Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2024-01-06

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 29-May-23 08:20 12-Jan-24 23:00 228.65 Days
Continuous		 840s McNeill Station filter bank forced outage AB-SK
ATCO 12-Jun-23 00:00 31-Mar-24 00:00 293 Days
Continuous		 7L64 (747s Bassett - 930s Arcenciel), 7L113 (853s Ring Creek - 930s Arcenciel) forced outage due to fire  
ATCO, SUNCOR 08-Sep-23 09:30 31-Jan-24 17:30 145.38 Days
Continuous		 29PL9-1 (29EDD-1 Millennium - 848s Ruth Lake), 848s 903 (848s Ruth Lake), 848s 906 (848s Ruth Lake) reconductor 29PL9-1 (Suncor Capacity Increase project)  
EPCOR 18-Oct-23 07:00 01-Feb-24 17:00 106.46 Days
Continuous		 987s CDS33 (987s Cloverbar) continued re-configuration of 240 kV ring for new 1191L bay construction will leave the ring open from newly energized CDS41 and CDS44 disconnects.  
ATCO 02-Jan-24 09:00 08-Jan-24 12:00 6.13 Days
Continuous		 7L32 (811s Clairmont Lake - 862s South Bezanson), 811s 710 (811s Clairmont Lake) line to ground mitigation  
ATCO 02-Jan-24 09:00 08-Jan-24 16:00 6.29 Days
Continuous		 7L40 (733s Simonette - 813s Little Smoky), 733s 702 (733s Simonette) pole replacement from test and treat  
EPCOR 04-Jan-24 07:00 08-Jan-24 17:00 4.42 Days
Continuous		 330p 1210 (330p Genesee), 330p 1211 (330p Genesee) 330P Genesee S/S tie and energization  
ALTALINK 05-Jan-24 08:00 10-Jan-24 17:00 5.38 Days
Continuous		 906L (17s Benalto - 42s Sarcee) replace insulator attachment hardware at structure 20  
ALTALINK 06-Jan-24 08:00 08-Jan-24 17:00 2.38 Days
Continuous		 1041L (370s North Lethbridge - 554s Travers) Replace insulators at structures 145, 146, 197 & 254. Re-tie all three phases at structure 172.  
ALTALINK 07-Jan-24 07:00 07-Jan-24 18:00 11 Hours
Daily		 1115L (154s Black Spruce - 170s Pike) Replace Insulators on structures 10 & 12.  
EPCOR 08-Jan-24 07:00 09-Jan-24 17:00 1.42 Days
Continuous		 987s C2402 (987s Clover Bar) Cloverbar 987S S/S C2402 bay outage  
ALTALINK 08-Jan-24 09:30 12-Jan-24 18:00 4.35 Days
Continuous		 180L (255s Vulcan - 928s East Stavely) 180L/161L Cut and add splice box to OPGW fiber 180L - STR 35-37 (Between 255s-928s) for future 1070s new substation. See also SAP: 286778 161L (504s-255s) - R/B-LL - Common Tower with 161L.  
ATCO 08-Jan-24 10:00 22-Jan-24 12:00 14.08 Days
Continuous		 9L155 (838s Horizon Mining - 849s Joslyn Creek), 849s 907 (849s Joslyn Creek) 849s Joslyn Protection Upgrade

- Move 9L155 into 901/902 Bay (former 9L66) - J3
- Demo 907 protection
- Protection ends to ends with 838s for 9L155 new line diff		  
ATCO 08-Jan-24 10:00 22-Jan-24 12:00 14.08 Days
Continuous		 849s 901 (849s Joslyn Creek), 849s 902 (849s Joslyn Creek) 849s Joslyn Protection Upgrade

- Move 9L155 into 901/902 Bay (former 9L66)
- Protection ends to ends with 838s for 9L155 new line diff		  
ALTALINK 09-Jan-24 08:00 09-Jan-24 17:00 9 Hours
Daily		 1072L (103s Goose Lake - 205s Castle Rock Ridge) Replace dead-end insulators at structure 24 behind span.  
ALTALINK 10-Jan-24 08:00 11-Jan-24 17:00 1.38 Days
Continuous		 1071L (205s Castle Rock Ridge - 312s Fidler) Replace dead-end insulators at structure 11. Replace Insulators at structure 2.  
EPCOR 15-Jan-24 07:00 02-Feb-24 17:00 18.42 Days
Continuous		 Cloverbar S/S Tx4 bay and 1191L bay, 987s CDS35 (987s Cloverbar) Continued re-configuration 240 kV ring for new 1191L bay  
Lethbridge, ALTALINK 15-Jan-24 08:00 29-Jan-24 17:00 14.38 Days
Continuous		 593s 824L (593s Lakeview), 824L (593s Lakeview - 618s Riverbend) Replacing 593s824L HV BReaker  
ALTALINK, Lethbridge 15-Jan-24 08:00 29-Jan-24 17:00 14.38 Days
Continuous		 824L (593s Lakeview - 618s Riverbend) Replace 593s824L HV Breaker  
ATCO 15-Jan-24 09:00 22-Jan-24 16:00 7.29 Days
Continuous		 7L40 (733s Simonette - 813s Little Smoky) Pole Replacement from Test and Treat  
ATCO 15-Jan-24 09:00 22-Jan-24 16:00 7.29 Days
Continuous		 7L32 (813s Little Smoky - 862s South Bezanson) Pole Change from test treat and X Arm change  
EPCOR 17-Jan-24 07:00 26-Jan-24 17:00 9.42 Days
Continuous		 330P 12TC2 (330p Genesee) 330P Genesee S/S 12BU2 outage to complete cutover of 809 breaker into new 138 kV yard  
ATCO, ALTALINK 17-Jan-24 08:00 17-Jan-24 17:00 9 Hours
Daily		 923L (356s Milo - 2075s Newell) Re-tie OHSW at structure 111.  
ALTALINK 17-Jan-24 08:00 22-Jan-24 17:00 5.38 Days
Continuous		 928L (17s Benalto - 42s Sarcee) Replace insulators at structures 101, 102, 107, 114, 119, 122, & 128. Re-tie OHAW at structures 114 & 122. Repair conductor damage at structure 123. Replace slack span insulators at 928L42s Sarcee North Side East Bay.  
ALTALINK 18-Jan-24 08:00 19-Jan-24 17:00 1.38 Days
Continuous		 935L (324s Cassils - 356s Milo) Re-install insulator pin or replace insulators at structure 151. Replace insulators at structure 162. Add penetrox and plug to existing compression splice at structure 136.  
ALTALINK 20-Jan-24 08:00 22-Jan-24 17:00 2.38 Days
Continuous		 945L (275s Jenner - 562s Cypress) Replace OHSW assemblies at structures 137 & 138. Repair conductor damage at structure 39 & 71.  
ATCO 22-Jan-24 12:01 05-Feb-24 17:30 14.23 Days
Continuous		 9L137 (838s Horizon Mining - 849s Joslyn Creek), 9L08 (849s Joslyn Creek - 888s Dover), 849s 903 (849s Joslyn Creek), 849s 904 (849s Joslyn Creek), 849s 905 (849s Joslyn Creek), 849s 906 (849s Joslyn Creek) 849s Joslyn Protection Upgrade
- Move 9L137 into 904/905 Bay (former 9L32)
- Install new 900BS2 protection
- End to end testing for new 9L137 protection

