Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2025-02-15

The table below contains the significant transmission outages submitted as tentative to the AESO.
These Outages have not yet necessarily been approved, but are listed for awareness and coordination purposes.
An Outage has been considered significant for this table if it meets any one (1) or more of the following criteria:
  1. it affects a transmission facility operating at two hundred and forty (240) kV or greater;
  2. it affects an intertie;
  3. it affects an element connecting facilities owned by two (2) or more different legal owners of transmission facilities;
  4. it affects an element that connects a generating unit or an aggregated generating facility to the interconnected electric system;
  5. it requires the ISO to issue a dispatch or directive for generation in order to facilitate the planned outage;
  6. it affects a cutplane limit;
  7. it limits or reduces the operability of a synchronous condenser, static VAr compensator, static compensator or other similar dynamic device; or
  8. it affects high voltage direct current facilities.
Note: Where a transmission outage requires generation curtailments, the adjustments to generation will typically happen in the hours before the scheduled transmission outage and in the hour after the element is returned to service.

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Owner From To Duration Element Scheduled Activity Affected Intertie
ATCO, ALTALINK 04-Oct-24 01:05 05-May-25 12:00 213.45 Days
Continuous
840s McNeill Station, 830L (562s Cypress - 840s McNeill Station), 840s 701T (840s McNeill Station), 840s 901T (840s McNeill Station), 840s 702C (840s McNeill Station), 840s 703C (840s McNeill Station) forced outage AB-SK
BHE Canada 05-Oct-24 00:00 30-Apr-25 17:00 207.71 Days
Continuous
120s C1 (120s Picture Butte) forced outage  
EPCOR 13-Jan-25 07:00 14-Mar-25 17:00 60.38 Days
Continuous
987s T2 (987s Clover Bar), 987s C2406 (987s Clover Bar), 987s C2410 (987s Clover Bar), 987s C2409 (987s Clover Bar), 987s CC721 (987s Clover Bar), 987s CDS45 (987s Cloverbar), 987s CDS31 (987s Clover Bar) Cloverbar TX2 and 1191L bay outage  
BCH 10-Feb-25 09:00 28-Feb-25 17:00 18.33 Days
Continuous
2CB1 (BCH Natal) NTL station rebuild AB-BC
BCH 10-Feb-25 09:00 14-Mar-25 17:00 32.29 Days
Continuous
T3 (BCH Natal) NTL Station Rebuild. T3 OOS for PN replacement AB-BC
ATCO 10-Feb-25 10:00 17-Feb-25 08:00 6.92 Days
Continuous
7L32 (811s Clairmont Lake - 862s South Bezanson) changing rotten X arms and rotten poles  
ENMAX, ALTALINK 11-Feb-25 09:00 21-Feb-25 17:00 10.33 Days
Continuous
1109L (SS-25 - SS-65), 240kV West Bus (SS-25), 25B240-D133 (SS-25), 25B240-D136 (SS-25), 25B240-D142 (SS-25), 25B240-D141 (SS-25), 25B240-D139 (SS-25), 65MD240-1109 (SS-65) 25s 240kV West Bus and 1109L outage required due to clearances while placing new cables onto strs (1109L STR1 and C25s).  
ENMAX, ALTALINK 11-Feb-25 09:00 21-Feb-25 17:00 10.33 Days
Continuous
240kV West Bus (SS-25), 1109L (SS-25 - SS-65) Altalink outage. 25s 240kV West Bus and 1109L outage required due to clearances while placing new cables onto strs (1109L STR1 and C25s). Enmax to install grounds at 25s.  
CUB, ALTALINK 12-Feb-25 09:00 18-Feb-25 09:00 6 Days
Daily
672s 902T (672s Fengate Co-Generation), 430s 689 (430s Ursus) AESO compliance testing  
ALTALINK 15-Feb-25 07:00 15-Feb-25 18:00 11 Hours
Daily
702L (137s Sedgewick - 757s Battle River), 137s 169X (137s Sedgewick) Replace structure 84.  
ATCO 15-Feb-25 07:00 15-Feb-25 18:00 11 Hours
Continuous
7L702 (137s Sedgewick - 757s Battle River) AltaLink Scope: Replace structure 84.
Isolate line for AltaLink
 
