Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2023-01-07

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
EPCOR 14-Nov-22 07:00 27-Jan-23 17:00 74.42 Days
Continuous		 EP 803s T3 (EP 803s Lambton), EP 803s L2403 (EP 803s Lambton), EP 803s L2405 (EP 803s Lambton), EP 803s LAB3 (EP 803s Lambton) 72LS24 protection upgrade p&c cutovers  
ALTALINK 19-Dec-22 16:01 17-Jan-23 07:59 28.67 Days
Continuous		 1080L (SS-25 - SS-65) Urgent work to replace 1080L cables into C25s  
ATCO 03-Jan-23 08:00 12-Jan-23 17:00 9.38 Days
Continuous		 7L80 (733s Simonette - 857s Kakwa Ridge), 7L80 (740s H.R. Milner - 857s Kakwa Ridge) Line mitigation, Cross arm replacement  
BCH 03-Jan-23 09:00 03-Feb-23 17:00 31.33 Days
Continuous		 1L274 (48s Pocaterra - 978s BCH Britt Creek) replace end of life structures BC maintenance does not affect the Alberta ATC AB-BC
ALTALINK 07-Jan-23 07:00 08-Jan-23 18:00 1.46 Days
Daily		 1083L (288s-63s) - GOI, 1083L (63s Red Deer - 288s Wolf Creek) Replace insulators at structures 92 & 133. See Also SAP: 28292 914L (288s-87s) RB required due to proximity  
ALTALINK 09-Jan-23 07:15 19-Jan-23 10:00 10.11 Days
Continuous		 945L (562s-275s) GOI, 945L (275s Jenner - 562s Cypress) 945L Outage for L4 ‘B’ protection upgrade. Second scope - Reconfigure relay for new TPR circuits.  
ENMAX 09-Jan-23 08:00 13-Jan-23 18:00 4.42 Days
Continuous		 162.1TR (SS-162). 240kV North Bus (SS-162). 138kV North Bus (SS-162), 162.1TR (SS-162) 162 Sub 240kV DFR Installation  
ALTALINK 09-Jan-23 09:30 09-Jan-23 18:00 8.5 Hours
Daily		 926L (17s-310p) - GOI, 926L (17s Benalto - 310p Sundance) Replace insulators on structure 464. See Also SAP:282947 995L (62s-68s-17s) - R/B Required due to proximity to 926L  
ATCO 09-Jan-23 10:00 16-Jan-23 12:00 7.08 Days
Continuous		 7L93, 7L93 (828s Sulphur Point - 930s Arcenciel) Pole Changes Line Mitigation  
ALTALINK 10-Jan-23 07:00 11-Jan-23 18:00 1.46 Days
Continuous		 836L (61s-283s) - GOI, 836L (61s Lodgepole - 283s Violet Grove) Install Bird Diverters on Crossarms at Structures 836L144, 145, 146, 147, 148, 149 & 150.  
ALTALINK, ENMAX 11-Jan-23 07:00 11-Jan-23 14:00 7 Hours
Daily		 37.82L (74s - C37s) - GOI, 37.82L (74s Janet - SS-37) Re-arranging the lightning arrestors  
ALTALINK 12-Jan-23 08:00 12-Jan-23 17:00 9 Hours
Daily		 1034L (244s - 324s) - GOI, 1034L (244s Bowmanton - 324s Cassils) Removing MVT1 on 1034L @ 244s  
EPCOR, ALTALINK 16-Jan-23 07:00 20-Jan-23 17:00 4.42 Days
Continuous		 1209L Zone @ Genesee 330P, 330p 1208 (330p Genesee), 330p 1209 (330p Genesee), 1209L (89s Ellerslie - 330p Genesee) Genesee: 1209L- P&C Relay Maintenance  
ENMAX, ALTALINK 16-Jan-23 08:00 19-Jan-23 18:00 3.42 Days
Continuous		 7.84L. 36.81L. 36.1TR. 36.3TR, 7.84L (SS-7 - SS-36), 36.81L (44s Bearspaw Plant - SS-36), 36.1TR (SS-36), 36.3TR (SS-36) HV SW Maint. SW81, SW82, SW83, SW87, SW88, SW89, SW90, MD-36.1TR, MD-36.3TR  
ENMAX 16-Jan-23 08:00 20-Jan-23 18:00 4.42 Days
Continuous		 162.2TR (SS-162). 240kV South Bus (SS-162). 138kV South Bus (SS-162), 162.2TR (SS-162) 162 Sub 240kV DFR Installation  
ATCO 16-Jan-23 08:00 25-Jan-23 17:00 9.38 Days
Continuous		 7L80, 7L80 (733s Simonette - 857s Kakwa Ridge), 7L80 (740s H.R. Milner - 857s Kakwa Ridge) Line mitigation, Cross arm replacement  
ATCO 17-Jan-23 07:30 17-Jan-23 17:30 10 Hours
Continuous		 730S 700 BUS 1, 7L73, 7L73 (730s Rycroft - 829s Boucher Creek) 700BS1 OOS to create open jumper J2.  
ALTALINK, ENMAX 17-Jan-23 08:00 25-Jan-23 16:00 8.33 Days
Continuous		 1080L (C25s- C65s)& C25s 240kV BUS GOI, 1080L (SS-25 - SS-65), 240kV North Bus (SS-25) Expansion of GOI Zone for Urgent work to replace 1080L cables into C25s for scaffolding for cable terminations  
ATCO, SHELL 18-Jan-23 07:00 18-Jan-23 17:00 10 Hours
Continuous		 847S 201-PTL260-2D1, 847S 201-PTL260-2GS1, 201-PTL260-2, 847s 201-PTL260-2D1 (847s Muskeg River) bay swap to free up the existing 9L66 bay and connect to free bay at Muskeg River Sub  
ALTALINK 18-Jan-23 08:30 19-Jan-23 17:30 1.38 Days
Continuous		 895s892 (892L) - Advice, 892L (244s Bowmanton - 895s Suffield) Migrate and commission all 895s892 (652) & L1-892L at 895s Suffield associated line protections, Overload RAS, recloser, synch check, breakers, breaker fail alarms, status, controls, metering and remote access to new RTU and LAN. Implement fault reporting on 892L.  
