Alberta Electric System Operator
System Co-ordination Plan
2026-04-23 to 2026-05-01
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		  
11-Mar-26 13:45 26-Apr-26 16:00 ALTALINK Outage 535s C1 (535s Joffre) breaker maintenance 46.09 Days
Continuous		  
13-Mar-26 16:00 24-Apr-26 17:00 ATCO Outage 7L122 (791s Rainbow Lake - 930s Arcenciel), 791s 701 (791s Rainbow Lake) phase replacement 42.04 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 08:00 24-Apr-26 15:00 CMH TE MHS-7 Protection & Control (MHS-7 Brier Park) preventative maintenance 11.29 Days
Continuous		  
13-Apr-26 09:00 23-Apr-26 17:00 BCH RB 2L294 (BCH A. A. Lambert - BCH Cranbrook), 2L294 (BCH A. A. Lambert - BCH Nelway) ANRP for tree removal 10.33 Days
Daily		 AB-BC
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 27-Apr-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 13.42 Days
Continuous		  
16-Apr-26 07:00 29-Apr-26 17:00 EPCOR Outage 330P GT7 (330p Genesee), 330p 1215 (330p Genesee), 330p 1214 (330p Genesee) POW project installation 13.42 Days
Continuous		  
16-Apr-26 07:00 29-Apr-26 17:00 EPCOR Outage 330P GT7 (330p Genesee) POW project installation 13.42 Days
Continuous		  
17-Apr-26 08:00 28-Apr-26 16:00 ENMAX Outage 3.82L (SS-3 - SS-8), 3B138-3.82 (SS-3) City of Calgary traffic light rebuild 11.33 Days
Continuous		  
17-Apr-26 08:00 26-Apr-26 16:00 Syncrude Outage 1834 (Syncrude Mildred Lake), 1835 (Syncrude Mildred Lake), Mildred T18 (Syncrude Mildred Lake) T18 6-year maintenance 9.33 Days
Continuous		  
20-Apr-26 07:00 24-Apr-26 17:00 EPCOR Outage T2 (Kennedale), K723 (Kennedale), K722 (Kennedale), KAB2 (Kennedale) transformer T2 relay maintenance 4.42 Days
Continuous		  
20-Apr-26 07:00 26-Apr-26 17:00 EPCOR Outage T2 (Strathcona), S722 (Strathcona), S723 (Strathcona), SAB2 (Strathcona) transformer T2 doble and disconnect maintenance 6.42 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 23-Apr-26 17:00 ALTALINK TE 87s RTU/SCADA (87s Gaetz) SCADA RTU configuration update for CETO project 3.42 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 23-Apr-26 17:00 ALTALINK TE 275s RTU/SCADA (275s Jenner) update RTU configuration for 944L line protections 3.42 Days
Continuous		  
20-Apr-26 07:00 23-Apr-26 17:00 ALTALINK TE 132s RTU/SCADA (132s Ware Junction) update RTU configuration 944L line protection 3.42 Days
Continuous		  
20-Apr-26 07:00 23-Apr-26 17:00 ALTALINK TE 1080s RTU/SCADA (1080s Raptor) RTU configuration update for 944L protection 3.42 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		  
20-Apr-26 07:15 23-Apr-26 16:45 ALTALINK Outage 898L (37s North Calder - 92s Viscount), 37s 898 (37s North Calder), 92s 898 (92s Viscount) protection upgrade (37s898) 3.4 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 08:00 23-Apr-26 16:00 ATCO RB 7L60 (780s Lubicon - 827s Cranberry Lake) walk up and climbing inspection 3.33 Days
Continuous		  
20-Apr-26 08:00 23-Apr-26 16:00 ALTALINK TE 1080s Protection & Control (1080s Raptor) protection outages on 944AL A and B protection relays to test new SCN point for differential protection fail 3.33 Days
