Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2025-05-24

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
BHE Canada 05-Oct-24 00:00 30-Jun-25 17:00 268.71 Days
Continuous		 120s C1 (120s Picture Butte) forced outage  
ALTALINK 24-Jan-25 00:00 31-Dec-25 16:00 341.67 Days
Continuous		 74s C3 (74s Janet) forced outage  
EPCOR 31-Mar-25 07:00 07-Aug-25 17:00 129.42 Days
Continuous		 987s T1 (987s Clover Bar), 987s CCP7213 (987s Clover Bar), 987s CCP7214 (987s Clover Bar) Cloverbar - TX1 LCR  
SUNCOR 06-May-25 08:00 28-May-25 20:00 22.5 Days
Continuous		 29PL6-7 (30EDD-1 - 29EDD-5), 29PL6-4 (29EDD-1 Millennium - 30EDD-1), 30EDD-1 623T (30EDD-1), 30EDD-1 626T (30EDD-1), 30EDD-1 621T (30EDD-1), 30EDD-1 PSD-621-LOAD (30EDD-1), 30EDD-1 621 (30EDD-1), 30EDD-1 622 (30EDD-1), 30EDD-1 623 (30EDD-1), 30EDD-1 624 (30EDD-1), 30EDD-1 629 (30EDD-1), 30EDD-1 630 (30EDD-1), SPL6-7 (29EDD-5), 30EDD-1 622TD (30EDD-1), 30EDD-1 29PL6-4D1 (30EDD-1) 29PP-116 G/H/I/E/F Bus pm  
BCH 13-May-25 08:00 30-May-25 09:00 17.04 Days
Continuous		 T3 (BCH Natal) disconnect T3 AB-BC
SUNCOR 16-May-25 08:00 28-May-25 20:00 12.5 Days
Continuous		 29PL6-4 (29EDD-1 Millennium - 30EDD-1), 29PL6-7 (30EDD-1 - 29EDD-5), 30EDD-1 621T (30EDD-1), 30EDD-1 621 (30EDD-1), 30EDD-1 628 (30EDD-1), 30EDD-1 622 (30EDD-1), 30EDD-1 629 (30EDD-1), 30EDD-1 630 (30EDD-1), SPL6-7 (29EDD-5) 29PP-116 D/E/F/G 5 year PM  
ALTALINK, EPCOR 18-May-25 07:00 25-May-25 17:00 7.42 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  
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 BC maintenance does not affect the Alberta ATC AB-BC
ATCO 20-May-25 11:00 26-May-25 17:00 6.25 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.
  
ALTALINK 20-May-25 11:00 29-May-25 17:00 9.25 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.  
SUNCOR 21-May-25 09:00 29-May-25 20:00 8.46 Days
Continuous		 29EDD-1 T2 (29EDD-1 Millennium) OLTC maintenance and testing, 29EDD-1 T2 72LV arrester replacement  
EPCOR 23-May-25 07:00 24-May-25 17:00 1.42 Days
Continuous		 330p 1208 (330p Genesee) Genesee: 1208 bay yard lighting upgrade (Pole #9)  
ENMAX, ALTALINK 23-May-25 14:00 02-Jun-25 10:00 9.83 Days
Continuous		 1109L (SS-25 - SS-65), 25B240-D136 (SS-25), 25B240-D139 (SS-25), 25B240-D133 (SS-25), 25B240-D141 (SS-25), 25B240-D142 (SS-25), 25MD240-1109 (SS-25) 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. soak test June 2nd 10:00  
ENMAX, ALTALINK 25-May-25 08:00 31-May-25 16:00 6.33 Days
Continuous		 37.2TR (SS-37), 37.82L (74s Janet - SS-37) 37sub Capacity Upgrade. Accommodate the commissioning of the new relays (Z31/Z32 bus diff, ASW and BMR-BT5).  
ENMAX, ALTALINK 25-May-25 08:00 31-May-25 16:00 6.33 Days
Continuous		 37.82L (74s Janet - SS-37) 37sub Capacity Upgrade. Accommodate the commissioning of the new relays Z31/Z32 bus diff, ASW and BMR-BT5. Only one protection scheme remove at a time.  
EPCOR 26-May-25 02:00 26-May-25 16:00 14 Hours
Continuous		 987s CGB3 (987s Clover Bar), 987s GT3 (987s Clover Bar) metering upgrade  
ALTALINK 26-May-25 07:00 29-May-25 17:30 3.44 Days
Continuous		 122s T1 (122s Alberta Newsprint) T1 Doble, maintenance, oil leaks. T1 CT Repair  
ALTALINK 26-May-25 07:00 29-May-25 17:30 3.44 Days
Continuous		 122s T2 (122s Alberta Newsprint) T2 Doble, maintenance. T2 CT Repair  
ALTALINK, EPCOR 26-May-25 07:00 01-Jun-25 17:00 6.42 Days
Continuous		 1056L (89s Ellerslie - 629s Argyll Transfer Station) 1056L: Pole Refurbishment  
ALTALINK, EPCOR 26-May-25 07:00 01-Jun-25 17:00 6.42 Days
Continuous		 1056L (89s Ellerslie - 629s Argyll Transfer Station) Pole Refurbishment  
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 09:00 08-Jun-25 17:30 13.35 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 26-May-25 09:00 08-Jun-25 17:30 13.35 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 26-May-25 09:00 08-Jun-25 17:30 13.35 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		  
ALTALINK 26-May-25 11:30 29-May-25 17:30 3.25 Days
Continuous		 102s SVC (102s Langdon), 102s T4 (102s Langdon) 102sT4 PRC5, Doble and replace PD monitor.  
ALTALINK 26-May-25 13:30 29-May-25 17:30 3.17 Days
Continuous		 310p 452 (310p Sundance) Replacement of 240kV Koncar CTs associated with 310p452  
ALTALINK 27-May-25 07:30 27-May-25 18:00 10.5 Hours
Daily		 138s 1152 (138s Windy Flats), 138s 1252 (138s Windy Flats), 967L (138s Windy Flats - 370s North Lethbridge) Urgent outage to change CT ratios on CT11 and CT12. Changing ratios from 2000/5 to 3000/5  
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 31-May-25 15:00 3.33 Days
Continuous		 250p T2 (250p Bighorn Plant) maintenance  
ALTALINK 28-May-25 07:30 28-May-25 18:00 10.5 Hours
Daily		 138s 852 (138s Windy Flats), 138s 952 (138s Windy Flats), 968L (138s Windy Flats - 370s North Lethbridge) Urgent outage to change CT ratios on CT8 and CT9. Changing ratios from 2000/5 to 3000/5  
SUNCOR 28-May-25 08:00 04-Jun-25 18:00 7.42 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  
Saskpower 28-May-25 09:00 29-May-25 18:00 1.38 Days
Continuous		 SASK POWER P2C maintenance AB-SK
ALTALINK 29-May-25 07:00 29-May-25 18:00 11 Hours
Daily		 777L (48s Pocaterra - 245s Seebe) URGENT South Crew will be replacing failing crossarm at 777L98 See also 58L/90L/76L RB 295028 that goes with this due to proximity  
EPCOR 30-May-25 02:00 30-May-25 16:00 14 Hours
Continuous		 987s CGB2 (987s Clover Bar), 987s GT2 (987s Clover Bar) metering upgrade  
EPCOR 01-Jun-25 02:00 07-Jun-25 16:00 6.58 Days
Continuous		 987s CGB2 (987s Clover Bar), 987s GT2 (987s Clover Bar) Metering Upgrade  
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  
EPCOR 02-Jun-25 07:00 27-Jun-25 17:00 25.42 Days
Continuous		 557s T1 (557s Castle Downs) Castle Downs S/S Tx1 bay outage  
ALTALINK 02-Jun-25 07:30 06-Jun-25 16:30 4.38 Days
Continuous		 AML 511s 240kV ACF 1 Bus (511s Crossings) 511s1652 Breaker Maintenance, SVC+ Inspections and Maintenance  
ATCO, CNRL 02-Jun-25 08:00 07-Jun-25 08:00 5 Days
Continuous		 859s 701T (859s Primrose), 859s 701TD (859s Primrose), 859s 704 (859s Primrose), 859s 701 (859s Primrose) Perform maintenance activities in 859S.  
ALTALINK 02-Jun-25 08:00 12-Jun-25 18:00 10.42 Days
Continuous		 928L (17s Benalto - 42s Sarcee) 21 sub expansion - Iconic civil work, drilling ground wells in vicinity of the line.  