ENMAX, ALTALINK 16-Feb-25 08:00 16-Feb-25 16:00 8 Hours
Continuous
28.80L (42s Sarcee - SS-28), 28B138-28.80 (SS-28) Commission 28.1TR protection  
ALTALINK 17-Feb-25 07:30 17-Feb-25 17:30 10 Hours
Continuous
763L (28s West Brooks - 763AL tap) Urgent outage to remove bird's nest and install bird deterrents on Structure #75  
ALTALINK 17-Feb-25 10:00 20-Feb-25 15:30 3.23 Days
Continuous
225L (67s Stirling - 225AL tap), 225L (225s Magrath - 225AL tap), 225AL (313s Raymond Reservoir - 225L tap) I-313s Raymond Substation outage for maintenance testing  
ALTALINK 17-Feb-25 12:01 03-Mar-25 12:30 14.02 Days
Continuous
199L (347s AML Fox Creek - 741s ATC Fox Creek) Fox Creek Substation Upgrade project. Demo old cables, install and terminate new cables, cut over to new protection.  
ALTALINK, EPCOR 18-Feb-25 07:00 19-Feb-25 17:00 1.42 Days
Continuous
1044L (EP 805s Jasper - 816s Petrolia), 816s P2405 (816s Petrolia), 816s P2406 (816s Petrolia) Petrolia: 1044L Zone PDS10/PDS14/PDS15 Disconnect Maintenance  
SUNCOR 18-Feb-25 08:00 19-Feb-25 20:00 1.5 Days
Continuous
29EDD-34 29-952-113 (29EDD-34) (BP) Corey - 9000750394 29EDD34 29-952-113 PRC5 Checks - REG  
ATCO 18-Feb-25 08:00 03-Mar-25 12:00 13.17 Days
Continuous
9L10 (876s Brintnell - 939s Livock) Line to Ground Mitigation  
SUNCOR 19-Feb-25 08:00 20-Feb-25 20:00 1.5 Days
Continuous
29EDD-34 29-952-142 (29EDD-34) (BP) Corey - 9000750399 29EDD34 29-952-142 PRC5 Checks-REG  
EPCOR 20-Feb-25 07:00 20-Feb-25 17:00 10 Hours
Continuous
557s T2 (557s Castle Downs) Castledowns: TX2 Secondary Box Measurements w/Engineering  
EPCOR 20-Feb-25 07:00 20-Feb-25 17:00 10 Hours
Continuous
816s T1 (816s Petrolia) Petrolia: TX1 MV Switchgear Maintenance  
SUNCOR 20-Feb-25 08:00 21-Feb-25 20:00 1.5 Days
Continuous
29EDD-34 29-752-121 (29EDD-34) (BP) Corey - 9000750395 29EDD34 29-752-121 PRC5 Checks-REG  
ATCO, ALTALINK 20-Feb-25 10:00 20-Feb-25 12:00 2 Hours
Continuous
7L77 (395s North Holden - 709s Vegreville), 709s 704 (709s Vegreville) PRC-005 TRIP COIL TESTING BREAKER 704  
EPCOR 21-Feb-25 07:00 21-Feb-25 17:00 10 Hours
Continuous
816s T2 (816s Petrolia) Petrolia: TX2 MV Switchgear Maintenance  
SUNCOR 21-Feb-25 08:00 22-Feb-25 20:00 1.5 Days
Continuous
29EDD-34 29-952-131 (29EDD-34) (BP) Corey - 9000750396 29EDD34 29-952-131 PRC5 Checks-REG  
ALTALINK, TRANSALTA 22-Feb-25 07:00 22-Feb-25 16:00 9 Hours
Continuous
33s 138kV Bus (33s Spray), 33s T1 (33s Spray), 33s T2 (33s Spray) Replace 33s1 CT13 "C" Phase. Remove old TAU communication cable.  
ALTALINK, TRANSALTA 22-Feb-25 08:00 22-Feb-25 17:00 9 Hours
Daily
33s T2 (33s Spray) maintenance  
SUNCOR 22-Feb-25 08:00 23-Feb-25 20:00 1.5 Days
Continuous
29EDD-34 29-952-141 (29EDD-34) (BP) Corey - 9000750397 29EDD34 29-952-141 PRC5 Checks-REG  
ALTALINK, TRANSALTA 22-Feb-25 16:00 23-Feb-25 16:00 24 Hours
Daily
33s T1 (33s Spray), 33s 1 (33s Spray) Continuation - Replace CT13 "C" Phase. Continue outage to commission new CT.  
EPCOR 24-Feb-25 07:00 24-Feb-25 17:00 10 Hours
Continuous
PM2405 (Poundmaker) Poundmaker: PM2405 NAIT Student Substation Tour  
EPCOR 24-Feb-25 07:00 28-Feb-25 17:00 4.42 Days
Continuous
T1 (EP Riverview), RW2401 (EP Riverview), RW2405 (EP Riverview) Riverview: TX1 Zone Relay Maintenance and Temp Gauge Calibration  
ATCO 24-Feb-25 07:00 13-Mar-25 17:00 17.38 Days
Continuous
730s 701T (730s Rycroft) install new relays, new 2z panel, end to end testing.  
ENMAX 24-Feb-25 08:00 02-Mar-25 16:00 6.33 Days
Continuous
162.1TR (SS-162), 240kV North Bus (SS-162), 138kV North Bus (SS-162) HV SW Maint. 162SW110, 162SW96, 162SW81, 162SW131, 162SW141, MD13-162.1TR, MD240-162.1TR. Oil Sampling Bushing, MT, TC. Check reversing switch.  
ENMAX, ALTALINK 24-Feb-25 08:00 14-Mar-25 16:00 18.29 Days
Continuous
21.80L (42s Sarcee - SS-21) HV SW Replacement 21SW81, 21SW82, 21SW83, 21MD138-21.1TR, 21.4TR (SS-21)  
BCH 24-Feb-25 09:00 28-Feb-25 17:00 4.33 Days
Continuous
5L51 (BPA Custer - BCH Ingledow) ING 5CB3 Insp and doble AB-BC
ATCO 25-Feb-25 09:30 25-Feb-25 17:30 8 Hours
Continuous
946s 901 (946s Oakland) Trip coil testing.  
ATCO, SUNCOR 25-Feb-25 10:00 27-Feb-25 17:00 2.29 Days
Continuous
9L162 (29EDD-94 Voyageur - 951s Thickwood Hills) Weld new guy wire vangs and re-anchor structure 9L162/44.  
ALTALINK 25-Feb-25 12:30 25-Feb-25 18:00 5.5 Hours
Daily
245s 777X (245s Seebe), 777L (48s Pocaterra - 245s Seebe) Protection upgrade project on 81/138B protection at 245s Seebe.  
ATCO 26-Feb-25 09:30 26-Feb-25 17:30 8 Hours
Continuous
946s 904 (946s Oakland) Trip coil testing.  
ATCO 27-Feb-25 09:30 27-Feb-25 17:30 8 Hours
Continuous
946s 908 (946s Oakland) Trip coil testing.  
ATCO 27-Feb-25 12:00 27-Feb-25 16:00 4 Hours
Continuous
7L146 (700s Bonnyville - 970s Bourque), 700s 704 (700s Bonnyville) PRC-005 TRIP COIL TESTING  
ATCO, SUNCOR 28-Feb-25 10:00 02-Mar-25 17:00 2.29 Days
Continuous
9L193 (29EDD-94 Voyageur - 951s Thickwood Hills) Weld new guy wire vangs and re-anchor structure 9L193/44.  
EPCOR 03-Mar-25 07:00 07-Mar-25 17:00 4.42 Days
Continuous
816s P2401 (816s Petrolia) Petrolia: P2401 Gauge/Valve Repair  
EPCOR 03-Mar-25 07:00 07-Mar-25 17:00 4.42 Days
Continuous
1098L (EP 805s Jasper - Poundmaker), EP 805s J2401 (EP 805s Jasper), EP 805s J2407 (EP 805s Jasper), PMDS1 (Poundmaker), PMDS4 (Poundmaker) 1098L Zone: Relay Maintenance  
ENMAX 03-Mar-25 08:00 09-Mar-25 16:00 6.29 Days
Continuous
162.2TR (SS-162), 138kV South Bus (SS-162), 240kV South Bus (SS-162) HV SW Maint. 162SW88, 162SW89, 162SW105, 162SW136, 162SW146, MD138-162.2TR, MD240-162.2TR. Oil Sampling MT, TC. Check reversing switch. 162.2TR H1 GE tap sensor replacement MS 3000  
ATCO 03-Mar-25 09:30 03-Mar-25 17:30 8 Hours
Continuous
946s 902 (946s Oakland) Trip coil testing  
ATCO, ALTALINK 03-Mar-25 10:00 07-Mar-25 16:30 4.27 Days
Continuous
7L129 (526s Buffalo Creek - 7LA129 tap) Replace structures, cross arms and insulators on 7L129  
ATCO, ALTALINK 03-Mar-25 10:00 07-Mar-25 16:30 4.27 Days
Continuous
7L129 (526s Buffalo Creek - 7LA129 tap) Replace structures, cross arms and insulators on 7L129  
EPCOR 04-Mar-25 07:00 04-Mar-25 12:00 5 Hours
Continuous
657s T1 (657s Summerside) Summerside: TX1 Bushing Name Plate Pictures (morning)  
ALTALINK 04-Mar-25 07:00 05-Mar-25 18:00 1.46 Days
Continuous
892L (244s Bowmanton - 895s Suffield) Cutover, test LTO, CT circuits at 244s and 895s to new RAS209 relays. Trip test 895s892 from new ‘B’ Bus protection and Breaker Fail relay. New maintenance switch being installed for breaker 244s2952 and 244s3052.  
ALTALINK 04-Mar-25 07:30 04-Mar-25 18:30 11 Hours
Daily
283s C1 (283s Violet Grove), 283s T1 (283s Violet Grove), 283s 138kV Bus (283s Violet Grove), 836L (61s Lodgepole - 283s Violet Grove), 673L (131s Moon Lake - 283s Violet Grove) Replace one leaking capacitor on C1. Maintenance on 283s30. Energize cap bank for 30 min. to take load readings at the end of the outage.  
ENMAX, ALTALINK 04-Mar-25 08:00 14-Mar-25 16:00 10.29 Days
Continuous
20.82L (SS-20 - SS-21), 21.80L (42s Sarcee - SS-21), 21.1TR (SS-21) HV SW Replacement 21SW81, 21SW82, 21SW83, 21MD138-21.1TR, 21.4TR (SS-21)  
BCH, ALTALINK 04-Mar-25 09:00 04-Mar-25 17:00 8 Hours
Continuous
1L275 (799s Coleman - BCH Natal), 1CB2 (BCH Natal) NTL 1CB2 Ras testing AB-BC
ATCO 04-Mar-25 09:30 04-Mar-25 17:30 8 Hours
Continuous
946s 903 (946s Oakland) Trip coil testing  
EPCOR 04-Mar-25 12:00 04-Mar-25 17:00 5 Hours
Continuous
657s T2 (657s Summerside) Summerside: TX2 Bushing Name Plate Pictures (afternoon)  
ALTALINK, BCH 05-Mar-25 09:00 05-Mar-25 17:00 8 Hours
Continuous
1L274 (BCH Natal - BCH Line Creek tap), 1CB1 (BCH Natal) NTL 1CB1 Ras testing AB-BC
ATCO 05-Mar-25 09:30 05-Mar-25 17:30 8 Hours
Continuous
946s 905 (946s Oakland) Trip coil testing  
ALTALINK 06-Mar-25 07:00 06-Mar-25 18:00 11 Hours
Daily
100L (498s Tilley - 895s Suffield) Remove old 96 CT circuits. Add 138kV Bus protection CT circuit.  
ALTALINK 06-Mar-25 07:00 15-Mar-25 18:00 9.42 Days
Continuous
199L (347s AML Fox Creek - 199AL tap) Fortis under build salvage and spar arm offset brace installation for their customer. P&C to disable trips to keep IPP @ 259s online.  
ATCO 06-Mar-25 09:30 06-Mar-25 17:30 8 Hours
Continuous
946s 909 (946s Oakland) Trip coil testing  
ENMAX, ALTALINK 09-Mar-25 08:00 12-Mar-25 14:00 3.25 Days
Continuous
7.82L (42s Sarcee - SS-7) Replace connection point on shield wire weld tabs on structure  
ENMAX, ALTALINK 10-Mar-25 08:00 11-Mar-25 16:00 1.33 Days
Continuous
932L (74s Janet - SS-162) HV SW Maint. 162SW145, 162SW144, MD-932L  
ENMAX, ALTALINK 10-Mar-25 08:00 11-Mar-25 16:00 1.33 Days
Continuous
932L (74s Janet - SS-162) HV SW Maint. 162SW145, 162SW144, MD-932L  
ATCO 10-Mar-25 08:00 13-Mar-25 17:00 3.38 Days
Continuous
7L28 (717s Ethel Lake - 846s Grand Centre) 7L28 Line to ground clearance mitigation  
SUNCOR 10-Mar-25 08:00 16-Mar-25 20:00 6.5 Days
Continuous
29EDD-1 Millennium 260kV West Bus 1, 29EDD-1 29EDD1s1052 (29EDD-1 Millennium) (BP) Corey - 300347749 29EDD1S1052 Densimeter Replacement; 450501635 - 29EDD1;W260B1 WEST BUS SYSTEM; 5Y/10Y (PRC5)  
BCH 10-Mar-25 09:00 11-Mar-25 17:00 1.33 Days
Continuous
5L52 (BPA Custer - BCH Ingledow) replace end-of-life insulators AB-BC
ALTALINK, EPCOR 10-Mar-25 09:00 14-Mar-25 17:30 4.35 Days
Continuous
930L (37s North Calder - Poundmaker) Epcor performing relay maintenance requiring line to be OOS.  
ATCO 10-Mar-25 10:00 17-Mar-25 16:00 7.25 Days
Continuous
7L32 (811s Clairmont Lake - 862s South Bezanson) Changing rotten X Arms and rotten poles from Test and Treat  
ALTALINK 11-Mar-25 08:00 11-Mar-25 16:00 8 Hours
Daily
336s 612 (336s Fincastle), 612L (336s Fincastle - 368s Burdett) Breaker outage to add CT circuit to new PMU  
ATCO 11-Mar-25 08:30 12-Mar-25 16:00 31.5 Hours
Continuous
786s SVC (786s High Level) SVC Spring Maintenance  
ALTALINK, EPCOR 11-Mar-25 09:00 12-Mar-25 17:00 1.33 Days
Continuous
510s 2952 (510s Sunnybrook), 510s 3052 (510s Sunnybrook), 1238L (330p Genesee - 510s Sunnybrook) Replace damaged corona ring on bus expansion joint.  
ATCO 11-Mar-25 10:00 17-Mar-25 17:00 6.29 Days
Continuous
9L40 (732s Mitsue - 809s Louise Creek) change out several Orange tagged/ damaged poles.  
ALTALINK 12-Mar-25 07:00 12-Mar-25 17:00 10 Hours
Daily
83s 138kV East Bus (83s Taber), 83s T3 (83s Taber), 83s 64 (83s Taber), 83s C1 (83s Taber), 83s 507 (83s Taber), 507L (83s Taber - 257s Hull), 83s 61 (83s Taber) Bus outage to trip test 83s507 (852), 83s61 (1152) and 83s64 (395) from new 83s610 (152) breaker fail protection.  
EPCOR 12-Mar-25 07:00 12-Mar-25 17:00 10 Hours
Continuous
987s T4 (987s Clover Bar), 987s C2408 (987s Clover Bar) Cloverbar: TX4 Tap Changer Maintenance  
EPCOR 13-Mar-25 07:00 14-Mar-25 17:00 1.42 Days
Continuous
987s T3 (987s Clover Bar), 987s C2407 (987s Clover Bar) Cloverbar: TX3 Tap Changer Maintenance and C2407 Counter Repair  
ALTALINK 13-Mar-25 07:00 18-Mar-25 14:00 5.29 Days
Continuous
944L (132s Ware Junction - 275s Jenner) Replace VT5 and CT (275s5)Like for like, install new JBs and cabling  
ENMAX, ALTALINK 15-Mar-25 08:00 24-Mar-25 16:00 9.33 Days
Continuous
50L (44s Bearspaw Plant - SS-21), 21.1C (SS-21), 21.2TR (SS-21) HV SW Replacement 21SW87, 21SW88, 21SW89, 21MD138-21.2TR  
ENMAX, ALTALINK 15-Mar-25 08:00 28-Mar-25 16:00 13.33 Days
Continuous
37.2TR (SS-37), 37.82L (74s Janet - SS-37) 37sub Capacity Upgrade. 138kv bus tie breaker placement and PT relocation. Temporary bus will be installed above the new bus tie breaker until completion of commissioning  
EPCOR 17-Mar-25 07:00 21-Mar-25 17:00 4.42 Days
Continuous
987s T2 (987s Clover Bar), 987s C2410 (987s Clover Bar), 987s C2406 (987s Clover Bar), 987s CC721 (987s Clover Bar) Cloverbar: TX2 VRR Cut Overs  
ALTALINK 17-Mar-25 07:00 28-Mar-25 18:00 11.46 Days
Continuous
610L (83s Taber - 336s Fincastle) VATD - Rebuild 610L. Cut over from Old 610L to New 610L. Replace 610L protections and add breaker fail protection.  
ENMAX, ALTALINK 17-Mar-25 08:00 27-Mar-25 16:00 10.33 Days
Continuous
50L (44s Bearspaw Plant - SS-21) HV SW Replacement 21SW87, 21SW88, 21SW89, 21MD138-21.2TR  
BCH 17-Mar-25 09:00 21-Mar-25 17:00 4.33 Days
Continuous
5L51 (BPA Custer - BCH Ingledow) ING 5CB3 Insp and doble AB-BC
ENMAX, ALTALINK 17-Mar-25 09:30 20-Mar-25 18:00 3.35 Days
Continuous
37.82L (74s Janet - SS-37) Replace 74s37.82 (1252) Breaker CT  
ALTALINK 18-Mar-25 08:00 19-Mar-25 17:00 1.38 Days
Continuous
913L (69s North Barrhead - 338s Cherhill), 913L (69s North Barrhead - 732s Mitsue), 69s T4 (69s North Barrhead) Replace failed relay at 69s A21/59/L2 and replace relay at 338s 913L A21/L1  
ATCO 18-Mar-25 08:00 19-Mar-25 17:00 1.38 Days
Continuous
9L913 (69s North Barrhead - 732s Mitsue) AltaLink Scope:

Replace failed relay at 69s A21/59/L2 and replace relay at 338s 913L A21/L1
 
ALTALINK 19-Mar-25 07:00 20-Mar-25 18:00 1.46 Days
Continuous
83s T1 (83s Taber), 83s 65 (83s Taber), 83s 610 (83s Taber), 610L (83s Taber - 336s Fincastle), 83s 172W (83s Taber), 172L (83s Taber - 172EL tap), 83s 67 (83s Taber), 83s C2 (83s Taber) Bus outage to trip test 83s172w, 83s67, 83s65, 83s610  
EPCOR, ALTALINK 24-Mar-25 07:00 27-Mar-25 17:00 3.42 Days
Continuous
EP 803s T3 (EP 803s Lambton), EP 803s L2403 (EP 803s Lambton), EP 803s L2405 (EP 803s Lambton), EP 803s L721 (EP 803s Lambton) Lambton: TX3 Zone Relay Maintenance and Rad Leak Repair  
EPCOR 24-Mar-25 07:00 07-Aug-25 17:00 136.42 Days
Continuous
987s T1 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CCP7214 (987s Clover Bar) Cloverbar: TX1 LCR  
ATCO 24-Mar-25 09:00 24-Mar-25 16:00 7 Hours
Continuous
715s 703 (715s Leming Lake), 7L66 (715s Leming Lake - 717s Ethel Lake) wire and test new breaker status to 21B/ 7L66 and new mirror bit signal to 717S RAS Hub  
ATCO 24-Mar-25 10:00 27-Mar-25 16:00 3.25 Days
Continuous
7L89 (700s Bonnyville - 721s La Corey), 700s 703 (700s Bonnyville) PRC-005 RELAY TESTING, RTXP TEST SWITCH REPLACEMENTS, PRC-005 TRIP COIL TESTING  
ATCO 24-Mar-25 10:00 31-Mar-25 16:00 7.25 Days
Continuous
7L32 (811s Clairmont Lake - 862s South Bezanson) Changing rotten X Arms and rotten poles from Test and Treat  
ENMAX, ALTALINK 24-Mar-25 11:30 25-Mar-25 17:00 29.5 Hours
Continuous
693L (42s Sarcee - SS-10) 693L U/G cables seal flooded vaults from water ingress.  
ENMAX, ALTALINK 24-Mar-25 11:30 25-Mar-25 17:00 29.5 Hours
Continuous
693L (42s Sarcee - SS-10) Altalink outage. 693L U/G cables seal flooded vaults from water ingress  
ALTALINK 24-Mar-25 12:30 27-Mar-25 17:30 3.21 Days
Continuous
310p 1552 (310p Sundance) First trip & 240kV breaker maintenance. Add oil to breaker.  
ALTALINK 25-Mar-25 07:30 25-Mar-25 17:30 10 Hours
Daily
74s 2452 (74s Janet) 74s2452 Install Double Washers on breaker mech. Punch Item.  
ENMAX, ALTALINK 25-Mar-25 08:00 25-Mar-25 16:00 8 Hours
Continuous
20.82L (SS-20 - SS-21), 21.80L (42s Sarcee - SS-21), 21.1TR (SS-21), 50L (44s Bearspaw Plant - SS-21), 21.1C (SS-21), 21.2TR (SS-21) HV SW Replacement 21SW86. Full substation outage  
ATCO 26-Mar-25 09:00 26-Mar-25 17:30 8.5 Hours
Continuous
2075s 905 (2075s Newell) - PRC-005 relay testing
- PRC-005 trip coil testing
Breaker 905 at 2075S
 
ALTALINK 26-Mar-25 11:00 27-Mar-25 17:30 30.5 Hours
Continuous
916L (5s East Calgary - 42s Sarcee) 916L U/G cables seal flooded vaults from water ingress.  
ALTALINK 26-Mar-25 23:00 27-Mar-25 03:00 4 Hours
Continuous
62s T1 (62s Brazeau Plant) maintenance  
ALTALINK 27-Mar-25 03:00 27-Mar-25 07:00 4 Hours
Daily
62s T2 (62s Brazeau Plant) maintenance  
ATCO 27-Mar-25 09:00 27-Mar-25 14:00 5 Hours
Continuous
846s 701 (846s Grand Centre), 7L28 (717s Ethel Lake - 846s Grand Centre) test new breaker 701 status to new SEL 2440 RAS relay and MB signal to 717 RAS hub  
ATCO 27-Mar-25 09:00 27-Mar-25 17:30 8.5 Hours
Continuous
2075s 911 (2075s Newell) PRC-005 relay testing
PRC-005 trip coil testing
On Breaker 911
 
ATCO 27-Mar-25 14:01 28-Mar-25 14:00 23.98 Hours
Continuous
846s 702 (846s Grand Centre), 7L24 (846s Grand Centre - 7LA24 tap) test new breaker 702 status to new SEL 2440 RAS relay and MB signal to 717S RAS hub  
ATCO 28-Mar-25 09:00 28-Mar-25 17:30 8.5 Hours
Continuous
2075s 920 (2075s Newell) PRC-005 relay testing
PRC-005 trip coil testing
On Breaker 920
 
ENMAX 29-Mar-25 09:00 06-May-25 14:00 38.21 Days
Continuous
240kV West Bus (SS-25) Altalink outage. Scaffold and Begin to Terminate new Cables at C25s. AltaLink to work under Enmax permit – Grounding required. Submit SRF.  
ATCO, SUNCOR 30-Mar-25 08:00 05-Apr-26 20:00 371.5 Days
Continuous
6L32 (29EDD-1 Millennium - 737s ATC Horseshoe) 29EDD1;29CVT-6 SYSTEM;5y,10y
 
ENMAX, ALTALINK 31-Mar-25 08:00 31-Mar-25 12:00 4 Hours
Continuous
28.80L (42s Sarcee - SS-28), 28.2TR (SS-28) Spring Substation Washing  
ATCO 31-Mar-25 09:00 09-Apr-25 17:00 9.33 Days
Continuous
7L701 (757s Battle River - 7LA701 tap), 757s 707 (757s Battle River) replace overhead shield wire with OPGW cable on 7L701 from structure 1 to 11  
ATCO 31-Mar-25 11:00 31-Mar-25 16:00 5 Hours
Continuous
977s 910R (977s Salt Creek), 977s 910 (977s Salt Creek) TRIP COIL TESTING  
ENMAX 01-Apr-25 08:00 01-Apr-25 12:00 4 Hours
Continuous
23.80L (74s Janet - SS-23), 23.4TR (SS-23) Spring Substation Washing  
SUNCOR 01-Apr-25 08:00 08-Apr-25 20:00 7.5 Days
Continuous
29EDD-34 29PT-341 (29EDD-34) BP (Corey) - 29EDD34;29PT-341 SYSTEM;PM 10y; 29EDD34;29PP-103 SYSTEM;PM 5y,10y
 
ATCO 01-Apr-25 09:00 01-Apr-25 12:00 3 Hours
Continuous
977s 901 (977s Salt Creek) TRIP COIL TESTING  
ATCO 01-Apr-25 11:00 04-Apr-25 16:00 3.21 Days
Continuous
930s SVC (930s Arcenciel) Spring Maintenance SVC  
ATCO 01-Apr-25 12:30 01-Apr-25 16:00 3.5 Hours
Continuous
977s 902 (977s Salt Creek) TRIP COIL TESTING  
ALTALINK 02-Apr-25 08:00 02-Apr-25 13:00 5 Hours
Daily
786L (799s Coleman - BCH Natal) Cut in breakers for future Open Point 'B' at Str122.  
ATCO 02-Apr-25 09:00 02-Apr-25 12:00 3 Hours
Continuous
977s 904 (977s Salt Creek) TRIP COIL TESTING  
ATCO 02-Apr-25 12:00 02-Apr-25 16:00 4 Hours
Continuous
7L24 (700s Bonnyville - 7LA24 tap), 700s 708 (700s Bonnyville) PRC-005 TRIP COIL TESTING  
ATCO 02-Apr-25 12:30 02-Apr-25 16:00 3.5 Hours
Continuous
977s 905 (977s Salt Creek) TRIP COIL TESTING  
ALTALINK 02-Apr-25 13:00 02-Apr-25 15:00 2 Hours
Continuous
786L (799s Coleman - BCH Natal) Close Open Point 'A' 170L to 786L creating bypass around 799s.  
ATCO 03-Apr-25 09:00 03-Apr-25 16:00 7 Hours
Continuous
977s 901T (977s Salt Creek) PRC-005 - SPR TESTING - TRANSFORMER 901T @ 977S
PRC-005 - TRIP COIL TESTING - BREAKER 701 @ 977S
 
ALTALINK 04-Apr-25 10:00 04-Apr-25 13:00 3 Hours
Daily
879L (244s Bowmanton - 879AL tap), 879L (368s Burdett - 879L tap) Open west jumper at Str 457A.  
ALTALINK 04-Apr-25 13:00 09-Apr-25 14:00 5.04 Days
Continuous
879L (368s Burdett - 879L tap) Replace structures 719-723.  
ENMAX, ALTALINK 05-Apr-25 08:00 06-Apr-25 16:00 1.33 Days
Continuous
771L (SS-47 - SS-162), 162B138-RB82 (SS-162), 47.1TR (SS-47), 47.2TR (SS-47), 162B138-RB81 (SS-162) HV SW Maint. 162SW85, 162SW84, MD-771L. SW85 at 162 center phase does not open past 90 deg-adjust. Summer washing 47sub SW81, SW86.  
EPCOR 07-Apr-25 07:00 08-Apr-25 17:00 1.42 Days
Continuous
665s T2 (665s Dome) Dome: TX2 Tap Changer Maintenance  
ENMAX 07-Apr-25 08:00 08-Apr-25 16:00 1.33 Days
Continuous
162B138-RB80 (SS-162), 162B138-RB81 (SS-162), 162.81L (391s Balzac - SS-162) HV SW Maint. 162SW82, 162SW83, MD-162.81L  
ALTALINK 07-Apr-25 08:00 08-Apr-25 16:30 1.35 Days
Continuous
391s 162.81 (391s Balzac) HV SW Maint. 162SW82, 162SW83, MD-162.81L.  
SUNCOR 07-Apr-25 08:00 13-Apr-25 20:00 6.5 Days
Continuous
29EDD-56 29PT-190 (29EDD-56) BP (Corey) - 29EDD-56;29PT-190 SYSTEM;PM 5y; 29EDD56;29PP-41H SYSTEM;PM 5Y/10Y  
ATCO 07-Apr-25 10:00 14-Apr-25 16:00 7.25 Days
Continuous
7L32 (811s Clairmont Lake - 862s South Bezanson) Changing rotten X Arms and rotten poles from Test and Treat  
ALTALINK 08-Apr-25 07:30 16-Apr-25 10:30 8.13 Days
Continuous
72s T1 (72s Leismer), 72s 2 (72s Leismer) oil reclaim and leak repairs  
BCH 08-Apr-25 09:00 11-Apr-25 17:00 3.33 Days
Continuous
5L76 (BCH Ashton Creek - BCH Nicola) Clearance required for heli and safety training purposes. AB-BC
ATCO 08-Apr-25 09:30 08-Apr-25 17:00 7.5 Hours
Continuous
934s 240kV Bus 900BS1 (934s Blackfly) REPAIR - 934S 900SST1 C Phase Gas Pressure near low
Top up Power PT gas levels
 
EPCOR 09-Apr-25 07:00 10-Apr-25 17:00 1.42 Days
Continuous
665s T1 (665s Dome) Dome: TX1 Tap Changer Maintenance  
SUNCOR 09-Apr-25 08:00 16-Apr-25 20:00 7.5 Days
Continuous
29EDD-34 29PT-340 (29EDD-34) BP (Corey) - 29EDD34;29PT-340 SYSTEM;PM 5y,10y; 29EDD34;29PP-102 SYSTEM;PM 5y,10y
 