Continuous		  
20-Apr-26 08:00 23-Apr-26 16:00 ALTALINK TE 132s Protection & Control (132s Ware Junction) protection outage on 944L A and B line protection relays to test new differential protection fail SCN points 3.33 Days
Continuous		  
20-Apr-26 08:00 23-Apr-26 16:00 ALTALINK TE 275s Protection & Control (275s Jenner) 944L A and B line protection outages, testing of new differential protection fail SCN point 3.33 Days
Continuous		  
20-Apr-26 08:00 24-Apr-26 16:00 ENMAX Outage 8.1TR (SS-8) transformer power factor test, secondary cable test , transformer maintenance, relay fault pressure test, reversing switch check - 8.1-TC 4.33 Days
Continuous		  
20-Apr-26 08:00 23-Apr-26 16:00 ALTALINK TE 37s Protection & Control (37s North Calder) relay settings change 3.33 Days
Continuous		  
20-Apr-26 08:00 23-Apr-26 16:00 ALTALINK TE 92s Protection & Control (92s Viscount) relay settings change 3.33 Days
Continuous		  
20-Apr-26 08:00 23-Apr-26 16:00 ALTALINK TE 92s RTU/SCADA (92s Viscount) RTU database update 3.33 Days
Continuous		  
20-Apr-26 09:00 27-Apr-26 17:00 ATCO, PWLP TE 973s Protection & Control (973s Lanes Lake), 973s RTU/SCADA (973s Lanes Lake) 9LA93 protection updates and testing 7.33 Days
Continuous		  
20-Apr-26 09:00 27-Apr-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) 9L93 protection setting changes including updates at 973s and 615s 7.33 Days
Continuous		  
20-Apr-26 09:00 24-Apr-26 17:00 BCH Outage 5L98 (BCH Nicola - BCH Vaseux Lake) replace emergent broken insulators 4.33 Days
Continuous		 AB-BC
20-Apr-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 18.33 Days
Continuous		 AB-BC
20-Apr-26 09:00 23-Apr-26 17:00 BCH TE Protection & Control (BCH Natal) installing new cards in the NTLDCS002 SY DACS 3.33 Days
Continuous		 AB-BC
20-Apr-26 10:00 24-Apr-26 16:00 ATCO TE 951s RTU/SCADA (951s Thickwood Hills) configuration changes, computer patching 4.25 Days
Continuous		  
20-Apr-26 11:00 23-Apr-26 15:00 ATCO Outage 6L02 (765s Mannix Mine - 873s Marion Lake) climbing inspection on 6L02 3.17 Days
Continuous		  
20-Apr-26 11:30 23-Apr-26 17:00 ALTALINK TE 379s Protection & Control (379s Shell Canada Waterton) DSP card replacement and firmware upgrades on GE relays 3.23 Days
Continuous		  
20-Apr-26 12:00 24-Apr-26 17:00 ATCO Outage 813s SVC (813s Little Smoky), 813s 719 (813s Little Smoky) SVC maintenance 4.21 Days
Continuous		  
20-Apr-26 14:31 23-Apr-26 17:00 ATCO Outage 951s 920C (951s Thickwood) 920C cap at 951s Thickwood unavailable, forced outage 3.1 Days
Continuous		  
21-Apr-26 08:00 23-Apr-26 08:00 ALTALINK Outage 244s C1 (244s Bowmanton) replace secondary control fuses in breaker control cabinet
2 Days
Continuous		  
21-Apr-26 08:00 23-Apr-26 08:00 ALTALINK Outage 244s C2 (244s Bowmanton) replace control fuses within breaker secondary cabinet

2 Days
Continuous		  
21-Apr-26 08:00 23-Apr-26 08:00 ALTALINK Outage 244s C3 (244s Bowmanton) replace secondary control fuses in breaker control cabinet

2 Days
Continuous		  
21-Apr-26 08:00 24-Apr-26 16:00 ALTALINK TE 618s Protection & Control (618s Riverbend) move relay to new city of Lethbridge communication system 3.33 Days
