant) firewall upgrade and SCADA SUB LAN work 9 Hours
Continuous		  
22-May-26 08:00 22-May-26 16:00 ALTALINK TE AltaLink RTU/SCADA (AltaLink) wiring 2 intrusion alarms from the door contact device to the SCADA D25 in the AECC data room 8 Hours
Continuous		  
22-May-26 08:00 22-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment test the radio paths 8 Hours
Continuous		  
22-May-26 08:00 22-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment add intrusion alarms to the SCADA RTU D25 8 Hours
Continuous		  
22-May-26 08:00 22-May-26 18:00 ALTALINK Outage 254s T1 (254s Coaldale) urgent maintenance 10 Hours
Continuous		  
22-May-26 08:30 22-May-26 11:30 ALTALINK RB 760L (163s Amoco Empress - 760AL tap) reclosing disabled for telecom permit 1-00518079 3 Hours
Daily		  
22-May-26 09:00 22-May-26 11:00 ATCO TE ATCO Telecom Equipment, 959s RTU/SCADA (959s Lanfine), 910s RTU/SCADA (910s Excel) Lanfine_S-Telecom- upgrade NET 11 AND NET 2 SAR TO V21, then V22
2		 2 Hours
Continuous		  
22-May-26 09:00 22-May-26 11:00 ATCO RB 7L760 (767s Oyen - 7LC760 tap), 7L760 (7LA760 tap - 7LC760 tap) reclosing disabled for telecom permit 1-00518079 2 Hours
Continuous		  
22-May-26 09:00 22-May-26 16:00 ALTALINK TE 254s RTU/SCADA (254s Coaldale) urgent supervisory outage required for 254sT1 LTC controller replacement 7 Hours
Continuous		  
22-May-26 13:00 22-May-26 15:00 ATCO TE ATCO Telecom Equipment Ksituan_S-Telecom outage to upgrade KSITUAN SUB A and B SAR OS to V21, THEN V22
2		 2 Hours
Continuous		  
22-May-26 16:05 22-May-26 17:35 ALTALINK, ACCIONA Outage 254s 172E (254s Coaldale), 83s 172W (83s Taber), 172EL (139s Hillridge - 172L tap), 172L (254s Coaldale - 172EL tap), 172L (83s Taber - 172EL tap) 172L out of service to close 172EL1 90 Mins
Continuous		  
22-May-26 23:00 23-May-26 07:00 ALTALINK Outage 964s T3 (964s Pigeon Lake) urgent - replace failed PT on 25 kV bus 8 Hours
Continuous		  
23-May-26 07:00 23-May-26 16:00 ENMAX Outage 6.80L (SS-6 - SS-35), 6B138-6.80 (SS-6) distribution crew working under line 9 Hours
Continuous		  
23-May-26 07:30 24-May-26 18:00 ALTALINK, Lethbridge Outage 207L (111s Coalbanks - 370s North Lethbridge), 370s 207X (370s North Lethbridge), 111s 207L (111s Coalbanks) 207L hardware tightening on structure 8 and 11 1.44 Days
Continuous		  
23-May-26 07:30 27-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 4.31 Days
Continuous		  
23-May-26 08:00 23-May-26 11:00 ENMAX, ALTALINK Outage 5s T1 (5s East Calgary), 138kV Bus Z31 (SS-2), MD112 (SS-2), MD104 (SS-2), MD96 (SS-2), MD88 (SS-2), MD80 (SS-2) summer substation washing 3 Hours
Continuous		  
23-May-26 08:00 25-May-26 15:00 ATCO Outage 6L02 (757s Battle River - 765s Mannix Mine), 757s 604 (757s Battle River) climbing inspection on 6L02 2.29 Days
Continuous		  
23-May-26 08:00 23-May-26 12:00 ENMAX, ALTALINK IO 5s T1 (5s East Calgary) summer substation washing 4 Hours
Continuous		  
23-May-26 08:00 23-May-26 18:00 ENMAX Outage 9.80L (SS-9 - SS-31), 31.1C (SS-31), 31.1TR (SS-31), 9B138-9.80 (SS-9), 31B138-9.80 (SS-31) substation structure painting 10 Hours
Continuous		  