Syncrude 02-Jun-25 08:00 16-Jun-25 16:00 14.33 Days
Continuous		 D05 517 (D05), D05 517A (D05), D05 517B (D05), D05 518 (D05), D05 516 (D05), D05 516A (D05), D05 516B (D05), D05 513 (D05), D05 513A (D05), D05 513B (D05), D05 509 (D05), T2 (D05 Syncrude), D05 78 (D05), D05 78A (D05), D05 78B (D05) SCL - D05 Substation is due for its 6-Year 260kV and 72KV PM. This substation will be isolated in Zones to not interrupt Production.  
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  
ALTALINK, EPCOR 02-Jun-25 09:30 05-Jun-25 17:00 3.31 Days
Continuous		 1057L (89s Ellerslie - 657s Summerside), 89s 452 (89s Ellerslie), 89s 352 (89s Ellerslie) Summerside: 1057L Zone Doble and SUDS1/SUDS3/SUDS9 Disconnect Maintenance  
EPCOR 03-Jun-25 02:00 10-Jun-25 16:00 7.58 Days
Continuous		 987s GT3 (987s Clover Bar), 987s CGB3 (987s Clover Bar) Metering Upgrade  
ALTALINK, BCH 03-Jun-25 06:00 03-Jun-25 19:00 13 Hours
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
ALTALINK 03-Jun-25 07:00 05-Jun-25 18:00 2.46 Days
Continuous		 861L (71s Lamoureux - 258s Dow Hydrocarbons) Maintenance and component replacements on various structures between 4-55.  
ALTALINK, ENEL 03-Jun-25 07:30 05-Jun-25 16:30 2.38 Days
Continuous		 205s T2 (205s Castle Rock Ridge) Full site outage to facilitate 240kV CTPT replacement, MPT leak repair, and Annual Maintenance checklist items.  
ALTALINK, BCH 03-Jun-25 08:00 10-Jun-25 17:00 7.38 Days
Continuous		 1L274 (BCH Natal - BCH Line Creek tap) NTL station rebuild stage 6.2 BC maintenance does not affect the Alberta ATC
AB-BC
ALTALINK, BCH 03-Jun-25 09:00 10-Jun-25 17:00 7.33 Days
Continuous		 1L274 (BCH Natal - BCH Line Creek tap) Replace end-of-life SPAR crossarms BC maintenance does not affect the Alberta ATC
AB-BC
ALTALINK, BCH 03-Jun-25 19:01 10-Jun-25 17:00 6.92 Days
Continuous		 1L274 (BCH Natal - BCH Line Creek tap), 1CB1 (BCH Natal) NTL Station Upgrade Project. EVR owned 60L288 OOS to remove conductors above on 1L274, 1L274-old AB-BC
SUNCOR 05-Jun-25 08:00 10-Jun-25 18:00 5.42 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  
SUNCOR 07-Jun-25 08:00 10-Jun-25 20:00 3.5 Days
Continuous		 29EDD-1 29EDD1s552 (29EDD-1 Millennium), 29EDD-1 29EDD1s652 (29EDD-1 Millennium) PRC-005 check  
EPCOR 09-Jun-25 07:00 20-Jun-25 17:00 11.42 Days
Continuous		 657s T2 (657s Summerside) Summerside: TX2 DGA LCR  
EPCOR 09-Jun-25 07:00 27-Jun-25 17:00 18.42 Days
Continuous		 52s E2401 (52s East Industrial), 52s T1 (52s East Industrial) East Industrial: TX1 Protection Upgrade Cutovers  
ATCO 09-Jun-25 09:30 10-Jun-25 17:30 1.33 Days
Continuous		 801s 902 (801s Anderson) BREAKER MIN OIL HLR PARTIAL TESTING - BREAKER 902 @ 801S  
ATCO 09-Jun-25 12:00 12-Jun-25 17:00 3.21 Days
Continuous		 951s SVC (951s Thickwood) Semi Annual inspection & maintenance  
ALTALINK 09-Jun-25 12:30 11-Jun-25 19:00 2.27 Days
Continuous		 723s T2 (723s Christina Lake), 723s 252 (723s Christina Lake) 25kV Breaker maintenance (723s490, 723s523, 723s1552, 723s2274. 723s2275, 723s1152). Doble, maintenance, various other maintenance/corrective/leaks repair (T2 TX18788). Replace cooper cutouts w/ new polymer cutouts (723s31, 723s24). Wormgear handle rep  
ALTALINK 09-Jun-25 13:00 12-Jun-25 17:00 3.17 Days
Continuous		 370s 23 (370s North Lethbridge) First Trip, breaker maintenance  
ALTALINK, EPCOR 11-Jun-25 07:00 11-Jun-25 18:00 11 Hours
Daily		 1139L (367s Harry Smith - EP Riverview) Replace insulators on structure 58  
ALTALINK, EPCOR 11-Jun-25 07:00 11-Jun-25 18:00 11 Hours
Continuous		 1139L (367s Harry Smith - EP Riverview) ALTALINK - 1139L - GOI @ RIVERVIEW  
BCH 11-Jun-25 09:00 13-Jun-25 17:00 2.33 Days
Continuous		 1L274 (978s BCH Britt Creek - BCH Greenhills tap) Purpose: Replace structures BC maintenance does not affect the Alberta ATC
AB-BC
ATCO 11-Jun-25 09:30 12-Jun-25 17:30 1.33 Days
Continuous		 801s 903 (801s Anderson) BREAKER MIN OIL HLR PARTIAL TESTING - BREAKER 903 @ 801S  
ATCO 11-Jun-25 10:00 11-Jun-25 12:00 2 Hours
Continuous		 717s 701 (717s Ethel Lake), 7L28 (717s Ethel Lake - 846s Grand Centre) PRC-005 TRIP COIL TESTING  
EPCOR 12-Jun-25 02:00 12-Jun-25 16:00 14 Hours
Continuous		 987s GT1 (987s Clover Bar), 987s CGB1 (987s Clover Bar) metering upgrade  
ALTALINK, EPCOR 12-Jun-25 07:00 13-Jun-25 17:00 1.42 Days
Continuous		 1045L (310p Sundance - 1045AL tap), 1045L (EP 805s Jasper - 1045AL tap), 1045AL (320p Keephills - 1045L tap), EP 805s J2407 (EP 805s Jasper), EP 805s J2406 (EP 805s Jasper) insulator repair  
ALTALINK 12-Jun-25 08:30 14-Jun-25 19:00 2.44 Days
Continuous		 723s T1 (723s Christina Lake), 723s 152 (723s Christina Lake) Filter pack leak repair, IDD troubleshoot, replace/investigate TC/MT gauges, oil level gauge leak repair, bushing monitor fail (T1 TX18707). Repair wormgear handle, bearing, switch adjustment, microohms (723s3). 240kV breaker maintenance, trouble alarm, leaking dashpot (72s152)  
ENMAX, ALTALINK 13-Jun-25 11:00 13-Jun-25 13:00 2 Hours
Continuous		 36.81L (44s Bearspaw Plant - SS-36), 36B138-36.81 (SS-36) HV Breaker SF6 Gas Sample - 36B138-36.81  
ENMAX, ALTALINK 13-Jun-25 11:00 13-Jun-25 13:00 2 Hours
Daily		 36.81L (44s Bearspaw Plant - SS-36) HV Breaker SF6 Gas Sample - 36B138-36.81  
EPCOR 16-Jun-25 02:00 16-Jun-25 16:00 14 Hours
Continuous		 987s CGB1 (987s Clover Bar), 987s GT1 (987s Clover Bar) Metering Upgrade  
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 17-Jun-25 16:00 1.33 Days
Continuous		 7.82L (42s Sarcee - SS-7) Replace connection point on shield wire weld tabs on structure  
ALTALINK 16-Jun-25 08:00 20-Jun-25 17:00 4.38 Days
Continuous		 786L (799s Coleman - BCH Natal) To move this fiber run to accommodate construction for a wildlife underpass. 786L will be required to be de- energized.  
ATCO 16-Jun-25 10:00 20-Jun-25 17:30 4.31 Days
Continuous		 959s 901T (959s Lanfine) TRANSFORMER CLASS1 MAJOR TESTING - 901T @ 959S
TRANSFORMER CLASS1 TAP CHANGER - 901T @ 959S
Qualitrol ITM/ETM Settings Updates - 901T Updates at 959s Lanfine		  
ALTALINK 16-Jun-25 11:30 20-Jun-25 16:30 4.21 Days
Continuous		 650s SVC (650s Hansman Lake), 650s T3 (650s Hansman Lake) Maintenance on SVC. SVC resistor replacement. T3 maintenance. Fire System inspection and testing. Replace palmer insulators that are failing.  
