Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2021-01-30

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 24-Jan-20 08:00 31-Mar-21 16:00 432.29 Days
Continuous		 2029s ACF13 (2029s Heathfield) forced outage repairs  
EPCOR 31-Aug-20 07:00 31-Mar-21 23:59 212.71 Days
Continuous		 805s C1 (805s Jasper) forced  
BCH 04-Jan-21 08:00 04-Feb-21 16:00 31.33 Days
Continuous		 1L274 (48s Pocaterra - Britt Creek) structure refurbishment AB-BC
ALTALINK, EPCOR 12-Jan-21 16:00 08-Feb-21 09:00 26.71 Days
Continuous		 909L (310p Sundance - 665s Dome) work on structures 909L2 - 909L6, installing one new tower, and salvaging one new tower  
ALTALINK 14-Jan-21 18:01 09-Feb-21 09:00 25.62 Days
Continuous		 1045L (310p Sundance - 1045AL) preliminary outage request to work on 1045L Str 12, installing one new tower, and salvaging one new tower  
Saskpower 18-Jan-21 07:00 05-Feb-21 16:30 18.4 Days
Continuous		 Sask Power SW901T maintenance AB-SK
ATCO 18-Jan-21 08:00 01-Feb-21 16:00 14.33 Days
Continuous		 7L32 (811s Clairmont Lake - 862s South Bezanson) 811s protection upgrades, 710CT modification, logic/alarms, SCADA updates & end-end checks and wiring  
ALTALINK, EPCOR 01-Feb-21 07:00 04-Feb-21 07:00 3 Days
Continuous		 997L (71s Lamoureux - 410s Josephburg), 71s1252, 71s1352, 71s1452 (921L & 997L), 921L (71s Lamoureux - 987s Clover Bar), 71s 1252 (71s Lamoureux), 71s 1352 (71s Lamoureux), 71s 1452 (71s Lamoureux) Replacing DC Junction Box  
EPCOR 01-Feb-21 07:00 05-Feb-21 17:00 4.42 Days
Continuous		 Cloverbar S/S Tie Tx2 bay outage, 987s T2 (987s Clover Bar), 987s T4 (987s Clover Bar) Outage required for breaker op-checks  
EPCOR 01-Feb-21 07:00 05-Feb-21 17:00 4.42 Days
Continuous		 Jasper S/S Tx3 bay outage, 805s T3 (805s Jasper) Outage required for breaker op-checks  
SUNCOR 01-Feb-21 08:00 04-Feb-21 18:00 3.42 Days
Daily		 29PL9-13, 29PL9-13 (29EDD-34 - 29EDD-65) Protection and Control Relays of 260kV line 29PL9-13 and P&C trip testing  
ATCO 01-Feb-21 08:00 08-Feb-21 12:00 7.17 Days
Continuous		 7L64, 7L64 (779s Chinchaga River - 789s Keg River) Changing cross arms for wildfire mitigation  
ATCO 01-Feb-21 08:00 11-Feb-21 15:30 10.31 Days
Continuous		 7L228, 7L228 (845s Big Mountain - 2091s Thornton) Mitigation work, changing poles and wire work  
ALTALINK 01-Feb-21 09:00 01-Feb-21 18:00 9 Hours
Daily		 863L (618s - 863L162A) GOI, 863L (618s Riverbend - 891L tap) Asset Management as requested Insulator Bells Resistance testing on 863L Root Cause Investigation Structures Range 79-159  
ALTALINK, EPCOR 01-Feb-21 12:00 02-Feb-21 18:00 30 Hours
Continuous		 920L (37s-E557s) - GOI, 920L (37s North Calder - 557s Castle Downs) Component's and Fire Mitigation Bundled Str's range 2-24  
ALTALINK 02-Feb-21 09:00 02-Feb-21 15:00 6 Hours
Daily		 283s to 384s Radio - TPR Repair TELUS communication.  
ATCO 03-Feb-21 07:00 07-Feb-21 17:00 4.42 Days
Continuous		 9L101, 9L101 (957s McClelland - 2005s Secord) Line move for mine expansion.
Attach new line to existing 9L101		  
ALTALINK, EPCOR 03-Feb-21 07:00 07-Feb-21 18:00 4.46 Days
Continuous		 920L (71s-E557s) - GOI, 920L (71s Lamoureux - 557s Castle Downs) Component's and Fire Mitigation Bundled Str's range 26-100  
ALTALINK 03-Feb-21 08:30 03-Feb-21 13:30 5 Hours
Daily		 356s652 GOI Emergency Repair; low gas 'C' phase, investigate, fill and repair  
ALTALINK 03-Feb-21 13:31 03-Feb-21 17:30 3.98 Hours
Daily		 356s952 GOI Emergency Repair; replace breaker heaters  
ALTALINK 04-Feb-21 07:00 11-Feb-21 10:00 7.13 Days
Continuous		 71s1352 (997L)- GOI, 71s 1352 (71s Lamoureux) Replacing M/O Breaker with a new SF6 Breaker  
EPCOR, ALTALINK 08-Feb-21 07:00 11-Feb-21 17:00 3.42 Days
Continuous		 Cloverbar S/S 947L bay outage, 947L (89s Ellerslie - 987s Clover Bar) Outage required for breaker op-checks  
ALTALINK 08-Feb-21 07:15 10-Feb-21 17:45 2.44 Days
Continuous		 50L (44s - C21s) GOI, 50L (44s Bearspaw Plant - ENMAX 21) Calgary Ring Road 50L line clearance – Outage required for bolt replacement on new Str 133 and 134 and 135 steel poles.  
ALTALINK 08-Feb-21 07:15 19-Feb-21 17:45 11.44 Days
Daily		 461L (198s - 212s) GOI, 461L (198s Blackfalds - 212s N.E. Lacombe) Scope of work includes replacing structures 18, 19, 20, 30, 31, 39, 68, 70, 73, 74, 76, 100, 102 and 103 and maintenance on structures 21, 22 and 69  
BCH 08-Feb-21 08:00 21-Feb-21 17:00 13.38 Days
Continuous		 Natal T4 (BCH Natal) 2B1 PN upgrades AB-BC
ALTALINK, EPCOR 08-Feb-21 09:00 08-Feb-21 16:00 7 Hours
Continuous		 909L (310p - E665s) - GOI, 909L (310p Sundance - 665s Dome) Closing temporary Open Point 'C' @ Structure #1A  
ALTALINK 08-Feb-21 10:00 09-Feb-21 18:00 1.33 Days
Continuous		 277s T2, 138kV Bus & 25kV Bus #2 - GOI Protections on 277s852 will be completed  
ATCO 08-Feb-21 12:00 31-Mar-21 12:00 50.96 Days
Continuous		 7L64, 7L64 (747s Bassett - 748s Haig River), 7L64 (747s Bassett - 930s Arcenciel), 7L64 (748s Haig River - 779s Chinchaga River) Changing cross arms for wildfire mitigation  
EPCOR, ALTALINK 09-Feb-21 07:00 11-Feb-21 17:00 2.42 Days
Continuous		 Jasper S/S 1045L bay outage, 805s J2407 (805s Jasper), 805s J2406 (805s Jasper), 1045L (805s Jasper - 1045AL Tap) Outage required for breaker op-checks  
ENMAX 09-Feb-21 08:00 09-Feb-21 16:00 8 Hours
Continuous		 162B240-RB135 162B240-RB135 Replace motor cut off switch  
ALTALINK, EPCOR 09-Feb-21 09:00 09-Feb-21 18:00 9 Hours
Continuous		 1045L/1045AL (310p - 320p - E805s) - GOI, 1045L (310p Sundance - 320p Keephills - 805s Jasper) Closing temporary Open Point 'A' @ Structure #1A & Open Point 'B' @ Structure #31  
ATCO 09-Feb-21 10:00 15-Feb-21 17:00 6.29 Days
Continuous		 9L57, 9L57 (939s Livock - 960s Birchwood Creek) Setting poles for new OPGW  
ALTALINK 10-Feb-21 07:00 17-Feb-21 19:00 7.5 Days
Continuous		 1325L (510s - 511s) - GOI, 1325L (510s Sunnybrook - 511s Crossings) Annual Inspection and Maintenance, VCS and Valve Hall Work; AML Crews will be installing vibration recorders on Structures #491 & 494  
ALTALINK 10-Feb-21 07:30 10-Feb-21 17:00 9.5 Hours
Daily		 254S Coaldale Repair RAS  
ALTALINK, EPCOR 10-Feb-21 08:00 12-Feb-21 18:00 2.42 Days
Continuous		 920L (71s-E557s) - GOI, 920L (71s Lamoureux - 557s Castle Downs) Component's and Fire Mitigation Bundled Str's range 26-100  
ALTALINK 11-Feb-21 10:00 11-Feb-21 16:00 6 Hours
Daily		 71s1352 & 71s1452 (997L) - GOI, 71s 1352 (71s Lamoureux), 71s 1452 (71s Lamoureux), 997L (71s Lamoureux - 410s Josephburg) Replacing risers on 71s1352  
BCH 12-Feb-21 09:00 12-Feb-21 17:00 8 Hours
Continuous		 1L274 (1D2L274 - 1D3L274) insulator replacement AB-BC
ALTALINK 13-Feb-21 06:15 15-Feb-21 15:45 2.4 Days
Continuous		 892L (244s - 895s) GOI, 892L (244s Bowmanton - 895s Suffield) Outage Required for Component Replacement and Structure changes From structure 146 to 252. Line to be out continuous.  