ATCO 09-Apr-25 10:00 09-Apr-25 13:00 3 Hours
Continuous
934s 901 (934s Blackfly) 901 TRIP COIL TESTING  
ATCO 09-Apr-25 13:01 09-Apr-25 17:00 3.98 Hours
Continuous
934s 902 (934s Blackfly) 902 TRIP COIL TESTING  
ALTALINK 09-Apr-25 14:00 09-Apr-25 17:00 3 Hours
Daily
879L (244s Bowmanton - 879AL tap), 879L (368s Burdett - 879L tap) Close west jumper at Str 457A.  
ATCO 10-Apr-25 10:00 10-Apr-25 13:00 3 Hours
Continuous
934s 905 (934s Blackfly) TRIP COIL TESTING  
ATCO 10-Apr-25 13:01 10-Apr-25 17:00 3.98 Hours
Continuous
934s 906 (934s Blackfly) TRIP COIL TESTING  
ALTALINK 11-Apr-25 07:00 14-Apr-25 18:00 3.46 Days
Continuous
607L (135s Conrad - 607AL tap), 607L (336s Fincastle - 607AL tap), 135s T1 (135s Conrad), 135s T2 (135s Conrad) Reconductoring from Structures 2 -7 and replacing structures 5 & 6, for Hwy 3 widening.  
ALTALINK 11-Apr-25 08:00 11-Apr-25 16:00 8 Hours
Daily
336s 607 (336s Fincastle), 607L (336s Fincastle - 607AL tap), 607L (135s Conrad - 607AL tap), 135s T1 (135s Conrad), 135s T2 (135s Conrad) Breaker outage to add CT circuit to new PMU  
ATCO, ALBIAN 13-Apr-25 08:00 23-Apr-25 16:00 10.33 Days
Continuous
920s 901T (920s Jackpine) CNRL to repair 72kV Cables  
ATCO, ALBIAN 13-Apr-25 08:00 23-Apr-25 16:00 10.33 Days
Continuous
920s 901T (920s Jackpine), 919s 905 (919s Hartley), 920s 901 (920s Jackpine) Work to be done in coordination with CNRL outage.
919s - 905 Breaker Complete
920s - 901 Breaker Complete
920s - 901T Major Testing
 
SUNCOR 14-Apr-25 08:00 20-Apr-25 20:00 6.5 Days
Continuous
29EDD-56 29PT-191 (29EDD-56) BP (Corey) - 29EDD56;29PT-191 SYSTEM;PM 5Y/10Y;29EDD56;29PP-41C SYSTEM;PM 5y  
ALTALINK, EPCOR 14-Apr-25 09:30 17-Apr-25 17:00 3.31 Days
Continuous
930L (37s North Calder - Poundmaker), PM2403 (Poundmaker), PM2404 (Poundmaker) 930L Zone: Relay Maintenance  
ATCO 14-Apr-25 09:30 18-Apr-25 17:30 4.33 Days
Continuous
730s STATCOM (730s Rycroft), 730s 705 (730s Rycroft) SVC ANNUAL INSPECTION .  
ATCO 14-Apr-25 11:00 16-Apr-25 16:00 2.21 Days
Continuous
827s SVC (827s Cranberry Lake) 827s Spring SVC Maintenance  
ATCO 15-Apr-25 07:00 18-Apr-25 15:00 3.33 Days
Continuous
7L101 (790s Poplar Hill - 944s Lowe Lake) customer request  
ATCO 15-Apr-25 07:00 18-Apr-25 15:00 3.33 Days
Continuous
7L101 (790s Poplar Hill - 944s Lowe Lake), 790s 705 (790s Poplar Hill) PRC-005 - TRIP COIL TESTING  
ENMAX 17-Apr-25 08:00 25-Apr-25 16:00 8.33 Days
Continuous
65.1TR (SS-65) Tap Changer Inspection  
ENMAX 17-Apr-25 13:00 20-Apr-25 18:00 3.21 Days
Continuous
2GSU-XF-001 (SS-25) Power Factor Test - 25PT240-Z44, 25BUS240-25MCT2, 25 Sub Zone 44 PT Oil Leaks (North and South PT)  
ENMAX, ALTALINK 17-Apr-25 13:00 20-Apr-25 18:00 3.21 Days
Continuous
1003L (74s Janet - SS-25) Outage required to allow 2GSU 240kV bus isolation  
ATCO 21-Apr-25 08:00 24-Apr-25 17:00 3.38 Days
Continuous
7L86 (822s Wolf Lake - 1200s Foster Creek) Cenovus is expanding their 1200S substation 26m to the south, toward structure 449.
We will be relocating the conductor north of structure 449 to the new A-Frame structure that Cenovus is installing inside their substation.
 
EPCOR 22-Apr-25 07:00 27-Apr-25 17:00 5.42 Days
Continuous
805s T3 (805s Jasper), EP 805s J2404 (EP 805s Jasper), EP 805s J2405 (EP 805s Jasper) Jasper: TX3 Zone Relay Maintenance and J2404 Bay Doble and Tap Changer Maintenance and TX3 PRD Repair  
ATCO 22-Apr-25 09:00 23-Apr-25 17:30 1.35 Days
Continuous
2075s ACF22 (2075s Newell) FILTER BANK AC MAINTENANCE  
ATCO 22-Apr-25 09:30 22-Apr-25 12:00 2.5 Hours
Continuous
790s 702 (790s Poplar Hill), 7L22 (790s Poplar Hill - 7L88 tap) PRC-005 - TRIP COIL TESTING - BREAKER 702 @ 790S  
ATCO 22-Apr-25 10:00 28-Apr-25 16:00 6.25 Days
Continuous
7L32 (811s Clairmont Lake - 862s South Bezanson) Changing rotten X Arms and rotten poles from Test and Treat  
ATCO 22-Apr-25 13:30 22-Apr-25 16:00 2.5 Hours
Continuous
939s 912 (939s Livock) PRC-005 - TRIP COIL TESTING - BREAKER 912-NORTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 912-SOUTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 912-CENTER @ 939S
 
ATCO 23-Apr-25 09:30 23-Apr-25 11:30 2 Hours
Continuous
939s 901 (939s Livock) PRC-005 - TRIP COIL TESTING - BREAKER 901-NORTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 901-SOUTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 901-CENTER @ 939S
 
ATCO 23-Apr-25 11:31 23-Apr-25 14:00 2.48 Hours
Continuous
939s 903 (939s Livock) PRC-005 - TRIP COIL TESTING - BREAKER 903-NORTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 903-SOUTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 903-CENTER @ 939S
 
ATCO 23-Apr-25 14:01 23-Apr-25 16:30 2.48 Hours
Continuous
939s 904 (939s Livock) PRC-005 - TRIP COIL TESTING - BREAKER 904-NORTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 904-SOUTH @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 904-CENTER @ 939S
 
ATCO 24-Apr-25 09:00 24-Apr-25 17:30 8.5 Hours
Continuous
2075s ACF23 (2075s Newell) FILTER BANK AC MAINTENANCE  
ATCO 24-Apr-25 09:00 12-May-25 12:00 18.13 Days
Continuous
7L95 (715s Leming Lake - 889s Mahkeses), 7L66 (715s Leming Lake - 717s Ethel Lake), 715s 703 (715s Leming Lake), 715s 704 (715s Leming Lake) Replacing 700PT1 wood structure with new steel structure and 7L95 protection upgrade.  
ATCO 24-Apr-25 09:30 24-Apr-25 15:30 6 Hours
Continuous
939s 910 (939s Livock), 939s 911 (939s Livock), 939s 903T (939s Livock) PRC-005 - TRIP COIL TESTING - BREAKER 910 @ 939S
PRC-005 - TRIP COIL TESTING - BREAKER 911 @ 939S
Study Will indicate if we close 912 when available
 
ATCO, ALBIAN 24-Apr-25 10:00 02-May-25 12:00 8.08 Days
Continuous
920s 902T (920s Jackpine), 919s 907 (919s Hartley), 920s 902 (920s Jackpine) Work to be done in coordination with CNRL upon completion of their 920s outage on 901T
919s - 907 Breaker Complete
920s - 902 Breaker Complete
920s - 902T Major Testing
 
ALTALINK, ENMAX 25-Apr-25 08:00 28-Apr-25 16:00 3.33 Days
Continuous
42s 22 (42s Sarcee), 21.80L (42s Sarcee - SS-21) HV SW Replacement 21SW86. Full substation outage  
ENMAX, ALTALINK 25-Apr-25 08:00 28-Apr-25 16:00 3.33 Days
Continuous
50L (44s Bearspaw Plant - SS-21) HV SW Replacement 21SW86. Full substation outage  
ATCO 25-Apr-25 09:00 25-Apr-25 17:30 8.5 Hours
Continuous
2075s ACF24 (2075s Newell) FILTER BANK AC MAINTENANCE  
EPCOR 28-Apr-25 07:00 02-May-25 17:00 4.42 Days
Continuous
T4 (Poundmaker), PM2403 (Poundmaker), PM2402 (Poundmaker), PM721 (Poundmaker) Poundmaker: TX4 Zone Relay Maintenance  
BCH 28-Apr-25 09:00 30-Apr-25 17:00 2.33 Days
Continuous
5L52 (BPA Custer - BCH Ingledow), 5CB5 (BCH Ingledow), 5CB6 (BCH Ingledow) ING 5GD25, 5D25, 5CT25 and 5CVT5 INSPs AB-BC
ALTALINK, EPCOR 28-Apr-25 09:00 30-Apr-25 17:30 2.35 Days
Continuous
1056L (89s Ellerslie - 629s Argyll Transfer Station) 1056L Zone Doble and Bellamy BA2 Pothead Leak Repair. EPCOR work  
ATCO 28-Apr-25 09:00 02-May-25 17:30 4.35 Days
Continuous
2075s ACF21 (2075s Newell), 2075s 902T (2075s Newell), 2075S 930 (2075s Newell) SVC TRANSFORMER MAINTENANCE, ANNUAL SVC MAINTENANCE, FIRE SUPPRESSION INSPECTION AND RECERTIFICATION.  
BCH 28-Apr-25 09:00 09-May-25 17:00 11.33 Days
Continuous
T4 (BCH Natal) ING 5GD25, 5D25, 5CT25 and 5CVT5 INSPs AB-BC
ALTALINK, EPCOR 28-Apr-25 09:30 30-Apr-25 17:00 2.31 Days
Continuous
1056L (89s Ellerslie - 629s Argyll Transfer Station), 240BA2 (629s Argyll Transfer Station - 814s Bellamy), 814s B2401 (814s Bellamy), 814s B2402 (814s Bellamy) Argyll: 1056L Zone Doble and Bellamy BA2 Pothead Leak Repair  
ATCO 28-Apr-25 10:00 01-May-25 14:00 3.17 Days
Continuous
7L66 (715s Leming Lake - 717s Ethel Lake) GOI needed for climbing inspection and deficiency repairs on 7L66  
ALTALINK, EPCOR 30-Apr-25 07:00 02-May-25 17:00 2.42 Days
Continuous
1045L (EP 805s Jasper - 1045AL tap), EP 805s J2407 (EP 805s Jasper), EP 805s J2406 (EP 805s Jasper) 1045L: Insulator Repair  
ALTALINK, EPCOR 30-Apr-25 07:00 02-May-25 17:30 2.44 Days
Continuous
1045AL (320p Keephills - 1045L tap), 1045L (310p Sundance - 1045AL tap), 1045L (EP 805s Jasper - 1045AL tap) Epcor insulator repair  
ATCO 30-Apr-25 09:30 01-May-25 17:30 1.33 Days
Continuous
790s 704 (790s Poplar Hill), 790s 703T (790s Poplar Hill) PRC-005 - TRIP COIL TESTING - BREAKER 704 @ 790S
BREAKER SF6 HPL COMPLETE TESTING - 704 @ 790S
 