ATCO 20-Jan-23 07:00 20-Jan-23 17:00 10 Hours
Continuous		 847S 9L66D2, 847S 9L66GS2, 9L66 (847s Muskeg River - 849s Joslyn Creek) Connect the new relocated line 9L66 to original 847S 9L66 bay  
Syncrude 23-Jan-23 08:00 24-Jan-23 20:00 1.5 Days
Continuous		 222 (Aurora) maintenance  
ATCO 23-Jan-23 10:00 30-Jan-23 12:00 7.08 Days
Continuous		 7L93, 7L93 (828s Sulphur Point - 930s Arcenciel) Pole Changes Line Mitigation  
ALTALINK 24-Jan-23 06:30 24-Jan-23 12:00 5.5 Hours
Daily		 275s1852 GOI, 275s 1852 (275s Jenner) Remove Old TPR trip from circuit.  
ALTALINK 24-Jan-23 08:00 31-Jan-23 12:00 7.17 Days
Continuous		 275s T2(Tx18458) GOI, 275s T2 (275s Jenner) Install new reactors, re-configure buswork, install bushing monitors on T2.  
ALTALINK 24-Jan-23 12:00 24-Jan-23 17:30 5.5 Hours
Daily		 275s1952 GOI, 275s 1952 (275s Jenner) Remove Old TPR trip from circuit.  
ALTALINK 25-Jan-23 06:30 25-Jan-23 12:00 5.5 Hours
Daily		 163s1752 GOI, 163s 1752 (163s Amoco Empress) Remove Old TPR trip from circuit.  
ENMAX 25-Jan-23 08:00 25-Jan-23 12:00 4 Hours
Continuous		 65B240-D130 (SS-65) Trip Circuit Testing 65B240-D130  
ENMAX 25-Jan-23 12:00 25-Jan-23 16:00 4 Hours
Continuous		 65B240-D131 (SS-65) Trip Circuit Testing 65B240-D131  
ALTALINK 25-Jan-23 12:30 25-Jan-23 17:30 5 Hours
Daily		 163s1552 GOI, 163s 1552 (163s Amoco Empress) Remove Old TPR trip from circuit.  
ALTALINK 25-Jan-23 13:01 31-Jan-23 16:00 6.12 Days
Continuous		 1080L (C25s- C65s) GOI, 1080L (SS-25 - SS-65) Urgent work to replace 1080L cables into C25s - Taken OOS in real time on 22-10-13  
ALTALINK, ATCO 30-Jan-23 07:15 03-Feb-23 17:45 4.44 Days
Continuous		 923L(356s-A2075s) GOI, 923L (356s Milo - 2075s Newell) For 923L(Str 19-25) CRU work - Conductor replacement  
ATCO 30-Jan-23 07:30 30-Jan-23 17:30 10 Hours
Continuous		 730S 700 BUS 1, 7L73, 7L73 (730s Rycroft - 829s Boucher Creek) 700BS1 outage to remove Jumper J2.  
Syncrude 30-Jan-23 08:00 02-Feb-23 20:00 3.5 Days
Continuous		 212B (Aurora), 211 (Aurora), 213 (Aurora), D05 517 (D05), D05 519 (D05), AL-1 (Aurora - D05), 213A (Aurora), 89-215 (Aurora), D05 519B (D05), D05 517A (D05), D05 520 (D05) maintenance  
ATCO 30-Jan-23 08:00 08-Feb-23 17:00 9.38 Days
Continuous		 75-PLH-901 (838s Horizon Mining - 849s Joslyn Creek) disconnect existing 75-PLH-901 from Horizon substation 75 and connect new bus Horizon substation 75 (former 75-PLH-901 bay) to new 838S-900BS2 ATCO 9L32-9L66 CNRL- Horizon Project  
ATCO 30-Jan-23 08:00 08-Feb-23 17:00 9.38 Days
Continuous		 7L80, 7L80 (733s Simonette - 857s Kakwa Ridge), 7L80 (740s H.R. Milner - 857s Kakwa Ridge) Line mitigation, Cross arm replacement  
ATCO 30-Jan-23 11:00 06-Feb-23 10:00 6.96 Days
Continuous		 7L32, 7L32 (813s Little Smoky - 862s South Bezanson) 813S Little Smoky Rebuild
BKR 701 and 702 P&C wiring in panel 7P1, prep work
Demo panel 1G
Relay programming and functionality
Commission control, alarms and status		  
ALTALINK 31-Jan-23 07:00 03-Feb-23 18:00 3.46 Days
Continuous		 1212L (89s - 12s) - GOI, 1212L (12s Heartland - 89s Ellerslie) Component Replacements on 1212L (Structure Range 36-146)  
ALTALINK 31-Jan-23 08:00 31-Jan-23 17:00 9 Hours
Daily		 880L(321s - 523s) GOI, 880L (321s Al Rothbauer - 523s Bullshead) Implement new 'Init DDR'  
ALTALINK 01-Feb-23 08:00 01-Feb-23 17:00 9 Hours
Daily		 321s252 GOI, 321s 252 (321s Al Rothbauer) Implement new 'Init DDR' from 11(96/25SC)/252. Connect L2/252 CT from A87/138B1 to new DDR1. Implement 252 Status to new DDR1.  
ALTALINK 02-Feb-23 07:00 02-Feb-23 09:30 2.5 Hours
Daily		 275s5 GOI, 275s 5 (275s Jenner) Remove Old TPR trip from circuit.  
ALTALINK 02-Feb-23 08:00 02-Feb-23 17:00 9 Hours
Daily		 675L(321s - 244s) GOI, 675L (244s Bowmanton - 321s Al Rothbauer) Implement new 'Init DDR'  
ALTALINK 02-Feb-23 09:30 02-Feb-23 12:00 2.5 Hours
Daily		 275s2 GOI, 275s 2 (275s Jenner) Remove Old TPR trip from circuit.  
ALTALINK 02-Feb-23 12:30 02-Feb-23 15:00 2.5 Hours
Daily		 132s51 GOI, 132s 51 (132s Ware Junction) Remove Old TPR trip from circuit.  
ALTALINK 02-Feb-23 15:00 02-Feb-23 17:30 2.5 Hours
Daily		 132s47 GOI, 132s 47 (132s Ware Junction) Remove Old TPR trip from circuit.  
