Alberta Electric System Operator
System Co-ordination Plan
2026-04-30 to 2026-05-08
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		  
31-Mar-25 07:00 01-May-26 17:00 EPCOR TE Protection & Control (Woodcroft) Woodcroft: protection blocking for merging unit and protection upgrade. 396.42 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		  
12-Jan-26 07:00 01-May-26 17:00 EPCOR TE Protection & Control (Rossdale) protection blocking, relay maintenance 109.38 Days
Continuous		  
17-Jan-26 11:00 30-Apr-26 17:00 BHE Canada Outage 120s C2 (120s Picture Butte) forced outage 103.21 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		  
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		  
30-Mar-26 08:30 04-May-26 16:30 ALTALINK Outage 62s T1 (62s Brazeau Plant), 62s 1 (62s Brazeau Plant) maintenance 35.33 Days
Continuous		  
06-Apr-26 07:00 01-May-26 17:00 EPCOR Outage 72JM18 (EP 805s Jasper - Meadowlark), T1 (Meadowlark), M721 (Meadowlark), M722 (Meadowlark), EP 805s J722 (EP 805s Jasper), EP 805s JDS29 (EP 805s Jasper), MAB1 (Meadowlark) Meadowlark - T1 LCR demo 25.42 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 13-May-26 07:00 EPCOR Outage 72RW3 (Rossdale - Woodcroft), RW727 (Rossdale) termination rebuild at the Woodcroft end 33.58 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 01-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 17.42 Days
Continuous		  
17-Apr-26 08:00 01-May-26 16:00 Syncrude Outage 1834 (Syncrude Mildred Lake), 1835 (Syncrude Mildred Lake), Mildred T18 (Syncrude Mildred Lake) T18 6-year maintenance 14.33 Days
Continuous		  
20-Apr-26 07:00 01-May-26 17:00 EPCOR Outage T4 (Rossdale), R724 (Rossdale), RR729 (Rossdale), RAB4 (Rossdale) transformer T4 zone doble, repairs 11.42 Days
Continuous		  
20-Apr-26 07:00 30-Apr-26 18:00 ALTALINK RB 974L (39s Bickerdike - 310p Sundance) transmission line maintenance 10.46 Days
Continuous		  
20-Apr-26 07:00 30-Apr-26 18:00 ALTALINK RB 973L (39s Bickerdike - 310p Sundance) transmission line maintenance 10.46 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		  
20-Apr-26 08:00 30-Apr-26 16:00 ALTALINK TE 87s Protection & Control (87s Gaetz) setting and wiring change 10.33 Days
Continuous		  
20-Apr-26 14:31 01-May-26 17:00 ATCO Outage 951s 920C (951s Thickwood) 920C cap at 951s Thickwood unavailable, forced outage 11.1 Days
Continuous		  
21-Apr-26 09:00 15-May-26 16:00 ALTALINK Outage 394s T3 (394s Empress), 394s 36 (394s Empress) 394sT3 CT7 replacement, cable repair 24.29 Days
Continuous		  
21-Apr-26 15:00 06-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 14.75 Days
Continuous		  
21-Apr-26 15:00 04-May-26 09:00 ALTALINK IO 1182s 4 (1182s Berland River) complete commissioning on 1182s8 12.75 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		  
22-Apr-26 09:30 05-May-26 16:30 ATCO, ALTALINK IO 6L126 (743s Sarah Lake - 515L tap), 126L1 (6L126 tap) 743S Sarah Lake rebuild and replace H-Frame structure and 72 kV switches 13.29 Days
Continuous		  