ENMAX, ALTALINK 13-Feb-21 08:00 14-Feb-21 16:00 1.33 Days
Continuous		 37.82L. 37.2TR, 37.82L (74s Janet - ENMAX 37), 37.2TR (ENMAX 37) HV SW maint SW84, SW85, SW86, MD-37.2TR  
ATCO 13-Feb-21 10:00 16-Mar-21 16:00 31.21 Days
Continuous		 9L99, 9L99 (801s Anderson - 807s Sheerness) customer complete their substation lighting work. There is also work planned for 901A disconnect,  
ALTALINK 15-Feb-21 08:15 18-Feb-21 15:45 3.31 Days
Continuous		 1083L (63s - 288s) GOI, 1083L (63s Red Deer - 288s Wolf Creek) Replacement of existing switch 63s1083  
ATCO 15-Feb-21 10:00 22-Feb-21 16:00 7.25 Days
Continuous		 7L20, 7L20 (740s H.R.Milner - 810s Dome Cutbank) Replacement of under rated and rotten crossarms  
ALTALINK 16-Feb-21 06:15 19-Feb-21 15:45 3.4 Days
Daily		 892L (244s - 895s) GOI, 892L (244s Bowmanton - 895s Suffield) Outage Required for Component Replacement and Structure changes From structure 146 to 252. Line to be out daily.  
ALTALINK 16-Feb-21 07:00 17-Feb-21 18:00 1.46 Days
Continuous		 1041L (370s - 554s) GOI, 1041L (370s North Lethbridge - 554s Travers) Install phase raiser assemblies 1041L Str 208 bottom phase for line clearance mitigation..  
EPCOR 16-Feb-21 07:00 19-Feb-21 17:00 3.42 Days
Continuous		 Lambton S/S Tx1 bay outage, 803s T1 (803s Lambton), 803s L2401 (803s Lambton), 803s L2402 (803s Lambton) Outage required breaker op-checks  
EPCOR, ALTALINK 16-Feb-21 07:00 19-Feb-21 17:00 3.42 Days
Continuous		 Petrolia/Jasper S/S 1044L bay outage, 1044L (805s Jasper - 816s Petrolia) Outage required for breaker op-checks  
ALTALINK 16-Feb-21 07:00 09-Mar-21 18:00 21.46 Days
Continuous		 748L & 277s T1 - GOI, 748L (267s Killarney Lake - 277s Hayter) Installing a new 138kV Breaker and associated equipment  
ALTALINK 16-Feb-21 07:30 17-Feb-21 16:30 1.38 Days
Continuous		 511s SVC Plus - GOI, 511s SVC Plus (511s Crossings) SVC Plus SS Programming Upgrade; SVC Plus Fire System Cross-zoning  
ALTALINK 16-Feb-21 08:00 17-Feb-21 08:00 24 Hours
Continuous		 71s1252 - GOI, 71s 1252 (71s Lamoureux) Replacing M/O Breaker with a new SF6 Breaker  
ATCO 16-Feb-21 08:00 28-Feb-21 16:00 12.33 Days
Continuous		 790S 702, 7L22, 7L22 (790s Poplar Hill - 7L22D3), 790s 702 (790s Poplar Hill) Upgrade protection/alarms on 702 and 7L22 relays.  
BCH 16-Feb-21 09:00 26-Feb-21 17:00 10.33 Days
Continuous		 2L294 (A.A. Lambert - Nelway) flashed Insulator replacement and arcing horn installation AB-BC
ALTALINK, EPCOR 17-Feb-21 08:00 20-Feb-21 10:00 3.08 Days
Continuous		 71s1252 (T1 & 921L) - GOI, 71s T1 (71s Lamoureux), 71s 1252 (71s Lamoureux), 71s 1352 (71s Lamoureux), 921L (71s Lamoureux - 987s Clover Bar) Replacing M/O Breaker with a new SF6 Breaker  
ALTALINK 17-Feb-21 09:30 17-Feb-21 17:30 8 Hours
Daily		 266s FSC1 GOI test (possibly change) bad CT  
ALTALINK 18-Feb-21 08:00 19-Feb-21 18:30 1.44 Days
Continuous		 310p 240kV B Bus - GOI, 310p Sundance 240kV Bus B Scope of work includes replacing insulators on structures 310P and 1 on 1046L, Require a GOI on the B bus in order to safely handle the conductor running over the bus work Required for 1046L GOI SAP: 273239  
ALTALINK 18-Feb-21 08:00 23-Feb-21 18:00 5.42 Days
Continuous		 1046L (338s-310p) - GOI, 1046L (310p Sundance - 338s Cherhill) Scope of work includes maintenance on structures 1, 55, 57, 75, 89, 90, 91, 102, 111, 120 and 121. See Also 310p 240kV Bus GOI 273330 required to string overtop of the bus for 1046L  
ALTALINK 20-Feb-21 06:15 22-Feb-21 15:45 2.4 Days
Continuous		 892L (244s - 895s) GOI, 892L (244s Bowmanton - 895s Suffield) Outage Required for Component Replacement and Structure changes From structure 146 to 252. Line to be out continuous.  
ALTALINK, EPCOR 20-Feb-21 07:00 28-Feb-21 18:00 8.46 Days
Continuous		 1045L (310p-320p-E805s) - GOI, 1045L (310p Sundance - 320p Keephills - 805s Jasper) Install Phase raiser assemblies on structures 51, 52, 80, 81 for clearance mitigation  
ALTALINK 20-Feb-21 10:00 23-Feb-21 10:00 3 Days
Continuous		 71s1252 - GOI, 71s 1252 (71s Lamoureux) Replacing M/O Breaker with a new SF6 Breaker  
ALTALINK, EPCOR 21-Feb-21 07:00 21-Feb-21 18:00 11 Hours
Daily		 1058L (E803s-E657s) - GOI, 1058L (657s Summerside - 803s Lambton) Scope of work includes maintenance on str 17 See Also 273230 908L RB required due to proximity - Common Tower  
EPCOR 22-Feb-21 07:00 26-Feb-21 17:00 4.42 Days
Continuous		 Lambton S/S Tx2 bay outage, 803s T2 (803s Lambton) Outage required for breaker op-checks  
EPCOR 22-Feb-21 07:00 26-Feb-21 17:00 4.42 Days
Continuous		 Jasper S/S Tx4 bay outage, 805s T4 (805s Jasper) Outage required for breaker op-checks  
ALTALINK 22-Feb-21 08:15 25-Feb-21 15:45 3.31 Days
Continuous		 914L (63s - 87s) GOI, 914L (63s Red Deer - 87s Gaetz) Re placement of existing CVT 63s59  
ALTALINK 22-Feb-21 09:00 09-Mar-21 13:00 15.17 Days
Continuous		 901L (63s - 64s - 74s) Advice, 901L (63s Red Deer - 901AL), 901L (74s Janet - 901AL) Line protection upgrade for 901L at all three stations (three terminal line). Includes relay replacements/setting changes at 63s/74s and relay firmware/setting changes at 64s. Line breakers will be required for outage duration for commissioning purposes.  
ALTALINK 22-Feb-21 09:30 26-Feb-21 14:30 4.21 Days
Continuous		 17s717W (717L-262s) GOI, 717L (17s Benalto - 262s Rocky Mountain House) C60 Replacement and commissioning - See also below for trip tests associated with this work  
ALTALINK, EPCOR 22-Feb-21 12:00 25-Feb-21 18:00 3.25 Days
Continuous		 920L (37s - 557s) - GOI, 920L (37s North Calder - 557s Castle Downs) Replace 37s83 Switch  
ALTALINK 23-Feb-21 06:15 26-Feb-21 15:45 3.4 Days
Daily		 892L (244s - 895s) GOI, 892L (244s Bowmanton - 895s Suffield) Outage Required for Component Replacement and Structure changes From structure 146 to 252. Line to be out daily.  