ALTALINK, ATCO 06-Feb-23 07:15 16-Feb-23 17:45 10.44 Days
Continuous		 923L(356s-A2075s) GOI, 923L (356s Milo - 2075s Newell) For 923L(Str 19-25) CRU work - Conduct replacement  
ALTALINK, TRANSALTA 06-Feb-23 09:30 07-Feb-23 10:30 25 Hours
Continuous		 59s T1(TX18184) GOI, 59s T1 (59s Peigan) Correct deficiencies  
ATCO 06-Feb-23 10:00 13-Feb-23 12:00 7.08 Days
Continuous		 7L93, 7L93 (828s Sulphur Point - 930s Arcenciel) Pole Changes Line Mitigation  
ALTALINK 09-Feb-23 07:00 17-Feb-23 18:00 8.46 Days
Continuous		 1206L (89s - 12s) - GOI, 1206L (12s Heartland - 89s Ellerslie) Component Replacements on 1206L (Structure Range 2-144)  
CNRL 13-Feb-23 08:00 22-Feb-23 17:00 9.38 Days
Continuous		 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 13-Feb-23 08:00 22-Feb-23 17:00 9.38 Days
Continuous		 7L80, 7L80 (733s Simonette - 857s Kakwa Ridge), 7L80 (740s H.R. Milner - 857s Kakwa Ridge) Line mitigation, Cross arm replacement  
ATCO 13-Feb-23 09:00 22-Feb-23 16:00 9.29 Days
Continuous		 7L59, 7L59 (789s Keg River - 7L59 tap) Changing rotten cross arms  
ENMAX, ALTALINK 15-Feb-23 08:00 16-Feb-23 18:00 1.42 Days
Continuous		 1080L, 1080L (SS-25 - SS-65) HV SW Maint. SW133, SW134, MD-1080  
ALTALINK 17-Feb-23 07:00 10-Mar-23 18:00 21.46 Days
Continuous		 926L (17s-310p) - GOI, 926L (17s Benalto - 310p Sundance) GOI is required for the new line location of 926L. Crews will be working between 926L structure 8-13 and will install new towers and conductor and complete the cut over from old alignment to new alignment.  
ALTALINK 20-Feb-23 07:15 23-Feb-23 17:45 3.44 Days
Continuous		 50L(44s- C21s) GOI, 50L (44s Bearspaw Plant - SS-21) 50L FRM (STR 115-125) - Insulator & Structure repair  
ENMAX, ALTALINK 21-Feb-23 08:00 22-Feb-23 18:00 1.42 Days
Continuous		 1109L, 1109L (SS-25 - SS-65) HV SW Maint. SW139, SW140, MD-1109  
ENMAX, ALTALINK 23-Feb-23 08:00 24-Feb-23 18:00 1.42 Days
Continuous		 1106L, 1106L (237s Foothills - SS-65) HV SW Maint. SW131, SW132, MD-1106  
ALTALINK 27-Feb-23 07:15 02-Mar-23 17:45 3.44 Days
Continuous		 50L(44s- C21s) GOI, 50L (44s Bearspaw Plant - SS-21) 50L FRM (STR 115-125) - Insulator & Structure repair  
ENMAX, ALTALINK 27-Feb-23 08:00 28-Feb-23 18:00 1.42 Days
Continuous		 1107L, 1107L (237s Foothills - SS-65) HV SW Maint. SW137, SW138, MD-1107  
ATCO 27-Feb-23 08:00 03-Mar-23 17:00 4.38 Days
Continuous		 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 27-Feb-23 08:00 08-Mar-23 17:00 9.38 Days
Continuous		 7L80, 7L80 (733s Simonette - 857s Kakwa Ridge), 7L80 (740s H.R. Milner - 857s Kakwa Ridge) Line mitigation, Cross arm replacement  
ATCO 27-Feb-23 09:00 08-Mar-23 16:00 9.29 Days
Continuous		 7L59 (786s High Level - 7L59 tap), 7L59 Changing rotten cross arms  
ALTALINK 28-Feb-23 07:15 01-Mar-23 17:45 1.44 Days
Continuous		 691L (74s - 419s) GOI, 691L (74s Janet - 419s Chestermere) FRM Component Replacement (str 2-4)  
ENMAX 01-Mar-23 08:00 03-Mar-23 18:00 2.42 Days
Continuous		 65.1TR, 65.1TR (SS-65) HV SW Maint. SW130, SW136, SW88, SW80, SW81, SW83, MD138-65.1TR, MD240-65.1TR  
ATCO 02-Mar-23 13:00 02-Mar-23 14:00 60 Mins
Continuous		 800S 701, 7L75, 7L75 (ATC 793s West Peace River - 800s Friedenstal) Testing 730S SVS reaction to loss of 7L75  
ATCO 02-Mar-23 14:01 02-Mar-23 15:00 59 Mins
Continuous		 730S 704, 7L68, 7L68 (730s Rycroft - 811s Clairmont Lake) Testing 730S SVS reaction to loss of 7L68  
EPCOR 06-Mar-23 07:00 06-Mar-23 17:00 10 Hours
Continuous		 1098L Jasper Zone @ Jasper Terminal E805S and Poundmaker, 1098L (EP 805s Jasper - Poundmaker) Jasper: JDS1 Disconnect Maintenance  
ENMAX 06-Mar-23 08:00 08-Mar-23 18:00 2.42 Days
Continuous		 65.2TR, 65.2TR (SS-65) HV SW Maint. SW141, SW135, SW86, SW93, SW87, MD138-65.2TR, MD240-65.2TR  
EPCOR 07-Mar-23 07:00 07-Mar-23 17:00 10 Hours
Continuous		 1098L Jasper Zone @ Jasper Terminal E805S and Poundmaker, 1098L (EP 805s Jasper - Poundmaker) Jasper: JDS1 Disconnect Maintenance  
ENMAX, ALTALINK 11-Mar-23 08:00 12-Mar-23 18:00 1.38 Days
Continuous		 771L, 771L (SS-47 - SS-162) HV SW Maint. SW81, SW86  
EPCOR, ALTALINK 13-Mar-23 07:00 17-Mar-23 17:00 4.42 Days
Continuous		 1164L, 1044L, TX2 @ Petrolia E816S, Riverview, Jasper Terminal E805S, 1164L (816s Petrolia - EP Riverview), 1044L (EP 805s Jasper - 816s Petrolia), 816s T2 (816s Petrolia) Petrolia: Apparatus- PDS10 LCR, 1164L LCR.
Aerial- 1164L Insulator Replacement		  
ATCO 13-Mar-23 08:00 22-Mar-23 17:00 9.38 Days
Continuous		 7L80, 7L80 (733s Simonette - 857s Kakwa Ridge), 7L80 (740s H.R. Milner - 857s Kakwa Ridge) Line mitigation, Cross arm replacement  
ATCO 13-Mar-23 09:00 22-Mar-23 16:00 9.29 Days
Continuous		 7L59, 7L59 (786s High Level - 7L59 tap) Changing rotten cross arms  
ALTALINK 17-Mar-23 07:00 07-Apr-23 18:00 21.46 Days
Continuous		 922L (17s-310p) - GOI, 922L (17s Benalto - 310p Sundance) GOI is required for the new line location of 922L. Crews will be working between 922L structure 8-13 and will install new towers and conductor and complete the cut over from old alignment to new alignment.  