ATCO 30-Apr-25 09:30 01-May-25 17:30 1.33 Days
Continuous
892s 702 (892s Ribstone Creek), 7L696 (508s Lakesend - 892s Ribstone Creek) BREAKER SF6 GL312 COMPLETE TESTING - BREAKER 702 @ 892S  
ALTALINK, TRANSALTA 30-Apr-25 10:00 30-Apr-25 14:00 4 Hours
Daily
250p T1 (250p Bighorn Plant) maintenance  
BCH 01-May-25 09:00 03-May-25 17:00 2.33 Days
Continuous
5L51 (BPA Custer - BCH Ingledow) ING 5GD23, 5D23, 5CT23 and 5CVT3 INSPs AB-BC
ALTALINK, TRANSALTA 01-May-25 10:00 01-May-25 14:00 4 Hours
Daily
250p T2 (250p Bighorn Plant) maintenance  
ATCO, ALBIAN 02-May-25 08:00 13-May-25 08:00 11 Days
Continuous
919s 906 (919s Hartley) CNRL Request to isolate 906  
SUNCOR 03-May-25 09:00 15-May-25 16:00 12.29 Days
Continuous
29EDD-1 T2 (29EDD-1 Millennium) BP-29EDD-1 - TA - T2 OLTC Maintenance and Testing; 29EDD-1 T2 72LV Arrester replacement (CG)
300199837, 300203566
 
EPCOR 05-May-25 07:00 17-May-25 17:00 12.42 Days
Continuous
CV5 (EP 511s Victoria - 557s Castle Downs), 557s CDDS9 (557s Castle Downs), 557s CDDS12 (557s Castle Downs), EP 511s V2401 (EP 511s Victoria), EP 511s Victoria T5 (EP 511s Victoria), RV728 (Rossdale), EP 511s V727 (EP 511s Victoria) CV5: CV5 Zone Doble and Disconnect Maintenance and Victoria TX5 Doble and UGT Manhole Inspections  
ATCO 05-May-25 09:00 06-May-25 15:00 30 Hours
Continuous
755s 901 (755s Cordel) BREAKER 901 SF6 GL315 COMPLETE TESTING @ 755S Cordel  
BCH 05-May-25 09:00 20-May-25 17:00 15.33 Days
Continuous
2L112 (BPA Boundary - BCH Nelway) NLY 2SA2 2SA12 Replacement AB-BC
ATCO 05-May-25 10:00 08-May-25 16:00 3.25 Days
Continuous
7L89 (700s Bonnyville - 721s La Corey) GOI required for climbing inspection on 7L89 and for deficiency repair.  
ATCO, ALBIAN 05-May-25 12:00 07-May-25 16:00 2.17 Days
Continuous
919s 906 (919s Hartley) 906 Breaker Complete testing. To be done in coordination with CNRL outage on 901T.  
ALTALINK 05-May-25 13:00 08-May-25 17:00 3.17 Days
Continuous
320p T6 (320p Keephills) T6 outage to install new Camlin Bushing Monitors  
ATCO, FMGW 06-May-25 08:30 08-May-25 18:00 2.4 Days
Continuous
1024s PT-6001 (1024s Granlea), 1024s PT-6002 (1024s Granlea), 1024s 952-600001 (1024s Granlea), 1024s PS-6005 (1024s Granlea), 1024s PS-6006 (1024s Granlea), 1024s PS-6007 (1024s Granlea), 1024s PS-6008 (1024s Granlea) preform transformer leak repairs and inspections. 34kv bus bird proofing install.  
ENMAX, ALTALINK 06-May-25 14:00 12-May-25 14:00 6 Days
Continuous
1109L (SS-25 - SS-65) Scaffold and begin to Terminate new Cables on 1109L str 1.  
ENMAX, ALTALINK 06-May-25 14:00 12-May-25 14:00 6 Days
Continuous
240kV West Bus (SS-25), 1109L (SS-25 - SS-65) Altalink outage. 25s Scaffold and begin to Terminate new Cables on 1109L. Expanding zone to include 1109L, Enmax grounds to stay on.  
ATCO 07-May-25 09:00 08-May-25 15:00 30 Hours
Continuous
755s 902 (755s Cordel) BREAKER 902 SF6 GL315 COMPLETE TESTING @ 755S Cordel  
EPCOR 12-May-25 07:00 17-May-25 17:00 5.42 Days
Continuous
805s T4 (805s Jasper), EP 805s J2405 (EP 805s Jasper), EP 805s J2406 (EP 805s Jasper) Jasper: TX4 Zone Relay Maintenance and JDS10 Repair (045351) and TX4 Tap Changer Maintenance  
ATCO 12-May-25 10:00 15-May-25 16:00 3.25 Days
Continuous
7L89 (700s Bonnyville - 721s La Corey) GOI required for climbing inspection on 7L89 and for deficiency repair.  
ATCO 12-May-25 12:01 27-May-25 17:00 15.21 Days
Continuous
7L95 (715s Leming Lake - 889s Mahkeses), 715s 704 (715s Leming Lake) 7L95 protection upgrade.  
ENMAX, ALTALINK 12-May-25 14:00 31-May-25 14:00 19 Days
Continuous
1109L (SS-25 - SS-65) Complete Termination of new Cables on 1109L str 1.  
ENMAX, ALTALINK 12-May-25 14:00 31-May-25 14:00 19 Days
Continuous
1109L (SS-25 - SS-65) Altalink outage. Complete Termination of new Cables on 1109L str 1.  
ATCO, ALBIAN 14-May-25 08:00 15-May-25 08:00 24 Hours
Continuous
919s 908 (919s Hartley) CNRL Request
COG to open 908 breaker and 902TD in the Hartley 919S substation at CNRL Albian Sands. This will be an isolation point for our upcoming outage to permit work on supply side breakers/relays on our TP-2.
 
BCH 14-May-25 09:00 14-May-25 17:00 8 Hours
Continuous
2L112 (BPA Boundary - BCH Nelway) Maintenance on NLY T2 Non-electrical PM, 2CB7 and 2CB8 BFPN AB-BC
ALTALINK 14-May-25 23:00 15-May-25 03:00 4 Hours
Continuous
62s T1 (62s Brazeau Plant) maintenance  
ALTALINK 15-May-25 03:00 15-May-25 07:00 4 Hours
Daily
62s T2 (62s Brazeau Plant) maintenance  
SUNCOR 18-May-25 07:00 21-May-25 17:00 3.42 Days
Continuous
635EDD-1000 144kV Bus 635PP-1000 (635EDD-1000), 635EDD-1000 635PT-1000 (635EDD-1000), 635EDD-1000 635PS-1002 (635EDD-1000), 635EDD-1000 635PS-1004 (635EDD-1000), 635EDD-1000 635PS-1010 (635EDD-1000), 635EDD-1000 635PS-1022 (635EDD-1000), 635EDD-1000 635PS-1026 (635EDD-1000), 635EDD-1000 635PS-1030 (635EDD-1000), 635EDD-1000 635PS-1016 (635EDD-1000), 635EDD-1000 635-752-635PT-1000 (635EDD-1000) 635PP-1000 bus maintenance  
EPCOR 20-May-25 07:00 24-May-25 17:00 4.42 Days
Continuous
1139L (367s Harry Smith - EP Riverview), RW2403 (EP Riverview), RW2405 (EP Riverview) Riverview: 1139L Zone Doble and RWDS6/RWDS9/RWDS12 Disconnect Maintenance and Relay Maintenance  
ALTALINK 20-May-25 07:00 24-May-25 17:00 4.42 Days
Continuous
367s 1139 (367s Harry Smith) Riverview: 1139L Zone Doble and RWDS6/RWDS9/RWDS12 Disconnect Maintenance and Relay Maintenance  
EPCOR 20-May-25 07:00 30-May-25 17:00 10.42 Days
Continuous
657s T1 (657s Summerside) Summerside: TX1 DGA LCR  
BCH 20-May-25 09:00 30-May-25 17:00 10.33 Days
Continuous
T3 (BCH Natal) NTL Station Upgrade Project. Reconfigure NTL T3 bus connection and cut over to new station equipment AB-BC
ATCO 20-May-25 10:00 22-May-25 16:00 2.25 Days
Continuous
7L89 (721s La Corey - 826s Marguerite Lake) GOI required for climbing inspection on 7L89 and for deficiency repair.  
ATCO 20-May-25 11:00 29-May-25 17:00 9.25 Days
Continuous
7L199 (347s AML Fox Creek - 741s ATC Fox Creek), 741s 702 (741s ATC Fox Creek) Fox Creek Substation Upgrade project. Demo old cables, install and terminate new cables, cut over to new protection.
 
