Alberta Electric System Operator
System Co-ordination Plan
2026-05-07 to 2026-05-15
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		  
12-Sep-25 08:00 19-Jun-26 16:00 ENMAX Outage 33.1TR (SS-33) tap changer refurbishments. soak test required 280.33 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 30-Jun-26 17:00 ATCO TE 972s RTU/SCADA (972s Tinchebray) config changes needed throughout the CETO project 147.29 Days
Continuous		  
09-Feb-26 09:00 26-Jun-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) block all 50BF protection until cutovers and associated commissioning are complete 137.29 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 15-May-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 65.09 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 14-May-26 17:00 ATCO TE 833s RTU/SCADA (833s Mariana) updating RTU/station controller configuration during SCADA upgrade project 47.21 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		  
08-Apr-26 07:00 10-May-26 17:00 ALTALINK, ALPAC IO 796L (282s Grassland - 796AL tap) note for area assessments 32.42 Days
Continuous		  
09-Apr-26 17:01 15-May-26 17:00 EPCOR Outage 72RW3 (Rossdale - Woodcroft), RW727 (Rossdale) termination rebuild at the Woodcroft end 36 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		  
14-Apr-26 07:00 07-May-26 17:00 EPCOR Outage 330p 500kV Bus 2 (330p Genesee), 330p 12TC2 (330p Genesee), 330p 1209 (330p Genesee), 330p 1206 (330p Genesee), 330p 1203 (330p Genesee), 330p 1211 (330p Genesee), 330p 1215 (330p Genesee), 330p 12TC2D (330p Genesee), 330p 809 (330p Genesee) Genesee 500 kV bus 2, POW project installation 23.42 Days
Continuous		  
20-Apr-26 07:00 08-May-26 17:00 EPCOR TE Protection & Control (Kennedale) protection blocking - relay maintenance 18.42 Days
Continuous		  
20-Apr-26 07:00 08-May-26 17:00 EPCOR TE 72CN10 (987s Clover Bar - Namao) protection blocking - MPLS upgrade 18.42 Days
Continuous		  
20-Apr-26 07:00 08-May-26 17:00 EPCOR TE 72CH11 (987s Clover Bar - EP Hardisty) protection blocking - MPLS upgrade 18.42 Days
Continuous		  
20-Apr-26 07:00 08-May-26 17:00 EPCOR TE 72CH9 (987s Clover Bar - EP Hardisty) protection blocking - MPLS upgrade 18.42 Days
Continuous		  
20-Apr-26 07:00 08-May-26 17:00 EPCOR TE 72KN23 (Kennedale - Namao) protection blocking - MPLS upgrade 18.42 Days
Continuous		  
21-Apr-26 09:00 08-May-26 17:00 ALTALINK Outage 394s T3 (394s Empress), 394s 36 (394s Empress) 394sT3 CT7 replacement, cable repair 17.33 Days
Continuous		  
21-Apr-26 15:00 08-May-26 09:00 ALTALINK Outage 1182s 138kV Bus 1 (1182s Berland River), 620L (1182s Berland River - 328s Pine Creek), 1182s T1 (1182s Berland River), 1182s C1 (1182s Berland River), 1182s C2 (1182s Berland River), 328s 620 (328s Pine Creek), 1182s 152 (1182s Berland River) complete 620L and energize new 1182s, close 620L ope point 'A', 1182s cap bank testing, soak 1182s T1 for 24 hours, load pickup 16.75 Days
Continuous		  
22-Apr-26 08:00 08-May-26 16:00 ALTALINK TE 328s RTU/SCADA (328s Pine Creek) RTU updates for changes involving 620L P&C equipment 16.33 Days
Continuous		  
22-Apr-26 08:00 08-May-26 16:00 ALTALINK TE 328s Protection & Control (328s Pine Creek) circuit modification and testing involving 620L P&C equipment 16.33 Days
Continuous		  
24-Apr-26 08:00 11-May-26 16:00 Syncrude Outage C1 (Aurora), 31 (Aurora), 32 (Aurora), 33 (Aurora), 31B (Aurora), 32A (Aurora), 32B (Aurora) zone 12 6 year maintenance 17.33 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 11-May-26 18:00 ALTALINK, ATCO Outage 87s 240kV East Bus (87s Gaetz), 87s T2 (87s Gaetz), 962L (87s Gaetz - 972s Tinchebray), 986L (87s Gaetz - 972s Tinchebray), 87s 1552 (87s Gaetz), 87s 1652 (87s Gaetz), 87s 1952 (87s Gaetz), 87s 1252 (87s Gaetz) commissioning 87s962 & 87s986 MODs 14.42 Days
Continuous		  
27-Apr-26 08:00 08-May-26 16:00 CMH TE MHS-7 Protection & Control (MHS-7 Brier Park) perform preventative maintenance on BPR-138-B 11.33 Days
Continuous		  
27-Apr-26 08:00 15-May-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) P&C upgrades (37s4, 37s82, 37s88, 37s81) 18.33 Days
Continuous		  
27-Apr-26 08:00 28-May-26 08:00 Saskpower Outage Sask Power CC904T maintenance 31 Days
Continuous		 AB-SK
27-Apr-26 11:00 07-May-26 16:00 ALTALINK, EPCOR RB 930L (37s North Calder - Poundmaker) reclose block for Altalink working on 37s North Calder 10.21 Days