CNRL 17-Mar-23 08:00 22-Mar-23 17:00 5.38 Days
Continuous		 75-PLH-902 (838s Horizon Mining - 849s Joslyn) ATCO 9L32-9L66 CNRL- Horizon Project
Protection Work		  
ALTALINK 20-Mar-23 07:15 23-Mar-23 17:45 3.44 Days
Continuous		 172L (83s - 172L944A) GOI, 172L (83s Taber - 172EL tap) FRM Component Replacement (str827)  
EPCOR, ALTALINK 20-Mar-23 09:30 31-Mar-23 17:00 11.31 Days
Continuous		 PDS1, PDS11, PDS13, PDS16, (908L, 1055L) @ Petrolia E816S and Argyll Transfer Station E629S and Ellerslie 89S, 908L (89s Ellerslie - 816s Petrolia), 1055L (629s Argyll Transfer Station - 816s Petrolia) Petrolia PDS1, PDS11, PDS13, PDS16 LCR  
ATCO 20-Mar-23 10:00 31-Mar-23 17:30 11.31 Days
Continuous		 951S 910, 951S 911 Outage to 9L162 bay, to bring in the new line and OPGW to 951s  
ATCO 20-Mar-23 10:00 31-Mar-23 17:30 11.31 Days
Continuous		 951S 908, 951S 909, 951s 908 (951s Thickwood Hills) Outage to 9L193 bay, to bring in the new line and OPGW to 951s  
ATCO 23-Mar-23 08:00 28-Mar-23 17:00 5.38 Days
Continuous		 75-PLH-901 (838s Horizon Mining - 849s Joslyn Creek) ATCO 9L32-9L66 CNRL- Horizon Project
Protection Work		  
ATCO 27-Mar-23 08:00 30-Mar-23 17:00 3.38 Days
Continuous		 7L80, 7L80 (733s Simonette - 857s Kakwa Ridge), 7L80 (740s H.R. Milner - 857s Kakwa Ridge) Line mitigation, Cross arm replacement  
EPCOR, ALTALINK 27-Mar-23 09:30 31-Mar-23 17:00 4.31 Days
Continuous		 D2403 (909LW) @ Dome E665S, 665s D2403 (665s Dome), 909L (310p Sundance - 665s Dome) Dome: D2403 Breaker Maintenance and DDS7 Disconnect Maintenance  
ATCO 27-Mar-23 10:00 03-Apr-23 17:00 7.29 Days
Continuous		 7L54, 7L54 (794s Valleyview - 813s Little Smoky) 813S Little Smoky Rebuild813S Little Smoky Rebuild
BKR 703 and 704 P&C wiring, remove old panel 7G, set up new panel 7P4, prep work
Relay programming and functionality
Commission control, alarms and status		  
EPCOR, ALTALINK 03-Apr-23 09:30 06-Apr-23 17:00 3.31 Days
Continuous		 1056L and 240BA2 @ Bellamy E814S and Petrolia E816S and Argyll Transfer Station E629S and Ellerslie 89S, 1056L (89s Ellerslie - 629s Argyll Transfer Station), 240BA2 (629s Argyll Transfer Station - 814s Bellamy) Argyll: 240BA2 Surge Arrestor LCR and ADS1 Disconnect Maintenance  
EPCOR, ALTALINK 11-Apr-23 07:00 14-Apr-23 17:00 3.42 Days
Continuous		 Genesee S/S 430L Bay Isolation, 430L (330P Genesee - 510S Sunnybrook) 1.138kv 430L1 & L2 foundation installation
2. 138kv 12TC2L2 foundation installation		  
EPCOR, ALTALINK 11-Apr-23 09:30 13-Apr-23 17:00 2.31 Days
Continuous		 1045L @ Jasper Terminal E805S and Sundance 310P and Keephills 320P, 1045L (EP 805s Jasper - 1045AL tap) Jasper: 1045L Surge Arrestor LCR  
EPCOR, ALTALINK 11-Apr-23 09:30 13-Apr-23 17:00 2.31 Days
Continuous		 1238L Zone @ Genesee 330P, 1238L (330p Genesee - 510s Sunnybrook) Genesee: 1238L Zone CVT(1201)/Arrestor(1201) Doble  
ATCO 12-Apr-23 07:00 13-Apr-23 07:00 24 Hours
Continuous		 7L35 (859s Primrose - 7L35 tap) pole replacements  
ALTALINK 12-Apr-23 09:00 13-Apr-23 16:00 31 Hours
Continuous		 410s T2 TX18133 - GOI, 410s T2 (410s Josephburg) Transformer maintenance.  
EPCOR, ALTALINK 17-Apr-23 07:00 21-Apr-23 17:00 4.42 Days
Continuous		 1055L and 240BA3 @ Petrolia E816S and Argyll Transfer Station E629S, 1055L (629s Argyll Transfer Station - 816s Petrolia), 240BA3 (629s Argyll Transfer Station - 814s Bellamy) Argyll ADS2 Disconnect Maintenance, 240BA3 CT/Arrestor Doble and Petrolia 1055L CT/CVT/Arrestor Doble  
EPCOR 17-Apr-23 07:00 21-Apr-23 17:00 4.42 Days
Continuous		 TX4 @ Cloverbar E987S, 987s T4 (987s Clover Bar) Cloverbar: TX4 Doble  
ALTALINK 17-Apr-23 08:00 23-Apr-23 17:00 6.38 Days
Continuous		 158s T2 & 25kV Bus - GOI, 158s 138kV Bus (158s Vauxhall) 138kv Bushing Replacement  
ATCO 17-Apr-23 10:30 30-Apr-23 17:00 13.27 Days
Continuous		 849S 9L08 Protection Relay, 9L08, 849S 905, 849S 906, 9L08 (849s Joslyn Creek - 888s Dover) 849s 9L08 Protection upgrades,