22-Apr-26 10:00 05-May-26 16:00 ATCO, ALTALINK Outage 743s 72kV Bus 600BS1 (743s Sarah Lake), 6L126 (743s Sarah Lake - 515L tap), 6L96 (735s Swan River - 743s Sarah Lake), 6L11 (743s Sarah Lake - 854s Swan Dive), 743s 705 (743s Sarah Lake), 743s 601 (743s Sarah Lake), 743s 603 (743s Sarah Lake), 743s 604 (743s Sarah Lake), 743s 605 (743s Sarah Lake), 743s 501 (743s Sarah Lake), 735s 604 (735s Swan River) 743S Sarah Lake rebuild, 72 kV bus outage and replace wood H-Frame structure and 72 kV switches 13.25 Days
Continuous		  
24-Apr-26 07:00 04-May-26 17:00 ALTALINK Outage 238s T1 (238s Shell Harmattan) maintenance 10.42 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		  
24-Apr-26 08:00 01-May-26 17:00 ATCO TE 7L20 (810s Dome Cutbank - 7L228 tap), 7L20 (740s H.R. Milner - 810s Dome Cutbank) 7L20 A relay failed 7.38 Days
Continuous		  
25-Apr-26 08:00 27-Jun-26 16:00 ENMAX Outage 1.82L (SS-1 - 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) 1 sub Transmission line cut over 63.33 Days
Continuous		  
26-Apr-26 09:00 30-Apr-26 17:00 BCH, BPA Outage 5L52 (BPA Custer - BCH Ingledow) doble and inspection 4.33 Days
Continuous		 AB-BC
27-Apr-26 07:00 30-Apr-26 17:00 EPCOR Outage 1055L (629s Argyll Transfer Station - 816s Petrolia), 240BA3 (629s Argyll Transfer Station - 814s Bellamy), 816s P2402 (816s Petrolia), 816s P2403 (816s Petrolia) 1055L/Petrolia: SA/CT/CVT Doble and PDS4/PDS5 Disconnect Maintenance and Aerial Washing Program 3.42 Days
Continuous		  
27-Apr-26 07:00 30-Apr-26 17:30 ALTALINK, EPCOR RB 1056L (89s Ellerslie - 629s Argyll Transfer Station) aerial structure refurbishment and washing program 3.44 Days
Continuous		  
27-Apr-26 07:00 01-May-26 16:00 ALTALINK Outage AML 511s T30 (AML 511s Crossings), AML 511s 1152 (AML 511s Crossings), AML 511s SVC Plus (AML 511s Crossings) firmware upgrades on protections that are out of service 4.38 Days
Continuous		  
27-Apr-26 07:00 01-May-26 17:00 ALTALINK Outage 174L (197s Bardo - 289s Saunders Lake), 197s 174W (197s Bardo) 174L replace structure 123 and install new structure 122A for customer line move project 4.42 Days
Continuous		  
27-Apr-26 07:00 01-May-26 15:00 CMH Outage MH-30L (MHS-3 Southridge - MHS-5 NE Crescent Heights), MHS-3 MH69-308 (MHS-3 Southridge), MHS-5 MH69-502 (MHS-5 NE Crescent Heights), MHS-3 MH69-307 (MHS-3 Southridge), MHS-5 MH69-501 (MHS-5 NE Crescent Heights) breaker maintenance 4.33 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 01-May-26 14:00 ALTALINK, EPCOR Outage 920L (37s North Calder - 557s Castle Downs), 37s T6 (37s North Calder), 37s 4 (37s North Calder), 37s 88 (37s North Calder), 37s 81 (37s North Calder), 37s 82 (37s North Calder), 37s 87 (37s North Calder) P&C upgrades 4.25 Days
Continuous		  
27-Apr-26 08:00 01-May-26 14:00 ALTALINK, EPCOR RB 920L (37s North Calder - 557s Castle Downs) Altalink working on 37s North Calder 4.25 Days
Continuous		  
27-Apr-26 08:00 01-May-26 14:00 ALTALINK, EPCOR Outage 920L (37s North Calder - 557s Castle Downs), 37s 87 (37s North Calder) Altalink outage: work on 37s 4.25 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 30-Apr-26 16:00 ENMAX Outage 22.2TR (SS-22) tap changer inspection - 22.2-X-TC, 22.2-Y-TC, oil sampling MT, TC(X), TC(Y) 3.33 Days
Continuous		  
27-Apr-26 08:00 01-May-26 16:00 ENMAX Outage 12.2TR (SS-12) transformer power factor test, secondary cable test, transformer maintenance, relay fault pressure test, oil sampling MT, TC 4.33 Days