ATCO 16-Jun-25 12:00 20-Jun-25 16:00 4.17 Days
Continuous		 885s 902T (885s McMillan) 885S McMillan Replace 1 Single Phase Reactor in 501R
902T Major & Tap Changer Refurbishment		  
ALTALINK 17-Jun-25 08:00 17-Jun-25 15:00 7 Hours
Daily		 650s 240kV Bus 2 (650S Hansman Lake), 948L (650s Hansman Lake - 863s Paintearth), 1047L (574s Nilrem - 650s Hansman Lake) Replace insulators on 240kV overhead line to SVC  
ALTALINK 17-Jun-25 09:00 21-Jun-25 09:00 4 Days
Continuous		 163s T1 (163s Amoco Empress) Plains to unbolt/re-connect cabling from Altalink buss into plains substation for cable testing. Unbolt cabling/re- connect T1X, T1Y NGR feeds for cable and NGR testing. Scaffold to be built in yard behind Plains substation to access cable entries.  
ATCO 17-Jun-25 09:30 18-Jun-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  
ENMAX, ALTALINK 20-Jun-25 12:00 20-Jun-25 16:00 4 Hours
Continuous		 28.80L (42s Sarcee - SS-28), 28B138-28.80 (SS-28) HV Breaker SF6 Gas Sample - 28B138-28.80  
Syncrude 21-Jun-25 08:00 07-Jul-25 16:00 16.33 Days
Continuous		 D05 517 (D05), D05 517A (D05), D05 517B (D05), D05 519 (D05), D05 519A (D05), D05 519B (D05), D05 511A (D05), D05 511B (D05), D05 511 (D05), D05 71 (D05), D05 71A (D05), D05 71B (D05), D05 510 (D05), T1 (D05 Syncrude) D05 6 Year Zone PM is due for Maintenance.  
ATCO 23-Jun-25 09:30 27-Jun-25 17:30 4.33 Days
Continuous		 757s 912T (757s Battle River) TRANSFORMER CLASS1 MAJOR TESTING - 912T @ 757S
BREAKER MIN OIL HPF COMPLETE TESTING - 710 @ 757S		  
ATCO 23-Jun-25 10:00 27-Jun-25 17:30 4.31 Days
Continuous		 963s 901T (963s Coyote Lake), 7L128 (963s Coyote Lake - 7LA128 tap), 9L29 (946s Oakland - 963s Coyote Lake) TRANSFORMER CLASS1 TAP CHANGER - 901T @ 963S
TRANSFORMER CLASS1 MAJOR TESTING - 901T @ 963S
Qualitrol ITM/ETM Settings Updates - 901T Updates at 963s Coyote Lake		  
ALTALINK 23-Jun-25 11:30 26-Jun-25 18:30 3.29 Days
Continuous		 1140L (89s Ellerslie - 289s Saunders Lake) 89s1052 Breaker maintenance + First Trip. Replace broken insulator on bus between 89s952 and 89s1052. Repair 89s1140.  
ALTALINK 23-Jun-25 11:30 26-Jun-25 18:30 3.29 Days
Continuous		 89s T1 (89s Ellerslie) 89s T1 Doble and maintenance. Replace gas detector relay. Update Qualitrol settings. Repair oil leaks.  
ATCO 23-Jun-25 12:00 04-Jul-25 16:00 11.17 Days
Continuous		 826s 901T (826s Marguerite Lake) transformer major maintenance  
ALTALINK 24-Jun-25 08:00 25-Jun-25 17:00 1.38 Days
Continuous		 510s 2552 (510s Sunnybrook) replace grading caps  
ALTALINK 24-Jun-25 08:30 24-Jun-25 16:30 8 Hours
Daily		 356s 152 (356s Milo) 356s152/PRC5/Maint.  
ALTALINK 25-Jun-25 07:00 25-Jun-25 16:00 9 Hours
Daily		 413L (239s Castle River - 632s Russell) maintenance  
ALTALINK 25-Jun-25 08:30 25-Jun-25 16:30 8 Hours
Daily		 356s 552 (356s Milo) 356s552 PRC5/Maint./Counter Replacement  
ALTALINK, TRANSALTA 25-Jun-25 08:30 25-Jun-25 16:30 8 Hours
Daily		 59s T1 (59s Peigan) 59s T1 LA replacement 138kV  
ALTALINK 26-Jun-25 08:30 26-Jun-25 16:30 8 Hours
Daily		 356s 652 (356s Milo) 356s652 PRC5/Maint./Gas top up  
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 30-Jun-25 07:00 18-Jul-25 17:00 18.42 Days
Continuous		 557s T2 (557s Castle Downs) Castle Downs S/S Tx2 Bay Outage  
SUNCOR 30-Jun-25 08:00 14-Jul-25 18:00 14.42 Days
Continuous		 29PL7-2 (29EDD-18 Firebag - 29EDD-63), 29EDD-63 29PT-179 (29EDD-63 Firebag Co-Gen), 29EDD-63 30-252-11301 (29EDD-63) maintenance  
ATCO 30-Jun-25 09:00 02-Jul-25 16:00 2.29 Days
Continuous		 ATC 793s 701 (ATC 793s West Peace River), 7L51 (ATC 793s West Peace River - 927s Buchanan Creek) BREAKER SF6 HPL COMPLETE TESTING - 701 @ 793S  
ATCO 30-Jun-25 09:30 30-Jun-25 17:30 8 Hours
Continuous		 801s 907 (801s Anderson) BREAKER MIN OIL HLR PARTIAL TESTING - 905 @ 801S  
ATCO 30-Jun-25 10:00 04-Jul-25 17:30 4.31 Days
Continuous		 813s SVC (813s Little Smoky) SVC GLYCOL COOLED MAINTENANCE  
ALTALINK 02-Jul-25 07:00 02-Jul-25 12:00 5 Hours
Daily		 786L (799s Coleman - BCH Natal), 799s 786W (799s Coleman) T3 protection trip testing and auto-restore function testing.  
BCH 02-Jul-25 07:00 02-Jul-25 12:00 5 Hours
Continuous		 1L275 (799s Coleman - BCH Natal) AltaLink COL T3 protection trip test and auto reclose function testing AB-BC
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 06-Jul-25 17:00 4.42 Days
Continuous		 909L (89s Ellerslie - 665s Dome) TX3/DS26/909L Zone Doble and DDS1/DDS12/DDS13/DDS17/SDS3 Disconnect Maintenance and D721/D2404 Breaker Maintenance  
ATCO 02-Jul-25 09:30 03-Jul-25 17:30 1.33 Days
Continuous		 801s 905 (801s Anderson) BREAKER MIN OIL HLR PARTIAL TESTING - 905 @ 801S  
ATCO 02-Jul-25 10:30 04-Jul-25 15:30 2.21 Days
Continuous		 7L91 (715s Leming Lake - 826s Marguerite Lake) GOI required for climbing inspection on 7L91 and for deficiency repair.  
ALTALINK 02-Jul-25 12:00 02-Jul-25 17:00 5 Hours
Daily		 170L (632s Russell - 799s Coleman), 799s T3 (799s Coleman), 799s 138kV Bus (799s Coleman), 799s 170E (799s Coleman) T3 protection trip testing, MOD operation and auto-restore function testing.  
ATCO 02-Jul-25 13:30 03-Jul-25 16:30 27 Hours
Continuous		 939s 910 (939s Livock), 939s 911 (939s Livock), 939s 903T (939s Livock) Trouble shoot switch issues on 910A switch and TRIP COIL TESTING.  