23-May-26 08:00 23-May-26 18:00 ENMAX Outage 14.1TR (SS-14) 14.1TR - leaking - cooling fin dripping oil 10 Hours
Continuous		  
23-May-26 08:00 23-May-26 18:00 ENMAX Outage 14.1C (SS-14), 14.2C (SS-14) leaking - cooling fin dripping oil (bus in proximity to crane) 10 Hours
Continuous		  
23-May-26 11:00 23-May-26 13:00 ENMAX, ALTALINK Outage 5s T2 (5s East Calgary), 138kV Bus Z32 (SS-2), MD113 (SS-2), MD87 (SS-2), MD95 (SS-2), MD103 (SS-2), MD111 (SS-2) summer substation washing 2 Hours
Continuous		  
23-May-26 11:00 23-May-26 14:00 ENMAX, ALTALINK IO 5s T2 (5s East Calgary) summer substation washing 3 Hours
Continuous		  
23-May-26 13:00 23-May-26 15:00 ENMAX Outage 2MD138-2.1CAP (SS-2), MD110 (SS-2), MD109 (SS-2) summer substation washing 2 Hours
Continuous		  
23-May-26 13:00 23-May-26 15:00 ENMAX, ALTALINK Outage 5s C3 (5s East Calgary), 5s C4 (5s East Calgary) summer substation washing 2 Hours
Continuous		  
23-May-26 13:00 24-May-26 17:00 ATCO RB 9L43 (874s McKay River - 888s Dover) climbing inspection on 9L43 28 Hours
Continuous		  
23-May-26 15:00 23-May-26 17:00 ENMAX Outage 2.1TR (SS-2) summer substation washing 2 Hours
Continuous		  
24-May-26 08:00 24-May-26 12:00 ENMAX Outage 16.61L (SS-16 - SS-27), 15.62L (SS-15 - SS-16), 16.1TR (SS-16), SW71 (SS-16), 16B69-15.62 (SS-16), 16B69-16.61 (SS-16) summer substation washing, reversing switch check 4 Hours
Continuous		  
24-May-26 08:00 25-May-26 13:00 ATCO RB 9L32 (849s Joslyn Creek - 941s Bitumount), 9L32 (941s Bitumount - 2005s Secord) climbing inspection Athabasca River crossing 9L32/9L66 structures 176 and 177
 29 Hours
Continuous		  
24-May-26 08:00 25-May-26 13:00 ATCO, CNRL RB 9L66 (838s Horizon Mining - 847s Muskeg River) climbing Inspection 9L32/9L66 structures 176/177 29 Hours
Continuous		  
24-May-26 08:00 24-May-26 18:00 ENMAX Outage 24.81L (SS-24 - SS-31), 31.84L (SS-31 - SS-32), 31.3TR (SS-31), 31.2TR (SS-31), 32B138-31.84 (SS-32), SW83 (SS-31) substation structure painting 10 Hours
Continuous		  
24-May-26 08:00 27-May-26 16:00 Syncrude Outage D05 80 (D05), D05 80B (D05), ML4 (D05) SCL - this planned outage of ML-4 is in preparation of the 72kV "A" Bus outage 3.33 Days
Continuous		  
24-May-26 12:01 24-May-26 18:00 ENMAX Outage 16.63L (SS-16 - SS-36), 16.60L (SS-16 - SS-34), 16.2TR (SS-16), SW64 (SS-16), 16B69-16.63 (SS-16), 16B69-16.60 (SS-16) summer substation washing 5.98 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 11.42 Days
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 3.42 Days
Continuous		  
25-May-26 07:00 27-May-26 17:00 EPCOR Outage 816s P2401 (816s Petrolia) Petrolia: P2401 CT doble 2.42 Days
Continuous		  
25-May-26 07:00 25-May-26 17:00 EPCOR RB 987s Protection & Control (987s Clover Bar) 72/240 kV tie-line - no close command, aerial washing program 10 Hours
Continuous		  
25-May-26 07:00 26-May-26 17:00 ALTALINK, EPCOR TE 1209L (89s Ellerslie - 330p Genesee) protection blocking, firmware updates 1.42 Days
Continuous		  
25-May-26 07:00 28-May-26 17:00 EPCOR TE 72MG16 (Garneau - Meadowlark) channel 2 outage - FO-03 fiber repair 3.42 Days
Continuous		  