Continuous		  
21-Apr-26 08:00 24-Apr-26 17:00 Lethbridge TE 111s Protection & Control (111s Coalbanks), 674s Protection & Control (674s Bowron) protection outages on 111s and 674s 725LE 'A' & 'B' protections to transfer TPR (teleprotection) circuits from existing JMUX to new SEL ICON 3.38 Days
Continuous		  
21-Apr-26 08:00 23-Apr-26 14:00 ATCO RB 7L137 (768s Rowley - 770s Three Hills) climbing inspection on 7L137 2.25 Days
Continuous		  
21-Apr-26 08:00 24-Apr-26 17:00 SUNCOR Outage 635EDD-1001 635PT-1037 (635EDD-1001) transformer's second side equipment maintenance 3.38 Days
Continuous		  
21-Apr-26 08:30 23-Apr-26 16:00 ALTALINK TE 394s RTU/SCADA (394s Empress) replace T3 metering equipment 2.31 Days
Continuous		  
21-Apr-26 09:00 26-Apr-26 17:00 ATCO, CapitalPower, PWLP Outage 9L93 (972s Tinchebray - 9L93 tap), 9LA93 (973s Lanes Lake - 9L93 tap), 972s 904 (972s Tinchebray), 972s 905 (972s Tinchebray), 615s 52T1 (615s Halkirk), 973s 52-240 (973s Lanes Lake), 615s 9L93D2 (615s Halkirk), 972s 9L93D1 (972s Tinchebray), 973s 89-L1 (973s Lanes Lake) cutover and commission 9L93 protection 5.33 Days
Continuous		  
21-Apr-26 09:00 23-Apr-26 16:00 ALTALINK Outage 394s T3 (394s Empress), 394s 36 (394s Empress) 394sT3 CT7 replacement, cable repair 2.29 Days
Continuous		  
21-Apr-26 13:00 23-Apr-26 12:00 REDDEER Outage 217s T2 (217s North Red Deer) transformer protection relay replacement 1.96 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 03-May-26 18:00 ALTALINK IO 1182s 4 (1182s Berland River) complete commissioning on 1182s8 12.13 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 08:00 23-Apr-26 16:00 ENMAX Outage 40.2TR (SS-40) tap changer inspection, reversing switch check, tap changer oil filtration maintenance, oil sampling MT, TC 1.33 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		  
23-Apr-26 03:30 23-Apr-26 06:30 ALTALINK Outage 62s T2 (62s Brazeau Plant) maintenance 3 Hours
Continuous		  
23-Apr-26 07:00 23-Apr-26 19:00 ALTALINK Outage 404s T1 (404s Peace Butte) 404s T1 maintenance 12 Hours
Continuous		  
23-Apr-26 07:00 23-Apr-26 17:00 EPCOR TE RTU/SCADA (Rossdale) emergency RTU outage, repair label issue and re-commission 10 Hours
Continuous		  
23-Apr-26 07:30 23-Apr-26 12:30 ALTALINK Outage 87s 952 (87s Gaetz) demo 1652 and 2352 breaker fail trips from the 87s952 trip chain 5 Hours
Continuous		  
23-Apr-26 08:00 23-Apr-26 17:00 ALTALINK TE 331s RTU/SCADA (331s Ponoka), AltaLink Telecom Equipment firmware upgrade on MPLS node A, firewall upgrade
9 Hours
Continuous		  
23-Apr-26 08:00 23-Apr-26 16:00 ENMAX, ALTALINK Outage 5s C3 (5s East Calgary), 5s C4 (5s East Calgary) HV switch Maintenance 2-5S7E 8 Hours
Continuous		  
23-Apr-26 08:00 24-Apr-26 16:00 ENMAX Outage 16.63L (SS-16 - SS-36), 36.5TR (SS-36), 16B69-16.63 (SS-16), 36B69-16.63/36.5TR (SS-36) HV breaker maintenance 1.33 Days
Continuous		  
23-Apr-26 08:00 23-Apr-26 16:00 ENMAX, ALTALINK IO 5s C3 (5s East Calgary), 5s C4 (5s East Calgary) ENMAX HV switch maintenance 2-5S7E 8 Hours