Continuous		  
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		  
29-Apr-26 07:00 07-May-26 17:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) 275s Jenner RTU update for switch replacement 8.42 Days
Continuous		  
29-Apr-26 08:00 07-May-26 18:00 ALTALINK Outage 275s T1 (275s Jenner), 275s 38 (275s Jenner), 275s 39 (275s Jenner), 275s 2152 (275s Jenner), 275s 81 (275s Jenner), 275s 2269 (275s Jenner), 275s 2036N (275s Jenner) 275sT1 oil reclaim, maintenance, plugged radiator, replace switch 275s37 and 275s39. replace 25kV post insulators.275s2269, 275s2036N, & 275s81 8.42 Days
Continuous		  
29-Apr-26 17:00 19-May-26 07:00 ALTALINK Outage 320p 2089 (320p Keephills) urgent customer work 19.58 Days
Continuous		  
01-May-26 14:00 07-May-26 16:00 ALTALINK, EPCOR RB 920L (37s North Calder - 557s Castle Downs) reclose block for Altalink working on 37s North Calder 6.08 Days
Continuous		  
01-May-26 14:01 07-May-26 13:29 ALTALINK Outage 37s T6 (37s North Calder), 37s 4 (37s North Calder), 37s 88 (37s North Calder), 37s 81 (37s North Calder), 37s 90 (37s North Calder) P&C upgrades (37s4, 37s88, 37s81, T6, PT20) 5.98 Days
Continuous		  
01-May-26 17:00 25-Nov-26 17:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 208.04 Days
Continuous		  
01-May-26 17:01 15-May-26 17:00 ATCO Outage 951s 920C (951s Thickwood) 920C cap at 951s Thickwood unavailable, forced outage 14 Days
Continuous		  
03-May-26 10:00 15-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
12.29 Days
Continuous		  
04-May-26 07:00 10-May-26 17:00 EPCOR Outage 814s T1 (814s Bellamy), BR721 (Rossdale), 814s B2401 (814s Bellamy), 814s B2407 (814s Bellamy), 814s BAB1 (814s Bellamy) Bellamy: TX1, breaker and disconnect switch maintenance 6.42 Days
Continuous		  
04-May-26 07:00 08-May-26 17:00 EPCOR Outage 805s T4 (805s Jasper), EP 805s J2406 (EP 805s Jasper), EP 805s J2405 (EP 805s Jasper), EP 805s JAB4 (EP 805s Jasper) Jasper: TX4 relay maintenance 4.42 Days
Continuous		  
04-May-26 07:00 08-May-26 15:00 CMH Outage MHS-5 MH69-510 (MHS-5 NE Crescent Heights) breaker maintenance and inspection 4.33 Days
Continuous		  
04-May-26 07:00 07-May-26 17:00 ALTALINK TE 256s Protection & Control (256s Harmattan) techs to isolate cap bank protection to assist with subs capacitor bank outage 3.42 Days
Continuous		  
04-May-26 08:00 15-May-26 17:00 BCH, BPA Outage 2L112 (BPA Boundary - BCH Nelway) emergency replacement of a boundary PCB, BC maintenance does not affect the Alberta ATC 11.38 Days
Continuous		 AB-BC
04-May-26 08:00 07-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 321s RTU/SCADA (321s Al Rothbauer) firewall replacement, LAN switch replacement, firmware 7705A upgrade, raw socket conversion 3.33 Days
Continuous		  
04-May-26 08:00 07-May-26 16:00 ENMAX Outage 11.1TR (SS-11) transformer power factor test, secondary cable test, transformer maintenance, relay fault pressure test, reversing switch check and oil sampling 3.33 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 09:00 18-May-26 17:30 ATCO Outage 13L50 (2029s Heathfield - 2075s Newell) annual EATL outage at 2075s and 2029s 14.35 Days
Continuous		  
04-May-26 09:00 18-May-26 17:30 ATCO Outage 2029s T11 (2029s Heathfield), 2029s 1205 (2029s Heathfield), 2029s 1206 (2029s Heathfield) annual EATL outage 14.35 Days
Continuous		  
04-May-26 09:00 18-May-26 17:30 ATCO Outage 2075s T11 (2075s Newell), 2075s 916 (2075s Newell), 2075s 917 (2075s Newell) annual EATL outage 14.35 Days
Continuous		  
04-May-26 09:00 08-May-26 17:00 BCH Outage 5L98 (BCH Nicola - BCH Vaseux Lake) replace spacer damper and insulator, BC maintenance does not affect the Alberta ATC 4.33 Days
Continuous		 AB-BC
04-May-26 09:30 07-May-26 17:30 ATCO Outage 722s 702T (722s Crystal Lake) repair damaged secondary cables on 702T
 3.33 Days
Continuous		  
04-May-26 09:30 07-May-26 17:30 ATCO TE 722s RTU/SCADA (722s Crystal Lake) rewire breaker 510 status, RTXP test switch mitigation and replacement 3.33 Days
Continuous		  
04-May-26 10:00 08-May-26 16:00 ATCO, CNRL TE 838s RTU/SCADA (838s Horizon Mining), 842s RTU/SCADA (842s Horizon Upgrading) SCADA Outages while RTU updates are completed 4.25 Days
Continuous		  
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		  
04-May-26 12:00 07-May-26 18:00 ALTALINK Outage 256s C1 (256s Harmattan) 256sC1 replace capacitors, testing and trouble shooting 3.25 Days
Continuous		  