ALTALINK, EPCOR 23-Feb-21 10:00 23-Feb-21 16:00 6 Hours
Daily		 71s1252 (T1 & 921L) - GOI, 71s T1 (71s Lamoureux), 71s 1252 (71s Lamoureux), 71s 1352 (71s Lamoureux), 921L (71s Lamoureux - 987s Clover Bar) 240kV West bus out of service to replace risers on 1252 breaker  
EPCOR, ALTALINK 24-Feb-21 07:00 26-Feb-21 17:00 2.42 Days
Continuous		 Cloverbar S/S 915L bay outage, 915L (38s East Edmonton - 987s Clover Bar) Outage required for breaker op-checks  
ALTALINK 24-Feb-21 09:00 02-Mar-21 18:00 6.38 Days
Continuous		 942L (71s - 681s) - GOI, 942L (71s Lamoureux - 681s Bannerman) Screw Pile installation and foundation work  
ALTALINK 24-Feb-21 09:00 02-Mar-21 18:00 6.38 Days
Continuous		 997L (71s - 410s) - GOI, 997L (71s Lamoureux - 410s Josephburg) Screw Pile installation and foundation work  
ALTALINK 26-Feb-21 08:15 26-Feb-21 17:45 9.5 Hours
Continuous		 914L (63s - 87s) GOI, 914L (63s Red Deer - 87s Gaetz) Re placement of existing CVT 63s36  
ALTALINK 27-Feb-21 06:15 01-Mar-21 15:45 2.4 Days
Continuous		 892L (244s - 895s) GOI, 892L (244s Bowmanton - 895s Suffield) Outage Required for Component Replacement and Structure changes From structure 146 to 252. Line to be out continuous.  
SUNCOR 28-Feb-21 08:00 06-Mar-21 18:00 6.42 Days
Continuous		 29PL9-5 (29EDD-1 Millennium - 29EDD-34), 29PL9-5/6 29PL9-5/6 - Repair broken jumper-JM  
EPCOR 01-Mar-21 07:00 05-Mar-21 17:00 4.42 Days
Continuous		 Lambton S/S Tx3 bay outage, 803s T3 (803s Lambton) Outage required for breaker op-checks  
EPCOR 01-Mar-21 07:00 05-Mar-21 17:00 4.42 Days
Continuous		 Jasper S/S Tx1/J240C1 bay outage, 805s T1 (805s Jasper), 805s C1 (805s Jasper), 72JW19 (805s Jasper - Woodcroft), 72JM18 (805s Jasper - Meadowlark) Outage required for breaker op-checks  
ATCO 01-Mar-21 08:00 14-Mar-21 16:00 13.29 Days
Continuous		 7L07, 790S 703, 790S 703 Recloser, 7L07 (790s Poplar Hill - 815s Goodfare), 790s 703 (790s Poplar Hill) Upgrade 703 and 7L07 protection  
ALTALINK, ATCO 01-Mar-21 09:15 12-Mar-21 17:45 11.35 Days
Daily		 1035L (244s - 2075s) GOI, 1035L (244s Bowmanton - 2075s Newell) Damper Replacements (Str's 38-389)  
ATCO 01-Mar-21 12:00 08-Mar-21 15:00 7.13 Days
Continuous		 9L11, 9L11 (813s Little Smoky - 834s Wesley Creek) Pole replacement and enforcers  
BCH 02-Mar-21 09:00 05-Mar-21 17:00 3.33 Days
Continuous		 5L98 (BCH Nicola - Vaseux Lake) disconnect switch inspections AB-BC
ALTALINK 03-Mar-21 07:00 04-Mar-21 18:00 1.46 Days
Daily		 748L/749AL & 267s Station - GOI, 748L (267s Killarney Lake - 277s Hayter) Installing a new 138kV Switch & salvaging the existing 138kV Bus  
ALTALINK 04-Mar-21 13:00 04-Mar-21 17:30 4.5 Hours
Daily		 562s36 (830L) GOI, 830L (562s Cypress - 840s McNeill Station) switch maintenance AB-SK
ALTALINK, EPCOR 06-Mar-21 07:00 14-Mar-21 18:00 8.42 Days
Continuous		 909L (310p- E665s) - GOI, 909L (310p Sundance - 665s Dome) Install Phase raiser assemblies on structures 51, 52, 80, 81 for clearance mitigation.  
ALTALINK 07-Mar-21 06:15 08-Mar-21 15:45 1.4 Days
Continuous		 892L (244s - 895s) GOI, 892L (244s Bowmanton - 895s Suffield) Outage Required for Component Replacement and Structure changes From structure 146 to 252. Line to be out continuous.  
EPCOR 08-Mar-21 07:00 08-Mar-21 17:00 10 Hours
Continuous		 TX2 @ Summerside E657S Summerside TX2 Tap Changer Maintenance  
EPCOR, ALTALINK 08-Mar-21 07:00 10-Mar-21 17:00 2.42 Days
Continuous		 Lambton S/S 1059L bay outage, 1059L (38s East Edmonton - 803s Lambton), 803s L2401 (803s Lambton), 803s L2404 (803s Lambton) Outage required for breaker op-checks  
ALTALINK 08-Mar-21 07:30 11-Mar-21 18:30 3.46 Days
Continuous		 38s7252 - GOI Replace CT31  
ALTALINK 08-Mar-21 08:00 11-Mar-21 19:00 3.46 Days
Continuous		 77s T2, 240/138kV East Bus - GOI, 77s T2 (77s Sagitawah), 77s Sagitawah 240 kV West Bus Replace 77s38. Replace 240kV East Bus Protection  
ATCO 08-Mar-21 09:00 12-Mar-21 16:00 4.29 Days
Continuous		 7L129, 7L129 (710s Vermilion - 918s Bauer) Mitigation work for crossing  
ALTALINK 08-Mar-21 11:00 31-Mar-21 18:00 23.25 Days
Continuous		 74sT2 TX18571 GOI, 74s T2 (74s Janet) Corrosive sulphur in oil. Will require the oil reclaim reclamation to remove corrosive Sulphur content in the oil.  
ALTALINK 08-Mar-21 12:00 11-Mar-21 18:00 3.25 Days
Continuous		 905L (37s - 19s) - GOI, 905L (19s Wabamun - 37s North Calder) Replace 37s77 & 37s79 Switches  
ALTALINK 09-Mar-21 06:15 12-Mar-21 15:45 3.4 Days
Daily		 892L (244s - 895s) GOI, 892L (244s Bowmanton - 895s Suffield) Outage Required for Component Replacement and Structure changes From structure 146 to 252. Line to be out daily.  
EPCOR 09-Mar-21 07:00 09-Mar-21 17:00 10 Hours
Continuous		 TX2 @ Poundmaker Poundmaker TX2 Tap Changer Maintenance  
ATCO 09-Mar-21 09:00 10-Mar-21 16:00 31 Hours
Continuous		 827S SVC Air Cooled Maintenance PM  
ALTALINK 10-Mar-21 07:15 11-Mar-21 17:45 1.44 Days
Continuous		 612L(368s - 336s) GOI, 612L (336s Fincastle - 368s Burdett) Scope of work includes maintenance on structures 87, 203, 206 and 212  
ALTALINK 10-Mar-21 08:30 10-Mar-21 12:29 3.98 Hours
Daily		 103s252 GOI investigate and top up gas  
ALTALINK 10-Mar-21 12:30 10-Mar-21 17:30 5 Hours
Daily		 103s552 GOI investigate and top up gas. replace thermostat  
ALTALINK 11-Mar-21 08:30 11-Mar-21 12:30 4 Hours
Daily		 103s352 GOI investigate and top up gas  
ALTALINK 13-Mar-21 08:00 13-Mar-21 19:00 11 Hours
Daily		 38s18 (T4) - GOI, 38s T4 (38s East Edmonton) Installation of Grading Capacitors to Breaker 38s18  
EPCOR, ALTALINK 15-Mar-21 07:00 15-Mar-21 17:00 10 Hours
Continuous		 Summerside S/S 1057L Bay Outage, 1057L (89s Ellerslie - 657s Summerside) DFR Upgrade  
EPCOR 15-Mar-21 07:00 17-Mar-21 17:00 2.42 Days
Continuous		 B2406 @ Bellamy E814S Bellamy B2406 Breaker Maintenance and Repair  
ATCO 15-Mar-21 09:00 18-Mar-21 16:00 3.29 Days
Continuous		 7L129, 7L129 (710s Vermilion - 918s Bauer) Mitigation work for crossing  
ALTALINK 15-Mar-21 09:00 18-Mar-21 19:00 3.42 Days
Continuous		 919L (77S - 310P) - GOI, 919L (77s Sagitawah - 310p Sundance) Replace 77s16 CVTs. Replace strain insulators on 919L at 77s.  