Feb 1-5 - contract GOI to 849S 904A,838S 905B, 849S 904A,849S 905B		  
ALTALINK 22-Jan-24 14:00 05-Feb-24 14:00 14 Days
Continuous		 948L (650s Hansman Lake - 863s Paintearth) Protection upgrade @ 863s - ATCO  
ALTALINK 23-Jan-24 08:00 24-Jan-24 17:00 1.38 Days
Continuous		 1002L (163s Amoco Empress - 275s Jenner) Repair OHSW and re-install marker balls at structure 72. Repair bottom phase conductor at structure 112. Replace OHSW U-Bolts at structures 137 & 138.  
ATCO 23-Jan-24 09:00 25-Jan-24 16:00 2.29 Days
Continuous		 730s STATCOM (730s Rycroft), 730s 705 (730s Rycroft) SVS Deficiency repairs by Hitachi  
ALTALINK 24-Jan-24 08:00 24-Jan-24 17:00 9 Hours
Daily		 927L (102s Langdon - 356s Milo) Repair conductor damage at structure 175.  
ALTALINK 25-Jan-24 08:00 01-Feb-24 14:00 7.25 Days
Continuous		 356s 240kV Bus1 (356s Milo) Close CI Open Point 'A' and 'B on new 1097L breaker diameter, create open point 'C' on 356s1097 riser to allow IPP to string 1097L into A frame  
ENMAX, ALTALINK 29-Jan-24 08:00 30-Jan-24 16:00 1.33 Days
Continuous		 28.80L (42s Sarcee - SS-28), 28B138-28.80 (SS-28), 28.2TR (SS-28) HV SW Maint. MD-28.2TR, SW86, SW82, SW81, SW80  
ENMAX, ALTALINK 29-Jan-24 08:00 30-Jan-24 16:00 1.33 Days
Continuous		 28.80L (42s Sarcee - SS-28) 28.80L (42s Sarcee - SS-28), 28B138-28.80 (SS-28), 28.2TR (SS-28).  
ATCO 29-Jan-24 09:00 05-Feb-24 12:00 7.13 Days
Continuous		 9L40 (732s Mitsue - 809s Louise Creek) Pole changes  
ATCO 29-Jan-24 09:00 05-Feb-24 16:00 7.29 Days
Continuous		 7L32 (813s Little Smoky - 862s South Bezanson) Pole change from test and treat / X Arm change  
ATCO 29-Jan-24 09:00 05-Feb-24 16:00 7.29 Days
Continuous		 7L40 (733s Simonette - 813s Little Smoky) 7l40 Line to ground mitigation  
ATCO 29-Jan-24 11:00 02-Feb-24 17:30 4.27 Days
Continuous		 840s McNeill Station Transformer 701T has an active leak between the main tank and LTC tank requiring oil to be drained monthly in order to prevent surpassing safe operating maximum levels. Hitachi is coming to site to remove the diverter and replace O rings and gaskets in efforts to stop the leak. In addition, they wil  
ALTALINK 31-Jan-24 07:00 31-Jan-24 18:00 11 Hours
Daily		 908L (89s Ellerslie - 908AL tap), 908L (38s East Edmonton - 908AL tap) Replace insulators at structures 240 & 249.  
ALTALINK, EPCOR 01-Feb-24 07:00 01-Feb-24 18:00 11 Hours
Daily		 908L (89s Ellerslie - 816s Petrolia) Replace dead-end insulators at 89s Ellerslie West Side North Bay IN A-frame.  
ATCO 01-Feb-24 08:00 05-Feb-24 17:30 4.4 Days
Continuous		 9L137 (838s Horizon Mining - 849s Joslyn Creek), 849s 904 (849s Joslyn Creek), 849s 905 (849s Joslyn Creek) This outage request is just to show the contraction of the Isolations that are referenced in 1-00425862  
EPCOR 05-Feb-24 07:00 23-Feb-24 17:00 18.42 Days
Continuous		 Cloverbar S/S Tx2 bay and 1191L bay, 987s CDS32 (987s Cloverbar) Continued re-configuration 240 kV ring for new 1191L bay. 1191L to be energize post outage with new isolation point of CDS45 to remain until 1191L is ready to energize.  
BCH 05-Feb-24 09:00 09-Feb-24 17:00 4.33 Days
Continuous		 2L294 (BCH A. A. Lambert - BCH Nelway) replace structures and lacing AB-BC
ENMAX, ALTALINK 05-Feb-24 09:15 08-Feb-24 16:45 3.31 Days
Continuous		 937L (5s East Calgary - 102s Langdon), 5s 1552 (5s East Calgary), 5s 1652 (5s East Calgary), 5s 937 (5s East Calgary) SCADA upgrade  
ATCO 05-Feb-24 10:00 16-Feb-24 18:30 11.35 Days
Continuous		 786s SVC (786s High Level), 786s 703T (786s High Level) Qualitrol ITM Replacement.  
ALTALINK 05-Feb-24 12:00 05-Feb-24 18:00 6 Hours
Daily		 447s T2 (447s Enchant) Salvage telecom tower. Crane proximity to bus requires outage.  
ATCO, ALTALINK 12-Feb-24 09:00 15-Feb-24 16:30 3.31 Days
Continuous		 7L50 (526s Buffalo Creek - 491L tap), 7L50 (757s Battle River - 491L tap) 7L50 Pole and arm replacement  
ATCO 12-Feb-24 09:00 18-Feb-24 16:00 6.29 Days
Continuous		 7L32 (813s Little Smoky - 862s South Bezanson) Pole change from test and treat / X Arm change  
ALTALINK 12-Feb-24 09:30 13-Feb-24 17:30 1.33 Days