Continuous		  
23-Apr-26 08:00 24-Apr-26 16:00 ENMAX Outage 3.82L (SS-3 - SS-8), 3.3TR (SS-3), 3MD138-3.3TR (SS-3), SW83 (SS-3) power factor test - 3PT138-Z31, 3.3TR MD needs adjustments 1.33 Days
Continuous		  
23-Apr-26 08:00 23-Apr-26 18:00 ATCO IO ATCO Telecom Equipment non redundant firewall replacement 10 Hours
Continuous		  
23-Apr-26 08:00 23-Apr-26 17:00 ATCO IO ATCO Telecom Equipment Vegreville_T(SCC)-Telecom- Vegreville tower upgrading dynamic load rating server 9 Hours
Continuous		  
23-Apr-26 08:01 23-Apr-26 16:00 ALTALINK Trans Test 244s C2 (244s Bowmanton) energize C2 to update SEL protective relay KSET value with real world data 7.98 Hours
Continuous		  
23-Apr-26 09:00 23-Apr-26 16:00 ATCO TE ATCO Telecom Equipment flashcard failure replacement, link facing Whitecourt
 7 Hours
Continuous		  
23-Apr-26 09:00 24-Apr-26 17:00 BCH Outage 5L98 (BCH Nicola - BCH Vaseux Lake) 5CB51 rebuild 1.33 Days
Continuous		 AB-BC
23-Apr-26 09:00 23-Apr-26 16:30 ATCO TE 832s RTU/SCADA (832s Blumenort) SCADA updates for EPSS alarm and control 7.5 Hours
Continuous		  
23-Apr-26 09:00 23-Apr-26 10:00 ATCO TE ATCO Telecom Equipment, 796s RTU/SCADA (796s Nipisi) Nipisi_T-Telecom - upgrading NIPISI sub SAR OS to V21, then V22 60 Mins
Continuous		  
23-Apr-26 09:30 23-Apr-26 16:00 ALTALINK Outage 54s T3 (54s Fort Saskatchewan) 25 kV breaker maintenance 6.5 Hours
Continuous		  
23-Apr-26 10:00 23-Apr-26 14:00 ATCO Outage 789s 705R (789s Keg River) PRC trip coil testing 4 Hours
Continuous		  
23-Apr-26 10:00 23-Apr-26 16:00 ATCO Outage 7L56 (725s Goose River - 813s Little Smoky) splicing bird cage conductor causing outage on 7L56 6 Hours
Continuous		  
23-Apr-26 12:00 23-Apr-26 17:00 ATCO TE 972s Protection & Control (972s Tinchebray) 9L93 relays require new PT connections to accommodate CETO upgrade 5 Hours
Continuous		  
23-Apr-26 12:30 23-Apr-26 17:30 ALTALINK Outage 87s 1052 (87s Gaetz) demo 1252 and 2352 breaker fail trips from the 87s1052 trip chain 5 Hours
Continuous		  
23-Apr-26 13:00 24-Apr-26 13:00 ATCO TE 832s RTU/SCADA (832s Blumenort) investigate 832S Blumenort SCADA configuration issues
 24 Hours
Continuous		  
23-Apr-26 14:01 24-Apr-26 16:00 ATCO Outage 789s 706C (789s Keg River) PRC trip coil testing 25.98 Hours
Continuous		  
24-Apr-26 07:00 24-Apr-26 17:00 ALTALINK, REDDEER Outage 464L (87s Gaetz - 209s Timberlands), 209s 464E (209s Timberlands) replace damaged/broken insulator for 1 structure 13 10 Hours
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 07:00 25-Apr-26 17:00 ALTALINK Outage 113L (20s Ghost - 33s Spray), 20s 113 (20s Ghost), 33s 113 (33s Spray) urgent outage to replace structure 113L154 1.42 Days
Continuous		  
24-Apr-26 07:30 24-Apr-26 16:30 ALTALINK RB 778L (87s Gaetz - 217s North Red Deer) working within close proximity on 464L 9 Hours
Continuous		  
24-Apr-26 07:30 25-Apr-26 16:30 ALTALINK RB 3L (245s Seebe - 3AL tap), 3AL (43s Jumping Pound Junction - 3L tap), 3L (272s Springbank - 3AL tap), 3L (42s Sarcee - 272s Springbank) 3L recloser block required for work on 113L154 1.38 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 24-Apr-26 17:00 ALTALINK TE AltaLink Telecom Equipment firmware upgrade on MPLS node A, firewall upgrade 9 Hours