Continuous		  
27-Apr-26 08:00 30-Apr-26 16:00 ENMAX Outage 21.1C (SS-21) relays, lockout testing 21RLY138-21.Z31, 21RLYCS138-21CAP, relay protection test - 21RLY138-21CAP 3.33 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 09:00 01-May-26 18:00 ATCO, ALTALINK IO 953L (574s Nilrem - 755s Cordel) switch and breaker maintenance 4.38 Days
Continuous		  
27-Apr-26 09:00 01-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
27-Apr-26 09:30 01-May-26 17:30 ATCO, ALTALINK Outage 9L953 (574s Nilrem - 755s Cordel), 755s 905 (755s Cordel), 755s 906 (755s Cordel) PRC-005-trip coil testing, breaker and switch mitigation and replacement 4.33 Days
Continuous		  
27-Apr-26 09:30 30-Apr-26 17:00 ALTALINK, EPCOR RB 1056L (89s Ellerslie - 629s Argyll Transfer Station) aerial structure refurbishment and washing program 3.31 Days
Continuous		  
27-Apr-26 09:30 01-May-26 17:30 ATCO TE 755s Protection & Control (755s Cordel) test switch mitigation and replacement: 87A/9L953, 21B/9L953, 50BF/906BF 4.33 Days
Continuous		  
27-Apr-26 11:00 05-May-26 16:00 ATCO TE ATCO Telecom Equipment, 875s RTU/SCADA (875s Algar), 917s RTU/SCADA (917s Horse River), 907s RTU/SCADA (907s Waddell) radio replacement 8.21 Days
Continuous		  
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		  
27-Apr-26 12:00 04-May-26 12:00 ATCO Outage 730s STATCOM (730s Rycroft), 730s 705 (730s Rycroft), 730s 702T (730s Rycroft) svc fire system and annual inspection at Rycroft 730s 7 Days
Continuous		  
27-Apr-26 13:30 30-Apr-26 16:00 ALTALINK Outage 310p T36 (310p Sundance) T36 transformer maintenance 3.1 Days
Continuous		  
28-Apr-26 07:00 04-May-26 17:30 ATCO TE 743s Protection & Control (743s Sarah Lake) 50BF/704 relay settings change and testing 6.44 Days
Continuous		  
28-Apr-26 08:00 30-Apr-26 16:00 ALTALINK TE APS# 217 180L- Fort Macleod 15S Overload Mitigation move relay to new city of Lethbridge communication system 2.33 Days
Continuous		  
28-Apr-26 08:00 30-Apr-26 17:00 Lethbridge TE APS# 169 725LW-674S Overload Mitigation protection outages on 674s 725LW RAS 169 'A' & 'B' protections to transfer TPR (teleprotection) circuits from existing JMUX to new SEL ICON 2.38 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		  
28-Apr-26 09:00 01-May-26 12:00 ATCO Outage 930s SVC (930s Arcenciel), 930s 701T (930s Arcenciel) SVC air cooled maintenance 3.13 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 30-Apr-26 17:00 ALTALINK RB 1071L (205s Castle Rock Ridge - 312s Fidler), 205s 352 (205s Castle Rock Ridge), 205s 452 (205s Castle Rock Ridge), 312s 852 (312s Fidler), 312s 952 (312s Fidler) replace Both OH support hardware assembly's structures 2 and 37, aligned with 26-10472 1072L RB and 26-10481 994L RB 1.38 Days
Continuous		  
29-Apr-26 08:00 30-Apr-26 17:00 ALTALINK RB 1072L (103s Goose Lake - 205s Castle Rock Ridge), 103s 252 (103s Goose Lake), 103s 352 (103s Goose Lake), 205s 152 (205s Castle Rock Ridge), 205s 252 (205s Castle Rock Ridge) replace Both OH support hardware assembly's structure 2, Required for 26-10467 1071L RB , See also 26-10481 994L RB that goes with these 1.38 Days
Continuous		  