ALTALINK, ATCO 15-Mar-21 09:15 19-Mar-21 17:45 4.35 Days
Continuous		 1035L (244s - 2075s) GOI, 1035L (244s Bowmanton - 2075s Newell) Damper Replacements (Str's 38-389)  
ALTALINK 15-Mar-21 09:30 25-Mar-21 14:30 10.21 Days
Continuous		 17s T2 TX18477 - GOI, 17s T2 (17s Benalto) T2 A prot replacement, 289 control modifications, various alarm changes  
ATCO 15-Mar-21 12:00 22-Mar-21 15:00 7.13 Days
Continuous		 9L11, 9L11 (813s Little Smoky - 834s Wesley Creek) Pole replacement and enforcers  
EPCOR 16-Mar-21 07:00 16-Mar-21 17:00 10 Hours
Continuous		 Summerside S/S 1058L bay outage, 1058L (657s Summerside - 803s Lambton) DFR Upgrade  
ALTALINK 16-Mar-21 07:00 16-Mar-21 17:00 10 Hours
Daily		 511s T30 & SVC Plus - GOI 511s1752 wiring corrections  
EPCOR 17-Mar-21 07:00 17-Mar-21 17:00 10 Hours
Continuous		 Summerside S/S Tx1 bay outage, 657s T1 (657s Summerside) DFR Upgrade  
ALTALINK 17-Mar-21 07:00 24-Mar-21 18:00 7.46 Days
Continuous		 138s 240kV BUS 1 GOI, 138S R1 (138s Windy Flats), 138s Windy Flats 240kV Bus 1 240kV Bus #1 outage to tie-in, soak and energize new T2 Transformer  
ALTALINK, ENMAX 17-Mar-21 07:15 19-Mar-21 17:45 2.44 Days
Continuous		 771L (c47s - c162s) GOI, 771L (162s Beddington - ENMAX 47) Scope of work includes maintenance on structures 17, 19, 22, 24 and 25  
EPCOR 18-Mar-21 07:00 18-Mar-21 17:00 10 Hours
Continuous		 Summerside S/S Tx2 bay outage, 657s T2 (657s Summerside) DFR Upgrade  
ALTALINK 18-Mar-21 08:00 18-Mar-21 13:00 5 Hours
Daily		 72s952 - GOI Breaker maintenance and PRC5 (1st Trip, 1 Close, 2nd trip)  
EPCOR 22-Mar-21 07:00 26-Mar-21 17:00 4.42 Days
Continuous		 Jasper 240kV Reactor and Cap Bank @ Jasper Terminal E805S, 805s C1 (805s Jasper) Jasper 240 kV Reactor and Cap Bank Repair  
ATCO 22-Mar-21 08:00 26-Mar-21 17:00 4.38 Days
Continuous		 951S SVS Perform warranty follow up on 951S SVC.  
ATCO 22-Mar-21 09:00 25-Mar-21 16:16 3.3 Days
Continuous		 7L70, 7L70 (700s Bonnyville - 707s St.Paul) Cross arm change  
ALTALINK 22-Mar-21 09:00 25-Mar-21 19:00 3.42 Days
Continuous		 989L (77S - 310P) - GOI, 989L (77s Sagitawah - 310p Sundance) Replace 77s31 CVTs  
ENMAX 22-Mar-21 09:00 02-Apr-21 16:00 11.29 Days
Continuous		 65.2TR. 65PT138-Z32, 65.2TR (ENMAX 65) Online Monitoring Installation. 65PT138-Z32 replacement.  
ALTALINK 22-Mar-21 09:15 26-Mar-21 17:45 4.35 Days
Continuous		 1034L (244s - 324s) GOI, 1034L (244s Bowmanton - 324s Cassils) Damper Replacements (Str's 1-389)  
ALTALINK 23-Mar-21 08:00 23-Mar-21 10:30 2.5 Hours
Daily		 17s23 (17s3) - Advice Trip test 17s3 required for 17s T2 Protection upgrade  
ENMAX, ALTALINK 23-Mar-21 08:00 23-Mar-21 12:00 4 Hours
Continuous		 28.80L. 28.2TR. 28PT138-Z31, 28.80L (42s Sarcee - ENMAX 28) Spring Substation Washing  
ALTALINK 23-Mar-21 14:00 23-Mar-21 16:30 2.5 Hours
Daily		 17s34 (17s4) - Advice Trip test 17s4 required for 17s T2 Protection upgrade  
ALTALINK 24-Mar-21 08:00 24-Mar-21 10:30 2.5 Hours
Daily		 17s77 (17s13) - Advice Trip test 17s13 required for 17s T2 Protection upgrade  
BCH 24-Mar-21 08:00 24-Mar-21 20:00 12 Hours
Continuous		 2L294 (A.A. Lambert - Cranbrook) disconnect switch inspections AB-BC
ALTALINK 24-Mar-21 11:00 24-Mar-21 13:30 2.5 Hours
Daily		 17s79 C1 - Advice, 17s C1 (17s Benalto) Trip test 17s16 required for 17s T2 Protection upgrade  
ALTALINK 25-Mar-21 07:00 31-Mar-21 18:00 6.46 Days
Continuous		 942L (71s - 681s) - GOI, 942L (71s Lamoureux - 681s Bannerman) Structure Erection, conductor tie in, and OPGW installation  
ALTALINK 25-Mar-21 07:00 06-Apr-21 18:00 12.46 Days
Continuous		 997L (71s - 410s) - GOI, 997L (71s Lamoureux - 410s Josephburg) Structure Erection, conductor tie in, and OPGW installation  
ENMAX, ALTALINK 25-Mar-21 12:00 25-Mar-21 18:00 6 Hours
Continuous		 23.80L. 23.4TR, 23.80L (74s Janet - ENMAX 23) Spring Substation Washing  
ALTALINK 29-Mar-21 09:15 31-Mar-21 17:45 2.35 Days
Continuous		 170L (632s - 799s) GOI, 170L (632s Russell - 799s Coleman) Fire Mitigation; Structure Replacements Strs 48-54  
ALTALINK 29-Mar-21 09:30 08-Apr-21 14:30 10.21 Days
Continuous		 17s (903L-320p) - GOI, 903L (17s Benalto - 320p Keephills) 903L protection upgrade at 17s and 320p  
ALTALINK 30-Mar-21 07:00 30-Mar-21 18:00 11 Hours
Daily		 903L (17s - 320p) - GOI, 903L (17s Benalto - 320p Keephills) Crews performing mtce. on Structure #903L66  
ALTALINK, Lethbridge 30-Mar-21 07:00 06-Apr-21 16:30 7.4 Days
Continuous		 207L (L111s - 370s1) GOI, 207L (111s Coalbanks - 370s North Lethbridge) Replace 370s207X breaker control and protection  
ALTALINK 31-Mar-21 07:00 31-Mar-21 18:00 11 Hours
Daily		 913L (338s - 69s) - GOI, 913L (69s North Barrhead - 338s Cherhill) Crews performing mtce. on Structure #913L124  
EPCOR 05-Apr-21 07:00 05-Apr-21 17:00 10 Hours
Continuous		 240BA2 @ Argyll Transfer Station E629S and Bellamy E814S, 240BA2 (629s Argyll Transfer Station - 814s Bellamy) Doble CT/Arrestors  
ALTALINK 06-Apr-21 07:15 06-Apr-21 17:45 10.5 Hours
Daily		 901L (63s - 74s - 64s) GOI, 901L (63s Red Deer - 901AL), 901L (74s Janet - 901AL) Asset Management request for crew to hold GOI and escort Acuren to inspect welds on 901L210 and have welder on hand if needed.  
BCH 06-Apr-21 09:00 08-Apr-21 17:00 2.33 Days
Continuous		 5L52 (Custer - Ingledow) disconnect switch inspections AB-BC
EPCOR 12-Apr-21 07:00 23-Apr-21 17:00 11.42 Days
Continuous		 TX2, CD2404 Bay @ CastleDowns E557S, 557s T2 (557s Castle Downs), 557s CD2404 (557s Castle Downs) TX2 Doble, CD2404 Maintenance, CDDS7/CDDS6/CDAB2 switch maintenance  
ALTALINK 12-Apr-21 09:30 23-Apr-21 14:30 11.21 Days
Continuous		 17s (900L-63s) - GOI, 900L (17s Benalto - 63s Red Deer) 903L protection upgrade at 17s and 63s, also 17s10 C60 and syncronizer, 17s1652 syncronizer, 17s900 MOD module  
ATCO 13-Apr-21 07:00 13-Apr-21 19:00 12 Hours
Continuous		 7L101, 7L101 (790s Poplar Hill - 944s Lowe Lake) Protection Upgrade on 7L101 at 790S,
After Changes will need to operate breaker 705 a few times
 
ENMAX 19-Apr-21 08:00 30-Apr-21 16:00 11.33 Days
Continuous		 162.1TR, 162.1TR (162s Beddington) Online Monitoring Installation. Install a new tap changer controller (DEV 90) and test/commission.  
ALTALINK 19-Apr-21 12:00 23-Apr-21 19:00 4.29 Days
Continuous		 254s T1(Tx18501) & 25kV BUS 1 Advice, 254s T1 (254s Coaldale) Replacement of existing T1 transformer protections, trip and block close check to C/S 195, and initiate 96/195 protection, trip checks to breakers 152, 252 and 752, and transfer trip initiate check to INIVEN shelf for L7.  