Continuous		 74s 102 (74s Janet), 74s 103 (74s Janet), 74s C3 (74s Janet), 74s C4 (74s Janet) Outage required to perform mtce. on non-redundant protections.  
ALTALINK 12-Feb-24 09:30 15-Feb-24 16:45 3.3 Days
Continuous		 916L (5s East Calgary - 42s Sarcee) SCADA Upgrade  
ATCO 13-Feb-24 09:00 17-Feb-24 17:00 4.33 Days
Continuous		 7L85 (801s Anderson - ATC 803s Bullpound) 7L85 Line Mitigation. Replace/modify structures 19, 72, 86, 96, 138, 204, 206, 208, 238, 245, 249, 250.  
ATCO 18-Feb-24 09:00 22-Feb-24 17:00 4.33 Days
Continuous		 7L85 (801s Anderson - ATC 803s Bullpound) 7L85 Line Mitigation. Replace/modify/install new structures, 335, 382, 383, 392, 397A, 409, 417, 447  
ATCO, SUNCOR 19-Feb-24 08:00 28-Feb-24 17:00 9.38 Days
Continuous		 9L162 (29EDD-94 Voyageur - 951s Thickwood Hills) project deficiencies clean up on line  
ATCO 19-Feb-24 14:30 04-Mar-24 14:00 13.98 Days
Continuous		 863S 901, 9L27, 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, ALTALINK 20-Feb-24 09:00 22-Feb-24 16:30 2.31 Days
Continuous		 7L50 (526s Buffalo Creek - 491L tap), 7L50 (757s Battle River - 491L tap) 7L50 Pole and arm replacement  
ENMAX, ALTALINK 20-Feb-24 09:15 22-Feb-24 16:45 2.31 Days
Continuous		 936L (5s East Calgary - 102s Langdon) SCADA Upgrade  
ATCO 20-Feb-24 15:00 05-Mar-24 13:00 13.92 Days
Continuous		 9L89, 885S 900 BUS 1, 885S 900PT1, 885S 900PT3, 885S 901, 885S 902, 9L89 (885s McMillan - 2011s Dawes), 885s 260kV Bus 900BS1 (885s McMillan) 885S McMillan sub Protection Upgrade: Complete protection cut over and Commissioning of new protection on 901,902,900PT1,9L89PT,9L89 Line Protection,900PT3.  
ATCO 26-Feb-24 09:00 04-Mar-24 16:00 7.29 Days
Continuous		 7L32 (813s Little Smoky - 862s South Bezanson) Pole change from test and treat / X Arm change  
ENMAX, ALTALINK 26-Feb-24 09:30 01-Mar-24 12:30 4.13 Days
Continuous		 5s T1 (5s East Calgary) SCADA Upgrade  
ENMAX, ALTALINK 26-Feb-24 09:30 01-Mar-24 12:30 4.13 Days
Continuous		 5s T1 (5s East Calgary) Altalink Outage. SCADA Upgrade  
ALTALINK 26-Feb-24 13:00 08-Mar-24 12:00 10.96 Days
Continuous		 676L (244s Bowmanton - 523s Bullshead), 244s 2152 (244s Bowmanton), 244s 2252 (244s Bowmanton), 523s 676 (523s Bullshead) Install and commission new circuits and protections pertaining to the Dunmore Project  
ALTALINK 27-Feb-24 07:30 27-Feb-24 17:30 10 Hours
Daily		 251s 1352 (251s Whitla), 251s SR1 (251s Whitla) Install and commission new trip and close circuits to breaker 251s1352 pertaining to the Dunmore Solar Project RAS 214 Scope.  
ALTALINK 28-Feb-24 07:30 28-Feb-24 17:30 10 Hours
Daily		 251s 34 (251s Whitla), 251s SR2 (251s Whitla) Install and commission new trip and close circuits to breaker 251s1452 pertaining to the Dunmore Solar Project RAS 214 Scope.  
ATCO, SUNCOR 29-Feb-24 08:00 09-Mar-24 17:00 9.38 Days
Continuous		 9L193 (29EDD-94 Voyageur - 951s Thickwood Hills) project deficiencies clean up on line  
ENMAX, ALTALINK 04-Mar-24 09:30 08-Mar-24 12:30 4.13 Days
Continuous		 5s T2 (5s East Calgary) SCADA Upgrade  
ENMAX, ALTALINK 04-Mar-24 09:30 08-Mar-24 12:30 4.13 Days
Continuous		 5s T2 (5s East Calgary) Altalink Outage. SCADA Upgrade  
ATCO 04-Mar-24 14:30 18-Mar-24 15:00 13.98 Days
Continuous		 9L948 (650s Hansman Lake - 863s Paintearth), 863s 902 (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 11-Mar-24 09:00 14-Mar-24 16:00 3.29 Days
Continuous		 9L56 (720s Wabasca - 732s Mitsue) Line Mitigation ( Critical Crossing )  
ATCO 11-Mar-24 09:00 18-Mar-24 16:00 7.29 Days
Continuous		 7L32 (813s Little Smoky - 862s South Bezanson) Pole change from test and treat / X Arm change  
ALTALINK 11-Mar-24 12:15 15-Mar-24 17:45 4.23 Days
Continuous		 702L (137s Sedgewick - 757s Battle River) FRM; Component Replacement (Str 11-197)  
ALTALINK 12-Mar-24 07:00 12-Mar-24 18:00 11 Hours
Daily		 880L (321s Al Rothbauer - 523s Bullshead), 321s 880 (321s Al Rothbauer), 523s 880 (523s Bullshead) install and commission new circuits and protections pertaining to the Dunmore Project  
ATCO, ALTALINK 18-Mar-24 10:30 21-Mar-24 16:30 3.25 Days