Continuous		  
24-Apr-26 08:00 27-Apr-26 17:00 SUNCOR Outage 635EDD-1001 635PT-1036 (635EDD-1001) 635PT-1036 outage for transformer's second side equipment maintenance 3.38 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		  
25-Apr-26 08:00 26-Apr-26 18:00 ENMAX, ALTALINK Outage 20.82L (SS-20 - SS-21), 21.80L (42s Sarcee - SS-21), 21.4TR (SS-21), 21.1TR (SS-21), 21B69-21.4TR (SS-21), 21MD138-21.4TR (SS-21), 21B138-20.82 (SS-21), 21B138-21.80 (SS-21), 20B138-20.82 (SS-20) HV SW Maintenance, spring substation washing, corona on string bus insulator-on plate, Altalink required to remove AML VT4 60S100 fuses 1.42 Days
Continuous		  
25-Apr-26 08:00 26-Apr-26 18:00 ALTALINK, ENMAX Outage 42s 21 (42s Sarcee), 21.80L (42s Sarcee - SS-21) Enmax request for maintenance and washing 1.42 Days
Continuous		  
25-Apr-26 08:00 25-Apr-26 16:00 ENMAX TE RTU/SCADA (SS-25) 25 sub SDN / RTU upgrade - disconnecting / reconnecting cables, relabel DPAC inputs 8 Hours
Daily		  
25-Apr-26 08:00 25-Apr-26 16:00 ENMAX TE Protection & Control (SS-25), APS# 145 Shepard RAS - Mitigation of 138 kV Thermal Constraints on ENMAX System 25 sub RAS A and B protection scheme outage - 25 sub SDN / RTU upgrade 8 Hours
Daily		  
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 27-Apr-26 17:00 EPCOR Outage RW2401 (EP Riverview) Riverview: RW2401 (SF6) Breaker Maintenance 10 Hours
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 27-Apr-26 18:00 ALTALINK Outage 285s T2 (285s East Camrose), 285s 3202 (285s East Camrose), 285s 1152 (285s East Camrose), 285s 1252 (285s East Camrose), 285s 389 (285s East Camrose) terminator replacement at 2038L0U1 Y & 2038L0U2 X, VLF cables. 11 Hours
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 07:00 30-Apr-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 3.46 Days
Continuous		  
27-Apr-26 08:00 11-May-26 18:00 ALTALINK, ATCO Outage 87s T2 (87s Gaetz), 87s 240kV East Bus (87s Gaetz), 87s 1552 (87s Gaetz), 87s 1652 (87s Gaetz), 87s 1952 (87s Gaetz), 87s 1252 (87s Gaetz), 962L (87s Gaetz - 972s Tinchebray), 986L (87s Gaetz - 972s Tinchebray) Closing Open points 'A' & 'C' and commissioning 87s962 & 87s986 MODs 14.42 Days
Continuous		  
27-Apr-26 08:00 28-Apr-26 16:00 ALTALINK TE 15s Protection & Control (15s Fort Macleod) move relay to new city of Lethbridge communication system 1.33 Days
Continuous		  
27-Apr-26 08:00 27-Apr-26 17:00 Lethbridge TE 146s Protection & Control (146s Macdonald), 593s Protection & Control (593s Lakeview) protection outages on 593s and 146s 823L 'B' protection to transfer TPR (teleprotection) circuit from existing JMUX to new SEL ICON 9 Hours
Continuous		  
27-Apr-26 08:00 28-Apr-26 17:00 Lethbridge TE 674s Protection & Control (674s Bowron) protection outages on 674s 725LW 'A' & 'B' protections to transfer TPR (teleprotection) circuits from existing JMUX to new SEL ICON 1.38 Days
Continuous		  
27-Apr-26 08:00 27-Apr-26 16:00 ENMAX Outage 25B240-D139 (SS-25) hv breaker maintenance, SF6 gas sample 8 Hours