ALTALINK, Lethbridge 20-Apr-21 07:00 20-Apr-21 14:00 7 Hours
Continuous		 725L (111s Coalbanks - 674s Lethbridge Bowron), 725AL (618s Riverbend - 725L) air break function test and maintance, air break function test and maintance
 
Lethbridge 21-Apr-21 08:00 21-Apr-21 16:00 8 Hours
Continuous		 172L (181s Chinook - 370s North Lethbridge), 463L (15s Fort Macleod - 181s Chinook) 138kv Switch maintenance  
ALTALINK 22-Apr-21 07:15 25-Apr-21 17:45 3.44 Days
Continuous		 820L (254s - 315s - 67s) GOI, 820L (67s Stirling - 820AL), 820L (254s Coaldale - 820AL), 820AL (315s Chin Chute - 820L) Scope of work includes maintenance on structures 160, 161, 168, 175, 176, 177, 179, 187, 190, 197 and 198  
ALTALINK 24-Apr-21 06:00 25-Apr-21 20:00 1.58 Days
Continuous		 38s T1, 138kv bus1, & 293s Station - GOI, 38s T1 (38s East Edmonton) Replace insulators on switches 38s31, 38s37, 38s41, 38s5, 38s72, 38s4 and a portion of 138kV Bus 1 post insulators  
ENMAX, ALTALINK 25-Apr-21 08:00 25-Apr-21 16:00 8 Hours
Continuous		 21.80L. 20.82L. 50L. 21.4TR. 21.1TR. 21.2TR. 21CAP., 21.80L (42s Sarcee - ENMAX 21), 20.82L (ENMAX 20 - ENMAX 21), 50L (44s Bearspaw Plant - ENMAX 21), 21.4TR (ENMAX 21), 21.1TR (ENMAX 21), 21.2TR (ENMAX 21), 21.1C (ENMAX 21) HV SW maint SW86  
EPCOR 26-Apr-21 07:00 30-Apr-21 17:00 4.42 Days
Continuous		 TX1 and CD2406 @ CastleDowns E557S, 557s T1 (557s Castle Downs), 557s CD2406 (557s Castle Downs) TX1 Doble, TX1 Tap Changer Maintenance, CD2406 maintenance  
ATCO 26-Apr-21 08:00 01-May-21 16:00 5.33 Days
Continuous		 766S 901T, 766s 901T (766s Nevis) Complete CT, PT, P&C cutover, commission
relays and DTT to 770S Three Hills (option 1) or 1-114S
Ghost Pine (option 2)		  
ALTALINK 26-Apr-21 10:00 26-Apr-21 12:00 2 Hours
Daily		 17s57 (17s11) - Advice Trip test 17s11 required for 900L (17s-63s Protection replacement)  
ALTALINK, EPCOR 26-Apr-21 12:00 30-Apr-21 18:00 4.25 Days
Continuous		 1045L (310p-320p-E805s) - GOI, 1045L (310p Sundance - 320p Keephills - 805s Jasper) Component Replacements 1045L Str's Range 1-175 See Also 272816 909L R/B required due to proximity.  
ALTALINK 26-Apr-21 12:30 26-Apr-21 14:30 2 Hours
Daily		 17s26 (17s6) - Advice Trip test 17s6 required for 900L (17s-63s Protection replacement)  
ALTALINK 26-Apr-21 15:00 26-Apr-21 17:00 2 Hours
Daily		 17s29 (17s7) - Advice Trip test 17s7 required for 900L (17s-63s Protection replacement)  
ALTALINK 27-Apr-21 09:00 27-Apr-21 11:00 2 Hours
Daily		 17s31 (17s1) - Advice Trip test 17s1 required for 900L (17s-63s Protection replacement)  
SUNCOR 01-May-21 08:00 08-Jul-21 18:00 68.42 Days
Continuous		 29EDD-3 & 29EDD-1, 29PL9-3 (29EDD-1 Millennium - 29EDD-3) 29EDD-3 29PT-6 LEAKS, 29EDD3; 29PL9-3 PM 5y
29EDD - 1 - 10 year PM on breakers 29EDD1S1252, 29EDD1S1352, 29EDD1S1152, 29EDD1S1452 and 29EDD-1 ;29CVT-6 SYSTEM; 5y/10y		  
EPCOR 03-May-21 07:00 07-May-21 17:00 4.42 Days
Continuous		 TX2 and C2405 @ CloverBar E987S, 987s T4 (987s Clover Bar), 987s T2 (987s Clover Bar) TX2 Doble, TX2 Zone CVT Doble, C2405 maintenance, CDS1/CDS31/CDS33/CDS34/CDS39 maintenance  
ALTALINK 03-May-21 07:30 07-May-21 16:30 4.38 Days
Continuous		 511s AC Filter Bus #1 - GOI Protection wiring Changes, Annual Filter Bank outage, AC Disconnect Maintenance  
ENMAX 03-May-21 08:00 14-May-21 16:00 11.33 Days
Continuous		 162.2TR, 162.2TR (162s Beddington) Online Monitoring Installation. Install a new tap changer controller (DEV 90) and test/commission.  
ATCO 03-May-21 08:00 17-May-21 17:00 14.38 Days
Continuous		 755S 901, 755S 901A, 755S 901PT, 755S 906, 755S 9L20 CHANNEL B TP FAIL, 755S 9L20 CHANNEL C TP FAIL, 755S 9L20 Protection Relay, 755S 9L20D1, 755S 9L20GS, 9L20 (755s Cordel - 766s Nevis) Protection upgrade to 9L20, replace 901CT at 755s Cordel.  
ALTALINK, EPCOR 03-May-21 12:00 07-May-21 18:00 4.25 Days
Continuous		 1045L (310p-320p-E805s) - GOI, 1045L (310p Sundance - 320p Keephills - 805s Jasper) Component Replacements 1045L Str's Range 1-175 See Also 272818 909L R/B required due to proximity.  
ALTALINK 04-May-21 09:30 06-May-21 14:30 2.21 Days
Continuous		 17s C1 - GOI, 17s C1 (17s Benalto) 17s16 move control, indication, various breaker and cap bank alarms  
BCH 07-May-21 09:00 07-May-21 17:00 8 Hours
Continuous		 1L274 (1D2L274 - 1D3L274) marker ball installation AB-BC
EPCOR 10-May-21 07:00 14-May-21 17:00 4.42 Days
Continuous		 C2402 @ CloverBar E987S, 987s C2402 (987s Clover Bar) C2402 maintenance and Doble  
ALTALINK, Lethbridge 10-May-21 08:00 14-May-21 16:00 4.33 Days
Continuous		 824L (593s Lethbridge Lakeview - 618s Riverbend) air break function test and maintance
 
BCH 10-May-21 09:00 13-May-21 11:00 3.08 Days
Continuous		 1L275 (799s Coleman - Natal) structure replacement  
ALTALINK, EPCOR 10-May-21 12:00 14-May-21 18:00 4.25 Days
Continuous		 1045L (310p-320p-E805s) - GOI, 1045L (310p Sundance - 320p Keephills - 805s Jasper) Component Replacements 1045L Str's Range 1-175 See Also 272820 909L R/B required due to proximity.  
EPCOR, ALTALINK 17-May-21 07:00 17-May-21 17:00 10 Hours
Continuous		 C2404 and C2406 @ Cloverbar E987S, 921L (71s Lamoureux - 987s Clover Bar) 240CVT 85/86/87 Doble  
ALTALINK, EPCOR 17-May-21 12:00 21-May-21 18:00 4.25 Days
Continuous		 1045L (310p-320p-E805s) - GOI, 1045L (310p Sundance - 320p Keephills - 805s Jasper) Component Replacements 1045L Str's Range 1-175 See Also 272822 909L R/B required due to proximity.  
EPCOR, ALTALINK 18-May-21 07:00 19-May-21 17:00 1.42 Days
Continuous		 TX1 and 1059L @ East Industrial E52S and East Edmonton 38S and Lambton E803S, 1059L (38s East Edmonton - 803s Lambton), 1059AL (52s East Industrial - 1059L), 52s T1 (52s East Industrial) TX1 Tap Changer Maintenance, 1059L CT and Arrestor Doble, EDS1 Maintenance  
EPCOR 24-May-21 07:00 28-May-21 17:00 4.42 Days
Continuous		 805 Bay @ Genesee 330P, 330P 12TC1 (330p Genesee) 805 Maintenance and CT Doble  
ATCO 25-May-21 08:00 28-May-21 17:00 3.38 Days
Continuous		 9L953 (574s Nilrem - 755s Cordel), 755S 905, 755S 905B, 755S 905PT, 755S 906, 755S 906PT, 755S 9L953 CHANNEL A TP FAIL, 755S 9L953 CHANNEL B TP FAIL, 755S 9L953 Protection Relay, 755S 9L953D1, 755S 9L953GS Protection upgrade for 9L953, 906/905 Breakers. We will need to modify the wiring on 9L953D1 during this outage and test its operation during the switching back to normal at the end of the outage.  
