Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2020-02-29

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 18-Feb-20 09:00 27-Mar-20 16:00 38.25 Days
Continuous		 9L100 (801s Anderson - 807s Sheerness), 807s 902 (807s Sheerness), 807s 902T (807s Sheerness) maintenance & 9L100 protection upgrade  
ALTALINK 18-Feb-20 12:00 08-Mar-20 18:30 19.23 Days
Continuous		 310p T30 (310p Sundance) corrosive sulphur mitigation  
ATCO 24-Feb-20 08:00 01-Mar-20 17:00 6.38 Days
Continuous		 7L59 (789s Keg River - 7L59 tap) FAC-008 line to ground mitigation  
Syncrude 24-Feb-20 08:00 17-Mar-20 20:00 22.46 Days
Continuous		 Mildred T3 (Syncrude Mildred Lake) de-energize temporary transformer to install new transformer T3  
ALTALINK 24-Feb-20 09:00 03-Mar-20 18:00 8.38 Days
Continuous		 912L/9L912 (63s - A766s Nevis) GOI Urgent Line Clearance on 912L due to public safety hazard in high wind conditions.  
ALTALINK 26-Feb-20 08:30 04-Mar-20 16:45 7.34 Days
Continuous		 443L (55s Olds - 214s Innisfail) complete structure changes  
ATCO 29-Feb-20 09:00 04-Mar-20 15:00 4.25 Days
Continuous		 7L32 Line Mitigation  
EPCOR 02-Mar-20 07:00 06-Mar-20 17:00 4.42 Days
Continuous		 Poundmaker S/S 930L Outage Outage to 930L required for relay maintenance and op-checks  
EPCOR 02-Mar-20 08:00 02-Mar-20 17:00 9 Hours
Continuous		 Cloverbar S/S 921L bay outage Relay maintenance and op-checks to 921L protection  
ATCO 02-Mar-20 08:00 22-Mar-20 17:00 20.33 Days
Continuous		 7L64 Contractor replacing structures and crossarms  
ATCO 02-Mar-20 09:00 11-Mar-20 17:00 9.29 Days
Continuous		 7L63 (788s Hotchkiss - 783s Cadotte River) 7L63 crossarm replacements  
ALTALINK 02-Mar-20 12:15 05-Mar-20 17:45 3.23 Days
Continuous		 794L (157s-A819s) - GOI 794L Components Replacements Str's 9-258  
ALTALINK 04-Mar-20 07:30 04-Mar-20 17:30 10 Hours
Daily		 370s T5(TX18510) GOI replace diverter lid/gear box and replace oil in diverters  
EPCOR 04-Mar-20 08:00 04-Mar-20 17:00 9 Hours
Continuous		 Cloverbar S/S Tx2 outage Relay maintenance and op-checks to Tx2 protection . Outage will affect Tx4 on Cloverbar POD S/S.  