Continuous		  
27-Apr-26 08:00 27-Apr-26 16:00 ALTALINK TE 38s RTU/SCADA (38s East Edmonton) split the existing SCADA VLAN from 1 to 1 and 2
8 Hours
Continuous		  
27-Apr-26 08:00 01-May-26 14:00 ALTALINK Outage 37s 4 (37s North Calder), 37s 88 (37s North Calder), 37s 81 (37s North Calder), 37s 82 (37s North Calder), 37s T6 (37s North Calder) P&C upgrades (37s4, 37s88, 37s82, 37s81, T6, PT20, PT21) 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 EPCOR, ALTALINK Outage 557s CDDS13 (557s Castle Downs), 920L (37s North Calder - 557s Castle Downs) 920LW/Castledowns: Altalink working on 37s North Calder 4.25 Days
Continuous		  
27-Apr-26 08:00 27-Apr-26 16:00 ALTALINK, DOW TE 166s RTU/SCADA (166s Dow Chemical Fort Saskatchewan) SCADA VLAN split 8 Hours
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 29-Apr-26 16:00 ENMAX Outage 21.4TR (SS-21), 21B69-21.4TR (SS-21) transformer power factor test, transformer maintenance, relay fault pressure test, oil sampling 2.33 Days
Continuous		  
27-Apr-26 08:00 30-Apr-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 3.33 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 27-Apr-26 16:00 ENMAX TE Protection & Control (SS-21) 21sub 138kV Bus Differential Z31 Protection outage. Relays, Lockout Testing 21RLY138-21.Z31. Outage in conjunction with 21.4TR and 21B138-21.CAP outages. Back-up fault clearing time 26.5 cycles. 8 Hours
Daily		  
27-Apr-26 08:00 28-Apr-26 16:00 ENMAX TE RTU/SCADA (SS-31) SCADA RTU Test - RTU-31, SCADA Alarm Test - RTU-31 ANN 1.33 Days
Daily		  
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 09:00 01-May-26 18:00 ATCO, ALTALINK Outage 953L (574s Nilrem - 755s Cordel) switch and breaker maintenance 4.38 Days
Continuous		  
27-Apr-26 09:00 30-Apr-26 17:30 ALTALINK, EPCOR Outage 89s 352 (89s Ellerslie), 89s 452 (89s Ellerslie), 1057L (89s Ellerslie - 657s Summerside) 1057L/Summerside: CVT/Arrestor Doble, SUDS1/SUDS3/SUDS9 Disconnect Maintenance 3.35 Days
Continuous		  
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) trip coil test 4.33 Days
Continuous		  
27-Apr-26 09:30 30-Apr-26 17:00 ALTALINK, EPCOR Outage 1057L (89s Ellerslie - 657s Summerside), 657s SU2401 (657s Summerside), 657s SU2402 (657s Summerside) 1057L/Summerside: CVT/Arrestor Doble, SUDS1/SUDS3/SUDS9 Disconnect Maintenance 3.31 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) TCM Program. RTXP Test Switch Mitigation and Replacement: 87A/9L953, 21B/9L953, 50BF/906BF. In conjunction with 1-00513803 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) Horse River_S_Telecom/Algar_T-Telecom- EOL Radio Replacement. Impact to the following for the outage duration: 7L38 A & B, 9L89A&B
All other circuits will have redundant protection in place		 8.21 Days
Continuous		  
27-Apr-26 11:00 30-Apr-26 16:30 ALTALINK Outage 198s T2 (198s Blackfalds) PRC5 transformer maintenance and oil leaks repair 3.23 Days
Continuous		  
27-Apr-26 11:00 27-Apr-26 16:00 ALTALINK, TRANSALTA TE 179s RTU/SCADA (179s Gleichen) investigate IED trouble alarm and potentially replace LAN-ES1 5 Hours