Demo old 75-PLH-902 protection
900BS2 updates		  
EPCOR 24-Apr-23 07:00 26-Apr-23 17:00 2.42 Days
Continuous		 TX1 @ Dome E665S, 665s T1 (665s Dome) Dome: TX1 Surge Arrestor LCR  
EPCOR 24-Apr-23 07:00 29-Apr-23 17:00 5.42 Days
Continuous		 TX3 Zone @ Jasper Terminal E805S, 805s T3 (805s Jasper) Jasper: TX3/CVT/Arrestor Doble and JAB3/JDS9/JDS8/ Disconnect Maintenance  
ATCO, ALBIAN 24-Apr-23 10:00 26-Apr-23 17:30 2.31 Days
Continuous		 920S 902T, 920s 902T (920s Jackpine) Leak mitigation on 902T  
ATCO 24-Apr-23 10:00 08-May-23 10:00 14 Days
Continuous		 7L40, 7L40 (733s Simonette - 813s Little Smoky) 813S Little Smoky Rebuild
Complete 7L40 wiring panel 7P5, 709, 710 CT/PT/P&C
wiring. Demo existing wiring/cabling, remove old
panel 4G
Relay programming and functionality
Commission control, alarms and status		  
ATCO 24-Apr-23 12:00 29-Apr-23 17:30 5.23 Days
Continuous		 7L45, 7L45 (798s Bridge Creek - 813s Little Smoky) 7L45D2 switch replacement
7L45 between 845S Big Mountain and 798S Bridge Creek to remain in service		  
ALTALINK 25-Apr-23 08:00 25-Apr-23 16:30 8.5 Hours
Daily		 338s552 - GOI, 338s 552 (338s Cherhill) Doble 3 CT's and take oil samples on 338s552 CT's (CT5)  
EPCOR 01-May-23 07:00 05-May-23 17:00 4.42 Days
Continuous		 TX3 @ Cloverbar E987S, 987s T3 (987s Clover Bar) Cloverbar: TX3 Doble  
EPCOR 01-May-23 07:00 06-May-23 17:00 5.42 Days
Continuous		 J2408 (J240C1) @ Jasper Terminal E805S, EP 805s J2408 (EP 805s Jasper), 805s C1 (805s Jasper) Jasper: J2408 Breaker Maintenance and CT/CVT/PT/Arrestor Doble and JDS13GS Disconnect Maintenance  
ALTALINK 01-May-23 07:15 04-May-23 17:45 3.44 Days
Continuous		 616L (59s - 383s - 103s) GOI, 616L (59s Peigan - 616AL tap), 616L (103s Goose Lake - 616AL tap), 616AL (383s Kettles Hill Windfarm - 616L tap) FRM Component Replacement (str 53-178)  
SUNCOR 01-May-23 08:00 14-May-23 18:00 13.42 Days
Continuous		 29EDD-1, 29EDD-1 Millennium, 29EDD-1 260kV North Bus 2 (29EDD-1 Millennium) N260B1 + Relays, 29CVT-11, 29PS-72/76.
29EDD-1S1/1S7/1S13/1S452/1S152 + Relays,
952-101/104 + Controller + Relays		  
SUNCOR 01-May-23 08:00 30-May-23 18:00 29.42 Days
Continuous		 29EDD-94, 29EDD-94 Voyageur 29EDD94; breaker maintenance & test  
ATCO 01-May-23 09:00 02-Jun-23 17:30 32.35 Days
Continuous		 13L50 (DC LINK), 13L50 (2029s Heathfield - 2075s Newell) HMI IT Upgrades AT 2075s & 2029s.

2029s & 2075s DC Maintenance.		  
ATCO 01-May-23 09:30 15-May-23 17:00 14.31 Days
Continuous		 888S 9L09 Protection Relay, 9L09, 849S 902, 849S 903, 9L09 (849s Joslyn Creek - 888s Dover) 849s 9L09 Protection upgrades,
Demo old 75-PLH-902 protection
900BS2 updates		  
ALTALINK 01-May-23 12:30 04-May-23 17:30 3.21 Days
Continuous		 310p952 - GOI, 310p 952 (310p Sundance) Maintenance on 310p952 including 1st trips  
CNRL, ATCO 01-May-23 22:00 31-May-23 22:00 30 Days
Continuous		 859s 701T (859s Primrose), 859s 701 (859s Primrose), 859s 704 (859s Primrose), 859s 701TD (859s Primrose) maintenance  
Lethbridge, ALTALINK 07-May-23 08:00 07-May-23 17:00 9 Hours
Continuous		 667L (146s), 667L (146s MacDonald - 370s North Lethbridge) OPEN END TO INSTALL NEW PROTECTIONS ,TEST/TRIP 146S667L BREAKER  
EPCOR 08-May-23 07:00 26-May-23 17:00 18.42 Days
Continuous		 TX3 @ Lambton E803S, EP 803s T3 (EP 803s Lambton) Lambton: TX3 72kV Bushing LCR  
ATCO 08-May-23 10:00 26-May-23 10:00 18 Days
Continuous		 7L45, 7L45 (798s Bridge Creek - 813s Little Smoky) 813S Little Smoky Rebuild813S Little Smoky Rebuild
BKR 703 and 704 P&C wiring, remove old panel 7G, set up new panel 7P4, prep work
Relay programming and functionality
Commission control, alarms and status		  
ALTALINK 08-May-23 12:30 11-May-23 17:30 3.21 Days
Continuous		 310p1252 - GOI, 310p 1252 (310p Sundance) Maintenance on 310p1252 including 1st trips  
ALTALINK 08-May-23 13:00 11-May-23 17:00 3.17 Days
Continuous		 338s T1 - GOI, 338s T1 (338s Cherhill) Transformer maintenance.  