05-May-26 08:00 07-May-26 16:00 ALTALINK TE 370s Protection & Control (370s North Lethbridge) move relay to new City of Lethbridge communication system 2.33 Days
Continuous		  
05-May-26 08:00 07-May-26 17:00 Lethbridge TE 241s Protection & Control (241s Uplands) transfer TPR (Teleprotection) circuit from existing JMUX to new SEL ICON 2.38 Days
Continuous		  
05-May-26 08:00 07-May-26 16:00 ALTALINK TE 177s RTU/SCADA (177s West Cascade) testing analogs on 105L to clean up SCADA deficiencies, 177s 15min loss of visibility while RTU is updated 2.33 Days
Continuous		  
05-May-26 08:00 18-May-26 17:30 ATCO TE 2029s Protection & Control (2029s Heathfield) fire suppression inspection and recertification, install blocking switches, requires protection to be blocked, could case alarms to AML, valve cooling system maintenance and repairs. 13.4 Days
Continuous		  
05-May-26 08:00 18-May-26 17:30 ATCO TE 2075s Protection & Control (2075s Newell) fire suppression inspection and recertification, install blocking switches, requires protection to be blocked, could case alarms to AML, valve cooling system maintenance and repairs. 13.4 Days
Continuous		  
05-May-26 08:00 07-May-26 17:00 ALTALINK Outage 33s 2 (33s Spray) maintenance 2.38 Days
Continuous		  
05-May-26 08:00 08-May-26 16:00 CMH Outage MHS-5 MH69-509 (MHS-5 NE Crescent Heights) repair of damaged disconnect Switch MH69-509 that requires immediate attention 3.33 Days
Continuous		  
05-May-26 09:00 07-May-26 16:00 ALTALINK TE 29s Protection & Control (29s Cascade) cutover of 54L prot alarms 2.29 Days
Continuous		  
05-May-26 09:00 07-May-26 17:00 ATCO Outage 972s 901 (972s Tinchebray)
connect 900BS1 to new 907B
Cutover 900SST1 non elec trips to new 900BS1 protection
cutover 901CT and 901 trips to new 900BS1 protection 		2.33 Days
Continuous		  
05-May-26 09:00 07-May-26 17:00 ALTALINK Outage 33s 1 (33s Spray) maintenance 2.33 Days
Continuous		  
05-May-26 12:00 08-May-26 12:00 ATCO Outage 786s 703T (786s High Level), 786s 703 (786s High Level), 786s SVC (786s High Level) svc air cooled maintenance at 786s 3 Days
Continuous		  
06-May-26 07:00 07-May-26 18:00 ALTALINK Outage 887s 520 (887s Carson Creek), 520L (887s Carson Creek - 526L tap) component replacement on 520L (STR 5-6) 1.46 Days
Continuous		  
06-May-26 07:00 08-May-26 17:30 ALTALINK Outage 268s 797 (268s Whitecourt), 364s 797 (364s Whitecourt Industrial), 797L (268s Whitecourt - 364s Whitecourt industrial) transmission line maintenance 2.44 Days
Continuous		  
06-May-26 07:15 07-May-26 17:45 ATCO RB 9L27 (755s Cordel - 863s Paintearth) work on 9L948 1.44 Days
Continuous		  
06-May-26 08:00 07-May-26 16:00 ENMAX Outage 12B138-832L (SS-12), 832L (SS-10 - SS-12), 10B138-832 (SS-10) breaker maintenance 1.33 Days
Continuous		  
06-May-26 08:00 07-May-26 17:00 ATCO, ALTALINK Outage 948L (650s Hansman Lake - 863s Paintearth), 863s 902 (863s Paintearth), 863s 9L948D4 (863s Paintearth) transmission line maintenance 1.38 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		  
06-May-26 09:00 08-May-26 16:00 ATCO Outage 2032s 701T (2032s Sweetheart Lake) transformer maintenance 2.29 Days
Continuous		  
07-May-26 07:00 07-May-26 18:00 ATCO TE 970s Protection & Control (970s Bourque) change relay settings on 7L574 to alt settings at 970S 11 Hours
Continuous		  
07-May-26 07:30 08-May-26 18:00 ALTALINK Outage 262s 870W (262s Rocky Mountain House), 870L (262s Rocky Mountain House - 263s Strachan), 263s 870E (263s Strachan) test CT7 to determine if Koncar type CT needs to be scheduled for replacement 1.44 Days
Continuous		  
07-May-26 07:30 07-May-26 10:30 ALTALINK Outage 37s 747W (37s North Calder), 747L (37s North Calder - 711L tap) trip testing 3 Hours
Continuous		  
07-May-26 08:00 07-May-26 17:00 ATCO, CNRL TE ATCO Telecom Equipment, 859s RTU/SCADA (859s Primrose) Wolf Lake_S-Telecom- testing and possibly replacing the B side or the switch gear 9 Hours
Continuous		  
07-May-26 08:00 07-May-26 16:00 ALTALINK TE 698s RTU/SCADA (698s Jackfish) split the existing SCADA VLAN from 1 to 1 and 2
8 Hours
Continuous		  
07-May-26 08:00 07-May-26 16:00 ENMAX RB 31.84L (SS-31 - SS-32) tree trimming 8 Hours
Continuous		  
07-May-26 08:00 07-May-26 16:00 ENMAX RB 16.63L (SS-16 - SS-36) tree trimming 8 Hours
Continuous		  
07-May-26 08:00 07-May-26 17:00 ATCO RB 7L574 (822s Wolf Lake - 7L574 tap), 7L574 (970s Bourque - 7L574 tap), 7L35 (859s Primrose - 7L35 tap) reclosing turned off on 7L574/7L35 for the duration of this work 1-00517342 9 Hours