Continuous		 7L50 (526s Buffalo Creek - 491L tap), 7L50 (757s Battle River - 491L tap) 7L50 Pole and arm replacement  
ALTALINK 18-Mar-24 12:15 27-Mar-24 17:45 9.23 Days
Continuous		 702L (137s Sedgewick - 757s Battle River) FRM; Component Replacement (Str 11-197)  
ATCO 18-Mar-24 14:30 29-Apr-24 14:00 41.98 Days
Continuous		 863s 902T (863s Paintearth) protection upgrade, Commission new wiring/Transformer protection, and new Transformer protection panel  
ALTALINK 22-Mar-24 07:30 22-Mar-24 12:30 5 Hours
Daily		 244s 152 (244s Bowmanton) Install and commission new circuits and protections pertaining to the Dunmore Project  
ALTALINK 25-Mar-24 07:00 27-Mar-24 18:00 2.46 Days
Continuous		 925L (63s Red Deer - 74s Janet) Component Replacement between Structures #1 - 369  
ALTALINK 25-Mar-24 12:00 25-Mar-24 17:00 5 Hours
Daily		 244s 452 (244s Bowmanton) Install and commission new circuits and protections pertaining to the Dunmore Project  
ALTALINK 26-Mar-24 12:30 26-Mar-24 17:30 5 Hours
Daily		 244s 352 (244s Bowmanton) install and commission new circuits and protections pertaining to the Dunmore Project  
ALTALINK 27-Mar-24 07:30 27-Mar-24 12:30 5 Hours
Daily		 244s 652 (244s Bowmanton) install and commission new circuits and protections pertaining to the Dunmore Project  
ATCO, ALBIAN, CNRL 29-Mar-24 08:00 17-Apr-24 14:00 19.25 Days
Continuous		 919s 908 (919s Hartley), 847s 902T (847s Muskeg River) CNRL Albian Sands Utilities request a COG  
ENMAX 30-Mar-24 08:00 01-Apr-24 18:00 2.42 Days
Continuous		 65.2TR (SS-65) HV SW Maint. SW141, SW135, SW86, SW93, SW87, MD138-65.2TR, MD240-65.2TR. 65.2TR Oil Sampling MT, TC. Check reversing switch. Gas Monitor Maintenance. Transformer Monitor Maintenance.  
ALTALINK 02-Apr-24 07:00 02-Apr-24 18:00 11 Hours
Daily		 244s T1 (244s Bowmanton) install and commission new circuits and protections pertaining to the Dunmore Project  
ALTALINK 02-Apr-24 07:00 12-Apr-24 18:00 10.46 Days
Continuous		 925L (63s Red Deer - 74s Janet) Component Replacement between Structures #1 - 369  
ENMAX 02-Apr-24 08:00 04-Apr-24 18:00 2.42 Days
Continuous		 65.1TR (SS-65) HV SW Maint. SW130, SW136, SW88, SW80, SW81, SW83, MD138-65.1TR, MD240-65.1TR. 65.1TR Oil Sampling MT, TC. Check reversing switch. Gas Monitor Maintenance. Transformer Monitor Maintenance. Bus washing.  
SUNCOR 02-Apr-24 08:00 16-Apr-24 16:00 14.33 Days
Continuous		 29PL9-5 (29EDD-1 Millennium - 29EDD-34) BP - System 5 year PMs for Breakers, CTs & Disconnect Switches @ 29EDD-34 and 29EDD-01  
ATCO 02-Apr-24 09:00 08-Apr-24 16:00 6.29 Days
Continuous		 7L32 (813s Little Smoky - 862s South Bezanson) Pole replacement from Test and Treat  
ALTALINK 02-Apr-24 12:15 05-Apr-24 17:45 3.23 Days
Continuous		 702L (137s Sedgewick - 757s Battle River) FRM; Component Replacement (Str 11-197)  
ALTALINK 02-Apr-24 12:30 11-Apr-24 16:00 9.15 Days
Continuous		 158s T2 (158s Vauxhall) 158sT2 Oil Reclaim/Tx leak repair  
ALTALINK 03-Apr-24 07:00 03-Apr-24 18:00 11 Hours
Daily		 244s T2 (244s Bowmanton) install and commission new circuits and protections pertaining to the Dunmore Project  
ALTALINK 03-Apr-24 08:30 03-Apr-24 17:30 9 Hours
Daily		 613L (103s Goose Lake - 396s Pincher Creek) Clean/Grease 103s21 & 103s1352,103s1452 First Trips on return switching.  
ENMAX, ALTALINK 05-Apr-24 08:00 06-Apr-24 16:00 1.33 Days
Continuous		 1109L (SS-25 - SS-65), 25B240-D141 (SS-25), 25B240-D142 (SS-25) HV SW Maint. MD-1109, SW152, SW153. Power Factor Test - 25PT240-985  
ENMAX, ALTALINK 07-Apr-24 08:00 08-Apr-24 16:00 1.33 Days
Continuous		 1080L (SS-25 - SS-65), 25B240-D139 (SS-25), 25B240-D138 (SS-25) HV SW Maint. MD-1080, SW147, SW146. Power Factor Test - 25PT240-1080  
ATCO 08-Apr-24 10:00 14-Apr-24 09:59 6 Days
Continuous		 728s 701T (728s Mercer Hill) Replace Bkr 503 and 503B
Once 503/503B and all 501A, 502A, 503A solid blade switches are replaced and commissioned, restore 25kV bus, GOI can be shrunk to isolation points 7LA39D2 and 501TD
Continue with 701T protection upgrade, relocate 144 alarms, status, control to new station controller		  