ATCO, CNRL 21-May-25 09:00 21-May-25 12:30 3.5 Hours
Continuous
847s 902 (847s Muskeg River) PRC-005 - TRIP COIL TESTING  
ATCO, CNRL 21-May-25 13:00 21-May-25 17:00 4 Hours
Continuous
847s 903 (847s Muskeg River) PRC-005 - TRIP COIL TESTING  
ATCO, CNRL 22-May-25 09:00 22-May-25 12:30 3.5 Hours
Continuous
847s 904 (847s Muskeg River) PRC-005 - TRIP COIL TESTING  
ATCO, CNRL 22-May-25 13:00 22-May-25 17:00 4 Hours
Continuous
847s 901 (847s Muskeg River) PRC-005 - TRIP COIL TESTING  
SUNCOR 25-May-25 07:00 28-May-25 17:00 3.42 Days
Continuous
635EDD-1000 144kV Bus 635PP-1001 (635EDD-1000), 635EDD-1000 635PT-1001 (635EDD-1000), 635EDD-1000 635-752-635PT-1001 (635EDD-1000), 635EDD-1000 635PS-1003 (635EDD-1000), 635EDD-1000 635PS-1009 (635EDD-1000), 635EDD-1000 635PS-1015 (635EDD-1000), 635EDD-1000 635PS-1021 (635EDD-1000), 635EDD-1000 635PS-1025 (635EDD-1000), 635EDD-1000 635PS-1029 (635EDD-1000), 635EDD-1000 635PS-1035 (635EDD-1000) 635PP-1001 bus maintenance  
EPCOR 26-May-25 07:00 06-Jun-25 17:00 11.42 Days
Continuous
805s T1 (805s Jasper), 72JM18 (EP 805s Jasper - Meadowlark), 72JW19 (EP 805s Jasper - Woodcroft), EP 805s J724 (EP 805s Jasper), EP 805s J722 (EP 805s Jasper), EP 805s J2401 (EP 805s Jasper) Jasper: TX1 Zone, JM18 Zone, Doble and JDS15/JDS21/JAB5/JDS3/JDS2/JDS29/JDS16/MDS1 Disconnect Maintenance, and TX1, J2403, J2408 Relay Maintenance  
ATCO 26-May-25 10:00 29-May-25 16:00 3.25 Days
Continuous
7L91 (715s Leming Lake - 826s Marguerite Lake) GOI required for climbing inspection on 7L91 and for deficiency repair.  
ATCO 27-May-25 08:00 03-Jun-25 17:00 7.38 Days
Continuous
7L224 (650s Hansman Lake - 774s Monitor) Install interphase spacers on 7L224  
ALTALINK, TRANSALTA 27-May-25 23:00 29-May-25 07:00 1.33 Days
Continuous
250p T1 (250p Bighorn Plant) maintenance  
ALTALINK, TRANSALTA 28-May-25 07:00 29-May-25 07:00 24 Hours
Continuous
250p T2 (250p Bighorn Plant) maintenance  
ATCO 28-May-25 09:00 29-May-25 14:00 29 Hours
Continuous
717s 702 (717s Ethel Lake), 7L66 (715s Leming Lake - 717s Ethel Lake) breaker maintenance  
ATCO 29-May-25 14:01 29-May-25 16:00 119 Mins
Continuous
717s 701 (717s Ethel Lake), 7L28 (717s Ethel Lake - 846s Grand Centre) PRC-005 TRIP COIL TESTING  
ENMAX, ALTALINK 31-May-25 14:00 02-Jun-25 14:00 2 Days
Continuous
1109L (SS-25 - SS-65) Cable testing, close cable open points on 1109L and salvage Temp O/H 1109L  
ENMAX, ALTALINK 31-May-25 14:00 02-Jun-25 14:00 2 Days
Continuous
240kV West Bus (SS-25), 1109L (SS-25 - SS-65) Altalink outage. Cable testing, close cable open points on 1109L and salvage Temp O/H 1109L. Expanding zone to include 1109L C25s Bus. Enmax grounding required, and Enmax to close 1109L risers removed from bus to potthead.  
EPCOR 02-Jun-25 07:00 08-Jun-25 17:00 6.42 Days
Continuous
816s P2401 (816s Petrolia), 816s P2402 (816s Petrolia), 816s T1 (816s Petrolia) Petrolia: TX1 Zone Doble and Disconnect Maintenance  
ATCO, CNRL 02-Jun-25 08:00 08-Jun-25 17:00 6.38 Days
Continuous
859s 701TD (859s Primrose), 859s 701T (859s Primrose), 859s 52G (859s Primrose), 859s 701A (859s Primrose), 859s 701B (859s Primrose), 859s 704 (859s Primrose), 859s 704A (859s Primrose), 859s 701 (859s Primrose), 859s 704B (859s Primrose), 859s Protection & Control (859s Primrose), 859s RTU/SCADA (859s Primrose) Perform maintenance activities in 859S.  
ALTALINK, EPCOR 02-Jun-25 09:30 02-Jun-25 17:00 7.5 Hours
Daily
1057L (89s Ellerslie - 657s Summerside), 89s 452 (89s Ellerslie), 89s 352 (89s Ellerslie) Summerside: 1057L Zone Doble and SUDS1/SUDS3/SUDS9 Disconnect Maintenance  
ALTALINK, EPCOR 02-Jun-25 09:30 05-Jun-25 17:00 3.31 Days
Continuous
1057L (89s Ellerslie - 657s Summerside), 657s SU2402 (657s Summerside), 657s SU2401 (657s Summerside) Summerside: 1057L Zone Doble and SUDS1/SUDS3/SUDS9 Disconnect Maintenance  
ATCO 02-Jun-25 15:00 30-Jun-25 14:00 27.96 Days
Continuous
732s 902T (732s Mitsue) Protection upgrade. Remove old protection, cut over to new protection and cut over equipment status, control and alarms to new station controller.  
ALTALINK 03-Jun-25 07:00 05-Jun-25 18:00 2.46 Days
Daily
861L (71s Lamoureux - 258s Dow Hydrocarbons) Maintenance and component replacements on various structures between 4-55.  
ALTALINK, BCH 04-Jun-25 09:00 10-Jun-25 17:00 6.33 Days
Continuous
1L274 (BCH Natal - BCH Line Creek tap), T1 (BCH Natal), T2 (BCH Natal) NTL Station Upgrade Project. Extend 1L274 to new NTL section; isolate NTL T1 & T2 section
NTL T1, NTL T2 (permanent removal)
AB-BC
EPCOR 09-Jun-25 07:00 15-Jun-25 17:00 6.42 Days
Continuous
H726 (EP Hardisty), EP 803s L721 (EP 803s Lambton), S724 (Strathcona), S723 (Strathcona), EP 803s T3 (EP 803s Lambton) Lambton/Strathcona/Hardisty: LH8 Zone Doble and Relay Maintenance, LS24 Zone Doble, Strathcona TX3 Doble, LDS13/SDS10/SDS8/SDS9/SAB3/HDS13 Disconnect Maintenance  
EPCOR 09-Jun-25 07:00 20-Jun-25 17:00 11.42 Days
Continuous
657s T2 (657s Summerside) Summerside: TX2 DGA LCR  
BCH 09-Jun-25 09:00 13-Jun-25 17:00 4.33 Days
Continuous
5RXN5 (BCH Cranbrook) Purpose: Non Electrical testing AB-BC
ATCO 09-Jun-25 09:00 23-Jun-25 17:30 14.35 Days
Continuous
2029S BUILDING VALVE HALL, 2029s 1205 (2029s Heathfield), 2029s 1206 (2029s Heathfield) Annual EATL outage at 2075s & 2029s.

2029s & 2075s AC & DC O&M.

USE 2-70215 FOR 13L50 GOI
USE 2-70216 FOR 2029s GOI
USE 2-70217 FOR 2075s GOI
 
ATCO 09-Jun-25 09:00 23-Jun-25 17:30 14.35 Days
Continuous
2075S BUILDING VALVE HALL, 2075s 916 (2075s Newell), 2075s 917 (2075s Newell) Annual EATL outage at 2075s & 2029s.

2029s & 2075s AC & DC O&M.

USE 2-70215 FOR 13L50 GOI
USE 2-70216 FOR 2029s GOI
USE 2-70217 FOR 2075s GOI
 
ATCO 09-Jun-25 09:00 23-Jun-25 17:30 14.35 Days
Continuous
13L50 (DC LINK), 13L50 (2029s Heathfield - 2075s Newell) Annual EATL outage at 2075s & 2029s.

2029s & 2075s AC & DC O&M.

USE 2-70215 FOR 13L50 GOI
USE 2-70216 FOR 2029s GOI
USE 2-70217 FOR 2075s GOI
 
ATCO 09-Jun-25 12:00 13-Jun-25 16:00 4.17 Days
Continuous
826s 902T (826s Marguerite Lake) transformer major maintenance  
EPCOR 16-Jun-25 07:00 20-Jun-25 17:00 4.42 Days
Continuous
1164L (816s Petrolia - EP Riverview), RW2402 (EP Riverview), RW2401 (EP Riverview), 816s P2403 (816s Petrolia), 816s P2404 (816s Petrolia) Riverview: 1164L Zone Doble and Relay Maintenance  
ENMAX, ALTALINK 16-Jun-25 08:00 19-Jun-25 16:00 3.33 Days
Continuous
28.80L (42s Sarcee - SS-28) HV SW Replacement. 28SW80  
ENMAX, ALTALINK 16-Jun-25 08:00 19-Jun-25 16:00 3.33 Days
Continuous
28.80L (42s Sarcee - SS-28) HV SW Replacement 28SW80  
ATCO 23-Jun-25 12:00 04-Jul-25 16:00 11.17 Days
Continuous
826s 901T (826s Marguerite Lake) transformer major maintenance  
ALTALINK 25-Jun-25 07:00 25-Jun-25 16:00 9 Hours
Daily
413L (239s Castle River - 632s Russell) We need to complete maintenance on 239s138DS4 at Castle River and need to request an advice on 413L..  
ENMAX, ALTALINK 27-Jun-25 08:00 03-Jul-25 16:00 6.33 Days
Continuous
37.2TR (SS-37), 37.82L (74s Janet - SS-37) HV SW Replacement. 37SW84, 37SW85, 37SW86  
ENMAX, ALTALINK 27-Jun-25 08:00 03-Jul-25 16:00 6.33 Days
Continuous
50L (44s Bearspaw Plant - SS-21) HV SW Replacement. 37SW84, 37SW85, 37SW86  
EPCOR, ALTALINK 02-Jul-25 07:00 06-Jul-25 17:00 4.42 Days
Continuous
665s D2401 (665s Dome), 665s D2404 (665s Dome), 665s T3 (665s Dome), 665s D721 (665s Dome), 72DS26 (665s Dome - Strathcona), 909L (89s Ellerslie - 665s Dome), S721 (Strathcona) Dome: TX3/DS26/909L Zone Doble and DDS1/DDS12/DDS13/DDS17/SDS3 Disconnect Maintenance and D721/D2404 Breaker Maintenance  
ALTALINK, EPCOR 02-Jul-25 07:00 08-Jul-25 17:00 6.42 Days
Continuous
1055L (629s Argyll Transfer Station - 816s Petrolia), 816s P2402 (816s Petrolia), 816s P2403 (816s Petrolia) 1055L: Pole Refurbishment and Petrolia Zone Doble and PDS4/PDS5/PDS11 Disconnect Maintenance  
ALTALINK 02-Jul-25 23:00 03-Jul-25 03:00 4 Hours
Continuous
62s T1 (62s Brazeau Plant) maintenance  
ALTALINK 03-Jul-25 03:00 03-Jul-25 07:00 4 Hours
Daily
62s T2 (62s Brazeau Plant) maintenance  
BCH 03-Jul-25 09:00 03-Jul-25 17:00 8 Hours
Continuous
2L293 (BCH Nelway - BCH Selkirk) Purpose: F26 AOP- This is for Maintenance on SEL AB-BC
EPCOR 07-Jul-25 07:00 13-Jul-25 17:00 6.42 Days
Continuous
52s E2402 (52s East Industrial) East Industrial: TX2 Doble and Tap Changer Maintenance, E2402 Doble and Breaker Maintenance  
ATCO 07-Jul-25 09:00 09-Jul-25 12:00 2.13 Days
Continuous
826s 903 (826s Marguerite Lake) BREAKER MAINTENANCE  
ATCO 08-Jul-25 08:00 11-Jul-25 17:00 3.38 Days
Continuous
7L701 (757s Battle River - 7LA701 tap) Install interphase spacers  
ALTALINK, EPCOR 09-Jul-25 07:00 15-Jul-25 17:00 6.42 Days
Continuous
1056L (89s Ellerslie - 629s Argyll Transfer Station) 1056L: Pole Refurbishment  
ATCO 09-Jul-25 12:01 12-Jul-25 16:00 3.17 Days
Continuous
826s 904 (826s Marguerite Lake) BREAKER MAINTENANCE  
ATCO, ALTALINK 12-Jul-25 08:00 15-Jul-25 17:00 3.38 Days
Continuous
7L701D1 (7LA701 tap), 701L (223s Strome - 7LA701 tap) Install interphase spacers  
ATCO, ALTALINK 12-Jul-25 08:00 15-Jul-25 17:00 3.38 Days
Continuous
701L (223s Strome - 7LA701 tap) Install interphase spacers  
ATCO 14-Jul-25 09:00 16-Jul-25 12:00 2.13 Days
Continuous
826s 907 (826s Marguerite Lake) BREAKER MAINTENANCE  
ALTALINK, EPCOR 14-Jul-25 09:30 25-Jul-25 17:00 11.31 Days
Continuous
1058L (657s Summerside - EP 803s Lambton), EP 803s L2403 (EP 803s Lambton), EP 803s L2404 (EP 803s Lambton), 657s SU2402 (657s Summerside), 657s SU2403 (657s Summerside) Summerside/Lambton: 1058L Pole Refurbishment and 1058L Summerside Zone Doble and Disconnect Maintenance, L2403 SF6 Leak Repair  
ATCO 14-Jul-25 15:00 11-Aug-25 14:00 27.96 Days
Continuous
732s 901T (732s Mitsue), 732s 701 (732s Mitsue), 732s 702 (732s Mitsue), 732s 902 (732s Mitsue), 732s 903 (732s Mitsue) Protection upgrade. Remove old protection, cut over to new protection and cut over equipment status, control and alarms to new station controller.  
ALTALINK 15-Jul-25 08:30 15-Jul-25 16:30 8 Hours
Continuous
786L (799s Coleman - BCH Natal) Open "Open Point 'A' 170L to 786L removing bypass around 799s.  
ALTALINK 16-Jul-25 08:00 16-Jul-25 14:00 6 Hours
Continuous
786L (799s Coleman - BCH Natal) Remove breakers for Open Point 'B' at Str122.  
ATCO 16-Jul-25 12:01 18-Jul-25 16:00 2.17 Days
Continuous
826s 908 (826s Marguerite Lake) BREAKER MAINTENANCE  
ALTALINK, TRANSALTA 17-Jul-25 10:00 17-Jul-25 14:00 4 Hours
Daily
250p T1 (250p Bighorn Plant) maintenance  
ALTALINK, TRANSALTA 18-Jul-25 10:00 18-Jul-25 14:00 4 Hours
Daily
250p T2 (250p Bighorn Plant) maintenance  
EPCOR 21-Jul-25 07:00 27-Jul-25 17:00 6.42 Days
Continuous
RW2403 (EP Riverview), RW2402 (EP Riverview), T2 (EP Riverview) Riverview: TX2 Zone Doble and Disconnect Maintenance and Relay Maintenance  
ATCO 21-Jul-25 09:00 23-Jul-25 12:00 2.13 Days
Continuous
2029s ACF11 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ATCO 21-Jul-25 09:00 01-Aug-25 17:30 11.35 Days
Continuous
2075s ACF11 (2075s Newell), 2075s ACF12 (2075s Newell), 2075s ACF13 (2075s Newell), 2075s ACF14 (2075s Newell), 2075s 901T (2075s Newell) Leak Repairs 901T/SVC MAINTENANCE/FILTER BANK AC MAINTENANCE/ACF13 Resistor Lid Replacements