EPCOR 31-May-21 07:00 02-Jun-21 17:00 2.42 Days
Continuous		 1201 Bay @ Genesee 330P, 330p 1201 (330p Genesee) 1201 Maintenance and CT Doble  
EPCOR 31-May-21 07:00 11-Jun-21 17:00 11.42 Days
Continuous		 East Industrial TX2 DGA Replacement, 52s T2 (52s East Industrial) East Industrial TX2 DGA Replacement - 1007382.036969  
ATCO 31-May-21 08:00 14-Jun-21 17:00 14.38 Days
Continuous		 755S 904, 755S 904B, 755S 905, 755S 905A, 755S 905PT 9L16 Protection upgrade, update protection to 905 & 904 Breakers  
ALTALINK, Lethbridge 03-Jun-21 13:00 03-Jun-21 17:00 4 Hours
Continuous		 734L (241s Lethbridge Uplands - 370s North Lethbridge) Air break function test and maintance
 
ATCO 05-Jun-21 13:00 24-Jun-21 09:00 18.83 Days
Continuous		 730S 701T, 730S 701TCS, 730s 701T (730s Rycroft) 730S 701T TRANSFORMER CLASS2 MAJOR TESTING

Leak severity, 701T main, 701TCS main

Transformer out of service, load on 902S		  
EPCOR 07-Jun-21 07:00 07-Jun-21 17:00 10 Hours
Continuous		 RDS24, Bus 1 @ Rossdale and TX2 @ Bellamy E814S, 814s T2 (814s Bellamy) RDS24 Switch Repair, Doble Bellamy TX1 PT  
EPCOR 07-Jun-21 07:00 09-Jun-21 17:00 2.42 Days
Continuous		 1202 Bay @ Genesee 330P, 330p 1202 (330p Genesee) 1202 Maintenance and CT Doble  
ALTALINK 07-Jun-21 07:00 17-Jun-21 18:00 10.46 Days
Continuous		 1325L (510s - 511s) - GOI, 1325L (510s Sunnybrook - 511s Crossings) Semi Annual Inspection and Maintenance, Doble T11 and Valve Hall and DC yard Inspection  
EPCOR 14-Jun-21 07:00 16-Jun-21 17:00 2.42 Days
Continuous		 1203 Bay @ Genesee 330P, 330p 1203 (330p Genesee) 1203 Maintenance and Doble  
EPCOR 15-Jun-21 07:00 16-Jun-21 17:00 1.42 Days
Continuous		 TX1 @ Rossdale and TX2 @ Bellamy E814S, 814s T2 (814s Bellamy) Rossdale TX1 Tap Changer Maintenance, BDS18 Repair/Maintenance, Doble Bellamy TX2 PT  
EPCOR 21-Jun-21 07:00 23-Jun-21 17:00 2.42 Days
Continuous		 1205 Bay @ Genesee 330P, 330p 1205 (330p Genesee) 1205 Maintenance and CT Doble  
ATCO 21-Jun-21 08:10 05-Jul-21 17:10 14.38 Days
Continuous		 755S 902, 755S 902B, 755S 903, 755S 903A, 755S 903PT, 755S 9L27 CHANNEL A TP, 755S 9L27 CHANNEL B TP, 755S 9L27 Protection Relay, 755S 9L27D1, 755S 9L27GS2, 9L27 (755s Cordel - 863s Paintearth) Protection upgrade to 9L27 and breakers 902/903, Replace 903A, 9L27D1 and 903PT.  
ATCO 23-Jun-21 09:00 24-Jun-21 16:30 31.5 Hours
Continuous		 755S 901, 755S 901B, 755S 902, 755S 902A, 755S 902B, 755S 902PT, 755S 9L79 CHANNEL A TP FAIL, 755S 9L79 CHANNEL B TP FAIL, 755S 9L79 Protection Relay, 755S 9L79D2, 755S 9L79GS2, 757S 911, 757S 911PT, 9L79 (755s Cordel - 757s Battle River) Protection upgrade to 9L79 relays, testing of MODs @755s. PRC005 at the 757s Batter river end on Breaker 911  
EPCOR 24-Jun-21 07:00 25-Jun-21 17:00 1.42 Days
Continuous		 12TC2 and Bus 2 @ Genesee 330P, 330P 12TC2 (330p Genesee), 330p Genesee 500 kV Bus 2 1203A/1206A/1209B/12TC2D Switch Maintenance  
ATCO 24-Jun-21 09:00 24-Jun-21 17:00 8 Hours
Continuous		 730S 501, 730s 701T (730s Rycroft) 730S Remove U/G Cables From 501

Remove mobile sub 902S 25KV cables
701T is OOS with GOI 2-53224		  
BCH 28-Jun-21 09:00 02-Jul-21 17:00 4.33 Days
Continuous		 2L294 (A.A. Lambert - Nelway) insulator replacement AB-BC
SUNCOR 01-Jul-21 08:00 13-Jul-21 17:00 12.38 Days
Continuous		 635PL9-1000 and 635PT-1000, 635PL9-1000 (2005s Secord - 635EDD-1000) 260kV line structure change for line lift; maintenance of 260kV line, transformer, associated equipment and protection  
EPCOR, ALTALINK 05-Jul-21 07:00 05-Jul-21 17:00 10 Hours
Continuous		 1044L Zone @ Japser Terminal E805S and Petrolia E816S, 1044L (805s Jasper - 816s Petrolia) 1044L at Jasper Arrestor Doble  
ATCO 05-Jul-21 08:16 06-Jul-21 17:00 1.36 Days
Continuous		 755S 903, 755S 903B, 755S 904, 755S 904A, 755S 904PT, 755S 9L80 CHANNEL A TP FAIL, 755S 9L80 CHANNEL B TP FAIL, 755S 9L80 CHANNEL C TP FAIL, 755S 9L80 Protection Relay, 755S 9L80D2, 755S 9L80GS, 757S 912, 757S 9L80 CHANNEL A TP FAIL, 757S 9L80 CHANNEL B TP FAIL, 757S 9L80 CHANNEL C TP FAIL, 757S 9L80 Protection Relay, 757S 9L80D1, 757S 9L80PT, 9L80 (755s Cordel - 757s Battle River) Protection upgrade to 9L80, PRC005 work must be done at 757s on breaker 912 @ this time as well.  
BCH 05-Jul-21 09:00 09-Jul-21 17:00 4.33 Days
Continuous		 2L294 (A.A. Lambert - Cranbrook) disconnect switch inspections AB-BC
EPCOR, ALTALINK 06-Jul-21 07:00 06-Jul-21 17:00 10 Hours
Continuous		 1045L @ Jasper Terminal E805S, Keephills 320P, Sundance 310P, 1045L (310p Sundance - 320p Keephills - 805s Jasper) 1045L at Jasper CVT/Arrestor Doble  
SUNCOR 08-Jul-21 08:00 11-Jul-21 17:00 3.38 Days
Continuous		 635PP-1000 Bus-Side Disconnect Repairs Main Sub 635EDD-1000  
ATCO 12-Jul-21 08:00 26-Jul-21 17:00 14.38 Days
Continuous		 9L02, 9L02 (809s Louise Creek - 813s Little Smoky) Louise Creek Rebuild project
Wiring for 903/910BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF protections.		  
ATCO 12-Jul-21 09:00 16-Jul-21 16:00 4.29 Days
Continuous		 7L113, 7L113 (853s Ring Creek - 930s Arcenciel) Time Domain Line Protection Project for circuit modifications required to install new relays at Ring Creek 853S & Arcenceil 930S Substations.  
ALTALINK, Lethbridge 15-Jul-21 08:00 15-Jul-21 13:00 5 Hours
Continuous		 725L (15s Fort MacLeod - 674s Lethbridge Bowron) air break function test and maintance
 
EPCOR 19-Jul-21 07:00 23-Jul-21 17:00 4.42 Days
Continuous		 Petrolia- 1055L CVT, 1055L (629s Argyll Transfer Station - 816s Petrolia) Substation Life Cycle Replacement of HV VTs - Petrolia- 1055L CVT  
BCH 19-Jul-21 09:00 23-Jul-21 17:00 4.33 Days
Continuous		 5L91 (Ashton Creek - Selkirk) structure replacement AB-BC
SUNCOR 22-Jul-21 08:00 03-Aug-21 17:00 12.38 Days
Continuous		 635PL9-1001 and 635PT-1001, 635PL9-1001 (2005s Secord - 635EDD-1000) 260kV line structure change for line lift; maintenance of 260kV line, transformer, associated equipment and protection  
EPCOR, ALTALINK 26-Jul-21 07:00 30-Jul-21 17:00 4.42 Days
Continuous		 Dome 909L CVT Replacement, 909L (310p Sundance - 665s Dome) Dome 909LW CVT Replacement  
BCH 26-Jul-21 09:00 06-Aug-21 17:00 11.33 Days
Continuous		 5L96 (Selkirk - Vaseux Lake) marker ball installation AB-BC
SUNCOR 29-Jul-21 08:00 01-Aug-21 17:00 3.38 Days
Continuous		 635PP-1001 Bus-Side Disconnect Repairs Main Sub 635EDD-1000  
ALTALINK 06-Aug-21 07:15 11-Aug-21 17:45 5.44 Days
Continuous		 444L (217s - 198s) GOI, 444L (198s Blackfalds - 217s North Red Deer) Scope of work includes replacing structures 7, 8, 10 and 12 and maintenance on Structures 1, 2, 6 and 25  
ATCO 09-Aug-21 08:00 23-Aug-21 17:00 14.38 Days
Continuous		 9L40, 9L40 (732s Mitsue - 809s Louise Creek) Louise Creek Rebuild project
Wiring for 903/904BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF protections.		  