ENMAX, ALTALINK 09-Apr-24 08:00 10-Apr-24 16:00 1.33 Days
Continuous		 985L (74s Janet - SS-25) HV SW Maint. MD-985, SW135, SW134. Summer Substation Washing. D133, D132, MD-985  
ENMAX 09-Apr-24 08:00 12-Apr-24 18:00 3.42 Days
Continuous		 240kV West Bus (SS-25), 25B240-D142 (SS-25), 25B240-D139 (SS-25), 25B240-D136 (SS-25), 25B240-D133 (SS-25) Summer Substation Washing. Outage required for washing stand off insulators near transmission lines.  
ENMAX, ALTALINK 11-Apr-24 08:00 12-Apr-24 16:00 1.33 Days
Continuous		 1003L (74s Janet - SS-25), 25B240-D136 (SS-25), 25B240-D135 (SS-25) HV SW Maint. MD-1003, SW141, SW140. Power Factor Test - 25PT240-1003. Summer Substation Washing. D136, D135, MD-1003  
ENMAX, ALTALINK 11-Apr-24 08:00 12-Apr-24 16:00 1.33 Days
Continuous		 1003L (74s Janet - SS-25) Summer Substation Washing. D136, D135, MD-1003.  
ENMAX 13-Apr-24 08:00 14-Apr-24 16:00 1.33 Days
Continuous		 25B240-D142 (SS-25), 25B240-D139 (SS-25), 25B240-D136 (SS-25), 25B240-D133 (SS-25) HV SW Maint. SW154, SW148, SW142, SW136  
ATCO 14-Apr-24 10:00 19-Apr-24 17:00 5.29 Days
Continuous		 728s 701T (728s Mercer Hill) 701T protection upgrade, relocate 144 alarms, status, control to new station controller
25kV fed via their respective breakers from mobile 902S		  
ALTALINK 15-Apr-24 07:00 19-Apr-24 18:00 4.46 Days
Continuous		 925L (63s Red Deer - 74s Janet) Component Replacement between Structures #1 - 369  
EPCOR 15-Apr-24 07:00 22-Apr-24 07:00 7 Days
Continuous		 816s P2402 (816s Petrolia), 816s P2401 (816s Petrolia), 816s T1 (816s Petrolia) Petrolia: P2401 Breaker LCR  
ENMAX 15-Apr-24 08:00 16-Apr-24 16:00 1.33 Days
Continuous		 2GSU-XF-001 (SS-25) HV SW Maint. MD-2GSU, SW138, SW139. Power Factor Test - 25PT240-Z44. Power Factor Test - 25BUS240-25MCT2  
ATCO 15-Apr-24 09:00 22-Apr-24 16:00 7.29 Days
Continuous		 7L32 (813s Little Smoky - 862s South Bezanson) Pole replacement from Test and Treat  
ALTALINK 15-Apr-24 13:30 19-Apr-24 17:00 4.15 Days
Continuous		 28s T2 (28s West Brooks) 28sT2 PRC5, Leak repair, Maintenance.  
ENMAX 16-Apr-24 08:00 16-Apr-24 13:00 5 Hours
Continuous		 2GSU-XF-001 (SS-25) Summer Substation Washing  
ENMAX 17-Apr-24 08:00 17-Apr-24 18:00 10 Hours
Continuous		 1GSU-XF-001 (SS-25) Summer Substation Washing  
SUNCOR 17-Apr-24 08:00 30-Apr-24 16:00 13.33 Days
Continuous		 29PL9-6 (29EDD-1 Millennium - 29EDD-34) BP - System 5 year PMs for Breakers, CTs & Disconnect Switches @ 29EDD-34 and 29EDD-01  
ENMAX 19-Apr-24 08:00 20-Apr-24 16:00 1.33 Days
Continuous		 25B240-D140 (SS-25), 25B240-D134 (SS-25), 25B240-D131 (SS-25) HV SW Maint. SW149, SW145, SW137, SW131. Power Factor Test - 25PT240-Z41  
ALTALINK 22-Apr-24 07:00 25-Apr-24 18:00 3.46 Days
Continuous		 925L (63s Red Deer - 74s Janet) Component Replacement between Structures #1 - 369  
EPCOR 22-Apr-24 07:00 10-May-24 17:00 18.42 Days
Continuous		 816s P2401 (816s Petrolia) Petrolia: P2401 Breaker LCR  
ALTALINK 23-Apr-24 08:30 23-Apr-24 13:30 5 Hours
Daily		 15s 463 (15s Fort Macleod), 463L (15s Fort Macleod - 463AL tap) 15s463 PRC 5 First Trip and maint.  
ALTALINK 23-Apr-24 09:00 30-Apr-24 18:00 7.38 Days
Continuous		 492s T1 (492s Monarch) Doble, SFRA, maintenance, oil leaks and P5 breaker maintenance. s455X U/G cable repair. 492s6 inoperable repairs.  
ALTALINK 29-Apr-24 07:30 03-May-24 16:30 4.38 Days
Continuous		 AML 511s FB Bus 1 (AML 511s Crossings), AML 511s ACF11 (AML 511s Crossings), AML 511s ACF12 (AML 511s Crossings), AML 511s ACF13 (AML 511s Crossings), AML 511s T30 (AML 511s Crossings), AML 511s SVC Plus (AML 511s Crossings) Annual ACF 11, 12, 13 Inspections, Bird Mitigation on Reactors in Filter  
ATCO 29-Apr-24 14:30 10-Jun-24 14:00 41.98 Days
Continuous		 863S 504, 863S 901T, 863S Station Service, 863S 500PT2X, 863S 500PT2Y, 863s 901T (863s Paintearth) 863S Paintearth Protection Upgrade  
ATCO 06-May-24 09:00 19-May-24 17:30 13.35 Days
Continuous		 2029S BUILDING VALVE HALL, 2029s 1205 (2029s Heathfield), 2029s 1206 (2029s Heathfield) Annual EATL outage at 2075s & 2029s.