 
ATCO 22-Jul-25 07:00 23-Jul-25 18:00 1.46 Days
Continuous
7L65 (709s Vegreville - 7LA65 tap), 7L65 (710s Vermilion - 7LA65 tap), 7LA65 tap Repair/replace T-Tap switches
Station outage to 708S
 
ATCO 23-Jul-25 13:00 25-Jul-25 17:30 2.19 Days
Continuous
2029s ACF21 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ATCO 28-Jul-25 09:00 30-Jul-25 12:00 2.13 Days
Continuous
2029s ACF12 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ALTALINK, EPCOR 28-Jul-25 09:30 01-Aug-25 17:00 4.31 Days
Continuous
920L (71s Lamoureux - 557s Castle Downs), 557s CD2404 (557s Castle Downs), 557s CD2405 (557s Castle Downs) Castledowns: 920LE Zone Doble and Disconnect Maintenance  
ALTALINK, EPCOR 28-Jul-25 09:30 08-Aug-25 17:00 11.31 Days
Continuous
1059L (EP 803s Lambton - 1059AL tap), 1059L (38s East Edmonton - 1059AL tap), EP 803s L2404 (EP 803s Lambton), EP 803s L2401 (EP 803s Lambton) 1059L: Pole Refurbishment  
ATCO 30-Jul-25 13:00 01-Aug-25 17:30 2.19 Days
Continuous
2029s ACF22 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ATCO 05-Aug-25 08:00 07-Aug-25 16:30 2.35 Days
Continuous
7L702 (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ALTALINK 05-Aug-25 08:00 07-Aug-25 16:30 2.35 Days
Continuous
702L (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ATCO 05-Aug-25 09:00 06-Aug-25 17:30 1.35 Days
Continuous
2029s ACF13 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ATCO 06-Aug-25 09:00 06-Aug-25 16:00 7 Hours
Continuous
7L85 (803s ATC Bullpound - 7LA85 tap) L-G Clearance mitigation at span 382 between Badlands and 803S Bull pound.  
ATCO 07-Aug-25 09:00 08-Aug-25 17:30 1.35 Days
Continuous
2029s ACF23 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ALTALINK, EPCOR 11-Aug-25 07:00 17-Aug-25 17:00 6.42 Days
Continuous
657s SU2403 (657s Summerside), 657s SU2402 (657s Summerside), 657s T2 (657s Summerside) Summerside: TX2 Zone Doble and Disconnect Maintenance  
ATCO 11-Aug-25 09:00 13-Aug-25 12:00 2.13 Days
Continuous
825s 901 (825s Whitefish Lake) BREAKER MAINTENANCE  
ATCO 11-Aug-25 10:00 14-Aug-25 16:30 3.27 Days
Continuous
7L702 (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ALTALINK 11-Aug-25 10:00 14-Aug-25 16:30 3.27 Days
Continuous
702L (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ATCO 11-Aug-25 10:00 15-Aug-25 17:00 4.29 Days
Continuous
9L16 (755s Cordel - 972s Tinchebray) Install foundations for new 9L16 structures 73 and 74 in preparation of the future line bay re-termination into 972S Tinchebray expansion.  
ATCO 13-Aug-25 12:01 15-Aug-25 16:00 2.17 Days
Continuous
825s 902 (825s Whitefish Lake) BREAKER MAINTENANCE  
EPCOR 18-Aug-25 07:00 24-Aug-25 17:00 6.42 Days
Continuous
987s CC721 (987s Clover Bar), 987s T2 (987s Clover Bar) Cloverbar: TX2 Zone Doble and Leak Repair  
EPCOR, ALTALINK 18-Aug-25 07:00 24-Aug-25 17:00 6.42 Days
Continuous
657s SU2405 (657s Summerside), 657s SU2404 (657s Summerside), 657s T1 (657s Summerside) Summerside: TX1 Zone Doble and Disconnect Maintenance  
ATCO 18-Aug-25 09:00 20-Aug-25 12:00 2.13 Days
Continuous
825s 903 (825s Whitefish Lake) BREAKER MAINTENANCE  
ATCO 18-Aug-25 10:00 21-Aug-25 16:30 3.27 Days
Continuous
7L702 (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ALTALINK 18-Aug-25 10:00 21-Aug-25 16:30 3.27 Days
Continuous
702L (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ATCO 20-Aug-25 12:01 22-Aug-25 16:00 2.17 Days
Continuous
825s 904 (825s Whitefish Lake) BREAKER MAINTENANCE  
ALTALINK 20-Aug-25 23:00 21-Aug-25 03:00 4 Hours
Continuous
62s T1 (62s Brazeau Plant) maintenance  
ALTALINK 21-Aug-25 03:00 21-Aug-25 07:00 4 Hours
Daily
62s T2 (62s Brazeau Plant) maintenance  
EPCOR 23-Aug-25 07:00 29-Aug-25 17:00 6.42 Days
Continuous
665s T1 (665s Dome), 665s D2401 (665s Dome), 665s D2402 (665s Dome) Dome: TX1 Zone Doble and DDS2/DDS3/DAB1 Disconnect Maintenance and Relay Maintenance  
ATCO 25-Aug-25 09:00 27-Aug-25 16:00 2.29 Days
Continuous
825s 905 (825s Whitefish Lake) BREAKER MAINTENANCE  
ALTALINK, EPCOR 25-Aug-25 09:30 29-Aug-25 17:00 4.31 Days
Continuous
915L (38s East Edmonton - 987s Clover Bar), 987s C2403 (987s Clover Bar), 987s C2405 (987s Clover Bar) Cloverbar: 915L Zone Doble and CDS35/CDS36/CDS37 Disconnect Maintenance  
ATCO 25-Aug-25 15:00 08-Sep-25 14:00 13.96 Days
Continuous
9L40 (732s Mitsue - 809s Louise Creek), 732s 901 (732s Mitsue), 732s 902 (732s Mitsue) Protection upgrade. Remove old protection, cut over to new protection and cut over equipment status, control and alarms to new station controller.  
EPCOR 02-Sep-25 07:00 14-Sep-25 17:00 12.42 Days
Continuous
EP 803s T2 (EP 803s Lambton), EP 803s L2402 (EP 803s Lambton), EP 803s L2405 (EP 803s Lambton) Lambton: LAB2 LCR and TX2 Zone Doble and LDS4/LDS9 Disconnect and Tap Changer Maintenance  
ATCO 06-Sep-25 08:00 09-Sep-25 17:00 3.38 Days
Continuous
7L85 (804s Wintering Hills - 7LA85 tap) Install interphase spacers  
EPCOR 08-Sep-25 07:00 14-Sep-25 17:00 6.42 Days
Continuous
816s P2404 (816s Petrolia), 816s P2405 (816s Petrolia), 816s T2 (816s Petrolia) Petrolia: TX2 Zone Doble and Disconnect Maintenance  
ALTALINK, EPCOR 08-Sep-25 09:30 12-Sep-25 17:00 4.31 Days
Continuous
921L (71s Lamoureux - 987s Clover Bar), 987s C2404 (987s Clover Bar), 987s C2406 (987s Clover Bar) Cloverbar: 921L Zone Doble and CDS30/CDS32/CDS40 Disconnect Maintenance  
ATCO 08-Sep-25 15:00 22-Sep-25 14:00 13.96 Days
Continuous
9L913 (69s North Barrhead - 732s Mitsue), 732s 903 (732s Mitsue), 732s 904 (732s Mitsue) Protection upgrade. Remove old protection, cut over to new protection and cut over equipment status, control and alarms to new station controller.  
ATCO, ALTALINK 09-Sep-25 09:00 10-Sep-25 18:00 1.38 Days
Continuous
7L760D4 (7LA760 tap), 7L760D5 (7LA760 tap), 7L760 (7LA760 tap - 7LC760 tap), 760L (760AL tap - 7LA760 tap) Building Temp Bypass to replace switches 7L760D4, 7L760D5 and 7LA760D1.
Will Need COG from AltaLink at 163s1
 
ATCO 09-Sep-25 17:01 14-Sep-25 17:00 5 Days
Continuous
7L85 (803s ATC Bullpound - 7LA85 tap) Install interphase spacers  
ALTALINK, TRANSALTA 09-Sep-25 23:00 11-Sep-25 07:00 1.33 Days
Continuous
250p T2 (250p Bighorn Plant) maintenance  
ALTALINK, TRANSALTA 10-Sep-25 07:00 11-Sep-25 07:00 24 Hours
Continuous
250p T1 (250p Bighorn Plant) maintenance  
EPCOR 15-Sep-25 07:00 21-Sep-25 17:00 6.42 Days
Continuous
EP 803s L2401 (EP 803s Lambton), EP 803s L2402 (EP 803s Lambton), EP 803s T1 (EP 803s Lambton) Lambton: TX1 Zone Doble and LAB1/LDS2/LDS3 Disconnect Maintenance  
ATCO 15-Sep-25 08:00 16-Sep-25 17:00 1.38 Days
Continuous
7L85 (801s Anderson - ATC 803s Bullpound) Crossarm Replacements, install interphase spacers, clearance mitigation  
ALTALINK, EPCOR 15-Sep-25 09:30 21-Sep-25 17:00 6.31 Days
Continuous
909L (310p Sundance - 665s Dome), 665s D2402 (665s Dome), 665s D2403 (665s Dome), 665s T2 (665s Dome) Dome: 909LE/TX2 Doble and DDS4/DDS5/DAB2 Disconnect Maintenance and Relay Maintenance  
ALTALINK, TRANSALTA 16-Sep-25 07:00 16-Sep-25 18:00 11 Hours
Daily
514L (396s Pincher Creek - 514BL tap), 514L (513s Lundbreck - 514BL tap), 322s T1 (322s Cowley Ridge) South will be performing maintenance on STR 16, 76 & 170  
SUNCOR 17-Sep-25 00:00 23-Sep-25 00:00 6 Days
Continuous
29PL7-4 (29EDD-65 - 29EDD-71), 29EDD-65 29PS-0284 (29EDD-65 Edd65Sub), 29EDD-71 29PS-243 (29EDD-71 Edd71Sub), 29EDD-65 29PT-0257 (29EDD-65) FB-Maintenance, Repairs and Testing - PRC-5 Testing, 29PT-260, 29PL7-4, 29PT-241, 29PT-257, 29PS-243 (300415541, 31807283, 31773784, 300109525)  
ATCO, ALTALINK 21-Sep-25 08:00 23-Sep-25 17:00 2.38 Days
Continuous
760L (760AL tap - 7LA760 tap) Install interphase spacers  
ATCO 22-Sep-25 09:30 25-Sep-25 17:00 3.31 Days
Continuous
7L749 (899s Edgerton - 7LB749 tap) Interphase spacers
Cross arm changes
 