BCH 09-Aug-21 09:00 13-Aug-21 17:00 4.33 Days
Continuous		 5L98 (BCH Nicola - Vaseux Lake) insulator replacement AB-BC
ALTALINK 12-Aug-21 07:00 12-Aug-21 18:00 11 Hours
Daily		 787L (71s - 787L29) - GOI, 787L (71s Lamoureux - 787AL) Fire mitigation on Structure #8  
ATCO 22-Aug-21 08:00 22-Aug-21 16:00 8 Hours
Continuous		 766S 901T, 766s 901T (766s Nevis) TransAlta GARDEN PLAIN PROJECT
Complete the structural and electrical work related to protection panel, Automation & SCADA panel and telecom panels.
Complete the line work associated with Line 9LA59 which will be connected to 1045S Garden Plain substation.		  
ATCO 23-Aug-21 08:00 06-Sep-21 17:00 14.38 Days
Continuous		 9L05, 9L05 (809s Louise Creek - 813s Little Smoky) Louise Creek Rebuild project
Wiring for 904/905BF relays.
CT ratio changes.
Relay programming and functionality.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
BCH 23-Aug-21 09:00 23-Aug-21 17:00 8 Hours
Continuous		 5L94 (Cranbrook - 102s Langdon) NERC PM AB-BC
ALTALINK 23-Aug-21 09:00 27-Aug-21 18:00 4.38 Days
Continuous		 1201L (520s Bennett - BCH Cranbrook) components-structure range 383-464 AB-BC
MONTANA 23-Aug-21 09:00 27-Aug-21 18:00 4.38 Days
Continuous		 MATL (120s Picture Butte - Montana) align with 1201L outage AB-MATL
ALTALINK 30-Aug-21 09:00 03-Sep-21 18:00 4.38 Days
Continuous		 1201L (520s Bennett - BCH Cranbrook) components-structure range 383-464 AB-BC
MONTANA 30-Aug-21 09:00 03-Sep-21 18:00 4.38 Days
Continuous		 MATL (120s Picture Butte - Montana) align with 1201L outage AB-MATL
ATCO 02-Sep-21 08:00 03-Sep-21 16:00 1.33 Days
Continuous		 733S 702T, 733S 144kV Bus, 733s 702T (733s Simonette), 733s 701 (733s Simonette), 733s 702 (733s Simonette), 733s 703 (733s Simonette) 733S Simonette Expansion -Connect New Cap Bank
MD Greenview Pod		  
EPCOR 06-Sep-21 07:00 10-Sep-21 17:00 4.42 Days
Continuous		 Lambton LSD2 Substation Manual Disconnect Switches - Lambton LDS2  
ATCO 06-Sep-21 08:00 24-Sep-21 17:00 18.38 Days
Continuous		 9L939, 9L939 (77s Sagitawah - 809s Louise Creek) Louise Creek Rebuild project

Wiring for 905/906BF relays.
CT ratio changes.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ALTALINK 07-Sep-21 09:00 17-Sep-21 18:00 10.38 Days
Continuous		 1201L (520s Bennett - BCH Cranbrook) components-structure range 383-464 AB-BC
MONTANA 07-Sep-21 09:00 17-Sep-21 18:00 10.38 Days
Continuous		 MATL (120s Picture Butte - Montana) align with 1201L outage AB-MATL
EPCOR 13-Sep-21 07:00 17-Sep-21 17:00 4.42 Days
Continuous		 Lambton TX3 Outage Breaker fail cutover - 1004039.036685
Substation Manual Disconnect Switches - Lambton LDS5 - 1007183.038109		  
ATCO 13-Sep-21 08:00 20-Sep-21 16:00 7.33 Days
Continuous		 9L07, 951S 905, 951S 906, 9L07 (951s Thickwood - 2011s Dawes), 951s 905 (951s Thickwood Hills), 951s 906 (951s Thickwood Hills) Cut in CT/'PT/SCADA circuits to the new RAS relays  
EPCOR 20-Sep-21 07:00 24-Sep-21 17:00 4.42 Days
Continuous		 Lambton LDS6 Substation Manual Disconnect Switches - Lambton LDS6  
ATCO 20-Sep-21 08:00 23-Sep-21 16:00 3.33 Days
Continuous		 951S 900BS2, 951S 908, 951S 903, 951S 906 951S construction for 9L162 & 9L193 addition
AESO should be notified of any changes to below workplan:

Jan 20, 2021 – Feb 20, 2021
Isolation pts: 908B,909A
Impact: BKR 908 OOS
Scope of work: Demo bus & install 909A & 909B
Feb 21, 2021 – Feb 23, 2021
Expand to isolation pts:903B, 906B,908B
Impact: BKR 903,BKR 906, 900BS2 OOS
Scope of work: Make connections to 909A & 912A		  
ATCO 20-Sep-21 08:00 08-Nov-21 17:00 49.42 Days
Continuous		 9L938, 809S 902T, 9L938 (77s Sagitawah - 809s Louise Creek), 809s 902T (809s Louise Creek) Louise Creek Rebuild project
2021-09-24 Expand 50617A - New isolation points to be 912A, 910B, 702A, 500D3
Replace breakers' 911, 912, and 707.
Add new bus PT 700PT2.
Complete wiring for BF, 21A, 21B, and 701C relays.
CT ratio changes.
Commission apparatus.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
BCH 20-Sep-21 09:00 24-Sep-21 17:00 4.33 Days
Continuous		 5L92 (Cranbrook - Selkirk) insulator replacement AB-BC
ATCO 24-Sep-21 08:00 26-Sep-21 16:00 2.33 Days
Continuous		 951S 900BS1, 951s 1201T (951s Thickwood Hills), 951s 920C (951s Thickwood) 951S construction for 240kv expansion - 9L162 & 9L193 addition
Connect 910A to 900BS1
Impact: 900BS1 OOS, BKR 901 OOS, BKR 904 OOS, BKR 907 OOS, 920C OOS		  
BCH 27-Sep-21 09:00 08-Oct-21 17:00 11.33 Days
Continuous		 2L293 (Nelway - Selkirk) structure replacement AB-BC
ATCO 29-Sep-21 08:00 01-Oct-21 16:00 2.33 Days
Continuous		 9L59, 9L59 (801s Anderson - 972s Tinchebray) TransAlta GARDEN PLAIN PROJECT
Line 9LA59 tie-in to Garden Plain Sub		  
ATCO 29-Sep-21 08:00 01-Oct-21 16:00 2.33 Days
Continuous		 801S 903, 801S 902, 9L59, 9L59 (801s Anderson - 972s Tinchebray) TransAlta GARDEN PLAIN PROJECT
Relay Settings changes		  
ATCO 29-Sep-21 08:00 01-Oct-21 16:00 2.33 Days
Continuous		 972S 901, 972S 902, 9L59, 9L59 (801s Anderson - 972s Tinchebray) TransAlta GARDEN PLAIN PROJECT
Relay Settings Changes		  
ATCO 05-Oct-21 08:00 12-Oct-21 16:00 7.33 Days
Continuous		 12L44, 12L44 (939s Livock - 951s Thickwood Hills) Suncor Capacity increase project
Cut in new CT and PT circuit extension to the new RAS relays, T&O Line Terminal Open (LTO) on 1206, 1207, and 12L44D1 @ 939S APL Livock and 1244D1, 1205, 1206, 1201TA, and 901TA @ 951S APL Thickwood. Complete commissioning of RAS relays, end-to-end tests including output to Thickwood RAS		  
ATCO 11-Oct-21 08:00 18-Oct-21 16:00 7.33 Days
Continuous		 9L23, 848S 905, 848S 906, 9L23 (848s Ruth Lake - 977s Salt Creek), 848s 906 (848s Ruth Lake), 848s 905 (848s Ruth Lake) Cut in new CT and PT circuit extension to the new RAS relays, complete SCADA terminations  
BCH 11-Oct-21 09:00 05-Nov-21 17:00 25.33 Days
Continuous		 2L112 (Boundary - Nelway) oil containment install AB-BC
ALTALINK, Lethbridge 19-Oct-21 08:00 19-Oct-21 13:00 5 Hours
Continuous		 667L (146s Lethbridge MacDonald - 370s North Lethbridge), 146s 667 (146s Lethbridge McDonald) test trip and breaker fail trip  
ATCO 25-Oct-21 08:00 01-Nov-21 16:00 7.33 Days
Continuous		 848S 901T, 848s 901T (848s Ruth Lake) Complete cut in CT/'PT/SCADAcircuits to the new RAS relays  
BCH 25-Oct-21 09:00 25-Oct-21 17:00 8 Hours
Continuous		 2L113 (B1s Natal - B2s Cranbrook) conductor repair AB-BC
BCH 25-Oct-21 09:00 29-Oct-21 17:00 4.33 Days
Continuous		 5L51 (Custer - Ingledow) insulator replacement AB-BC
ALTALINK, Lethbridge 27-Oct-21 08:00 27-Oct-21 16:00 8 Hours
Continuous		 667L (146s Lethbridge MacDonald - 370s North Lethbridge), 813L (146s Lethbridge MacDonald - 241s Lethbridge Uplands) energize new distribution transformer  
BCH 01-Nov-21 09:00 05-Nov-21 17:00 4.33 Days
Continuous		 5L52 (Custer - Ingledow) insulator replacement AB-BC
ATCO, ALTALINK 02-Nov-21 08:00 05-Nov-21 16:00 3.33 Days
Continuous		 12L41, 12L41 (510s Sunnybrook - 939s Livock) Suncor Capacity increase Project
Cut in new CT and PT circuit extension to the new RAS relays, T&O Line Terminal Open (LTO) on 1206, 1207, and 12L41D1 @ 939S APL
Livock and @ 510S Sunnybrook (Altalink). Complete commissioning of RAS relays, end-to-end tests including output to Thickwood RAS		  
ATCO 08-Nov-21 08:00 15-Nov-21 16:00 7.33 Days
Continuous		 848S 902T, 848s 902T (848s Ruth Lake) Cut in new CT and PT circuit extension to the new RAS relays, complete SCADA terminations.  