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

USE 2-70212 FOR 13L50 GOI
USE 2-70213 FOR 2029s GOI
USE 2-70214 FOR 2075s GOI		  
ATCO 06-May-24 09:00 19-May-24 17:30 13.35 Days
Continuous		 2075S BUILDING VALVE HALL, 2075s 916 (2075s Newell), 2075s 917 (2075s Newell) Annual EATL outage at 2075s & 2029s.

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

USE 2-70212 FOR 13L50 GOI
USE 2-70213 FOR 2029s GOI
USE 2-70214 FOR 2075s GOI		  
ATCO 06-May-24 09:00 19-May-24 17:30 13.35 Days
Continuous		 13L50 (DC LINK), 13L50 (2029s Heathfield - 2075s Newell) Annual EATL outage at 2075s & 2029s.

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

USE 2-70212 FOR 13L50 GOI
USE 2-70213 FOR 2029s GOI
USE 2-70214 FOR 2075s GOI		  
ATCO 13-May-24 10:00 22-May-24 10:00 9 Days
Continuous		 9L16, 9L16 (755s Cordel - 972s Tinchebray) Upgrade 9L16 21A and 21B relays at both 755S Cordel and 972S Tinchebray.
Connect new 9LA16 to new 620S Goldeye substation		  
ALTALINK 15-May-24 09:00 15-May-24 16:00 7 Hours
Daily		 602s 847 (602s Cold Creek), 847L (602s Cold Creek - 847AL tap) 1st trip and PRC 5 maintenance, replace SF6 gauge  
EPCOR 21-May-24 07:00 14-Jun-24 17:00 24.42 Days
Continuous		 816s P2402 (816s Petrolia) Petrolia: P2402 Breaker LCR  
SUNCOR 29-May-24 08:00 14-Jun-24 18:00 16.42 Days
Continuous		 29PT-232 29PT-240, 29EDD-71 29PT-232 (29EDD-71), 29PL7-4 (29EDD-65 - 29EDD-71), 29EDD-71 29PS-243 (29EDD-71 Edd71Sub), 29EDD-71 29PS-242 (29EDD-71 Edd71Sub), 29EDD-71 752-4623 (29EDD-71) FB - 29EDD-71,29PS-0242 REPLACE / REPAIR, 29PL7-4 ;29PS-243 REPLACE SWITCH, 29EDD71;29PT-232 SYSTEM;PM 5Y (46756865)
29EDD-71;144KV NODE,29PT-240 (46699353), 29EDD71;29-752-4623 MAINT & TEST;PM 10y

  
ALTALINK 03-Jun-24 07:30 06-Jun-24 16:30 3.38 Days
Continuous		 AML 511s T30 (AML 511s Crossings), AML 511s SVC Plus (AML 511s Crossings) ACF14 and SVC+ Inspection & Maintenance.  
ATCO 03-Jun-24 08:00 14-Jun-24 17:30 11.4 Days
Continuous		 12L41 (510s Sunnybrook - 939s Livock), 12L44 (939s Livock - 951s Thickwood Hills) APL O&M outage

Use 2-70262 for 12L44 GOI
Use 2-70263 for 939s-APL GOI
Use 2-70264 for 951s-APL GOI
APL O&M outage

Use 2-70262 for 12L44 GOI
Use 2-70263 for 939s-APL GOI
Use 2-70264 for 951s-APL GOI		  
SUNCOR 04-Jun-24 08:00 18-Jun-24 18:00 14.42 Days
Continuous		 29PL6-22 (29EDD-1 Millennium - 29EDD-2 Tar Island), 29EDD-2 29PT-3 (29EDD-2 Tar Island) isolation and PM and corrective on 29PP-1/2 buses. for this isolation there will be momentary loss during switching once for PL6-32 once the ring bus is closed this will come back online.  
ALTALINK 10-Jun-24 07:30 14-Jun-24 16:30 4.38 Days
Continuous		 AML 511s 240kV ACF 2 Bus (511s Crossings), AML 511s ACF21 (AML 511s Crossings), AML 511s ACF22 (AML 511s Crossings) Annual ACF 21, 22 Inspections, Bird Mitigation on Reactors in Filter  
ALTALINK 10-Jun-24 08:00 11-Jun-24 17:00 1.38 Days
Continuous		 676L (244s Bowmanton - 523s Bullshead) OPGW will be cut and spliced into to bring the fiber down for the new 1011s Dunmore Substation  
CNRL, ATCO 10-Jun-24 08:00 17-Jun-24 07:00 6.96 Days
Continuous		 859s 52G (859s Primrose), 859s 701T (859s Primrose), 859s Protection & Control (859s Primrose)
701T will be isolated to start work on 25kV switchgear project - 501TD will be left open after the outage.
70T1 XFMR Diff relay and 144kV overcurrent relay will have settings changes for PRC-025 compliance. 		 
SUNCOR 12-Jun-24 08:00 25-Jun-24 16:00 13.33 Days
Continuous		 29EDD-1 T1 (29EDD-1 Millennium) BP - 29EDD-1 T1 Bushings; 72kv Arresters Replacement; 29EDD1S1052 Densimeter Replacement; 29EDD1S852 Replace Densimeter; OLTC Maintenance and Testing  
EPCOR 24-Jun-24 07:00 19-Jul-24 17:00 25.42 Days
Continuous		 816s P2403 (816s Petrolia) Petrolia: P2403 Breaker LCR  
SUNCOR 01-Jul-24 08:00 07-Jul-24 16:00 6.33 Days
Continuous		 29EDD-1 29EDD1s1252 (29EDD-1 Millennium) BP - 29EDD1;29CVT-2 SYSTEM;PM 5y,10y; 29EDD1S252 Breaker
  
ALTALINK 02-Jul-24 12:30 11-Jul-24 15:30 9.13 Days
Continuous		 370s T5 (370s North Lethbridge) 370sT5 Maintenance 370s2252 Maint.  
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, Replace breaker 401. Cut over to new protection, Install oil containment for 901T. Pull all new outdoor cable, modify cable tray, install new cable tray.  
SUNCOR 09-Jul-24 08:00 16-Jul-24 16:00 7.33 Days
Continuous		 29EDD-94 29PS-393 (29EDD-94 Voyageur) BP - 29EDD-94, 29PS-393 Control Fail Alarm
  