ATCO 22-Sep-25 15:00 06-Oct-25 14:00 13.96 Days
Continuous
9L56 (720s Wabasca - 732s Mitsue), 732s 906 (732s Mitsue), 732s 904 (732s Mitsue) Protection upgrade. Remove old protection, cut over to new protection and cut over equipment status, control and alarms to new station controller.  
ATCO 23-Sep-25 08:00 30-Sep-25 17:00 7.38 Days
Continuous
7L85 (801s Anderson - ATC 803s Bullpound) Crossarm Replacements, install interphase spacers, clearance mitigation  
ATCO, ALTALINK 29-Sep-25 08:30 03-Oct-25 17:30 4.38 Days
Continuous
7L77 (395s North Holden - 709s Vegreville) Install interphase spacers  
ATCO, ALTALINK 29-Sep-25 09:00 03-Oct-25 17:00 4.33 Days
Continuous
7L77 (395s North Holden - 709s Vegreville) Install interphase spacers  
ALTALINK 01-Oct-25 08:00 11-Nov-25 17:00 41.42 Days
Continuous
102s SVC (102s Langdon), 102s T4 (102s Langdon) the controls change AB-BC
ATCO 06-Oct-25 09:30 07-Oct-25 17:30 1.33 Days
Continuous
845s 703 (845s Big Mountain), 845s 710 (845s Big Mountain), 7L228 (845s Big Mountain - 7L20 tap) Replace Crank Mechanisms on 144 kV Switches at 845s Big Mountain - 703B
Replace Crank Mechanisms on 144 kV Switches at 845s Big Mountain - 704B
 
ATCO 07-Oct-25 08:00 14-Oct-25 17:00 7.38 Days
Continuous
7L85 (801s Anderson - ATC 803s Bullpound) Crossarm Replacements, install interphase spacers, clearance mitigation  
ALTALINK 08-Oct-25 23:00 09-Oct-25 03:00 4 Hours
Continuous
62s T1 (62s Brazeau Plant) maintenance  
ALTALINK 09-Oct-25 03:00 09-Oct-25 07:00 4 Hours
Daily
62s T2 (62s Brazeau Plant) maintenance  
ATCO 14-Oct-25 08:00 21-Oct-25 17:00 7.38 Days
Continuous
7L171 (802s Michichi Creek - 804s Wintering Hills) Install interphase spacers  
ALTALINK, TRANSALTA 29-Oct-25 10:00 29-Oct-25 14:00 4 Hours
Daily
250p T1 (250p Bighorn Plant) maintenance  
ALTALINK, TRANSALTA 30-Oct-25 10:00 30-Oct-25 14:00 4 Hours
Daily
250p T2 (250p Bighorn Plant) maintenance  
ATCO 03-Nov-25 12:00 09-Dec-25 17:00 36.21 Days
Continuous
9L99 (801s Anderson - 807s Sheerness) Replace Breaker 901 @ 807S Sheerness, complete line 21A, 21B/9L99 protection upgrade and Commissioning  
ALTALINK 26-Nov-25 23:00 27-Nov-25 03:00 4 Hours
Continuous
62s T1 (62s Brazeau Plant) maintenance  
ALTALINK 27-Nov-25 03:00 27-Nov-25 07:00 4 Hours
Daily
62s T2 (62s Brazeau Plant) maintenance  
ATCO 08-Dec-25 13:00 11-Dec-25 15:00 3.08 Days
Continuous
7L89 (721s La Corey - 826s Marguerite Lake) Line to ground clearance mitigation spans 202-203; 209-210; 216-217-218; 217-218; 221-222-223-224; 255-256; 313-314-315  
ATCO 15-Dec-25 13:00 18-Dec-25 15:00 3.08 Days
Continuous
7L89 (721s La Corey - 826s Marguerite Lake) Line to ground clearance mitigation spans 202-203; 209-210; 216-217-218; 217-218; 221-222-223-224; 255-256; 313-314-315  
ALTALINK, TRANSALTA 17-Dec-25 10:00 17-Dec-25 14:00 4 Hours
Daily
250p T1 (250p Bighorn Plant) maintenance  
ALTALINK, TRANSALTA 18-Dec-25 10:00 18-Dec-25 14:00 4 Hours
Daily
250p T2 (250p Bighorn Plant) maintenance  
SUNCOR 02-Mar-26 08:00 08-Mar-26 20:00 6.46 Days
Continuous
29PL9-16 (29EDD-1 Millennium - 29EDD-94 Voyageur) 29EDD1;29PT418/29PL9-16 SYSTEM;PM 5y,10y
 
SUNCOR 09-Mar-26 08:00 15-Mar-26 20:00 6.5 Days
Continuous
29PL9-17 (29EDD-1 Millennium - 29EDD-94 Voyageur) 29EDD1;29PT419/29PL9-17 SYSTEM;PM 5y,10y
 
ATCO, SUNCOR 16-Mar-26 08:00 22-Mar-26 20:00 6.5 Days
Continuous
29PL9-1 (29EDD-1 Millennium - 848s Ruth Lake) 29EDD1;29CVT-3 SYSTEM;PM 5y,10y
 
ATCO, SUNCOR 23-Mar-26 08:00 29-Mar-26 20:00 6.5 Days
Continuous
29PL9-2 (29EDD-1 Millennium - 848s Ruth Lake) BP (Corey) - 29EDD1;29CVT-1 SYSTEM;PM 5y,10y  
SUNCOR 06-Apr-26 08:00 12-Apr-26 20:00 6.5 Days
Continuous
29PL9-3 (29EDD-1 Millennium - 29EDD-3), 29EDD-3 29PT-6 (29EDD-3) 29EDD1;29CVT-4 SYSTEM;PM 5y,10y;
 
SUNCOR 13-Apr-26 08:00 19-Apr-26 20:00 6.5 Days
Continuous
29EDD-1 T1 (29EDD-1 Millennium), 29EDD-1 260kV South Bus 1 (29EDD-1 Millennium), 29EDD-1 72kV South Bus (29EDD-1 Millennium) 29EDD1;XFMR T1; X260B1; X72B1 SYSTEM;PM 5y  
ATCO 13-Apr-26 10:00 18-Apr-26 17:00 5.29 Days
Continuous
7L22 (790s Poplar Hill - 7L88 tap) Cut open 7L22, connect new line section to new 2061S Dobbs
7L22/21B relay upgrades at 790S Poplar Hill and 811S Clairmont Lake
On completion energize new 2061S Dobbs substation
 
SUNCOR 20-Apr-26 08:00 26-Apr-26 20:00 6.5 Days
Continuous
29EDD-1 T2 (29EDD-1 Millennium), 29EDD-1 260kV North Bus 2 (29EDD-1 Millennium), 29EDD-1 72kV North Bus (29EDD-1 Millennium) 29EDD1;XFMR T2; N260B2; N72B1 SYSTEM;PM 5y  
ATCO 03-May-26 10:00 04-May-26 17:00 31 Hours
Continuous
7L22 (811s Clairmont Lake - 7L88 tap) 7L22/21B relay upgrade at 811S Clairmont Lake
Upon completion new 2061S Dobbs substation ready to energize
 
SUNCOR 04-May-26 08:00 10-May-26 20:00 6.5 Days
Continuous
29PL6-6 (29EDD-1 Millennium - 29EDD-2 Tar Island), 29EDD-2 29PT-2 (29EDD-2 Tar Island) BP (Corey) - 29EDD2;29PP-1 SYSTEM;PM 5y  
ATCO 04-May-26 09:00 18-May-26 17:30 14.35 Days
Continuous
13L50 (2029s Heathfield - 2075s Newell) Kinbrook Addition to 2075s  
ATCO 04-May-26 09:00 18-May-26 17:30 14.35 Days
Continuous
2029s T11 (2029s Heathfield) Kinbrook Addition to 2075s Newell.  
ATCO 04-May-26 09:00 18-May-26 17:30 14.35 Days
Continuous
2075s T11 (2075s Newell) Kinbrook Addition to 2075s Newell.  
SUNCOR 18-May-26 08:00 24-May-26 20:00 6.5 Days
Continuous
29PL9-12 (29EDD-34 - 29EDD-65) BP (Corey) - 29EDD34;29PL9-12 SYSTEM;PM 5y,10y
 
ATCO 19-May-26 09:00 19-May-26 17:00 8 Hours
Continuous
9L16 (755s Cordel - 972s Tinchebray), 755s 904 (755s Cordel), 755s 905 (755s Cordel), 972s 903 (972s Tinchebray) Disconnect 9L16 from existing A-frame deadend and 9L16D2 (to be renamed 9L86D1)
Restore bus leave renamed 9L86D1 open for future line connection.
 
ATCO 19-May-26 09:00 29-May-26 17:00 10.33 Days
Continuous
9L16 (755s Cordel - 972s Tinchebray) Disconnect 9L16 from existing A-frame deadend and 9L16D2 (to be renamed 9L86D1)
Restore bus leave renamed 9L86D1 open for future line connection.
 
ATCO 08-Mar-27 10:00 17-Mar-27 17:00 9.25 Days
Continuous
9L24 (946s Oakland - 959s Lanfine), 959s 906 (959s Lanfine), 959s 905 (959s Lanfine), 946s 902 (946s Oakland), 946s 903 (946s Oakland) Replace A/B protection relays at 959S Lanfine and 946S Oakland
Cut in and reroute 9L24
Connect new 9LA24 T-tap
Commission Telecom and Protection to new 1072S Rose Lynn substation
 
ATCO 20-Jul-27 08:00 21-Jul-27 17:00 1.38 Days
Continuous
7L53 (706s Irish Creek - 7LA53 tap), 7LA53 (969s Lindbergh - 7L53 tap), 7L53 (700s Bonnyville - 7LA53 tap) Cold Lake Area Project to connect 1064s  
ATCO 22-Jul-27 08:00 25-Jul-27 17:00 3.38 Days
Continuous
7L91 (715s Leming Lake - 826s Marguerite Lake) Cold Lake Area Energy Centre Project
 

AB-BC, AB-SK & AB-MATL: refer to AESO web posting: http://itc.aeso.ca/itc/public/atc
Also,
AB-BC, AB-SK & AB-MATL: refer to ISO Rule 203.6: http://www.aeso.ca/rulesprocedures/18592.html

Prepared On: 2025-02-05   16:26:06


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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