29-Apr-26 08:00 30-Apr-26 16:00 ALTALINK RB 994L (103s Goose Lake - 312s Fidler), 103s 552 (103s Goose Lake), 103s 652 (103s Goose Lake), 312s 552 (312s Fidler), 312s 952 (312s Fidler) replace Both OH support hardware assembly's structure 37, aligned with 26-10472 1072L RB and 26-10467 1071L RB 1.33 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 08:30 30-Apr-26 16:30 ENMAX, ALTALINK Outage 5s C3 (5s East Calgary), 5s C4 (5s East Calgary) 5s752 maint. and PRC5 checks no first trip required
5sC3 and C4 weed spraying		 1.33 Days
Continuous		  
29-Apr-26 09:00 30-Apr-26 17:00 ALTALINK Outage 410s 1052 (410s Josephburg) PRC5 breaker maintenance, tank heater replacement & first trip 1.33 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		  
30-Apr-26 07:00 30-Apr-26 17:00 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 10 Hours
Continuous		  
30-Apr-26 07:30 30-Apr-26 07:45 CMH TE Medicine Hat ICCP Outage plugging in ICCP router to a new UPS system 15 Mins
Continuous		  
30-Apr-26 08:00 30-Apr-26 16:00 ALTALINK Outage 332s T1 (332s Ellis), 332s 111 (332s Ellis) work on the NGR 8 Hours
Continuous		  
30-Apr-26 08:00 30-Apr-26 16:00 ALTALINK TE 197s RTU/SCADA (197s Bardo) split the existing SCADA VLAN from 1 to 1 and 2
8 Hours
Continuous		  
30-Apr-26 08:00 30-Apr-26 16:30 ALTALINK Outage 739L (14s Devon - 155s Blackmud), 14s 739E (14s Devon), 155s 739 (155s Blackmud) 138 kV breaker maintenance 8.5 Hours
Continuous		  
30-Apr-26 08:00 30-Apr-26 16:00 ENMAX TE RTU/SCADA (SS-10) SCADA RTU test - RTU-10, SCADA alarm test - RTU-10 ANN 8 Hours
Daily		  
30-Apr-26 09:00 30-Apr-26 16:00 ATCO TE 917s RTU/SCADA (917s Horse River), ATCO Telecom Equipment updates to the firewall and LAN configuration on Horse River telecom during the EOL radio upgrade 7 Hours
Continuous		  
30-Apr-26 12:00 30-Apr-26 17:00 ALTALINK TE 120s RTU/SCADA (120s Picture Butte) urgent RTU mitigations and reboot 5 Hours
Continuous		 AB-MATL
01-May-26 08:00 01-May-26 16:00 ALTALINK Outage 332s T2 (332s Ellis), 332s 122 (332s Ellis) work on the NGR 8 Hours
Continuous		  
01-May-26 08:00 01-May-26 17:00 ALTALINK TE 410s RTU/SCADA (410s Josephburg), 452s RTU/SCADA (452s B.F. Goodrich Fort Saskatchewan), AltaLink Telecom Equipment upgrading VLAN, MPLS, and firewall 9 Hours
Continuous		  
01-May-26 08:00 01-May-26 16:00 ENMAX TE Protection & Control (SS-2) 2 sub 86 BF-D94 protection outage - relays, lockout testing 8 Hours
Continuous		  
01-May-26 08:00 01-May-26 16:00 ENMAX TE RTU/SCADA (SS-40) SCADA RTU test - RTU-40, SCADA alarm test - RTU-40 ANN 8 Hours
Daily		  
01-May-26 09:00 03-May-26 17:00 ALTALINK Outage 719L (378s Shell Caroline - 575s Sundre), 575s 719N (575s Sundre), 378s 719X (378s Shell Caroline) replace 575s719N breaker CT`s 2.33 Days
Continuous		  
01-May-26 09:30 01-May-26 17:30 ATCO, BSRW TE 363s RTU/SCADA (363s Sedalia), 363s Protection & Control (363s Sedalia) 87L-21B/9LA46 relay settings update at 363s Sedalia
 8 Hours
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 16:00 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) 6.08 Days
Continuous		  
01-May-26 17:00 25-Nov-26 17:00 EPCOR Outage T1 (Meadowlark) T1 LCR civil work 208.04 Days
Continuous		  
02-May-26 07:00 02-May-26 17:00 EPCOR TE 665s RTU/SCADA (665s Dome) substation firewall replacement 10 Hours