25-May-26 08:00 27-May-26 16:00 ALTALINK Outage 37s T5 (37s North Calder) P&C upgrades (37s49) 2.33 Days
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 3.33 Days
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 3.33 Days
Continuous		  
25-May-26 08:00 29-May-26 18:00 ALTALINK RB 601L (230s Wardlow - 275s Jenner) overhead reties and insulator replacements 4.42 Days
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 11.27 Days
Continuous		  
25-May-26 08:00 25-May-26 12:00 ENMAX Outage 2.81L (SS-2 - SS-9), 9B138-2.81 (SS-9), 2MD138-2.81 (SS-2) HV breaker SF6 gas sample 4 Hours
Continuous		  
25-May-26 08:00 27-May-26 16:00 ENMAX TE 5.8TR (SS-5) 5 Sub 5.8TR 50/51TS transformer protection outage - 1 sub transmission line cut over, protection settings changes 2.33 Days
Daily		  
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 3.33 Days
Continuous		  
25-May-26 08:00 28-May-26 16:00 ALTALINK TE 356s Protection & Control (356s Milo) 927L settings changes for metering updates 3.33 Days
Continuous		  
25-May-26 08:00 28-May-26 16:00 ALTALINK TE 356s RTU/SCADA (356s Milo) configuration updates for L4 protection metering updates 3.33 Days
Continuous		  
25-May-26 08:00 26-May-26 16:00 ALTALINK TE 89s Protection & Control (89s Ellerslie) Epcor request - firmware upgrades 1.33 Days
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 17.33 Days
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 17.33 Days
Daily		  
25-May-26 08:00 26-May-26 16:00 ENMAX Outage 11.3TR (SS-11) tap changer inspection - 11.3-TC, reversing switch check 1.33 Days
Continuous		  
25-May-26 08:00 27-May-26 16:00 Syncrude Outage UE-1 (D05 - UE-1 Syncrude Plant 30-2), D05 73B (D05), D05 73 (D05), UE-1 7206 (UE-1 Syncrude Plant 30-2) SCL - this planned outage of the UE-1 72kV transmission line is in preparation of the 72kV "A" bus outage 2.33 Days
Continuous		  
25-May-26 08:00 27-May-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) Protection alarm cutovers 2.33 Days
Continuous		  
25-May-26 08:00 25-May-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D91 protection outage - relays, lockout testing 8 Hours
Continuous		  
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 3.33 Days
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 3.33 Days
Continuous		  
25-May-26 08:00 26-May-26 16:00 ENMAX Outage 16.1TR (SS-16) 16PT69-Z21 PT outage - 16.1TR CT terminal block replacement 1.33 Days
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 Block Replacement. Back-up clearing time 27.4 cycles. 3.33 Days
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 4.33 Days
Continuous		  
25-May-26 08:00 27-May-26 17:30 ENMAX TE 5.1TR (SS-5) 5.1TR A and B protection outage - 1 sub transmission line cut over, protection settings changes 2.4 Days
Daily		  
25-May-26 08:00 27-May-26 17:30 ENMAX TE 5.5TR (SS-5) 5.5TR A and B protection outage - 1 sub transmission line cut over, protection settings changes 2.4 Days
Daily		  
25-May-26 08:00 28-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment firewall replacement, MPLS 7705A and 7705B upgrade 3.33 Days