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
BCH 03-Jul-25 09:00 14-Jul-25 17:00 11.33 Days
Continuous		 2L113 (BCH Cranbrook - BCH Natal) Insulator Replacement BC maintenance does not affect the Alberta ATC AB-BC
BCH 03-Jul-25 10:00 04-Jul-25 18:00 1.33 Days
Continuous		 2L113 (BCH Cranbrook - BCH Natal) placeholder NTL 2D21 & 2L113 OOS for 2D21 control cutover and testing, for Natal substation rebuild project. 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 08:00 14-Jul-25 16:00 7.33 Days
Continuous		 7L32 (813s Little Smoky - 862s South Bezanson) Pole changes  
ATCO 07-Jul-25 09:00 09-Jul-25 12:00 2.13 Days
Continuous		 826s 903 (826s Marguerite Lake) BREAKER MAINTENANCE  
ATCO 07-Jul-25 10:00 10-Jul-25 16:00 3.25 Days
Continuous		 732s 901T (732s Mitsue), 732s 702 (732s Mitsue), 732s 701 (732s Mitsue) transformer class1 major testing  
ATCO 07-Jul-25 10:30 10-Jul-25 15:30 3.21 Days
Continuous		 7L89 (700s Bonnyville - 721s La Corey) GOI required for climbing inspection on 7L89 and for deficiency repair.  
ATCO 07-Jul-25 11:00 11-Jul-25 16:00 4.21 Days
Continuous		 898s 902T (898s Heart Lake) transformer maintenance  
ALTALINK 07-Jul-25 12:30 10-Jul-25 16:30 3.17 Days
Continuous		 632s PS1 (632s Russell), 632s 452 (632s Russell), 632s 552 (632s Russell) 632s PS1 FAC501 TC major, 632s452, 632s552  
ALTALINK 08-Jul-25 08:00 09-Jul-25 17:00 1.38 Days
Continuous		 510s 2052 (510s Sunnybrook) replace grading caps  
ALTALINK 08-Jul-25 08:00 09-Jul-25 17:00 1.38 Days
Continuous		 510s 1352 (510s Sunnybrook) replace grading caps  
ALTALINK 08-Jul-25 08:00 10-Jul-25 17:00 2.38 Days
Continuous		 39s T2 (39s Bickerdike) Camlin Unit Install  
ATCO 08-Jul-25 09:00 09-Jul-25 16:00 31 Hours
Continuous		 828s 701 (828s Sulphur Point), 7L93 (828s Sulphur Point - 930s Arcenciel) BREAKER SF6 LTB145D1/B COMPLETE TESTING - 701 @ 828S  
ALTALINK, EPCOR 09-Jul-25 07:00 25-Jul-25 17:00 16.42 Days
Continuous		 1044L (EP 805s Jasper - 816s Petrolia), EP 805s J2404 (EP 805s Jasper), EP 805s J2403 (EP 805s Jasper), EP 805s J2408 (EP 805s Jasper), 805s C1 (805s Jasper) Jasper 1044L/Cap Bank: Infrastructure Upgrade Project  
ATCO 09-Jul-25 12:01 12-Jul-25 16:00 3.17 Days
Continuous		 826s 904 (826s Marguerite Lake) BREAKER MAINTENANCE  
ATCO 12-Jul-25 09:00 13-Jul-25 16:00 31 Hours
Continuous		 828s 703 (828s Sulphur Point), 7L133 (786s High Level - 828s Sulphur Point) BREAKER SF6 LTB145D1/B COMPLETE TESTING - 703 @ 828S  
ALTALINK 14-Jul-25 08:00 14-Jul-25 12:00 4 Hours
Daily		 170L (632s Russell - 799s Coleman), 799s 138kV Bus (799s Coleman) Outage required for T3 test energization.  
ATCO 14-Jul-25 09:00 16-Jul-25 12:00 2.13 Days
Continuous		 826s 907 (826s Marguerite Lake) BREAKER MAINTENANCE  
BCH 14-Jul-25 09:00 18-Jul-25 17:00 4.33 Days
Continuous		 5L96 (BCH Selkirk - BCH Vaseux Lake) replace markerballs and insulators BC maintenance does not affect the Alberta ATC AB-BC
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  
ALTALINK 14-Jul-25 10:30 16-Jul-25 17:30 2.29 Days
Continuous		 17s T3 (17s Benalto) PRC005 Doble, maintenance, alarming issue  
ATCO 14-Jul-25 10:30 17-Jul-25 15:30 3.21 Days
Continuous		 7L89 (721s La Corey - 826s Marguerite Lake) GOI required for climbing inspection on 7L89 and for deficiency repair.  
ALTALINK 15-Jul-25 08:00 16-Jul-25 17:00 1.38 Days
Continuous		 510s 2652 (510s Sunnybrook) replace grading caps  
BCH 15-Jul-25 09:00 22-Jul-25 17:00 7.33 Days
Continuous		 2L294 (BCH A. A. Lambert - BCH Cranbrook) insulator replacement, BC maintenance does not affect the Alberta ATC AB-BC
ALTALINK 16-Jul-25 08:00 16-Jul-25 13:00 5 Hours
Continuous		 786L (799s Coleman - BCH Natal) Cut in breakers for future Open Point at 786L Str122. AB-BC
ALTALINK, TRANSALTA 16-Jul-25 10:00 16-Jul-25 14:00 4 Hours
Daily		 250p T1 (250p Bighorn Plant) maintenance  
ATCO 16-Jul-25 12:01 18-Jul-25 16:00 2.17 Days
Continuous		 826s 908 (826s Marguerite Lake) BREAKER MAINTENANCE  
ALTALINK 16-Jul-25 13:00 16-Jul-25 15:00 2 Hours
Continuous		 786L (799s Coleman - BCH Natal) Close Open Point 'C' 170L to 786L creating bypass around 799s, and creating open point D. AB-BC
ALTALINK, TRANSALTA 17-Jul-25 10:00 17-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  
ALTALINK 21-Jul-25 08:00 25-Jul-25 17:00 4.38 Days
Continuous		 786L (799s Coleman - BCH Natal) To move this fiber run to accommodate construction for a wildlife underpass. 786L will be required to be de- energized.  
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 21-Jul-25 09:30 22-Jul-25 17:30 1.33 Days
Continuous		 801s 906 (801s Anderson) BREAKER MIN OIL HLR PARTIAL TESTING- BREAKER 906 @ 801S  
ALTALINK 21-Jul-25 09:30 31-Jul-25 10:30 10.04 Days
Continuous		 935L (324s Cassils - 356s Milo) South Crew will be doing component replacement on 935L STR 53-148; See also 923L RB 294938 that does with this due to proximity  
ATCO 21-Jul-25 12:00 24-Jul-25 16:00 3.17 Days
Continuous		 2011s 901T (2011s Dawes) TRANSFORMER CLASS1 MAJOR TESTING - 901T @ 2011S
TRANSFORMER CLASS1 TAP CHANGER - 901T @ 2011S		  
ALTALINK 21-Jul-25 16:00 21-Jul-25 18:00 2 Hours
Daily		 245s 777X (245s Seebe), 777L (48s Pocaterra - 245s Seebe) Protection upgrade project on 81/138B protection at 245s Seebe. AB-BC
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		  
BCH 23-Jul-25 09:00 31-Jul-25 17:00 8.33 Days
Continuous		 2L294 (BCH A. A. Lambert - BCH Cranbrook), T3 (BCH Cranbrook) Insulator Replacement. BC maintenance does not affect the Alberta ATC AB-BC
ATCO 23-Jul-25 09:30 24-Jul-25 17:30 1.33 Days
Continuous		 801s 909 (801s Anderson) BREAKER MIN OIL HLR PARTIAL TESTING - 909 @ 801S  
ALTALINK 23-Jul-25 12:30 23-Jul-25 18:00 5.5 Hours
Continuous		 777L (48s Pocaterra - 245s Seebe), 245s 777X (245s Seebe) protection upgrade project on 81/138B protection at 245s Seebe AB-BC
ATCO 23-Jul-25 13:00 25-Jul-25 17:30 2.19 Days
Continuous		 2029s ACF21 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ATCO 25-Jul-25 11:00 25-Jul-25 12:00 60 Mins
Continuous		 774s 701 (774s Monitor), 7L224 (650s Hansman Lake - 774s Monitor) PRC-005 - TRIP COIL TESTING - BREAKER 701 @ 774S  
ALTALINK, EPCOR 27-Jul-25 07:00 01-Aug-25 17:00 5.42 Days
Continuous		 657s SU2403 (657s Summerside), 657s SU2402 (657s Summerside), 657s T2 (657s Summerside) Summerside: TX2 Zone Doble and Disconnect Maintenance  
ALTALINK, EPCOR 28-Jul-25 07:00 31-Jul-25 17:00 3.42 Days
Continuous		 1045L (EP 805s Jasper - 1045AL tap), EP 805s J2406 (EP 805s Jasper), EP 805s J2407 (EP 805s Jasper) Jasper 1045L Zone: Infrastructure Upgrade Project  
ALTALINK, EPCOR 28-Jul-25 07:00 31-Jul-25 17:00 3.42 Days
Continuous		 1045AL (320p Keephills - 1045L tap), 1045L (310p Sundance - 1045AL tap), 1045L (EP 805s Jasper - 1045AL tap) Jasper 1045L Zone: Infrastructure Upgrade Project  
ATCO 28-Jul-25 09:00 30-Jul-25 12:00 2.13 Days
Continuous		 2029s ACF12 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ATCO 28-Jul-25 09:30 31-Jul-25 14:30 3.21 Days
Continuous		 809s 902T (809s Louise Creek) BREAKER SF6 LTB145D1/B COMPLETE TESTING - 702 @ 809S
902TD and 910A @ 809S Louise Creek Require Readjusting		  
ALTALINK, EPCOR 28-Jul-25 09:30 01-Aug-25 17:00 4.31 Days
Continuous		 920L (71s Lamoureux - 557s Castle Downs) EPCOR 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  
ALTALINK, EPCOR 28-Jul-25 09:30 08-Aug-25 17:00 11.31 Days
Continuous		 1059L (38s East Edmonton - 1059AL tap) Pole Refurbishment  
ALTALINK 29-Jul-25 08:00 29-Jul-25 16:00 8 Hours
Daily		 893L (312s Fidler - 893AL tap), 893L3J (893BL tap) Testing of the Motor Operated Disconnect (MOD) and Surge arrestors.  