Continuous		  
02-May-26 08:00 02-May-26 16:00 ALTALINK TE 268s RTU/SCADA (268s Whitecourt) split the existing SCADA VLAN 8 Hours
Continuous		  
02-May-26 08:00 03-May-26 16:00 ENMAX TE RTU/SCADA (SS-25) 25 sub SDN / RTU upgrade. Disconnecting / reconnecting cables. Relabel DPAC inputs. Replace existing RTU at 25 sub. 1.33 Days
Daily		  
02-May-26 08:00 03-May-26 16:00 ENMAX TE Protection & Control (SS-25) 25sub RAS A and B protection scheme outage. 25 sub SDN / RTU upgrade. Disconnecting / reconnecting cables 1.33 Days
Daily		  
03-May-26 08:00 03-May-26 16:00 ALTALINK TE 364s RTU/SCADA (364s Whitecourt Industrial) Split the existing SCADA VLAN. Loss of 364s visibility for up to 15 minutes while updating SCADA LAN switch settings.
8 Hours
Continuous		  
03-May-26 12:00 04-May-26 16:00 ATCO RB 7L48 (794s Valleyview - 7LA48 tap), 7L48 (787s High Prairie - 7L48 tap) tightening loose hardware on a cross arm 28 Hours
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 10-May-26 17:00 EPCOR Outage 557s T2 (557s Castle Downs), 557s CD2403 (557s Castle Downs), 557s CD2404 (557s Castle Downs), 557s CDAB2 (557s Castle Downs) Castledowns: TX2 tap changer 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) Jasper: TX4 Relay Maintenance 4.42 Days
Continuous		  
04-May-26 07:00 05-May-26 15:00 CMH Outage MHS-5 MH69-510 (MHS-5 NE Crescent Heights) Perform visual, mechanical, and electrical inspections/testing on MH69-510 breaker.
Remove, filter, and refill with insulating oil. 		1.33 Days
Continuous		  
04-May-26 07:00 05-May-26 17:00 EPCOR Outage T1 (Kennedale), K721 (Kennedale), K722 (Kennedale) Kennedale: TX1 Zone, Relay Maintenance 1.42 Days
Continuous		  
04-May-26 07:00 05-May-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) SCADA change for CETO project 1.42 Days
Continuous		  
04-May-26 07:00 04-May-26 17:00 EPCOR TE 72CH9 (987s Clover Bar - EP Hardisty), 72CH11 (987s Clover Bar - EP Hardisty) protection blocking, DC supply cutover on B protection 10 Hours
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 07:30 05-May-26 18:00 ALTALINK RB 256s 719N (256s Harmattan), 575s 719X (575s Sundre), 719CL (412s Shell Eagle Creek - 719L tap), 719L (256s Harmattan - 719CL tap), 719L (575s Sundre - 719CL tap) 719CL39 conductor repair & 719CL54 damper replacement 1.44 Days
Daily		  
04-May-26 08:00 24-May-26 16:00 Syncrude Outage Mildred T6 (Syncrude Mildred Lake), 635 (Syncrude Mildred Lake) SCL - repair tap changer in T6 transformer 20.33 Days
Continuous		  
04-May-26 08:00 07-May-26 16:00 ALTALINK TE 29s RTU/SCADA (29s Cascade), AltaLink Telecom Equipment 2026 firewall program - 1 firewall, 1 mpls node 3.33 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 11.38 Days
Continuous		 AB-BC
04-May-26 08:00 05-May-26 17:00 ALTALINK RB 263s 719 (263s Strachan), 378s 552 (378s Shell Caroline), 634s 719 (634s Shell Raven River), 719AL (581s Amoco Ricinus - 719L tap), 719BL (634s Shell Raven River - 719L tap), 719L (263s Strachan - 719AL tap), 719L (378s Shell Caroline - 719BL tap) center phase damper not installed correctly, re install damper 1.38 Days
Continuous		  
04-May-26 08:00 05-May-26 16:00 ALTALINK TE 618s Protection & Control (618s Riverbend) move relay to new City of Lethbridge communication system