Continuous		  
07-May-26 08:00 07-May-26 17:00 ATCO, CNRL TE 859s RTU/SCADA (859s Primrose) ATCO scope - aprisa radio between Wolf Lake and Primrose testing
 9 Hours
Continuous		  
07-May-26 08:00 07-May-26 16:00 ENMAX TE RTU/SCADA (SS-35) SCADA RTU/Alarm test 8 Hours
Daily		  
07-May-26 08:00 07-May-26 15:00 ENMAX Outage 6.82L (SS-6 - SS-41), 6B138-6.82 (SS-6), 41B138-6.82 (SS-41) OH crew to install a pole under the line at the corner of 24 st and 162 av sw 7 Hours
Continuous		  
07-May-26 08:45 07-May-26 16:45 ALTALINK Outage 14s 739E (14s Devon), 155s 739 (155s Blackmud), 739L (14s Devon - 155s Blackmud) 138kV breaker maintenance 8 Hours
Continuous		  
07-May-26 09:00 19-May-26 17:00 ATCO Outage 972s 908 (972s Tinchebray), 972s 909 (972s Tinchebray) GOI is required on 907B to isolate 908/909 bay and new 9L16 12.33 Days
Continuous		  
07-May-26 09:00 07-May-26 09:20 CMH TE MH-15L (MHS-7 Brier Park - MHS-9 South Saskatchewan) facilitate fiber optic integrity testing on MH138-15L A line protection 20 Mins
Continuous		  
07-May-26 09:20 07-May-26 09:40 CMH TE MH-15L (MHS-7 Brier Park - MHS-9 South Saskatchewan) facilitate fiber optic integrity testing on MH138-15L B line protection 20 Mins
Continuous		  
07-May-26 09:40 07-May-26 10:00 CMH TE MH-60L (MHS-5 NE Crescent Heights - MHS-7 Brier Park) facilitate fiber optic integrity testing on MH69-60L A line protection 20 Mins
Continuous		  
07-May-26 10:00 07-May-26 10:20 CMH TE MH-60L (MHS-5 NE Crescent Heights - MHS-7 Brier Park) facilitate fiber optic integrity testing on MH69-60L B line protection 20 Mins
Continuous		  
07-May-26 10:20 07-May-26 10:40 CMH, TCPL TE MH-65L (MHS-7 Brier Park - Cancarb Energy Medicine Hat) facilitate fiber optic integrity testing on MH69-65L A line protection 20 Mins
Continuous		  
07-May-26 10:31 07-May-26 13:30 ALTALINK Outage 37s 898 (37s North Calder), 898L (37s North Calder - 92s Viscount), 92s 898 (92s Viscount) trip testing 2.98 Hours
Continuous		  
07-May-26 10:40 07-May-26 11:00 CMH, TCPL TE MH-65L (MHS-7 Brier Park - Cancarb Energy Medicine Hat) facilitate fiber optic integrity testing on MH69-65L B line protection 20 Mins
Continuous		  
07-May-26 12:00 07-May-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) RTU mitigations and reboot 5 Hours
Continuous		 AB-MATL
07-May-26 13:30 07-May-26 16:30 ALTALINK Outage 37s 726E (37s North Calder) trip testing 3 Hours
Continuous		  
07-May-26 14:00 14-May-26 17:00 ALTALINK, EPCOR Outage 37s Protection & Control (37s North Calder), 37s 88 (37s North Calder), 37s 82 (37s North Calder), 920L (37s North Calder - 557s Castle Downs), 37s 87 (37s North Calder) P&C upgrades (37s88, 37s82, PT21) 7.13 Days
Continuous		  
08-May-26 07:00 09-May-26 18:00 ALTALINK Outage 228s 744 (228s T.M.P.L. Niton), 744L (228s T.M.P.L. Niton - 744AL tap) replacing cross arms and insulators on structures 1.46 Days
Continuous		  
08-May-26 08:00 08-May-26 16:00 ENMAX Outage 3.84L (SS-3 - SS-13), 3B138-3.84 (SS-3), 13B138-3.84 (SS-13) shield wire corrosion, power factor test 8 Hours
Continuous		  
08-May-26 08:00 08-May-26 16:00 ALTALINK TE 818s Winefred RTU/SCADA split the existing SCADA VLAN
8 Hours
Continuous		  
08-May-26 08:00 08-May-26 16:00 ENMAX RB 21.61L (SS-21 - SS-34) tree trimming 8 Hours
Continuous		  
08-May-26 08:00 08-May-26 16:00 ENMAX RB 13.60L (SS-13 - SS-27) tree trimming 8 Hours
Continuous		  
08-May-26 08:00 08-May-26 16:00 ENMAX RB 16.60L (SS-16 - SS-34) tree trimming 8 Hours
Continuous		  
08-May-26 08:00 08-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment Wiring 3 intrusion alarms from the door contract device to the SCADA D25 in the ACC data room. 15min lost of visibility while updating RTU Config. 8 Hours
Continuous		  
08-May-26 09:00 09-May-26 17:00 ATCO Outage 972s 240kV Bus 900BS2 (972s Tinchebray), 972s 903 (972s Tinchebray), 972s 906 (972s Tinchebray) connect new 909A to 900BS2 1.33 Days
Continuous		  
09-May-26 07:00 09-May-26 17:00 EPCOR TE EP 803s RTU/SCADA (EP 803s Lambton) RTU outage - station firewall replacement, communications outage 10 Hours
Continuous		  
09-May-26 07:00 13-May-26 18:00 ALTALINK Outage 612L (336s Fincastle - 368s Burdett), 336s 612 (336s Fincastle), 368s 612 (368s Burdett) replacing cross arms and insulators on structures 174, 196, 197, 198, 203, 205, 206, 207, 208, 209, 210, 211 and 212 4.46 Days