Continuous		  
27-Apr-26 11:00 27-Apr-26 16:00 ALTALINK TE 310p Protection & Control (310p Sundance) ACC reported breaker would not close remotely. Techs to replace CX relay associated with 1852 breaker prot 5 Hours
Continuous		  
27-Apr-26 11:30 27-Apr-26 16:00 ALTALINK, CSCL Outage 385s 112 (385s Spring Coulee), 385s T3 (385s Spring Coulee), 385s 52-2 (385s Spring Coulee), 385s 589 (385s Spring Coulee), 385s 89-L2 (385s Spring Coulee) urgent bird nest removal on 385s112 4.5 Hours
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 @ Rycroft 730s 7 Days
Continuous		  
27-Apr-26 12:00 27-Apr-26 18:00 ENMAX, ALTALINK IO 36.81L (44s Bearspaw Plant - SS-36) PRC5 maintenance - AML outage - 44s36.81E, first trip 6 Hours
Continuous		  
27-Apr-26 13:00 27-Apr-26 17:00 ENMAX, ALTALINK Outage 36.81L (44s Bearspaw Plant - SS-36), 44s 36.81E (44s Bearspaw Plant) 44s36.81E PRC5 maintenance, first trip 4 Hours
Continuous		  
27-Apr-26 13:00 28-Apr-26 17:00 ALTALINK Outage 410s 952 (410s Josephburg) PRC5 breaker maintenance, tank heater replacement & first trip 28 Hours
Continuous		  
27-Apr-26 13:30 30-Apr-26 16:00 ALTALINK Outage 310p T36 (310p Sundance) T36 transformer maintenance 3.1 Days
Continuous		  
27-Apr-26 13:30 27-Apr-26 16:30 ALTALINK Outage 14s T1 (14s Devon) 25 kV bus maintenance 3 Hours
Continuous		  
28-Apr-26 07:00 29-Apr-26 17:00 EPCOR Outage T3 (Poundmaker) Poundmaker T3 conservator tank investigation 1.42 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 28-Apr-26 17:00 ALTALINK TE 133s RTU/SCADA (133s Stelco Edmonton), 38s RTU/SCADA (38s East Edmonton), AltaLink Telecom Equipment firmware upgrade on MPLS nodes A and B and C, firewall upgrade 9 Hours
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 28-Apr-26 16:00 ENMAX Outage 25B240-D142 (SS-25) breaker maintenance 8 Hours
Continuous		  
28-Apr-26 08:00 28-Apr-26 13:00 ENMAX, ALTALINK IO 50L (44s Bearspaw Plant - SS-21), 60s50 (SS-21) Altalink outage. 44s50X maintenance, PRC5 and first trip 5 Hours
Continuous		  
28-Apr-26 08:00 28-Apr-26 16:00 ALTALINK TE 62s Protection & Control (62s Brazeau Plant), APS# 25 Brazeau 62s Generation Tripping Scheme standard relay maintenance 8 Hours
Continuous		  
28-Apr-26 08:00 28-Apr-26 16:30 ALTALINK Outage 453L (305s Acheson - 367s Harry Smith), 305s 453 (305s Acheson), 367s 453 (367s Harry Smith) breaker maintenance 8.5 Hours
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), 32.2TR (SS-32), 32.1TR (SS-32), 26.81L (SS-26 - SS-32) HV SW Replacement. MD-32.2TR, 32SW84, 32SW85, 32SW86, 32SW87, 32SW88 24.23 Days
Continuous		  
28-Apr-26 09:00 28-Apr-26 16:00 ATCO TE ATCO Telecom Equipment radio firmware update 7 Hours
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		  
28-Apr-26 09:00 28-Apr-26 12:00 ENMAX, ALTALINK Outage 50L (44s Bearspaw Plant - SS-21), 44s 50X (44s Bearspaw Plant), 60s50 (SS-21) 44s50X maintenance, PRC5 and first trip 3 Hours
Continuous		  
28-Apr-26 10:00 28-Apr-26 14:00 ATCO TE 827s RTU/SCADA (827s Cranberry Lake), ATCO Telecom Equipment Lubicon Telecom replace existing battery chargers & distribution panel with new Eltek rectifier and distribution panel 4 Hours