SUNCOR 11-May-23 08:00 12-May-23 17:00 1.38 Days
Continuous		 635PT-1001, 635EDD-1000 635-952-635PT-1001 (635EDD-1000) Planned Repair on Transformer 2ndary Side Breaker Mech Heaters  
ATCO, ALTALINK 13-May-23 08:00 24-May-23 17:00 11.38 Days
Continuous		 7L129, 7L129 (526s Buffalo Creek - 7LA129 tap) 7L65 Rebuild. Installing new 7L129 structures, re stringing conductor  
EPCOR 15-May-23 07:00 20-May-23 17:00 5.42 Days
Continuous		 CD2405 @ Casltledowns E557S, 557s CD2405 (557s Castle Downs) Castledowns: CD2405 Breaker Maintenance and CT Doble  
ATCO 15-May-23 09:30 29-May-23 17:00 14.31 Days
Continuous		 849S 901T, 849s 901T (849s Joslyn Creek) 849s 901T Protection upgrades, 900BS1 updates
Demo old 75-PLH-901 protection		  
EPCOR, ALTALINK 23-May-23 07:00 26-May-23 17:00 3.42 Days
Continuous		 908L Zone @ Petrolia E816S and Ellerslie 89S, 908L (89s Ellerslie - 816s Petrolia) Petrolia: 908LE Zone CVT/CT/Arrestor Doble  
EPCOR 23-May-23 07:00 02-Jun-23 17:00 10.42 Days
Continuous		 TX2 Zone @ Bellamy E814S, 814s T2 (814s Bellamy) Bellamy: Apparatus First Week- TX2 Doble and Arrestor/PT Doble, P&C Second Week- Bellamy TX2 Zone P&C Maintenance  
SUNCOR 23-May-23 08:00 12-Jun-23 18:00 20.42 Days
Continuous		 29EDD-63, 29PL7-2 (29EDD-18 Firebag - 29EDD-63), 29EDD-63 29PT-179 (29EDD-63 Firebag Co-Gen), 29EDD-63 30-252-11301 (29EDD-63)
(29PT-179, 30PT-219, 30-252-11301)		  
EPCOR 29-May-23 07:00 30-May-23 17:00 1.42 Days
Continuous		 P2403 @ Petrolia E816S, PM2403 (Poundmaker) Petrolia: P2403 CT Doble  
EPCOR, ALTALINK 29-May-23 09:30 09-Jun-23 17:00 11.31 Days
Continuous		 920LW Zone @ Castledowns E557S and North Calder 37S, 920L (37s North Calder - 557s Castle Downs) Castledowns: CD2403/CD2401 Breaker Maintenance and 920LW CVT/Arrestor/CT Doble and CDDS2/CDDS3/CDDS12 Disconnect Maintenance  
ATCO 29-May-23 10:00 08-Jun-23 10:00 10 Days
Continuous		 813S 706, 813S 712, 813S SVC, 813s SVC (813s Little Smoky) Protection cutover for 5&7 harmonic relays for SVC

Wiring in 703T CT circuit		  
EPCOR 31-May-23 07:00 02-Jun-23 17:00 2.42 Days
Continuous		 1164L @ Petrolia E816S and Riverview, 1164L (816s Petrolia - EP Riverview) Petrolia: 1164L CT/Arrestor Doble and PDS12 Disconnect Maintenance  
EPCOR, ALTALINK 04-Jun-23 07:00 04-Jun-23 17:00 10 Hours
Continuous		 1056L @ Argyll Transfer Station E629S and Ellerslie 89S, 1056L (89s Ellerslie - 629s Argyll Transfer Station) 1056L: Aerial- Washing Program (Spring)  
EPCOR 05-Jun-23 07:00 14-Jun-23 17:00 9.42 Days
Continuous		 TX1 @ Bellamy E814S, 814s T1 (814s Bellamy) Bellamy: Apparatus First Week- TX1 Doble and Arrestor/PT Doble, P&C Second Week- TX1 Zone P&C Maintenance  
SUNCOR 07-Jun-23 08:00 23-Jun-23 18:00 16.42 Days
Continuous		 29EDD-71 29PT-234 (29EDD-71), 29EDD-71 752-4621 (29EDD-71), 29EDD-71 752-4622 (29EDD-71) 29EDD71;144KV NODE,29PT-239 MAINT;PM 5y
29EDD71;29PT-234 & 30PD-16 MAINT;PM 5y
29EDD-71,29PS-0239; REPLACE SWITCH
29PL7-4, 29PS-243 DIFFICULT OPERATION
29EDD-71,29PS-0239; REPLACE SWITCH		  
ALTALINK 12-Jun-23 13:00 15-Jun-23 17:00 3.17 Days
Continuous		 89s952 - GOI, 89s 952 (89s Ellerslie) 1st trip & PRC5 full maintenance  
ATCO 19-Jun-23 08:00 10-Jul-23 17:00 21.38 Days
Continuous		 7L587, 7L587 (822s Wolf Lake - 826s Marguerite Lake) 822S Wolf lake P&C and SCADA Upgrade
Work on Breaker 822S 701
Cut over cabling and protection to new panel
Commission new protection including teleprotection DTT to 826S		  
EPCOR, ALTALINK 19-Jun-23 09:30 24-Jun-23 17:00 5.31 Days
Continuous		 1059L (TX1 East Ind) @ Lambton E803S and East Industrial E52S, 1059AL (52s East Industrial - 1059L tap), 1059L (EP 803s Lambton - 1059AL tap) Lambton: 1059L CT/Arrestor Doble and LDS1/LDS8 Disconnect Maintenance, and East Industrial: E2401 Breaker Maintenance and CVT Doble  
ATCO 19-Jun-23 10:00 26-Jun-23 17:00 7.29 Days
Continuous		 9L16, 9L16 (755s Cordel - 972s Tinchebray) Upgrade 21A/B-9L16 protection relay wiring/programming and commission LTO/DTT  
EPCOR 26-Jun-23 07:00 28-Jun-23 17:00 2.42 Days
Continuous		 P2402 @ Petrolia E816S, PM2402 (Poundmaker) Petrolia: P2402 CT Doble  
EPCOR 26-Jun-23 07:00 28-Jun-23 17:00 2.42 Days
Continuous		 SU2404 @ Summerside E657S, 657s SU2404 (657s Summerside) Summerside: SU2404 Breaker Maintenance and CT Doble  
ATCO 26-Jun-23 13:00 03-Jul-23 17:00 7.17 Days
Continuous		 766S 144KV Bus, 766S 240KV Bus, 766s Nevis 766S Nevis Rebuild Project - Upgrade bus to bundled 477, connect new 704A, P&C wiring and commissioning,  
EPCOR 04-Jul-23 07:00 06-Jul-23 17:00 2.42 Days
Continuous		 SU2403 @ Summerside E657S, 657s SU2403 (657s Summerside) Summerside: Summerside SU2403 Breaker Maintenance and CT Doble  
EPCOR 10-Jul-23 07:00 15-Jul-23 17:00 5.42 Days
Continuous		 1058L @ Lambton E803S and Summerside E657S, 1058L (657s Summerside - EP 803s Lambton) Lambton: 1058L CVT/CT/Arrestor Doble and L2403 Breaker Maintenance and CT Doble  
EPCOR 17-Jul-23 07:00 19-Jul-23 17:00 2.42 Days
Continuous		 SU2402 @ Summerside E657S, 657s SU2402 (657s Summerside) Summerside: SU2402 Breaker Maintenance and CT Doble  
ATCO 17-Jul-23 08:00 07-Aug-23 17:00 21.38 Days
Continuous		 7L574, 7L574 (822s Wolf Lake - 7L574 tap) 822S Wolf lake P&C and SCADA Upgrade
Work on Breaker 822S 702
Cut over cabling and protection to new panel
Line crew prep 7L86/7L574 bypass and connect to 7L574
Commission new protection including teleprotection DTT from 970S Bourque to 822S, install temp relay settings for 7L574/7L86 bypass		  
ATCO 17-Jul-23 10:00 22-Jul-23 17:00 5.29 Days
Continuous		 9L93, 9L93 (615s Halkirk - 972s Tinchebray) Connect new 9LA93 T-tap. Cut in, reroute, restring, and splice OPGW from Str#60 to 615S Halkirk. Complete cutover and commission Protection/SCADA/Telecom at new 973S Lanes Lake, 972S, 615S Halkirk  
EPCOR 24-Jul-23 07:00 26-Jul-23 17:00 2.42 Days
Continuous		 SU2401 @ Summerside E657S, 657s SU2401 (657s Summerside) Summerside: SU2401 Breaker Maintenance and CT Doble  
EPCOR 27-Jul-23 07:00 27-Jul-23 17:00 10 Hours
Continuous		 TX2 Zone @ Poundmaker, T2 (Poundmaker), PM2401 (Poundmaker), PM2405 (Poundmaker) Poundmaker: TX2 Zone CVT Doble  
EPCOR, ALTALINK 31-Jul-23 09:30 04-Aug-23 17:00 4.31 Days
Continuous		 930L @ Poundmaker and North Calder 37S, 930L (37s North Calder - Poundmaker) 930L: Aerial- Broken Insulator Replacement and Marker Cones Upgrade  
ATCO 07-Aug-23 09:00 25-Aug-23 17:30 18.35 Days
Continuous		 13L50 (DC LINK), 13L50 (2029s Heathfield - 2075s Newell) Annual EATL O&M outage AT 2075s & 2029s

USE 2-68038 FOR 13L50 GOI
USE 2-68039 FOR 2029s GOI
USE 2-68040 FOR 2075s GOI		  
ATCO 07-Aug-23 13:00 07-Aug-23 17:00 4 Hours
Continuous		 7L86 (822s Wolf Lake - 1200s Foster Creek), 7L86 822S Wolf lake P&C and SCADA Upgrade
Line crew connect bypass to 7L86
1200S Foster Creek Sub OOS		  
ATCO 14-Aug-23 08:00 04-Sep-23 17:00 21.38 Days
Continuous		 822s 703 (822s Wolf Lake), 7L86 (822s Wolf Lake - 1200s Foster Creek) 822S Wolf lake P&C and SCADA Upgrade
Work on Breaker 822S 703
Cut over cabling and protection to new panel.