ATCO 15-Nov-21 08:00 13-Dec-21 17:00 28.38 Days
Continuous		 809S 901T, 809s 901T (809s Louise Creek) Louise Creek Rebuild project- Replace 900PT1, CT modifications to 906CT, 912CT, and 901T  
ATCO 06-Dec-21 08:00 13-Dec-21 16:00 7.33 Days
Continuous		 9L74, 888S 905, 888S 906, 9L74 (888s Dover - 960s Birchwood Creek), 888s 905 (888s Dover), 888s 906 (888s Dover) Cut in new CT and PT circuit extension to the new RAS relays, complete SCADA terminations.  
BCH 07-Dec-21 09:00 23-Dec-21 17:00 16.33 Days
Continuous		 1L274 (B1s BCH Natal - 1D1L274) structure refurbishment AB-BC
ATCO 14-Dec-21 08:00 21-Dec-21 15:00 7.29 Days
Continuous		 7L40, 7L40 (733s Simonette - 813s Little Smoky) 53455 MD Greenview Load Project
Install and commission new 144kV switches 7L40D? and 7L40D? at T-tap location.
Connect 7L40 to 7LA40D2.		  
ATCO 17-Jan-22 08:00 24-Jan-22 16:00 7.33 Days
Continuous		 9L84, 934S 905, 934S 906, 9L84 (934s Black Fly - 977s Salt Creek), 934s 905 (934s Blackfly), 934s 906 (934s Blackfly) Cut in new CT and PT circuit extension to the new RAS relays, complete SCADA terminations.  
ATCO, CNRL 27-Jan-22 08:00 07-Feb-22 17:00 11.38 Days
Continuous		 75-PLH-902, 75-PLH-902 (838s Horizon Mining - 849s Joslyn) ATCO 9L32-9L66 CNRL- Horizon Project
Disconnect existing 75-PLH-902 from Horizon substation 75
Connect new bus Horizon substation 75 (former 75-PLH-902 bay)to new 838S-900BS1
Reroute and connect 9L137 (former 75-PLH-902) to new 838S and energize
Commission 87L/900BS1 protection, end-to-end testing
Upgrade 21B/9L137 line protection @ 849S Joslyn
Commission line protection, SCADA and end-to-end testing, BF/DTT to 838S		  
ATCO, CNRL 08-Feb-22 08:00 19-Feb-22 17:00 11.38 Days
Continuous		 75-PLH-901, 75-PLH-901 (838s Horizon Mining - 849s Joslyn) ATCO 9L32-9L66 CNRL- Horizon Project
Disconnect existing 75-PLH-901 from Horizon substation 75
Connect new bus Horizon substation 75 (former 75-PLH-901 bay) to new 838S-900BS2
Reroute and connect 9L155 (former 75-PLH-901) to new 838S and energize
Commission 87L/900BS1 protection, end-to-end testing
Upgrade 21B/9L155 line protection @ 849S Joslyn
Commission line protection, SCADA and end-to-end testing, BF/DTT to 838S		  
ATCO, ALTALINK 14-Feb-22 08:00 14-Feb-22 18:00 10 Hours
Continuous		 7L65, 7L77, 7L77 (395s North Holden - 709s Vegreville), 7L65 (709s Vegreville - 710s Vermilion) String over 7L65 and 7L77  
ATCO 20-Feb-22 08:00 23-Feb-22 17:00 3.38 Days
Continuous		 9L66, 9L66 (847s Muskeg River - 849s Joslyn Creek) ATCO 9L32-9L66 CNRL- Horizon Project
Disconnect existing line 9L66 at tap point and connect new line segment to 838S Horizon Expansion
Disconnect existing 9L66 from Joslyn 849S
Commissioning upgrade - relay settings @ 847S		  
ATCO 24-Feb-22 08:00 27-Feb-22 17:00 3.38 Days
Continuous		 9L32, 9L32 (849s Joslyn Creek - 2005s Secord) ATCO 9L32-9L66 CNRL- Horizon Project
Disconnect existing line 9L32 at tap point and connect new line segment to 838S Horizon Expansion
Disconnect existing 9L32 from Joslyn 849S
Commissioning upgrade - relay settings @ 2005S		  
ATCO 01-Mar-22 08:00 03-Mar-22 17:00 2.38 Days
Continuous		 9L46, 9L46 (932s Pemukan - 959s Lanfine) Sharp Hills Wind Farm Project
Outage for structure foundations work directly under 9L46		  
ATCO 14-Mar-22 08:00 15-Mar-22 17:00 1.38 Days
Continuous		 766S 901T, 766s 901T (766s Nevis) Sharp Hills Wind Farm Project
Installation of new RAS panel at 766S Nevis		  
ALTALINK 17-Mar-22 07:00 22-Mar-22 18:00 5.46 Days
Continuous		 1036L (356s - 554s) GOI, 1036L (356s Milo - 554s Travers) GOI Required for installation of Phase Raiser assemblies on structure 28 and 29 and Interphase spacers on spans 27 to 30.  
ATCO, ALTALINK 22-Mar-22 07:00 22-Mar-22 17:00 10 Hours
Continuous		 7L77, 7L77 (395s North Holden - 709s Vegreville) 7L65 Rebuild Project  
ATCO 09-Apr-22 08:00 15-Apr-22 17:00 6.38 Days
Continuous		 9L46, 9L46 (932s Pemukan - 959s Lanfine) Sharp Hills Wind Farm Project
Outage for Line termination to 363S Sedalia on 9L46		  
ATCO 15-Jun-22 07:00 28-Jul-22 17:00 43.42 Days
Continuous		 972S 900BS2, 9L16, 9L16 (755s Cordel - 972s Tinchebray), 972s Tinchebray 240kV Bus 900BS2 Outage on 907B and 908A for the installation and commissioning of 907 and 907CT  
ATCO 29-Jun-22 07:00 01-Jul-22 17:00 2.42 Days
Continuous		 766S 701, 766S 901T, 766s 901T (766s Nevis), 766s 701 (766s Nevis) RAS modifications for the Pattern Lanfine WAGF project  
ATCO 12-Jul-22 07:00 16-Jul-22 17:00 4.42 Days
Continuous		 7L224, 774S 701, 7L224 (650s Hansman Lake - 774s Monitor), 774s 701 (774s Monitor) RAS modifications for the Pattern Lanfine WAGF project  
ATCO 27-Jul-22 07:00 28-Jul-22 17:00 1.42 Days
Continuous		 972S 900BS2, 9L16, 9L16 (755s Cordel - 972s Tinchebray), 972s Tinchebray 240kV Bus 900BS2 Outage on 9L16 to cut the line over to the new bay  
ATCO 27-Jul-22 07:00 31-Jul-22 17:00 4.42 Days
Continuous		 7L760, 767S 702, 7L760 (767s Oyen - 7L760D2), 767s 702 (767s Oyen) RAS modifications for the Pattern Lanfine WAGF project  
ATCO 29-Jul-22 07:00 03-Aug-22 17:00 5.42 Days
Continuous		 9L177 Installing new 240Kv Bay (connect 907B to BUS 1) for 620S Goldeye substation connection  
ATCO 05-Sep-22 08:00 30-Sep-22 16:00 25.33 Days
Continuous		 972S 900BS2, 972s Tinchebray 240kV Bus 900BS2 CETO project  
ATCO 22-Oct-22 07:00 02-Nov-22 17:00 11.42 Days
Continuous		 7L129, 7L129 (710s Vermilion - 918s Bauer) Re stringing conductor  
ATCO 15-Dec-22 07:00 23-Dec-22 17:00 8.42 Days
Continuous		 730S 702, 730S 704, 730s 702 (730s Rycroft), 7L73 (730s Rycroft - 829s Boucher Creek), 730s 704 (730s Rycroft) SVC addition and 144 kv bus rebuild.  

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: 2021-01-20   2:15:42 PM


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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