ATCO 30-Jul-25 13:00 01-Aug-25 17:30 2.19 Days
Continuous		 2029s ACF22 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ENMAX, ALTALINK 04-Aug-25 08:00 15-Aug-25 16:00 11.33 Days
Continuous		 20.82L (SS-20 - SS-21), 21.80L (42s Sarcee - SS-21), 21.1TR (SS-21), 21.4TR (SS-21) 21.1TR Replacement. Decommission, remove existing 21.1TR and associated equipment.  
ALTALINK 05-Aug-25 07:00 08-Aug-25 18:00 3.46 Days
Continuous		 935L (324s Cassils - 356s Milo) South Crew will be doing component replacement on 935L STR 53-148, See also 294944 923L RB that goes with this due to proximity.  
SUNCOR 05-Aug-25 08:00 15-Aug-25 20:00 10.5 Days
Continuous		 29EDD-56 29PT-190 (29EDD-56) 29EDD-56;29PT-190 SYSTEM;PM 5y; 29EDD56;29PP-41H SYSTEM;PM 5Y/10Y  
ATCO 05-Aug-25 09:00 06-Aug-25 17:30 1.35 Days
Continuous		 2029s ACF13 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
ATCO 05-Aug-25 09:30 07-Aug-25 17:30 2.33 Days
Continuous		 801s 912 (801s Anderson) BREAKER MIN OIL HLR PARTIAL TESTING - 912 @ 801S
Breaker 912 N.W. Pole Low Oil at 801s Anderson		  
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.  
ALTALINK 07-Aug-25 07:00 09-Aug-25 18:00 2.46 Days
Continuous		 199L (347s AML Fox Creek - 741s ATC Fox Creek) Pile install for new telecom tower. Update 347s199W breaker maintenance switch and associated circuits.  
ATCO 07-Aug-25 09:00 08-Aug-25 17:30 1.35 Days
Continuous		 2029s ACF23 (2029s Heathfield) FILTER BANK AC MAINTENANCE  
EPCOR 11-Aug-25 07:00 24-Aug-25 17:00 13.42 Days
Continuous		 657s T1 (657s Summerside) Summerside: TX1 DGA Apparatus Install (First week), TX1 Doble/Disconnect Maintenance and P&C/SCADA DGA Commissioning (Second week)  
ALTALINK 11-Aug-25 09:00 11-Aug-25 13:30 4.5 Hours
Daily		 199L (347s AML Fox Creek - 199AL tap) Update 347s199E breaker maintenance switch and associated circuits.  
ATCO 11-Aug-25 09:00 13-Aug-25 12:00 2.13 Days
Continuous		 825s 901 (825s Whitefish Lake) BREAKER MAINTENANCE  
ALTALINK, EPCOR 11-Aug-25 09:30 15-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  
ATCO, ALTALINK 11-Aug-25 09:30 15-Aug-25 18:00 4.35 Days
Continuous		 923L (356s Milo - 2075s Newell) South Crew will be doing component replacement on 923L STR 74-162. See also 294945 935L RB required due to proximity to 923L  
ATCO 11-Aug-25 10:00 14-Aug-25 17:30 3.31 Days
Continuous		 813s 901T (813s Little Smoky) PRC-005 - SPR TESTING - TRANSFORMER 901T @ 813S
TRANSFORMER CLASS1 MAJOR TESTING - 901T @ 813S
TRANSFORMER CLASS1 TAP CHANGER - 901T @ 813S
PRC-005 - TRIP COIL TESTING - BREAKER 501 @ 813S
BREAKER VACUUM VA8012 COMPLETE TESTING - 501 @ 813S		  
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 11-Aug-25 10:00 15-Aug-25 17:30 4.31 Days
Continuous		 959s SVC (959s Lanfine) SVC CONVERTER INSPECTION
Fire System Inspection @ LANFINE 959S		  
ALTALINK 11-Aug-25 10:30 14-Aug-25 17:30 3.29 Days
Continuous		 87s T2 (87s Gaetz) PRC005 Doble, maintenance, leaks  
ATCO 11-Aug-25 11:00 13-Aug-25 17:00 2.25 Days
Continuous		 876s 902T (876s Brintnell) TRANSFORMER CLASS1 MAJOR TESTING - 902T @ 876S  
ALTALINK 11-Aug-25 12:30 15-Aug-25 18:00 4.23 Days
Continuous		 410s T2 (410s Josephburg) Replace H2 bushing, doble, maint, oil leaks  
ALTALINK, TRANSALTA 12-Aug-25 07:00 14-Aug-25 13:00 2.25 Days
Continuous		 33s 138kV Bus (33s Spray), 33s T1 (33s Spray), 33s T2 (33s Spray) Replace 33s1 CT13 all 3 Phases. Remove old TAU communication cable.  
ATCO 12-Aug-25 10:00 13-Aug-25 17:00 31 Hours
Continuous		 9L56 (720s Wabasca - 876s Brintnell), 876s 902 (876s Brintnell), 876s 904 (876s Brintnell) Heater Repair 904 in breaker mech
CT Circuit issues on 99R-3/9L56 test handle		  
ATCO 13-Aug-25 12:01 15-Aug-25 16:00 2.17 Days
Continuous		 825s 902 (825s Whitefish Lake) BREAKER MAINTENANCE  
SUNCOR 16-Aug-25 08:00 26-Aug-25 20:00 10.5 Days
Continuous		 29EDD-56 29PT-191 (29EDD-56) 29EDD56;29PT-191 SYSTEM;PM 5Y/10Y;29EDD56;29PP-41C SYSTEM;PM 5y  
ALTALINK 17-Aug-25 10:00 20-Aug-25 16:30 3.27 Days
Continuous		 702L (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
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  
ALTALINK, EPCOR 18-Aug-25 07:00 29-Aug-25 17:00 11.42 Days
Continuous		 1044L (EP 805s Jasper - 816s Petrolia), 816s P2405 (816s Petrolia), 816s P2406 (816s Petrolia), EP 805s J2403 (EP 805s Jasper), EP 805s J2404 (EP 805s Jasper) 1044L Zones: Jasper: JDS25 LCR and Petrolia 1044L CT LCR  
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 09:30 21-Aug-25 17:30 3.33 Days
Continuous		 801s 911 (801s Anderson) BREAKER MIN OIL HLR COMPLETE TESTING - 911 @ 801S  
ATCO 18-Aug-25 14:01 15-Sep-25 14:00 28 Days
Continuous		 732s 704 (732s Mitsue), 732s 705 (732s Mitsue), 732s 901 (732s Mitsue), 732s 902T (732s Mitsue), 732s 906 (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 20-Aug-25 07:00 22-Aug-25 18:00 2.46 Days
Continuous		 199L (347s AML Fox Creek - 741s ATC Fox Creek) Install new telecom tower  
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  
ENMAX, ALTALINK 22-Aug-25 07:00 26-Aug-25 17:00 4.42 Days
Continuous		 50L (44s Bearspaw Plant - SS-21) Altalink outage. : Replacing structures 116 & 117  
ENMAX, ALTALINK 22-Aug-25 07:00 26-Aug-25 18:00 4.46 Days
Continuous		 50L (44s Bearspaw Plant - SS-21) Replacing structures 116 & 117.  