Commission new protection including teleprotection DTT.
7L86/7L574 bypass will be in service		  
ATCO 14-Aug-23 11:00 25-Sep-23 14:00 42.13 Days
Continuous		 863S 902T, 863S 500MT1, 863S 500PT3, 863S 505, 863S 506, 863s 902T (863s Paintearth) 863S Paintearth Protection Upgrade
Demo wiring from 505, 506 breakers, and 500PT3, run new wiring, terminate to 505, 506, and 500PT3, demo old 5L470 & 5L469 line protection panel, install new 5L470 & 5L469 line protection panel, wire and commission breakers, 500PT3, and line protection.
Demo old wiring, and old Transformer protection panel, install and terminate new wiring, and new Transformer protection panel. Commission new wiring/Transformer protection, and new Transformer protection panel.

Once GOI is released 902TD will need to be commissioned.		  
ATCO, IMPERIALOIL 23-Aug-23 08:00 30-Sep-23 18:00 38.42 Days
Continuous		 7L105 (837s Mahihkan - 909s Mahno), 7L161 (909s Mahno - 942s Nabiye), 909s 52A3 (909s MAHNO), 909s TNS-A1 (909s Mahno), 909s TNS-A2 (909s Mahno) maintenance  
EPCOR, ALTALINK 27-Aug-23 07:00 10-Sep-23 17:00 14.42 Days
Continuous		 Genesee S/S 430L Bay Isolation, 430L (330P Genesee - 510S Sunnybrook) 1.String BB2L , BB2L1 to BB2L2 & 12TC2L , 12TC2L1 to 12TC2L3
2. String BB2L , BB2L1 to BB2L2 & 12TC2L , 12TC2L1 to 12TC2L3		  
ATCO, IMPERIALOIL 28-Aug-23 09:00 28-Aug-23 13:00 4 Hours
Continuous		 837S 702, 837S 7L105 Protection Relay, 7L105, 837s 702 (837s Mahihkan), 7L105 (837s Mahihkan - 909s Mahno) RTXP switch replacements for 7L105  
ATCO 29-Aug-23 10:00 29-Aug-23 17:00 7 Hours
Continuous		 9L20, 9L912, 9L20 (755s Cordel - 766s Nevis), 9L912 (63s Red Deer - 766s Nevis) 766S Nevis Rebuild Project - Hot Line crew connect 9L20/9L912 bypass, cut in open Jumper J1 and J2  
ATCO 29-Aug-23 10:00 15-Nov-23 17:00 78.33 Days
Continuous		 766S 144KV Bus, 766S 240KV Bus, 766s Nevis 766S Nevis Rebuild Project - Replace and commission 9L912D1, 9L20D2, 901, 902, 901CT, 902CT, 901A, 902A, 900PT1, connect new bus section  
ATCO 04-Sep-23 13:00 04-Sep-23 17:00 4 Hours
Continuous		 7L86, 7L574, 7L574 (822s Wolf Lake - 7L574 tap) 822S Wolf lake P&C and SCADA Upgrade
Line crew to disconnect 7L574/7L86 bypass
1200S Foster Creek Sub OOS		  
EPCOR 11-Sep-23 07:00 11-Sep-23 17:00 10 Hours
Continuous		 VDS20 @ Victoria E511S, EP 511s VDS20 (EP 511s Victoria), EP 511s V2401 (EP 511s Victoria), EP 511s Victoria T5 (EP 511s Victoria) Victoria: VDS20 Disconnect Repair  
EPCOR 11-Sep-23 07:00 22-Sep-23 17:00 11.42 Days
Continuous		 240CV5 @ Castledowns E557S and Victoria E511S, CV5 (EP 511s Victoria - 557s Castle Downs) CV5: UGT CV5 Annual Manhole Inspections  
EPCOR 19-Sep-23 07:00 29-Sep-23 17:00 10.42 Days
Continuous		 Genesee S/S 12TC2 Bay Outage, 330P 12TC2 (330p Genesee) Screw piles installation on west end of existing 500kv bus 2  
ATCO 25-Sep-23 11:00 16-Nov-23 13:00 52.13 Days
Continuous		 885S 704, 885S 902T, 885S 500PT2, 885S 500SST2X, 885S 501, 885S 700PT2, 885s 902T (885s McMillan) 885S McMillan sub Protection Upgrade: Complete protection cut over and Commissioning of new protection on 902T, 704/7L02 Line protection, 25kV Reactor protection. On Monday October 23, 2023 will extend GOI to new isolation points: 501A,502TD1,502TD1,703B,7L02D2,906B,902A,Switch @ Round Hill (Alta Link). The following will be OOS: 900BS2, 903,902,9L55,902T,704/7L02,144kV Bus. Complete cut over and Commissioning of new protection to 240kV bus, 903,902,9L55 line protection.  