Continuous		  
09-May-26 08:00 09-May-26 16:00 ALTALINK TE 71s RTU/SCADA (71s Lamoureux) split the existing SCADA VLAN 8 Hours
Continuous		  
09-May-26 09:00 10-May-26 17:00 BCH Outage 5L91 (BCH Ashton Creek - BCH Selkirk) urgent work to support a major project 1.33 Days
Continuous		 AB-BC
10-May-26 07:00 10-May-26 17:00 EPCOR TE RTU/SCADA (EPCOR Hardisty) RTU outage - substation firewall replacement, full communications outage 10 Hours
Continuous		  
10-May-26 08:00 10-May-26 17:00 ALTALINK Outage 199L (268s Whitecourt - 199AL tap), 268s 199N (268s Whitecourt) replace keeper keys at structure 375 9 Hours
Continuous		  
10-May-26 08:00 11-May-26 16:00 ENMAX, ALTALINK TE 653s RTU/SCADA (653s Summit) updating the RTU configuration 1.33 Days
Continuous		  
11-May-26 07:00 14-May-26 18:00 ATCO, ENBRIDGE, ALTALINK IO 7LA114 (658s Chard - 7L114 tap), 7L114 (72s Leismer - 7LA114 tap), 7L114 (907s Waddell - 7LA114 tap), 907s Waddell AltaLink outage on 72sT2 causing an outage to 7L114 at 907S 3.46 Days
Continuous		  
11-May-26 07:00 13-May-26 17:00 EPCOR Outage 72RW3 (Rossdale - Woodcroft), W724 (Woodcroft), W725 (Woodcroft), RW727 (Rossdale) termination rebuild (Woodcroft end), scaffold removal 2.42 Days
Continuous		  
11-May-26 07:00 17-May-26 17:00 EPCOR Outage 814s T2 (814s Bellamy), BR722 (Rossdale), 814s B2402 (814s Bellamy), 814s B2406 (814s Bellamy), 814s BAB2 (814s Bellamy) TX2 zone doble, breaker maintenance/doble, and disconnect maintenance 6.42 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 07:00 15-May-26 17:00 ALTALINK, EPCOR RB 711L (113s Inland Cement - 747L tap) 711L - aerial washing program 4.42 Days
Continuous		  
11-May-26 07:00 15-May-26 17:30 ALTALINK RB 747L (37s North Calder - 711L tap), 747L (99s North St. Albert - 711L tap), 711L tap 711L - aerial washing program 4.44 Days
Continuous		  
11-May-26 07:00 14-May-26 18:00 ALTALINK Outage 72s T2 (72s Leismer), 72s 1052 (72s Leismer) T2 - maintenance, doble testing, Coresense and Qualitrol installation
72s1052 - 1st trip and breaker maintenance		 3.46 Days
Continuous		  
11-May-26 07:00 14-May-26 17:00 ALTALINK, ATCO Outage 72s 1052 (72s Leismer), 7L114 (72s Leismer - 7LA114 tap) customer maintenance 3.42 Days
Continuous		  
11-May-26 07:00 13-May-26 18:00 ALTALINK, DOW RB 787L (166s Dow Chemical Fort Saskatchewan - 787AL tap), 787L (71s Lamoureux - 787AL tap), 787AL (906s Ross Creek - 787L tap) install a concrete foundation for future structure 31 monopole 2.46 Days
Continuous		  
11-May-26 07:00 11-May-26 13:00 EPCOR Outage 987s GT3 (987s Clover Bar), 987s CGB3 (987s Clover Bar) maintenance 6 Hours
Continuous		  
11-May-26 07:00 11-May-26 17:00 EPCOR Outage 987s C1 (987s Clover Bar), 987s C72C1 (987s Clover Bar) bus diff upgrade project 10 Hours
Continuous		  
11-May-26 07:00 11-May-26 17:00 EPCOR Outage 987s GB1B (987s Clover Bar) bus diff upgrade project 10 Hours
Continuous		  
11-May-26 08:00 14-May-26 16:00 ALTALINK TE 71s RTU/SCADA (71s Lamoureux), AltaLink Telecom Equipment upgrade firewall, MPLS nodes, MPLS raw socket 3.33 Days
Continuous		  
11-May-26 08:00 14-May-26 16:00 ATCO RB 7L75 (ATC 793s West Peace River - 800s Friedenstal) walk up and climbing inspection 3.33 Days
Continuous		  
11-May-26 08:00 12-May-26 16:00 ALTALINK TE APS# 178 172L (370S-181S) Overload Mitigation move relay to new City of Lethbridge communication system 1.33 Days
Continuous		  
11-May-26 08:00 12-May-26 17:00 Lethbridge TE 181s Protection & Control (181s Chinook) protection outages on 181s RAS 178 'A' & 'B' protections to transfer TPR (teleprotection) circuits from existing JMUX to new SEL ICON 1.38 Days
Continuous		  
11-May-26 08:00 12-May-26 16:00 ENMAX Outage 833L (SS-2 - SS-12), 12B138-833L (SS-12), 2MD138-833L (SS-2) breaker maintenance 1.33 Days
Continuous		  
11-May-26 08:00 14-May-26 16:00 ALTALINK Outage 74s 76 (74s Janet) 74s76 major maintenance 3.33 Days
Continuous		  
11-May-26 08:00 14-May-26 16:00 ALTALINK TE 127s RTU/SCADA (127s Bruderheim), AltaLink Telecom Equipment firewall upgrade, raw socket conversion, MPLS 7705A and 7705B upgrade 3.33 Days
Continuous		  
11-May-26 08:00 13-May-26 16:00 ALTALINK TE AltaLink Telecom Equipment, 275s RTU/SCADA (275s Jenner) firewall replacement, MPLS 7705 A and 7705B upgrade 2.33 Days
Continuous		  