Continuous		  
28-Apr-26 13:00 28-Apr-26 17:00 ALTALINK Outage 237s 152 (237s Foothills) 237s152 first trip, maintenance and PRC 5 checks 4 Hours
Continuous		  
29-Apr-26 07:00 29-Apr-26 18:00 ALTALINK Outage 38s 731E (38s East Edmonton), 420s 731 (420s Broadmoor), 731L (38s East Edmonton - 746L tap) Replace structure 731L17
Install dampers at structures 731L16 & 731L18		 11 Hours
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 29-Apr-26 17:00 ALTALINK TE 293s RTU/SCADA (293s Bernese) replace firewall 9 Hours
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) 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 08:00 29-Apr-26 16:00 ENMAX Outage 25B240-D138 (SS-25) HV Breaker Maintenance. SF6 Gas Sample 8 Hours
Continuous		  
29-Apr-26 08:00 29-Apr-26 16:30 ALTALINK Outage 14s 739N (14s Devon), 739L (14s Devon - 305s Acheson), 305s 739 (305s Acheson) 138kV breaker maintenance 8.5 Hours
Continuous		  
29-Apr-26 08:30 29-Apr-26 12:30 ALTALINK Outage 237s 252 (237s Foothills) 237s252 First Trip, PRC5 and maintenance. 4 Hours
Continuous		  
29-Apr-26 08:30 30-Apr-26 16:30 ENMAX, ALTALINK Outage 5s 752 (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 29-Apr-26 12:00 ATCO TE ATCO Telecom Equipment Saskatoon Mtn_T-Telecom/Flying Shot Lake_S-Telecom- RADIO DIGITAL AVIAT IRU 600 7GHZ PM. IMPACT TO THE FOLLOWING TRAFFIC DURING PM AND SOFTWARE UPGRADE: 7LA33 A&B, 7L33 A&B 3 Hours
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 09:00 29-Apr-26 17:00 BCH Outage 2L294 (BCH A. A. Lambert - BCH Nelway) replace severely cracked cross arm 8 Hours
Continuous		 AB-BC
29-Apr-26 12:30 29-Apr-26 16:30 ALTALINK Outage 237s 2352 (237s Foothills) 237s2352 First Trip, PRC5 checks Investigate trip coil 1. 4 Hours
Continuous		  
29-Apr-26 13:00 29-Apr-26 16:00 ATCO TE ATCO Telecom Equipment Saskatoon Mtn_T-Telecom/Goodfare_S-Telecom- RADIO DIGITAL MDR 8502 PM. Impact to the following During PM: 7L33 A&B BIG MOUNTAIN / FLYINGSHOT, 7LA33 A&B FLYINGSHOT / CANADIAN HYDRO 3 Hours
Continuous		  
29-Apr-26 17:00 19-May-26 07:00 ALTALINK Outage 320p 2089 (320p Keephills) Urgent customer work on G3 19.58 Days
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 14s 739E (14s Devon) 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 08:00 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 LowBES VPN firewalls 9 Hours
Continuous		  
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		  
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 Outage 37s Protection & Control (37s North Calder), 37s T6 (37s North Calder) P&C upgrades (37s4, 37s88, 37s81, T6, PT20) 6.08 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 14:00 07-May-26 16:00 ALTALINK, EPCOR RB 930L (37s North Calder - Poundmaker) reclose block for Altalink working on 37s North Calder 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		  

Prepared On:   2026-04-22   14:43:36

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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