1.33 Days
Continuous		  
04-May-26 08:00 05-May-26 17:00 Lethbridge TE 593s Protection & Control (593s Lakeview) transfer TPR (Teleprotection) circuit from existing JMUX to new SEL ICON 1.38 Days
Continuous		  
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 04-May-26 16:00 ALTALINK TE 325s RTU/SCADA (325s Leduc) split the existing SCADA VLAN 8 Hours
Continuous		  
04-May-26 08:00 04-May-26 16:00 ENMAX RB 6.82L (SS-6 - SS-41) tree trimming 8 Hours
Continuous		  
04-May-26 08:00 05-May-26 16:00 ENMAX Outage 16.61L (SS-16 - SS-27), 16B69-16.61 (SS-16), 27B69-16.61 (SS-27) breaker maintenance 1.33 Days
Continuous		  
04-May-26 08:00 06-May-26 16:00 ALTALINK TE 595s RTU/SCADA (595s Spruce Grove), AltaLink Telecom Equipment firewall replacement, LAN switch replacement, firmware 7705A upgrade, raw socket conversion 2.33 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 05-May-26 16:00 ENMAX TE RTU/SCADA (SS-39) SCADA RTU test and alarm test 1.33 Days
Daily		  
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) Kinbrook Addition to 2075s 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), 2029s T11D1 (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), 2075s T11D1 (2075s Newell) annual EATL outage 14.35 Days
Continuous		  
04-May-26 09:00 04-May-26 16:00 ALTALINK Outage 254s T2 (254s Coaldale), 254s 35 (254s Coaldale) repair/complete lightning arrestor grounding on T2 7 Hours
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 11:00 05-May-26 17:00 ATCO, ALTALINK Outage 953L (574s Nilrem - 755s Cordel) Transmission line maintenance 30 Hours
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		  
04-May-26 12:30 04-May-26 17:30 ALTALINK RB 700L (422s Westwood - 746L tap), 700L (746s Sherwood Park - 746L tap) transmission line maintenance 5 Hours
Continuous		  
04-May-26 17:00 06-May-26 17:00 ALTALINK Outage 437s T1 (437s Baymag) the plant site will need to be isolated from the utility supply for two days to perform annual maintenance 2 Days
Continuous		  
04-May-26 17:00 06-May-26 17:00 ALTALINK Outage 437s T2 (437s Baymag) the plant site will need to be isolated from the utility supply for two days to perform annual maintenance 2 Days
Continuous		  
05-May-26 07:00 06-May-26 18:30 ALTALINK Outage 717L (17s Benalto - 262s Rocky Mountain House), 262s 717E (262s Rocky Mountain House) Test CT8 to determine if type CT needs to be scheduled for replacement 1.48 Days
Continuous		  
05-May-26 07:00 06-May-26 19:00 ALTALINK, ENBRIDGE Outage 865L (38s East Edmonton - 216s Knightsbridge), 741L (216s Knightsbridge - 317s Baseline), 216s T1 (216s Knightsbridge), 317s T1 (317s Baseline), 317s T2 (317s Baseline), 216s 138kV Bus (216s Knightsbridge), 216s 865X (216s Knightsbridge), 216s 741X (216s Knightsbridge), 216s 29 (216s Knightsbridge), 38s 865N (38s East Edmonton), 317s 1 (317s Baseline) 216s T1 metering, 216s PT1, 216s14 switch, 216s T1 NGR, 317s T2, 216s3, 216s741X, 216s8, 317s2, 317s8, 317s T1 maintenance and replacement 1.5 Days
Continuous		  