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  
ALTALINK, EPCOR 25-Aug-25 09:30 29-Aug-25 17:00 4.31 Days
Continuous		 915L (38s East Edmonton - 987s Clover Bar) Cloverbar: 915L Zone Doble and CDS35/CDS36/CDS37 Disconnect Maintenance  
ALTALINK 28-Aug-25 13:00 06-Oct-25 09:00 38.83 Days
Continuous		 786L (799s Coleman - BCH Natal), 799s 786W (799s Coleman), 799s 138kV Bus (799s Coleman) Remove s29 from foundation, repair foundation, install s29 and adjust  
ATCO, ALTALINK 02-Sep-25 07:00 10-Sep-25 18:00 8.46 Days
Continuous		 1036L (356s Milo - 554s Travers) South Crew will be doing component replacement on 1036L (STR 5 - 101)See also 294976 1005L RB required due to proximity  
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  
EPCOR 02-Sep-25 07:00 26-Sep-25 17:00 24.42 Days
Continuous		 805s T1 (805s Jasper) Jasper: TX1 Bushing Replacement (PCB)  
ALTALINK 02-Sep-25 07:30 12-Sep-25 16:00 10.35 Days
Continuous		 1325L (510s Sunnybrook - AML 511s Crossings) 510s DIW Piping Repair, Annual Link Outage for various maintenance.  
ALTALINK 03-Sep-25 08:00 10-Sep-25 17:00 7.38 Days
Continuous		 1011L (163s Amoco Empress - 562s Cypress) Line outage required for 163s1352 Breaker Replacement, Breaker will be new SF6 Type  
ATCO 03-Sep-25 09:30 04-Sep-25 17:30 1.33 Days
Continuous		 755s 901 (755s Cordel) BREAKER SF6 GL315 COMPLETE TESTING - BREAKER 901 @ 755S
TCM Program. RTXP Test Switch Mitigation and Replacement: 50BF/901 @ 755S		  
ATCO 03-Sep-25 09:30 04-Sep-25 17:30 1.33 Days
Continuous		 802s 704 (802s Michichi Creek), 7L128 (802s Michichi Creek - 7LA128 tap) BREAKER MIN OIL HLR PARTIAL TESTING - BREAKER 704 @ 802S  
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  
BCH 08-Sep-25 09:00 18-Sep-25 17:00 10.33 Days
Continuous		 5L92 (BCH Cranbrook - BCH Selkirk) replace insulators & spacers AB-BC
ATCO 08-Sep-25 09:30 09-Sep-25 17:30 1.33 Days
Continuous		 755s 902 (755s Cordel) BREAKER SF6 GL315 COMPLETE TESTING - BREAKER 902 @ 755S
TCM Program. RTXP Test Switch Mitigation and Replacement: 50BF/902 @ 755S		  
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  
ALTALINK, EPCOR 08-Sep-25 09:30 12-Sep-25 17:00 4.31 Days
Continuous		 921L (71s Lamoureux - 987s Clover Bar) Cloverbar: 921L Zone Doble and CDS30/CDS32/CDS40 Disconnect Maintenance  
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		  
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  
SUNCOR 10-Sep-25 08:00 19-Sep-25 20:00 9.5 Days
Continuous		 29EDD-34 29PT-341 (29EDD-34), 29EDD-34 29-952-142 (29EDD-34), 29EDD-34 29-952-143 (29EDD-34), 29EDD-34 29PS-0375 (29EDD-34), 29EDD-34 29-652-10200T (29EDD-34), 29EDD-34 29-652-10301 (29EDD-34), 29EDD-34 29-652-10302 (29EDD-34), 29EDD-34 29-652-10303 (29EDD-34), 29EDD-34 29PS-0380 (29EDD-34), 29EDD-34 29PS-0381 (29EDD-34), 29EDD-34 29PS-0382 (29EDD-34), 29EDD-34 29PS-609 (29EDD-34), 29EDD-34 29PS-610 (29EDD-34) 10 year PM on 29EDD34;29PT-341 system and 5 year, 10 year PM on 29EDD34;29PP-103 system
  
ENMAX, ALTALINK 12-Sep-25 18:00 14-Sep-25 08:00 1.58 Days
Continuous		 936L (5s East Calgary - 102s Langdon) Reconductor between str 15 to 18 on both Circuits for line Clearance Mitigation  
ENMAX, ALTALINK 12-Sep-25 18:00 14-Sep-25 08:00 1.58 Days
Continuous		 937L (5s East Calgary - 102s Langdon) Crew working in vicinity of 936L  
ENMAX, ALTALINK 12-Sep-25 18:00 14-Sep-25 08:00 1.58 Days
Continuous		 937L (5s East Calgary - 102s Langdon) Crew working in vicinity of 936L  
ENMAX, ALTALINK 12-Sep-25 18:00 14-Sep-25 08:00 1.58 Days
Continuous		 936L (5s East Calgary - 102s Langdon) Reconductor between str 15 to 18 on both Circuits for line Clearance Mitigation  
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  
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, EPCOR 15-Sep-25 09:30 21-Sep-25 17:00 6.31 Days
Continuous		 909L (310p Sundance - 665s Dome) Dome: 909LE/TX2 Doble and DDS4/DDS5/DAB2 Disconnect Maintenance and Relay Maintenance  
ATCO 15-Sep-25 10:00 03-Oct-25 17:30 18.31 Days
Continuous		 840s McNeill Station CONVERTER INSPECTION @ MCNEILL 840S
BREAKER SF6 HPL COMPLETE TESTING - 702 @ 840S
BREAKER SF6 HPL COMPLETE TESTING - 703 @ 840S
TRANSFORMER CLASS1 MAJOR TESTING - 901T @ 840S
TRANSFORMER CLASS1 TAP CHANGER - 901T @ 840S
901T Oil Leak Absorption Repairs At 840s McNeill
BREAKER VACUUM VA8012 COMPLETE 		AB-SK
ALTALINK 15-Sep-25 12:30 18-Sep-25 17:30 3.21 Days
Continuous		 359s T2 (359s Esso West Pembina), 359s 202AX (359s Esso West Pembina) Bushing replacement, Doble, maintenance, leaks, LTC maintenance  
ALTALINK, TRANSALTA 16-Sep-25 07:00 17-Sep-25 18:00 1.46 Days
Daily		 514L (396s Pincher Creek - 514BL tap), 514L (513s Lundbreck - 514BL tap), 322s T1 (322s Cowley Ridge) Replacing structures 16 and 76 Replacing arms and insulators on structure 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)  
ALTALINK 19-Sep-25 07:00 30-Sep-25 17:00 11.42 Days
Continuous		 1201L (520s Bennett - BCH Cranbrook) South Crew will be completing component replacement from 1201L21 – 1201L435 AB-BC
ALTALINK 19-Sep-25 07:00 30-Sep-25 17:00 11.42 Days
Continuous		 799s 786W (799s Coleman), 786L (799s Coleman - BCH Natal) 786L required to be open due to 1201L as per AESO Rule AB-BC
ALTALINK 19-Sep-25 07:00 30-Sep-25 17:00 11.42 Days
Continuous		 48s 887X (48s Pocaterra), 887L (48s Pocaterra - 978s BCH Britt Creek) 887L required to be open due to 1201L as per AESO Rule AB-BC
BHE Canada 19-Sep-25 07:00 30-Sep-25 17:00 11.42 Days
Continuous		 MATL (120s Picture Butte - Montana) align with 1201L outage AB-MATL
AESO 19-Sep-25 07:00 30-Sep-25 17:00 11.42 Days
Continuous		 Path 1 (AIES Islanding) align with 1201L outage AB-BC
ENMAX, ALTALINK 19-Sep-25 18:00 21-Sep-25 08:00 1.58 Days
Continuous		 936L (5s East Calgary - 102s Langdon) Crew working in vicinity of 937L  
ENMAX, ALTALINK 19-Sep-25 18:00 21-Sep-25 08:00 1.58 Days
Continuous		 937L (5s East Calgary - 102s Langdon) Reconductor between str 15 to 18 on both Circuits for line Clearance Mitigation  
ENMAX, ALTALINK 19-Sep-25 18:00 21-Sep-25 08:00 1.58 Days
Continuous		 936L (5s East Calgary - 102s Langdon) Crew working in vicinity of 937L  
SUNCOR 20-Sep-25 08:00 30-Sep-25 20:00 10.5 Days
Continuous		 29EDD-34 29PT-340 (29EDD-34) 29EDD34;29PT-340 SYSTEM;PM 5y,10y; 29EDD34;29PP-102 SYSTEM;PM 5y,10y
  
ENMAX, ALTALINK 21-Sep-25 08:00 07-Oct-25 16:00 16.33 Days
Continuous		 50L (44s Bearspaw Plant - SS-21), 21.1C (SS-21), 21.2TR (SS-21) 21.2TR Replacement. Decommission, remove existing 21.2TR and associated equipment  
ALTALINK, EPCOR 22-Sep-25 07:00 25-Sep-25 17:00 3.42 Days