Continuous		  
25-May-26 09:00 27-May-26 17:30 ATCO Outage 2075s 911 (2075s Newell) BREAKER SF6 3AP4FI MAINTENANCE 2.35 Days
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 4.29 Days
Continuous		  
25-May-26 09:00 25-May-26 16:00 ATCO TE ATCO Telecom Equipment replace faulty DS1 card at Anderson 7 Hours
Continuous		  
25-May-26 10:00 26-May-26 16:00 ATCO Outage 715s 701 (715s Leming Lake), 7L583 (715s Leming Lake - 970s Bourque), 970s 7L583D2 (970s Bourque) PRC-005 trip coil testing, 701CT inspection/ testing 30 Hours
Continuous		  
25-May-26 10:00 25-May-26 16:00 ATCO Outage 898s 904 (898s Heart Lake) PRC-005 trip coil testing, b phase motor cct dc fail troubleshooting/repair 6 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 11.31 Days
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 3.33 Days
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 3.29 Days
Continuous		  
25-May-26 10:00 25-May-26 14:00 Lethbridge Outage 181s 172L (181s Chinook) 181s 172L open end outage to cutover ct circuits for new ddr installation & test "initiate" output circuit 4 Hours
Continuous		  
25-May-26 10:00 25-May-26 14:00 ALTALINK, Lethbridge IO 172L (181s Chinook - 370s North Lethbridge) 181s 172L open end outage to cutover ct circuits for new ddr installation & test "Initiate" output circuit. 4 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 3.19 Days
Daily		  
25-May-26 12:00 25-May-26 16:00 ENMAX Outage 9.80L (SS-9 - SS-31), 9B138-9.80 (SS-9) hv breaker SF6 Gas Sample - 9B138-9.80 4 Hours
Continuous		  
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 3.21 Days
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 3.15 Days
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 12.13 Days
Continuous		  
25-May-26 14:30 28-May-26 16:30 ALTALINK Outage 14s T3 (14s Devon) replace 14s27 fused cutout 3.08 Days
Continuous		  
26-May-26 07:00 26-May-26 17:00 ALTALINK, EPCOR RB 746AL (524s Owens Corning - 746L tap) aerial washing program 10 Hours
Continuous		  
26-May-26 07:00 26-May-26 17:30 ALTALINK, EPCOR RB 731L (38s East Edmonton - 746L tap), 746BL (337s Canadian Liquid Air - 746L tap), 746L (731L tap - 746BL tap), 746L (746AL tap - 746BL tap), 746AL tap aerial washing program 10.5 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 2.46 Days
Continuous		  
26-May-26 08:00 26-May-26 09:59 ATCO Outage 898s 901 (898s Heart Lake) PRC-005 TRIP COIL TESTING

 119 Mins
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 2.42 Days
Continuous		  
26-May-26 08:00 27-May-26 17:00 ALTALINK TE AltaLink Telecom Equipment microwave upgrade hop between 67s Stirling and 9261R Chin Coulee 1.38 Days
Continuous		  
26-May-26 08:00 26-May-26 17:00 ALTALINK Outage 67s 2 (67s Stirling), 67s T2 (67s Stirling), 67s 820 (67s Stirling) 67sT2 Trench bushing High oil level. Tx testing. 9 Hours
Daily		  
26-May-26 08:00 26-May-26 12:00 ENMAX Outage 26.83L (SS-26 - SS-65), 26B138-26.83 (SS-26) HV Breaker SF6 Gas Sample - 26B138-26.83. Broken Counter - Repair/Replace 4 Hours
Continuous		  
26-May-26 08:00 27-May-26 17:00 ATCO TE 2005s Protection & Control (2005s Secord) protection settings changes 1.38 Days