ATCO 09-Jul-24 10:00 01-Aug-24 17:00 23.29 Days
Continuous		 9L24 (946s Oakland - 959s Lanfine), 959s 906 (959s Lanfine), 959s 905 (959s Lanfine), 946s 902 (946s Oakland), 946s 903 (946s Oakland) Replace A/B protection relays at 959S Lanfine and 946S Oakland
Cut in and reroute 9L24
Connect new 9LA24 T-tap
Commission Telecom and Protection to new 1072S Rose Lynn substation		  
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  
ALTALINK 16-Jul-24 07:00 18-Jul-24 19:30 2.52 Days
Continuous		 1148L (251s Whitla - 1018s Shamrock) Annual Substation Maintenance Outage  
EPCOR 29-Jul-24 07:00 23-Aug-24 17:00 25.42 Days
Continuous		 816s P2404 (816s Petrolia) Petrolia: P2404 Breaker LCR  
ATCO 04-Aug-24 10:00 04-Aug-24 17:00 7 Hours
Continuous		 801S 902, 801s 902 (801s Anderson) Final connection of Bkr 902/52a single pole status inputs to DFR, Commission  
ATCO 06-Aug-24 10:00 01-Sep-24 15:00 26.21 Days
Continuous		 741s 702T (741s Fox Creek), 7L199 (347s AML Fox Creek - 741s ATC Fox Creek), 741s 702 (741s ATC Fox Creek), 741s 705C (741s Fox Creek) Demo 144kV bus and structures up to J1, install new foundations, steel structures up to J1, Demo old PT, Replace gang switches 7L199D1 & 702A, string new overhead bus and connect equipment.
Complete protection upgrade & Commissioning activities to accommodate 7L199 upgrade and 7LA199 T-Tap.
  