11-May-26 08:00 24-May-26 16:00 Syncrude Outage 211 (Aurora), 213 (Aurora), 212B (Aurora), 213A (Aurora), 89-215 (Aurora), AL-1 (Aurora - D05), D05 520 (D05), D05 517 (D05), D05 519 (D05) zone 5 6yr PM 13.33 Days
Continuous		  
11-May-26 08:00 11-May-26 16:00 ENMAX RB 26.81L (SS-26 - SS-32) tree trimming 8 Hours
Continuous		  
11-May-26 08:00 11-May-26 16:00 ENMAX RB 37.81L (SS-37 - SS-38) tree trimming 8 Hours
Continuous		  
11-May-26 08:00 15-May-26 16:00 CMH TE MHS-7 Protection & Control (MHS-7 Brier Park) Perform preventative maintenance on BPR-69-A 4.33 Days
Continuous		  
11-May-26 08:00 15-May-26 15:00 CMH Outage MH-20L (MHS-3 Southridge - MHS-6 CMH Riverview), MHS-3 MH138-T34 (MHS-3 Southridge), MHS-6 MH138-T63 (MHS-6 Riverview), MHS-6 MH138-620 (MHS-6 CMH Riverview), MHS-3 MH138-317 (MHS-3 Southridge), MHS-3 MH69-302 (MHS-3 Southridge), MHS-6 MH69-611 (MHS-6 CMH Riverview) installation of lightning protection at MHS-3S south ridge substation 4.29 Days
Continuous		  
11-May-26 08:00 12-May-26 16:00 ENMAX TE RTU/SCADA (SS-43) SCADA RTU test - RTU-43, SCADA alarm test - RTU-43 ANN 1.33 Days
Daily		  
11-May-26 08:00 11-May-26 16:00 ENMAX TE Protection & Control (SS-65) 65 sub 86BF D135 lockout relay protection outage - relays, lockout testing 65RLY240-D135 8 Hours
Continuous		  
11-May-26 08:00 14-May-26 16:00 ENMAX Outage 16.1TR (SS-16) 16PT69-Z21 PT outage. Fault clearing time 6.5 cycles. Transformer Power Factor Test. Secondary Cable Test. Transformer Maintenance. Relay Fault Pressure Test. Reversing Switch Check. Oil Sampling MT, TC. 3.33 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 08:00 14-May-26 16:00 ENMAX Outage 8.5TR (SS-8) Transformer Power Factor Test. Transformer Maintenance. Relay Fault Pressure Test. Oil Sampling MT, TC. 3.33 Days
Continuous		  
11-May-26 09:00 12-May-26 15:00 ATCO, ALBIAN Outage 920s 901T (920s Jackpine), 920s A1 (920s Jackpine), 920s 901 (920s Jackpine), 920s 901TD (920s Jackpine) 901T outage for CNRL to troubleshoot problems on their system 30 Hours
Continuous		  
11-May-26 09:00 15-May-26 16:00 ATCO TE ATCO Telecom Equipment EOL Radio Replacement Codesa to Jean Cote
Removal of constellation radio, replace with IRU600
THE FOLLOWING TRAFFIC WILL BE IMPACTED FOR THE DURATION OF THE RADIO REPLACEMENT:
7L75 A&B - WEST PEACE / FRIEDENSTAL
7L75 RAS A&B - WEST PEACE / KSITUAN		 4.29 Days
Continuous		  
11-May-26 09:00 11-May-26 17:00 ALTALINK Outage 291s T1 (291s Cochrane), 291s 1 (291s Cochrane) install full loops for LA grounds on high side and low side 8 Hours
Daily		  
11-May-26 09:00 11-May-26 18:00 ALTALINK Outage 185s 252 (185s Bretville), 185s 152 (185s Bretville), 286s 605 (286s Yasa), 605L (185s Bretville - 286s Yasa) transmission line maintenance 9 Hours
Continuous		  
11-May-26 09:45 12-May-26 17:45 ALTALINK Outage 171s 735X (171s Redwater), 233s 735N (233s Beamer), 735L (171s Redwater - 233s Beamer) transmission line maintenance 1.33 Days
Continuous		  
11-May-26 10:00 11-May-26 17:00 ALTALINK RB 158s 763N (158s Vauxhall), 28s 47 (28s West Brooks), 28s 31 (28s West Brooks), 447s 763A (447s Enchant), 763AL (447s Enchant - 763A1L tap), 763L (158s Vauxhall - 763AL tap), 763L (28s West Brooks - 763AL tap) damper change on 763AL123, damper wearing through conductor (live line work) 7 Hours
Continuous		  
11-May-26 13:00 14-May-26 09:00 ATCO Outage 2033s 703C (2033s Mowat) PRC trip coil testing and protection testing 2.83 Days
Continuous		  
11-May-26 13:00 14-May-26 13:00 ATCO Outage 827s SVC (827s Cranberry Lake), 827s 703 (827s Cranberry Lake) SVC maintenance 3 Days
Continuous		  
11-May-26 13:30 14-May-26 17:00 ALTALINK Outage 38s 7452 (38s East Edmonton) 240kV breaker maintenance 3.15 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 07:00 13-May-26 18:00 ALTALINK, ICPCL Outage 225L (225s Magrath - 225AL tap), 225L (67s Stirling - 225AL tap), 225AL (313s Raymond Reservoir - 225L tap), 67s 225 (67s Stirling), 225s 225E (225s Magrath) 93, 149 replace arms and insulators 1.46 Days
Continuous		  
12-May-26 07:00 19-May-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) relay isolation for 50BF/705 and 50BF/706 for settings update 7.44 Days
Continuous		  
12-May-26 07:30 13-May-26 16:30 ALTALINK Outage 157s 788N (157s Lac La Biche), 157s 728W (157s Lac La Biche), 157s 652 (157s Lac La Biche), 157s 3 (157s Lac La Biche), 157s T1 (157s Lac La Biche), 157s 138kV Bus 1 (157s Lac La Biche) Installing new screw piles 1.38 Days