Continuous		  
26-May-26 08:00 27-May-26 16:00 Syncrude Outage 72kV A Bus (D05), D05 71 (D05), D05 71B (D05), D05 79 (D05), D05 79A (D05), D05 79B (D05), D05 75 (D05), D05 75A (D05), D05 75B (D05) SCL - Outage required to perform maintenance on 75A switch. 1.33 Days
Continuous		  
26-May-26 08:00 26-May-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D90 protection outage - relays, lockout testing 8 Hours
Continuous		  
26-May-26 09:00 26-May-26 16:00 ALTALINK Outage 121s 1052 (121s Brooks) 121s1052 breaker CT testing 7 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 2.13 Days
Continuous		  
26-May-26 09:00 26-May-26 13:00 ALTALINK, Lethbridge Outage 463L (181s Chinook - 463AL tap), 181s 463L (181s Chinook) 181s 463L open end outage to cutover CT circuits for new DDR installation, test initiate output circuits from required relays to DDR 4 Hours
Continuous		  
26-May-26 09:00 26-May-26 13:00 ALTALINK, Lethbridge IO 463L (181s Chinook - 463AL tap) 181s 463L open end outage to cutover CT circuits for new DDR installation, test initiate output circuits from required relays to DDR 4 Hours
Continuous		  
26-May-26 09:30 15-Jul-26 16:30 ALTALINK Outage 157s C1 (157s Lac La Biche) trip test (157s852) 50.29 Days
Continuous		  
26-May-26 10:00 26-May-26 11:59 ATCO Outage 898s 902 (898s Heart Lake) PRC-005 TRIP COIL TESTING

 119 Mins
Continuous		  
26-May-26 10:00 26-May-26 16:00 ATCO TE ATCO Telecom Equipment Bitumont Telecom
Fujitsu FW4100 shelf at Bitumont has lost its LAN connection to the switch. Need to Reboot.
Traffic impacted:
#155 RAS A&B - MCCLLELAND / HORIZON
9L32 A&B - SECORD / HORIZON
9L32 / 9L101 RAS A - JOSLYN / MCCLELLAND
 6 Hours
Continuous		  
26-May-26 10:01 26-May-26 11:00 ATCO TE ATCO RTU/SCADA, ATCO Telecom Equipment, 2005s RTU/SCADA (2005s Secord), 941s RTU/SCADA (941s Bitumount) SECORD 'A' SAR AND NET 11 SAR OS UPGRADES
2 SEPARATE OUTAGES APPROX 30 MINS EACH:

OUTAGE 1 (A SAR):
SECORD SUB SCADA
9L32 / 9L101 A&B
9L32 A
)
#155 RAS A

OUTAGE 2 (NET11):
9L32 / 9L101 RAS A
9L32 B
#155 KEARL RAS B
 59 Mins
Continuous		  
26-May-26 11:01 26-May-26 12:00 ATCO TE ATCO Telecom Equipment McClelland_S-Telecom- Upgrading the A SARS AND NET 11 SARS at MCCLELLAND, to V21, then V22. 2 SEPARATE OUTAGE IMPACTING THE FOLLOWING TRAFFIC:
OUTAGE 1 APPROX 1 HOUR:#155 RAS A, 9L101 A&B, 9L32 A&B
OUTAGE 2 APPROX 1 HOUR:#155 RAS B, 9L101 A, 9L32 A		 59 Mins
Continuous		  
26-May-26 12:00 26-May-26 13:59 ATCO Outage 898s 903 (898s Heart Lake) PRC-005 TRIP COIL TESTING

 119 Mins
Continuous		  
26-May-26 12:00 26-May-26 16:00 ENMAX Outage 26B138-26BT3 (SS-26) HV Breaker SF6 Gas Sample - 26B138-26BT3 4 Hours
Continuous		  
26-May-26 14:00 26-May-26 15:59 ATCO Outage 898s 905 (898s Heart Lake) PRC-005 TRIP COIL TESTING

 119 Mins
Continuous		  
27-May-26 07:00 29-May-26 17:00 ALTALINK, EPCOR RB 430L (330P Genesee - 510S Sunnybrook) aerial washing program 2.42 Days
Continuous		  
27-May-26 07:00 29-May-26 17:30 ALTALINK, EPCOR RB 430L (330P Genesee - 510S Sunnybrook) aerial washing program 2.44 Days
Continuous		  