ATCO 07-Aug-24 08:00 19-Aug-24 10:01 12.08 Days
Continuous		 788S 701T, 788s 701T (788s Hotchkiss) Remove 701TCS, add NEW 707 breaker and switch 707A. Add NEW 701T  
ATCO 13-Aug-24 10:00 13-Aug-24 17:00 7 Hours
Continuous		 801S 903, 801s 903 (801s Anderson) Final connection of Bkr 903 52a single pole status inputs to DFR, Commission  
ATCO 14-Aug-24 10:00 14-Aug-24 17:00 7 Hours
Continuous		 801S 904, 801s 904 (801s Anderson) Final connection of Bkr 904 52a single pole status inputs to DFR, Commission  
ATCO 15-Aug-24 10:00 15-Aug-24 17:00 7 Hours
Continuous		 801s 905 (801s Anderson) Final connection of Bkr 905 52a single pole status inputs to DFR, Commission  
ATCO 16-Aug-24 10:00 16-Aug-24 17:00 7 Hours
Continuous		 801s 906 (801s Anderson) Final connection of Bkr 906 52a single pole status inputs to DFR, Commission  
ATCO 17-Aug-24 10:00 17-Aug-24 17:00 7 Hours
Continuous		 801s 907 (801s Anderson) Final connection of Bkr 907 52a single pole status inputs to DFR, Commission  
ATCO 18-Aug-24 10:00 18-Aug-24 17:00 7 Hours
Continuous		 801s 908 (801s Anderson) Final connection of Bkr 908 52a single pole status inputs to DFR, Commission  
ATCO 27-Aug-24 10:00 27-Aug-24 17:00 7 Hours
Continuous		 801s 909 (801s Anderson) Final connection of Bkr 909 52a single pole status inputs to DFR, Commission  
ATCO 28-Aug-24 10:00 28-Aug-24 17:00 7 Hours
Continuous		 801s 910 (801s Anderson) Final connection of Bkr 910 52a single pole status inputs to DFR, Commission  
ATCO 29-Aug-24 10:00 29-Aug-24 17:00 7 Hours
Continuous		 801s 911 (801s Anderson) Final connection of Bkr 911 52a single pole status inputs to DFR, Commission  
ATCO 30-Aug-24 10:00 30-Aug-24 17:00 7 Hours
Continuous		 801s 912 (801s Anderson) Final connection of Bkr 912 52a single pole status inputs to DFR, Commission  
ALTALINK 02-Sep-24 07:30 02-Sep-24 12:00 4.5 Hours
Daily		 1202L (89s Ellerslie - 320p Keephills), 320p 3152 (320p Keephills), 320p 3052 (320p Keephills) Connect Summated 1202L CT from 320p3152 & 320p3052 to new PMU  
ALTALINK, EPCOR 02-Sep-24 12:00 02-Sep-24 16:30 4.5 Hours
Daily		 1203L (320p Keephills - 510s Sunnybrook), 320p 3452 (320p Keephills), 320p 2952 (320p Keephills) Connect Summated 1203L CT from 320p3452 & 320p2952 to new PMU  
EPCOR 03-Sep-24 07:00 10-Sep-24 07:00 7 Days
Continuous		 816s T1 (816s Petrolia), 816s P2404 (816s Petrolia), 816s P2405 (816s Petrolia) Petrolia: P2405 Breaker LCR  
ALTALINK 03-Sep-24 07:30 03-Sep-24 12:00 4.5 Hours
Daily		 1045AL (320p Keephills - 1045L tap), 320p 1352 (320p Keephills) Connect 1045AL CT from 320p1352 to new PMU  
ALTALINK, EPCOR 03-Sep-24 12:00 03-Sep-24 16:30 4.5 Hours
Daily		 1043L (320p Keephills - 367s Harry Smith), 320p 252 (320p Keephills), 320p 352 (320p Keephills) Connect Summated 1043L CT from 320p252 & 320p352 to new PMU  
ALTALINK 04-Sep-24 07:30 04-Sep-24 12:00 4.5 Hours
Daily		 190L (17s Benalto - 320p Keephills), 320p 652 (320p Keephills), 320p 552 (320p Keephills) Connect Summated 190L CT from 320p552 & 320p652 to new PMU  
ALTALINK, EPCOR 04-Sep-24 12:00 04-Sep-24 16:30 4.5 Hours
Daily		 930L (37s North Calder - Poundmaker), 320p 2052 (320p Keephills), 320p 2152 (320p Keephills) Connect Summated 903L CT from 320p2052 & 320p2152 to new PMU  
EPCOR 10-Sep-24 07:00 27-Sep-24 17:00 17.42 Days
Continuous		 816s P2405 (816s Petrolia) Petrolia: P2405 Breaker LCR  
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: Install oil containment for 902T. Pull all new outdoor cable, modify cable tray, install new cable tray.  
ATCO 16-Sep-24 08:00 29-Sep-24 17:00 13.38 Days
Continuous		 788s 703 (788s Hotchkiss), 7L63 (788s Hotchkiss - 7LA63 tap) 703 breaker replacement  
ALTALINK 23-Sep-24 08:00 04-Oct-24 18:00 11.42 Days
Continuous		 1201L (520s Bennett - BCH Cranbrook) Maintenance tasks str range 18-513.  
ALTALINK, EPCOR 07-Oct-24 00:00 18-Oct-24 00:00 11 Days
Continuous		 908L (89s Ellerslie - 816s Petrolia), 1044L (EP 805s Jasper - 816s Petrolia) Petrolia: P2406 Breaker LCR  
ALTALINK, EPCOR 07-Oct-24 09:30 18-Oct-24 17:00 11.31 Days
Continuous		 1044L (EP 805s Jasper - 816s Petrolia), 908L (89s Ellerslie - 816s Petrolia), 816s P2401 (816s Petrolia), 816s P2405 (816s Petrolia), 816s P2406 (816s Petrolia) Petrolia: P2406 Breaker LCR  
EPCOR 18-Oct-24 17:00 01-Nov-24 17:00 14 Days
Continuous		 816s P2406 (816s Petrolia) Petrolia: P2406 Breaker LCR  
ATCO 11-Nov-24 10:00 25-Nov-24 17:00 14.29 Days
Continuous		 9L100 (801s Anderson - 807s Sheerness) Replace Breaker 902 @ 807S Sheerness, complete line 21A, 21B/9L100 protection upgrade and Commissioning  
ATCO 17-Feb-25 08:00 20-Feb-25 17:00 3.38 Days
Continuous		 7L128 (802s Michichi Creek - 7LA128 tap) Installation of dynamic line rating sensors.  
ATCO 24-Mar-25 08:00 27-Mar-25 17:00 3.38 Days
Continuous		 7L91 (715s Leming Lake - 826s Marguerite Lake) Cold Lake Area Energy Centre Project
Cutover CT/PT/P&C ccts for new Thermal RAS relays
Complete commissioning 49A/49B/7L91 relays
End-to-end testing to 1064S		  
ATCO 29-Apr-25 10:00 20-May-25 17:00 21.29 Days
Continuous		 9L99 (801s Anderson - 807s Sheerness) Replace Breaker 901 @ 807S Sheerness, complete line 21A, 21B/9L99 protection upgrade and Commissioning  
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.  
ATCO 12-Jun-25 11:00 04-Jul-25 09:00 21.92 Days
Continuous		 848S 911, 848S 913, 9L01 (848s Ruth Lake - 951s Thickwood Hills), 848s 911 (848s Ruth Lake), 848s 913 (848s Ruth Lake) 848S Ruth Lake Sub rebuild/upgrade protection to IEC 61850 - Cut over to new protection: 911,911CT,912B,9L01D1,913PT,913B,913,913CT  
ATCO 04-Jul-25 11:00 24-Jul-25 09:00 19.92 Days
Continuous		 848S 905, 848S 906, 9L23 (848s Ruth Lake - 977s Salt Creek), 848s 905 (848s Ruth Lake), 848s 906 (848s Ruth Lake) 848S Ruth Lake Sub rebuild/upgrade protection to IEC 61850 - Cut over to new protection: 905CT,905,905B,905PT,9L23D1,906B,906,906CT,906A.  
ATCO, SUNCOR 24-Jul-25 11:00 14-Aug-25 09:00 20.92 Days
Continuous		 848S 906, 848S 903, 848S 29PL9-1 SUNCOR ISLANDING RAS (IRAS), 29PL9-1 (29EDD-1 Millennium - 848s Ruth Lake), 848s 903 (848s Ruth Lake), 848s 906 (848s Ruth Lake) 848S Ruth Lake Sub rebuild/upgrade protection to IEC 61850 - Cut over to new protection: 906,906CT,904B,29PL9-1D1,903PT,903B,903,903CT.  
ATCO, SUNCOR 14-Aug-25 11:00 04-Sep-25 09:00 20.92 Days
Continuous		 848S 901, 848S 902, 848S 29PL9-2 SUNCOR ISLANDING RAS (IRAS), 29PL9-2 (29EDD-1 Millennium - 848s Ruth Lake), 848s 901 (848s Ruth Lake), 848s 902 (848s Ruth Lake) 848S Ruth Lake Sub rebuild/upgrade protection to IEC 61850 - Cut over to new protection: 901CT,901,901B,901PT,29PL9-2D1,902B,902,902CT.  
ATCO, Syncrude 04-Sep-25 11:00 25-Sep-25 09:00 20.92 Days
Continuous		 848S 902, 848S 907, 848s 902 (848s Ruth Lake), 848s 907 (848s Ruth Lake), RL2 (848s Ruth Lake - D05) 848S Ruth Lake Sub rebuild/upgrade protection to IEC 61850 - Cut over to new protection: 902,902CT,902A,902PT,RL-2D1,907A,907CT,907.  
ATCO 25-Sep-25 11:00 17-Oct-25 14:00 22.13 Days
Continuous		 848S 907, 848S 908, 9L58 (848s Ruth Lake - 888s Dover), 848s 907 (848s Ruth Lake), 848s 908 (848s Ruth Lake) 848S Ruth Lake Sub rebuild/upgrade protection to IEC 61850 - Cut over to new protection: 907CT,907,907B,9L58D2,908PT,908B,908,908CT.  

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: 2023-12-13   17:01:52


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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