ATCO 25-Sep-23 14:30 06-Nov-23 14:00 42.02 Days
Continuous		 863S 504, 863S 901T, 863S Station Service, 863S 500PT2X, 863S 500PT2Y, 863s 901T (863s Paintearth) 863S Paintearth Protection Upgrade
Demo old wiring, from 504, demo 504/5L470 line protection panel, install new 5L470 protection, cut over 500PT2, and CT9 to new protection. Commission 504/5L570 line protection, 500PT2, and CT9. 		 
ATCO 06-Nov-23 14:30 20-Nov-23 14:00 13.98 Days
Continuous		 863S 902, 9L948, 863s 902 (863s Paintearth), 9L948 (650s Hansman Lake - 863s Paintearth) 863S Paintearth Protection Upgrade
Demo old wiring, and old Line protection panel, install and terminate new wiring, and new Line protection panel. Commission new wiring/Line protection, and new Line protection panel.

Once GOI is released 902A will need to be commissioned.		  
ATCO 14-Nov-23 10:00 14-Nov-23 17:00 7 Hours
Continuous		 9L20, 9L912, 9L20 (755s Cordel - 766s Nevis), 9L912 (63s Red Deer - 766s Nevis) 766S Nevis Rebuild Project - Hot Line crew disconnect 9L20/9L912 bypass, close open Jumper J1 and J2, Energize 240kV bus including new 903T and to 144kV bus  
ATCO 16-Nov-23 15:00 07-Dec-23 13:00 20.92 Days
Continuous		 885S 900 BUS 1, 885S 900PT1, 885S 900PT3, 885S 901, 885S 902, 885s 260kV Bus 900BS1 (885s McMillan), 9L89 (885s McMillan - 2011s Dawes) 885S McMillan sub Protection Upgrade: Complete protection cut over and Commissioning of new protection on 901,902,900PT1,9L89PT,9L89 Line Protection,900PT3.  
ATCO 20-Nov-23 14:30 04-Dec-23 14:00 13.98 Days
Continuous		 863S 901, 9L27, 863s 901 (863s Paintearth), 9L27 (755s Cordel - 863s Paintearth) 863S Paintearth Protection Upgrade
Demo old wiring, and old Line protection panel, install and terminate new wiring, and new Line protection panel. Commission new wiring/Line protection, and new Line protection panel.

Once GOI is released 901A will need to be commissioned.		  
ATCO 12-Feb-24 11:00 20-May-24 14:00 98.08 Days
Continuous		 813S 901, 813s 901 (813s Little Smoky) Take 901 OOS to open bus up and add a new 902PT, and 902 breaker bay for the new 9L201 line to MPC Gas. (February 12, 2024 - May 6, 2024)
Will need to extend 901 GOI to take 903PT, 904, and 9L05 OOS to cut over 904 trips to new protection. (May 6, 2024 - May 20, 2024)		  
ATCO 06-May-24 09:00 31-May-24 17:30 25.35 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 2-70212 FOR 13L50 GOI
USE 2-70213 FOR 2029s GOI
USE 2-70214 FOR 2075s GOI		  
ATCO 06-May-24 09:00 31-May-24 17:30 25.35 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 2-70212 FOR 13L50 GOI
USE 2-70213 FOR 2029s GOI
USE 2-70214 FOR 2075s GOI		  
ATCO 06-May-24 09:00 31-May-24 17:30 25.35 Days
Continuous		 13L50 (DC LINK), 13L50 (2029s Heathfield - 2075s Newell) Annual EATL outage at 2075s & 2029s.

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

USE 2-70212 FOR 13L50 GOI
USE 2-70213 FOR 2029s GOI
USE 2-70214 FOR 2075s GOI		  
ATCO 03-Jul-24 09:00 08-Sep-24 11:00 67.08 Days
Continuous		 848S 601, 848S 602, 848S 607, 848S 608, 848S 900BS1, 848S 901T, 848s 240kV Bus 900BS1 (848s Ruth Lake), 848s 901T (848s Ruth Lake) 848S Ruth Lake Substation Rebuild: Upgrading protection to IEC 61850, Demo 601PT,601B,601,601A,6L14D1,608A,608,608B,6LML1D1,600PT1, Replace breaker 401. Cut over to new protection: 602,607,607PT,601TD,901T,400PT1,400D1,901TD,903A,908A,913A. Install oil containment for 901T. Pull all new outdoor cable, modify cable tray, install new cable tray.  
ENMAXEC 15-Jul-24 08:00 19-Jul-24 18:00 4.42 Days
Continuous		 383s T1 (383s Kettles Hill Windfarm), 383s T2 (383s Kettles Hill Windfarm) substation maintenance  
ATCO 10-Sep-24 09:00 02-Dec-24 11:00 83.13 Days
Continuous		 848S 603, 848S 604, 848S 605T, 848S 606, 848S 848-501, 848S 848-504, 848S 848S 500BS2 25kv Protection System, 848S 900BS2, 848S 902T, 848s 240kV Bus 900BS2 (848s Ruth Lake), 848s 902T (848s Ruth Lake) 848S Ruth Lake Substation Rebuild: Upgrading protection to IEC 61850, Replace breakers 603 & 604. Cut over to new protection: 500D4,501,500D15,504,500PT2,500D10,504VR,605T,605TD,603PT,603,603CT,604,604CT,606,606CT,600PT2,605TD,902T,400PT2,402,902TD,900PT2. Install oil containment for 902T. Pull all new outdoor cable, modify cable tray, install new cable tray.  
ATCO 05-May-25 09:00 30-May-25 17:30 25.35 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 05-May-25 09:00 30-May-25 17:30 25.35 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 05-May-25 09:00 30-May-25 17:30 25.35 Days
Continuous		 13L50 (DC LINK), 13L50 (2029s Heathfield - 2075s Newell) Annual EATL outage at 2075s & 2029s.

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

USE 2-70215 FOR 13L50 GOI
USE 2-70216 FOR 2029s GOI
USE 2-70217 FOR 2075s GOI		  
ATCO, Syncrude 20-May-25 09:00 12-Jun-25 10:00 23.04 Days
Continuous		 848S 910, 848S 911, 848S RL1 SYNCRUDE ISLANDING RAS (IRAS), RL1 (848s Ruth Lake - D05) 848S Ruth Lake Sub rebuild/upgrade protection to IEC 61850 - Cut over to new protection: 910CT,910,910B,910PT,RL-1D1,911B,911,911CT.  

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: 2022-12-14   13:59:24


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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