05-May-26 07:00 06-May-26 19:00 ALTALINK IO 216s 865X (216s Knightsbridge), 216s 741X (216s Knightsbridge), 216s 29 (216s Knightsbridge), 216s 26 (216s Knightsbridge), 216s T1 (216s Knightsbridge), 216s 138kV Bus (216s Knightsbridge), 741L (216s Knightsbridge - 317s Baseline), 865L (38s East Edmonton - 216s Knightsbridge) 216s3 switch adjustment, 216s741X breaker maintenance, 216s8 hot spot repair, 317s2, 317s8 cooper cutout replacement, 317s T1 metering repair and relay maintenance
1.5 Days
Continuous		  
05-May-26 07:00 05-May-26 18:00 ALTALINK, ATCO Outage 519AL (661s Laura Lake - 519L tap), 519L (519AL tap - 526L tap), 519L (996s Imperial Oil Carson Lake - 519AL tap), 996s 519 (996s Imperial Oil Carson Lake), 515s Fed Pipe Judy Creek, 785s Judy Creek Gas Plant, 638s Esso Judy Creek north Crew will be doing component replacement at 519L15 11 Hours
Continuous		  
05-May-26 07:00 06-May-26 18:00 ALTALINK RB 1047L (574s Nilrem - 650s Hansman Lake) arctic arrow will have a crew filling in wood pecker holes on structures 84, 181, 187, 189 1.46 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 05-May-26 16:00 ALTALINK TE 167s RTU/SCADA (167s Ipiatik Lake) split the existing SCADA VLAN 8 Hours
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 05-May-26 16:00 ENMAX RB 40.81L (SS-40 - SS-41) tree trimming 8 Hours
Continuous		  
05-May-26 08:00 06-May-26 16:00 ALTALINK TE 216s RTU/SCADA (216s Knightsbridge) T1 metering upgrades 1.33 Days
Continuous		  
05-May-26 08:00 05-May-26 16:00 ALTALINK TE 180s RTU/SCADA (180s Cope Creek) techs to investigate IED/CTRL IED trbl 8 Hours
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 08:30 05-May-26 16:00 ALTALINK TE 312s Protection & Control (312s Fidler) relay will be out of service to replace comm. cable blocks for this protection 7.5 Hours
Continuous		  
05-May-26 08:30 05-May-26 16:00 ALTALINK, VISIONREQ TE 354s Protection & Control (354s Summerview) investigate and replace DB25 connectors for 624L "B" protection @ 312s 7.5 Hours
Continuous		  
05-May-26 09:00 06-May-26 17:00 BCH Outage 5L98 (BCH Nicola - BCH Vaseux Lake) NIC 5CB51 rebuild 1.33 Days
Continuous		 AB-BC
05-May-26 09:00 05-May-26 10:00 ATCO TE ATCO Telecom Equipment, 825s Whitefish Lake whitefish Lake_S_Telecom-sub net 11 sar to v21 then v22. Impact to following traffic up to 1 hour:
9L22 B, 9L81 B, 9L37 B, 9L36 B, 9L960 A, 9L961 A		 60 Mins
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 07:30 06-May-26 15:00 CMH Outage MHS-5 MH69-507 (MHS-5 NE Crescent Heights), MHS-5 MH69-T52 (MH69s5 NE Crescent Height) perform breaker maintenance on MH69-507 7.5 Hours
Continuous		  
06-May-26 08:00 06-May-26 18:00 Syncrude TE Syncrude ICCP Outage SCADA - Server Update Whole Syncrude Visibility Loss 10 Hours
Daily		  
06-May-26 08:00 06-May-26 16:00 ALTALINK Outage 951L (132s Ware Junction - 275s Jenner) center phase socket clevis that holds yolk plate has a keeper key backed out str 164 8 Hours
Continuous		  
06-May-26 08:00 06-May-26 16:00 ALTALINK RB 132s 51 (132s Ware Junction), 132s 47 (132s Ware Junction), 275s 5 (275s Jenner), 275s 2269 (275s Jenner), 944L (132s Ware Junction - 275s Jenner) double circuit to 951L164 scope of work 8 Hours
Continuous		  
06-May-26 08:00 06-May-26 13:00 ALTALINK Outage 37s T3 (37s North Calder) P&C upgrades 5 Hours
Continuous		  
06-May-26 08:00 06-May-26 16:00 ATCO Outage 809s 701C (809s Louise Creek) ASEA IMBD CT testing 8 Hours