Continuous		  
12-May-26 08:00 13-May-26 16:00 ATCO Outage 6L05 (757s Battle River - 843s Bigknife Creek), 6LA05 (843s Bigknife Creek - 765s Mannix Mine), 757s 602 (757s Battle River) line to ground clearance mitigation, structures 2A, 3A, 5A, 6A 1.33 Days
Continuous		  
12-May-26 08:00 14-May-26 16:00 ALTALINK TE 349s Protection & Control (349s Stavely) move relay to new City of Lethbridge communication system 2.33 Days
Continuous		  
12-May-26 08:00 14-May-26 17:00 Lethbridge TE 181s Protection & Control (181s Chinook) protection outages on 181s RAS AIS 1147 'A' & 'B' protections to transfer TPR (teleprotection) circuits from existing JMUX to new SEL ICON 2.38 Days
Continuous		  
12-May-26 08:00 12-May-26 17:00 ALTALINK Outage 291s T2 (291s Cochrane) install full loops for LA grounds on high side and low side of transformer 9 Hours
Daily		  
12-May-26 08:00 12-May-26 17:00 ALTALINK Outage 422s 694 (422s Westwood), 54s 694 (54s Fort Saskatchewan), 694L (54s Fort Saskatchewan - 422s Westwood) Replacing cross arms and insulators on structure 6
Replacing OHSW bayonet on structure 8 		9 Hours
Continuous		  
12-May-26 08:00 12-May-26 17:00 ALTALINK Outage 77s 26 (77s Sagitawah) 240kV breaker maintenance 9 Hours
Continuous		  
12-May-26 08:00 13-May-26 17:00 ALTALINK TE AltaLink Telecom Equipment microwave upgrade hop between 618s Riverbend to 225s Magrath 1.38 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		  
12-May-26 08:00 13-May-26 16:00 ATCO, ALTALINK RB 788L (898s Heart Lake - 788AL tap) reclosing blocked on 788L for AltaLink work 1.33 Days
Continuous		  
12-May-26 08:00 12-May-26 16:00 ENMAX TE Protection & Control (SS-65) 65 sub 86BF D134 lockout relay protection outage - relays, lockout testing 65RLY240-D134 8 Hours
Continuous		  
12-May-26 09:00 12-May-26 16:00 ATCO TE ATCO Telecom Equipment, 893s RTU/SCADA (893s Cavendish) Cappon_T-Telecom/Cavendish_S-Telecom- radio major maintenance. 7 Hours
Continuous		  
12-May-26 12:00 15-May-26 14:00 ATCO TE ATCO Telecom Equipment Chard telecom replacing 3.08 Days
Continuous		  
13-May-26 06:00 13-May-26 17:00 ATCO TE ATCO RTU/SCADA SOC2 Backup Control Centre activation 11 Hours
Continuous		  
13-May-26 07:00 14-May-26 18:00 ALTALINK Outage 761L (38s East Edmonton - 71s Lamoureux), 71s 652 (71s Lamoureux), 38s 761N (38s East Edmonton), 71s 552 (71s Lamoureux) North Crew will be replacing arms and insulation 1.46 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 08:00 13-May-26 17:00 ALTALINK Outage 77s 40 (77s Sagitawah) breaker maintenance 9 Hours
Continuous		  
13-May-26 08:00 14-May-26 16:00 ENMAX Outage 2.80L (SS-2 - SS-23), 23B138-2.80 (SS-23), 2MD138-2.80 (SS-2) 23B138-2.80 rebuild dash pot, low oil, breaker SF6 gas sample 1.33 Days
Continuous		  
13-May-26 08:00 14-May-26 16:00 ATCO RB 7L34 (815s Goodfare - 886s Updike) walk up and climbing inspection 1.33 Days
Continuous		  
13-May-26 08:00 13-May-26 16:00 ENMAX TE Protection & Control (SS-65) 65 sub 86BF D133 lockout relay protection outage - relays, lockout testing 65RLY240-D133 8 Hours
Continuous		  
13-May-26 08:00 13-May-26 16:30 ATCO, ALTALINK RB 9L938 (77s Sagitawah - 809s Louise Creek) reclosing blocked for AltaLink 8.5 Hours
Continuous		  
13-May-26 08:00 13-May-26 16:00 ENMAX Outage 3.3TR (SS-3) 3 sub - switchgear cleaning - 3.3TR secondary cable compartment 8 Hours
Continuous		  
13-May-26 08:30 14-May-26 16:00 ALTALINK TE 562s Protection & Control (562s Cypress) 562s RAS relay maintenance, Non redundant, RAS33, RAS112, RAS 27. One a time. 31.5 Hours
Continuous		  
13-May-26 08:30 13-May-26 17:30 ALTALINK IO 67s 225 (67s Stirling) CRU upgrade for ACC visibility 9 Hours
Daily		  
13-May-26 09:00 14-May-26 15:00 ATCO, ALBIAN Outage 9LJH2 (919s Hartley - 920s Jackpine), 920s 902T (920s Jackpine), 920s 902 (920s Jackpine), 919s 907 (919s Hartley), 920s B1 (920s Jackpine), 920s 902TD (920s Jackpine) isolation of 902T for CNRL to troubleshoot problems on their system 30 Hours
Continuous		  
13-May-26 09:00 13-May-26 16:00 ATCO TE ATCO Telecom Equipment, 914s RTU/SCADA (914s Bindloss) Cappon_T-Telecom/Bindloss_S-Telecom- RADIO Major DIGITAL PHOENIX G2 2GHZ PM(to Bindloss) Radio A, the Radio B..IMPACT TO THE FOLLOWING TRAFFIC: 7L760 / 7LA760 BF DTT, BINDLOSS SUB SCADA 7 Hours
Continuous		  