27-May-26 07:30 31-May-26 15:00 CMH Outage MHS-5 MH69-T51 (MH69s5 NE Crescent Height) Outage to facilitate reconditioning oil for transformer MH69-T51 at MHS-5S Northeast Crescent Heights Substation. 4.31 Days
Continuous		  
27-May-26 08:00 27-May-26 09:59 ATCO Outage 898s 906 (898s Heart Lake) PRC-005 trip coil testing
 119 Mins
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 1.38 Days
Continuous		  
27-May-26 08:00 28-May-26 16:00 ENMAX, ALTALINK Outage 24.83L (74s Janet - SS-24) HV Breaker Maintenance. 24B138-24.83 Breaker Racking Support Install 1.33 Days
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 1.33 Days
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 1.33 Days
Continuous		  
27-May-26 08:00 27-May-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D89 protection outage - relays, lockout testing 8 Hours
Continuous		  
27-May-26 08:00 28-May-26 16:00 ENMAX Outage 16.2TR (SS-16) 16.2TR CT terminal block replacement 1.33 Days
Continuous		  
27-May-26 08:00 27-May-26 16:00 ALTALINK TE 523s Protection & Control (523s Bullshead) protection outage to B138B1 A87/138B1 URB30 - replace DSP modules, complete a minor firmware upgrade 8 Hours
Continuous		  
27-May-26 09:00 27-May-26 17:00 ATCO TE ATCO Telecom Equipment Moose Hill_T-Telecom - major IRU maintenance 8 Hours
Continuous		  
27-May-26 09:00 27-May-26 16:00 ALTALINK Outage 121s 795X (121s Brooks) 121s795X Breaker CT Testing. 7 Hours
Continuous		  
27-May-26 09:00 27-May-26 16:00 ATCO TE ATCO Telecom Equipment, ATC 803s RTU/SCADA (ATC 803s Bullpound) IRU radio major maintenance - Bullpound S to Wintering hills Twr
NOC - firmware upgrade
 7 Hours
Continuous		  
27-May-26 09:00 01-Jun-26 20:00 SUNCOR Outage 29EDD-1 29EDD1S11 (29EDD-1 Millennium), 29EDD-1 29EDD1s552 (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 5.46 Days
Continuous		  
27-May-26 09:00 29-May-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) updating 9L59, 9L93 and 9L16 relays 2.33 Days
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, 702CT Inspection/ Testing 30 Hours
Continuous		  
27-May-26 10:00 27-May-26 11:59 ATCO Outage 898s 908 (898s Heart Lake) PRC-005 trip coil testing
 119 Mins
Continuous		  
27-May-26 12:00 27-May-26 13:59 ATCO Outage 898s 909 (898s Heart Lake) PRC-005 trip coil testing
 119 Mins
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) Petrolia: P2405 CT Doble 2.42 Days
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 08:00 28-May-26 16:00 ALTALINK TE 396s RTU/SCADA (396s Pincher Creek), AltaLink Telecom Equipment urgent repair - 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 898s 708 (898s Heart Lake), 788L (898s Heart Lake - 788AL tap) PRC-005 TRIP COIL TESTING 119 Mins
Continuous		  
29-May-26 08:00 29-May-26 16:00 ENMAX Outage 37.81L (SS-37 - SS-38), 37B138-37.81 (SS-37) HV Breaker Maintenance 8 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) Urgent, 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		  

Prepared On:   2026-05-20   12:29:32

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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