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 06-May-26 16:00 ALTALINK TE 183s RTU/SCADA (183s Underwood) split the existing SCADA VLAN
8 Hours
Continuous		  
06-May-26 08:00 07-May-26 17:00 ATCO, ALTALINK Outage 948L (650s Hansman Lake - 863s Paintearth), 863s 902 (863s Paintearth) transmission line maintenance 1.38 Days
Continuous		  
06-May-26 08:00 06-May-26 16:00 ENMAX RB 14.83L (SS-14 - SS-36) tree trimming 8 Hours
Continuous		  
06-May-26 08:00 06-May-26 16:00 ALTALINK, Lethbridge Outage 734L (241s Uplands - 370s North Lethbridge), 370s 734X (370s North Lethbridge) 734L open end outage at 241S to cutover CT circuits for new DDR installation & test 8 Hours
Continuous		  
06-May-26 08:00 06-May-26 16:00 ALTALINK, Lethbridge IO 734L (241s Uplands - 370s North Lethbridge) 734L Open End Outage at 241S to Cutover CT Circuits for NEW DDR Installation & Test required relays to DDR 8 Hours
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 16-May-26 16:00 Syncrude Outage UE-1 72-01 (UE-1 Syncrude Plant 30-2), UE-1 72-11 (UE-1 Syncrude Plant 30-2), UE-1 7201 (UE-1 Syncrude Plant 30-2), 1014 (Syncrude Mildred Lake), 1015 (Syncrude Mildred Lake), 1016 (Syncrude Mildred Lake), ML2 (Syncrude Mildred Lake - UE-1 Syncrude Plant 30-2) perform 72kV power line maintenance 10.33 Days
Continuous		  
06-May-26 08:00 06-May-26 16:00 ENMAX TE RTU/SCADA (SS-3) SCADA RTU/alarm test 8 Hours
Daily		  
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		  
06-May-26 12:31 06-May-26 16:30 ALTALINK Outage 37s T5 (37s North Calder) trip tests 3.98 Hours
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 07:30 07-May-26 15:00 CMH Outage MHS-5 MH69-514 (MHS-5 NE Crescent Heights), MH-60L (MHS-5 NE Crescent Heights - MHS-7 Brier Park), MHS-7 MH69-712 (MHS-7 Brier Park) perform breaker maintenance on MH69-514 breaker 7.5 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. This outage could last 90 mins. IMPACT TO THE FOLLOWING TRAFFIC: 7L574, 7L35 A - WOLF LAKE / PRIMROSE, 7L574, 7L35 B - WOLF LAKE / PRIMROSE, 7L574, 7L35 A - BOURQUE, 7L574, 7L35 B - BOURQUE / PRIMROSE 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
Comments: During this work,
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, GREENGATEP Outage 9L16 (755s Cordel - 972s Tinchebray) GOI is required on 907B to isolate 908/909 bay and new 9L16.
**THERE IS NO OUTAGE TO 9L16 UNTIL MAY 19, 2026		 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 10:30 07-May-26 13:30 ALTALINK Outage 37s 898 (37s North Calder), 898L (37s North Calder - 92s Viscount), 92s 898 (92s Viscount) trip testing 3 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 structure 261
Replacing insulators on structures 105A and 106A
1.46 Days
Continuous		  
08-May-26 08:00 08-May-26 16:00 ENMAX Outage 3.84L (SS-3 - SS-13) Shield wire corrosion testing. Power Factor Test - 3B138-3.84-CT 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 09:00 09-May-26 17:00 ATCO Outage 972s 240kV Bus 900BS2 (972s Tinchebray) Connect new 909A to 900BS2 1.33 Days
Continuous		  

Prepared On:   2026-04-29   14:57:09

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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