13-May-26 09:00 14-May-26 17:00 ALTALINK TE 67s RTU/SCADA (67s Stirling) CRU upgrade - supervisory outage to complete upgrades to RTU and alarm splitting 1.33 Days
Daily		  
13-May-26 09:00 14-May-26 17:00 ALTALINK TE 67s Protection & Control (67s Stirling) upgrade CRU - alarm splitting, protection outages on 508L A/B protections to complete scope 1.33 Days
Daily		  
14-May-26 05:30 14-May-26 07:00 ATCO TE ATCO Telecom Equipment, ATCO EMS/ICCP Outage replace the old HP and mobile firewalls at Vegreville and install some new networking cards on the Low BES VPN firewalls 90 Mins
Continuous		  
14-May-26 07:00 14-May-26 18:00 ALTALINK Outage 880L (321s Al Rothbauer - 523s Bullshead), 321s 880 (321s Al Rothbauer), 523s 880 (523s Bullshead) re-installing damper on structure 4, re-tying OHSW's on structure 8 11 Hours
Daily		  
14-May-26 08:00 14-May-26 17:00 ALTALINK Outage 77s 552 (77s Sagitawah) 138kV breaker maintenance 9 Hours
Continuous		  
14-May-26 08:00 14-May-26 16:00 ENMAX TE Protection & Control (SS-65) 65 sub 86BF D132 lockout relay protection outage, relays, lockout testing 65RLY240-D132 8 Hours
Continuous		  
14-May-26 08:00 14-May-26 16:00 ALTALINK TE 42s Protection & Control (42s Sarcee) urgent - complete card replacements and firmware upgrade on relay to correct communications failure, 3L B21/79/L8 URD60 out of service 8 Hours
Continuous		  
14-May-26 08:00 14-May-26 11:00 Lethbridge TE 241s Protection & Control (241s Uplands) 241s 138kv Bus Protection (SEL 487b) outage to add logic for DDR initiate and test output circuits, Will lose buss differential (87) while relay is OOS 3 Hours
Continuous		  
14-May-26 09:30 15-May-26 16:00 ATCO TE 840s RTU/SCADA (840s McNeill Station) moving communication and SCADA traffic onto new star link device 30.5 Hours
Continuous		  
14-May-26 12:00 14-May-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) RTU mitigations and reboot 5 Hours
Continuous		 AB-MATL
15-May-26 07:00 15-May-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) blocking 21B/6L126 relay for some settings changes 10.5 Hours
Continuous		  
15-May-26 07:15 17-May-26 18:00 ALTALINK Outage 305s 677 (305s Acheson), 595s 677 (595s Spruce Grove), 677L (305s Acheson - 595s Spruce Grove) transmission line maintenance 2.45 Days
Continuous		  
15-May-26 08:00 18-May-26 16:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) split the existing SCADA VLAN from 1 to 1 and 2

3.33 Days
Continuous		  
15-May-26 08:00 15-May-26 12:00 ENMAX Outage 22.81L (SS-22 - SS-39), 22.2TR (SS-22), 22B138-22.81 (SS-22), 22B138-22BT8 (SS-22), SW85 (SS-22), 39B138-22.81 (SS-39) spring substation washing 4 Hours
Continuous		  
15-May-26 08:00 27-May-26 16:00 ENMAX Outage 1.5TR (SS-1) connect transformer secondary cables to 1B8-1.5TR 12.33 Days
Continuous		  
15-May-26 09:00 25-May-26 17:00 BCH Outage 2L113 (BCH Cranbrook - BCH Natal), 2D23 (BCH Nelway), 2D21 (BCH Natal) install marker balls 10.33 Days
Continuous		 AB-BC
15-May-26 12:00 15-May-26 18:00 ENMAX Outage 13.82L (SS-13 - SS-22), 22.3TR (SS-22), 22.1TR (SS-22), 13B138-13.82 (SS-13), 22B138-13.82 (SS-22), 22B138-22BT8 (SS-22), SW83 (SS-22), SW84 (SS-22) spring substation washing 6 Hours
Continuous		  

Prepared On:   2026-05-06   14:31:53

This document and the information contained herein are based upon information and data which by their nature contain a degree of uncertainty and are subject to change. In addition, this document may contain information and data from public sources and/or third parties, which have been assumed to be accurate and complete and have not been verified. Accordingly, the Independent System Operator, operating as the Alberta Electric System Operator (the "AESO") makes no warranty, representation or guarantee, express or implied, with respect to this document or the information contained herein, including, but not limited to, any warranty, representation or guarantee of accuracy, completeness, timeliness, reliability, availability, absence of computer virus, non- infringement, merchantability or suitability for any purpose. Under no circumstances will the AESO, its members, officers, employees, contractors or agents, or any of their respective affiliates, be liable for any errors or omissions in, or any losses, damages or claims whatsoever, whether in contract, tort or otherwise, arising from use of or reliance upon, this document or any information contained herein.

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