Continuous		 947L (89s Ellerslie - 987s Clover Bar), 987s C2402 (987s Clover Bar), 987s C2404 (987s Clover Bar) Cloverbar: 947L Zone Doble and CDS27/CDS28/CDS29 Disconnect Maintenance  
EPCOR 22-Sep-25 07:00 04-Oct-25 17:00 12.42 Days
Continuous		 EP 803s T3 (EP 803s Lambton), EP 803s L721 (EP 803s Lambton), 72LH8 (EP 803s Lambton - EP Hardisty), 72LS24 (EP 803s Lambton - Strathcona) Lambton/LH8/LS24: LDS11/LDS12 LCR and L721 Breaker Maintenance (Min Oil) and PT Doble  
Lethbridge 22-Sep-25 08:00 22-Sep-25 17:00 9 Hours
Continuous		 674s 725W (674s Bowron) Salvage old Transformer Protection Trips from early project in spring  
ALTALINK 22-Sep-25 10:00 22-Sep-25 17:00 7 Hours
Daily		 725L (674s Bowron - 725BL tap) Test/Trip 674ss T1 Protections  
ALTALINK 22-Sep-25 12:30 25-Sep-25 16:30 3.17 Days
Continuous		 310p T30 (310p Sundance) Bushing replacement, maintenance, and leak repair  
ATCO 22-Sep-25 13:00 25-Sep-25 16:00 3.13 Days
Continuous		 7L28 (717s Ethel Lake - 846s Grand Centre) 7L28 Line to ground clearance mitigation  
ALTALINK, EPCOR 22-Sep-25 13:00 25-Sep-25 17:00 3.17 Days
Continuous		 1043L (320p Keephills - 367s Harry Smith), 320p 352 (320p Keephills), 320p 252 (320p Keephills) Replace 320p289  
Lethbridge 23-Sep-25 08:00 23-Sep-25 17:00 9 Hours
Continuous		 674s 725E (674s Bowron) Salvage old Protection Trips from early project at 674s  
ALTALINK 23-Sep-25 08:00 23-Sep-25 17:00 9 Hours
Daily		 725L (674s Bowron - 725AL tap) Test/Trip 674ss T1 Protections  
ALTALINK, TRANSALTA 26-Sep-25 09:00 26-Sep-25 12:00 3 Hours
Daily		 33s T1 (33s Spray) testing  
ALTALINK, TRANSALTA 26-Sep-25 13:00 26-Sep-25 16:00 3 Hours
Daily		 33s T2 (33s Spray) testing  
ALTALINK 29-Sep-25 12:00 02-Oct-25 18:30 3.27 Days
Continuous		 89s T2 (89s Ellerslie) 89s T2 Doble and maintenance. Replace gas detector relay. Update Qualitrol settings. Repair oil leaks.  
ATCO 29-Sep-25 13:00 02-Oct-25 16:00 3.13 Days
Continuous		 7L28 (717s Ethel Lake - 846s Grand Centre) 7L28 Line to ground clearance mitigation  
ATCO 29-Sep-25 14:01 27-Oct-25 14:00 28 Days
Continuous		 732s 701 (732s Mitsue), 732s 702 (732s Mitsue), 732s 901T (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.  
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
ALTALINK 02-Oct-25 08:15 02-Oct-25 13:45 5.5 Hours
Daily		 853L (28s West Brooks - 853AL tap), 853L75 (853AL tap), 28s 25 (28s West Brooks), 28s 28 (28s West Brooks) Insulator replacement  
ALTALINK 03-Oct-25 08:00 03-Oct-25 14:00 6 Hours
Daily		 1052L (28s West Brooks - 324s Cassils) Replace 28s 1052L Strain Insulators, See also 294659 827L RB, & 1051L (28s-324s) - RB Required due to proximity.  
ALTALINK 06-Oct-25 08:30 06-Oct-25 16:30 8 Hours
Continuous		 786L (799s Coleman - BCH Natal) Open "Open Point 'C' 170L to 786L removing bypass around 799s. AB-BC
BCH 06-Oct-25 09:00 17-Oct-25 17:00 11.33 Days
Continuous		 2L112 (BPA Boundary - BCH Nelway), 2D24 (BCH Nelway), 2D2CB7 (BCH Nelway) NLY 2SA2 2SA12 replacement, BC maintenance does not affect the Alberta ATC 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 06-Oct-25 13:00 09-Oct-25 16:00 3.13 Days
Continuous		 7L28 (717s Ethel Lake - 846s Grand Centre) 7L28 Line to ground clearance mitigation  
ALTALINK 07-Oct-25 07:00 10-Oct-25 18:00 3.46 Days
Continuous		 944L (132s Ware Junction - 275s Jenner) Modifying existing structure 944L156 from a tangent assembly to a floating DE/phase raise configuration to tap onto a new adjacent substation. See also SAP: 294514 951L RB required due to proximity  
ALTALINK 07-Oct-25 12:30 07-Oct-25 16:00 3.5 Hours
Continuous		 786L (799s Coleman - BCH Natal) Remove breakers for Open Point 'D' at Str122. AB-BC
ATCO 08-Oct-25 09:30 09-Oct-25 17:30 1.33 Days
Continuous		 7L85 (801s Anderson - ATC 803s Bullpound), 801s 705 (801s Anderson) BREAKER SF6 LTB145D1/B COMPLETE TESTING - 705 @ 801S  
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  
ALTALINK 09-Oct-25 07:00 10-Oct-25 18:00 1.46 Days
Continuous		 786L (799s Coleman - BCH Natal) Replacing complete dead end structure due to Woodpecker damage (STR 113)  
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  
ATCO 10-Nov-25 14:01 24-Nov-25 14:00 14 Days
Continuous		 732s 901 (732s Mitsue), 732s 902 (732s Mitsue), 9L40 (732s Mitsue - 809s Louise Creek) Protection upgrade. Remove old protection, cut over to new protection and cut over equipment status, control and alarms to new station controller.  
ATCO 13-Nov-25 09:00 27-Nov-25 17:00 14.33 Days
Continuous		 840s McNeill Station Replace failed control system parts  
ATCO 17-Nov-25 10:00 24-Nov-25 16:00 7.25 Days
Continuous		 7L106 (834s Wesley Creek - 905s Meikle) Soil around the tower footings has eroded ( Tower Replacement )  
ATCO 17-Nov-25 10:00 24-Nov-25 16:00 7.25 Days
Continuous		 7L131 (834s Wesley Creek - 905s Meikle) Soil around the tower footings has eroded ( Tower Replacement )  
ATCO 24-Nov-25 15:00 08-Dec-25 14:00 13.96 Days
Continuous		 732s 903 (732s Mitsue), 732s 904 (732s Mitsue), 9L913 (69s North Barrhead - 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 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  
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  
ATCO 12-Jan-26 13:00 21-Jan-26 09:00 8.83 Days
Continuous		 9L57 (939s Livock - 960s Birchwood Creek) 9L57 Line to Ground Clearance Mitigation  
ATCO 12-Jan-26 13:00 26-Jan-26 14:00 14.04 Days
Continuous		 732s 904 (732s Mitsue), 732s 906 (732s Mitsue), 9L56 (720s Wabasca - 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 26-Jan-26 13:00 04-Feb-26 09:00 8.83 Days
Continuous		 9L57 (939s Livock - 960s Birchwood Creek) 9L57 Line to Ground Clearance Mitigation  
ATCO 09-Feb-26 13:00 18-Feb-26 09:00 8.83 Days
Continuous		 9L57 (939s Livock - 960s Birchwood Creek) 9L57 Line to Ground Clearance Mitigation  
ATCO 17-Feb-26 09:00 03-Mar-26 17:00 14.33 Days
Continuous		 972s 240kV Bus 900BS1 (972s Tinchebray) Install Breaker 904 and 904CT
On release leave Bkr 904, 904A/904B closed as feed through (disable bkr trips), Bkr 901 still protecting 9L93		  
ATCO 23-Feb-26 13:00 04-Mar-26 09:00 8.83 Days
Continuous		 9L57 (939s Livock - 960s Birchwood Creek) 9L57 Line to Ground Clearance Mitigation  
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
  
ALTALINK 03-Mar-26 07:00 09-Mar-26 17:00 6.38 Days
Continuous		 944L (132s Ware Junction - 275s Jenner) Line outage to replace line protection relays at 132s Ware Junction, replace relay comm cards and update settings on line protections at 275s Jenner and implement third terminal 1080s Jurassic line protection relays. End to end testing between all three sites.  
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 09-Mar-26 13:00 18-Mar-26 09:00 8.83 Days
Continuous		 9L57 (939s Livock - 960s Birchwood Creek) 9L57 Line to Ground Clearance Mitigation  
ATCO 10-Mar-26 09:00 14-Apr-26 17:00 35.33 Days
Continuous		 972s 240kV Bus 900BS2 (972s Tinchebray) Install Breakers 905/906, 905CT/906CT, switches 905A/906B
On release leave Bkrs 905/906, 905A/905B, and 906A/906B closed as feed through (disable bkr trips), Bkr 903 still protecting 9L93, leave new 9L62D1 open for future line connection		  
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) 29EDD1;29CVT-1 SYSTEM;PM 5y,10y  
ATCO, SUNCOR 30-Mar-26 08:00 05-Apr-26 20:00 6.5 Days
Continuous		 6L32 (29EDD-1 Millennium - 737s ATC Horseshoe) 29EDD1;29CVT-6 SYSTEM;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 21-Apr-26 09:00 26-Apr-26 17:00 5.33 Days
Continuous		 9LA93 (973s Lanes Lake - 9L93 tap) Cutover and commission 9L93 protection ccts from Bkrs 901/903 to Bkrs 904/905
**AESO NEEDS TO ADD 9L93, 973S 9LA93D1**
  
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) 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.  
ATCO 05-May-26 09:00 06-May-26 17:00 1.33 Days
Continuous		 972s 240kV Bus 900BS1 (972s Tinchebray) Connect new 907B to 900BS1
  
ATCO 07-May-26 09:00 08-May-26 17:00 1.33 Days
Continuous		 972s 240kV Bus 900BS2 (972s Tinchebray) Connect new 909A to 900BS2  
ATCO, ALTALINK 10-May-26 07:00 15-May-26 17:00 5.42 Days
Continuous		 7LA114 (658s Chard - 7L114 tap), 7L114 (72s Leismer - 7LA114 tap), 7L114 (907s Waddell - 7LA114 tap), 907s Waddell AltaLink outage on 72sT2 causing an outage to 7L114 at 907S  
SUNCOR 18-May-26 08:00 24-May-26 20:00 6.5 Days
Continuous		 29PL9-12 (29EDD-34 - 29EDD-65) 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 02-Jun-26 09:00 13-Jun-26 17:00 11.33 Days
Continuous		 972s 905B (972s Tinchebray), 972s 906A (972s Tinchebray) Connect new 9L62 to 972S and prepare to energize.
String Conductors/OPGW 9L62 from Str #3 to substation A-frame deadends and connect to 9L62D1, coordinate with AML conductor jumpers and OPGW termination at the TFO boundary 9L86 Str 409		  
ATCO 14-Jun-26 09:00 25-Jun-26 17:00 11.33 Days
Continuous		 ATCO RTU/SCADA Work on parallel line 9L86  
ATCO 16-Jun-26 09:00 25-Jun-26 17:00 9.33 Days
Continuous		 972s 240kV Bus 900BS2 (972s Tinchebray) Connect new 9L86 to 972S and prepare to energize.
String Conductors/OPGW 9L86 from Str #3 to substation A-frame deadends and connect to 9L86D1, coordinate with AML conductor jumpers and OPGW termination at the TFO boundary 9L86 Str 409
Complete protection commissioning		  
ATCO 16-Jun-26 10:00 18-Jun-26 16:00 2.25 Days
Continuous		 9L74 (888s Dover - 960s Birchwood Creek) 9L74 bypass. Cutover line to temp bypass structures  
ATCO 10-Aug-26 10:00 13-Aug-26 16:30 3.27 Days
Continuous		 7L702 (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ALTALINK 10-Aug-26 10:00 13-Aug-26 16:30 3.27 Days
Continuous		 702L (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ATCO 17-Aug-26 10:00 20-Aug-26 16:30 3.27 Days
Continuous		 7L702 (137s Sedgewick - 757s Battle River) Interphase spacers and pole replacements  
ATCO 19-Oct-26 10:00 22-Oct-26 16:00 3.25 Days
Continuous		 888s 906 (888s Dover) 21B/9L74 relay replacement. Cutover breaker and CT to new protection  
ATCO 23-Oct-26 10:00 26-Oct-26 16:00 3.25 Days
Continuous		 888s 905 (888s Dover) 21B/9L74 relay replacement. Cutover breaker and CT to new protection  
ATCO 02-Nov-26 10:00 05-Nov-26 16:00 3.25 Days
Continuous		 9L74 (888s Dover - 960s Birchwood Creek) 21B/9L74 relay three terminal line testing  
ATCO 09-Nov-26 10:00 12-Nov-26 16:00 3.25 Days
Continuous		 888s 906 (888s Dover) 21A/9L74 relay replacement. Cutover breaker and CT to new protection  
ATCO 13-Nov-26 10:00 16-Nov-26 16:00 3.25 Days
Continuous		 888s 905 (888s Dover) 21B/9L74 relay replacement. Cutover breaker and CT to new protection  
ATCO 23-Nov-26 10:00 26-Nov-26 16:00 3.25 Days
Continuous		 9L74 (888s Dover - 960s Birchwood Creek) 21B/9L74 relay three terminal line testing  
ATCO 09-Feb-27 09:00 11-Feb-27 17:00 2.33 Days
Continuous		 7L228 (845s Big Mountain - 7L20 tap) AESO project P2716 - Install 7L228 bypass to facilitate the installation of new line switches for the new 7LA228 T-tap line connection to the new 2103S Pakenham substation
Open 7L228, replace structures 551 and 551A, connect bypass.		  
ATCO 24-Feb-27 09:00 25-Feb-27 17:00 1.33 Days
Continuous		 959s 240kV Bus 900BS1 (959s Lanfine) Connect new bus from new 902B to existing switch 901A to add new line 9L141,
Cutover and commission 900PT1 ccts to new 9L141 relays		  
ATCO 26-Feb-27 09:00 27-Feb-27 17:00 1.33 Days
Continuous		 959s 240kV Bus 900BS2 (959s Lanfine) Connect new bus from new Bkr 903 to existing switch 903B to add new line 9L141,
Cutover and commission 900PT2 ccts to new 9L141 relays		  
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 16-Mar-27 09:00 18-Mar-27 17:00 2.33 Days
Continuous		 7L228 (845s Big Mountain - 7L20 tap) AESO project P2716 - Disconnect bypass, connect new 7LA228D1 to 7LA228 Str #2, connect 7L228 to 7L228D2, connect 7L228 to 7L228D3. Renumber existing line switches 7L228D2 - D4, 7L228D3 - D5, 7L228D4 - D6
Commission DTT from Pakenham to Big Mountain		  
ATCO 26-Mar-27 09:00 29-Mar-27 17:00 3.33 Days
Continuous		 740s 704 (740s H.R. Milner), 7L20 (740s H.R. Milner - 810s Dome Cutbank) AESO project P2716 - cut over RAS #171 wiring at 740S, relay programming, commission LTO 7L20/7L228  
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
  
ATCO 08-Nov-27 09:00 11-Nov-27 17:00 3.33 Days
Continuous		 ALC02L (409s Shell Scotford - 879s Upgrader) Install new Deadend corner structure on ALC02L  
ATCO 08-Nov-27 09:00 11-Nov-27 17:00 3.33 Days
Continuous		 ALC01L (408s Air Liquide Scotford - 409s Shell Scotford) Install new Deadend corner structure on ALC02L.  

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: 2025-05-14   14:16:14


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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