ALTALINK 06-Mar-20 07:00 15-Mar-20 17:30 9.4 Days
Continuous		 948L (650s-A863s) - GOI 948L Component Replacements  
ATCO 09-Mar-20 03:00 24-Mar-20 08:30 15.23 Days
Continuous		 859s 701T (859s Primrose) maintenance  
EPCOR 09-Mar-20 07:00 10-Mar-20 17:00 1.42 Days
Continuous		 Jasper S/S J240C1 Cap bank outage Relay maintenance op-checks  
EPCOR 09-Mar-20 07:00 14-Mar-20 17:00 5.42 Days
Continuous		 Genesee S/S 12TC1 outage Relay repair/maintenance op-checks  
ENMAX 09-Mar-20 09:00 12-Mar-20 15:00 3.25 Days
Continuous		 Altalink outage. TAU CAP VOLT TR 60S100 138kV PT Replacement  
ATCO 09-Mar-20 09:00 13-Mar-20 16:00 4.29 Days
Continuous		 755s 903 (755s Cordel) Repair leaks on Breaker & Top off SF6, require manufacturer representative on site  
EPCOR 09-Mar-20 09:30 11-Mar-20 17:00 2.31 Days
Continuous		 TX#1 and 909LE Outage to TX#1 required for relay mtce op-checks and installation of new 240 KV breaker  
ATCO 10-Mar-20 08:00 12-Mar-20 16:00 2.33 Days
Continuous		 7L46 Raise Structures for Line mitigation, Associated with 7L45 HOP # 2-51167  
EPCOR 11-Mar-20 07:00 11-Mar-20 11:00 4 Hours
Continuous		 Jasper S/S J2403 breaker outage Relay maintenance op-checks  
EPCOR 11-Mar-20 12:00 11-Mar-20 17:00 5 Hours
Continuous		 Jasper S/S J2404 breaker outage Relay maintenance op-checks  
EPCOR 12-Mar-20 07:00 12-Mar-20 11:00 4 Hours
Continuous		 Jasper S/S J2405 breaker outage Relay maintenance op-checks  
EPCOR 13-Mar-20 07:00 13-Mar-20 11:00 4 Hours
Continuous		 Jasper S/S J2406 breaker outage Relay maintenance op-checks  
ATCO 13-Mar-20 08:00 17-Mar-20 16:00 4.33 Days
Continuous		 7L45 Raise Structures for mitigation, Associated with 7L46 HOP # 2-51164  
EPCOR 16-Mar-20 07:00 20-Mar-20 17:00 4.42 Days
Continuous		 Genesee S/S 12TC2 outage Relay maintenance op-checks  
ALTALINK 16-Mar-20 08:00 20-Mar-20 13:00 4.21 Days
Continuous		 901L(63s-64s-74s) - Advice 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. Line outage and protection upgrade only  
ATCO 16-Mar-20 08:00 20-Mar-20 16:00 4.33 Days
Continuous		 7L28 701 BKR and Ct maintenance 7L28 will be open at 846S

Relay protection upgrade panel 7l28 (panel 1c)
86-50BF/700BS1 partial install/testing (panel 1c)
Install new relay (21A-Siemens)
Change CT cores going to relays (701CT work)
Demo metering from ION 7300, metering will be done through SEL relay after.
Commission wiring/relays/CT-ratios		  
ALTALINK 16-Mar-20 09:00 19-Mar-20 18:00 3.38 Days
Continuous		 909L (310p - E665s) - GOI Components/Structure Replacements (Structures #59, 60, 61, 79, 80, 81, 151)  
ALTALINK 17-Mar-20 08:00 17-Mar-20 17:30 9.5 Hours
Daily		 63sT1 (Tx 18310) & 63s24 GOI CB 1480 (63S24) SF6 138KV DT1 Breaker Maintenance  
ALTALINK 18-Mar-20 08:00 18-Mar-20 17:30 9.5 Hours
Daily		 63sT2 (Tx 18898) & 63s25 GOI CB 1478 (63S25) SF6 138KV DT1 Breaker Maintenance  
ALTALINK 18-Mar-20 08:30 18-Mar-20 17:00 8.5 Hours
Daily		 336s612 (612L) GOI 138kV breaker maintenance  
ATCO 18-Mar-20 09:00 21-Mar-20 16:00 3.29 Days
Continuous		 7L50 crew do some conductor sampling on 7L50 , which means that I have to splice out some fairly large pieces of conductor.  
BCH 19-Mar-20 07:00 19-Mar-20 18:00 11 Hours
Continuous		 1L274 (B1s BCH Natal - 1D1L274) disconnect inspection AB-BC
ENMAX 19-Mar-20 08:00 19-Mar-20 12:00 4 Hours
Continuous		 28.80L. 28.2TR. 28PT138-Z31 Spring Substation Washing  
ALTALINK 21-Mar-20 07:00 30-Mar-20 18:00 9.46 Days
Continuous		 948L (650s-A863s) - GOI 948L Component Replacements  
EPCOR 23-Mar-20 07:00 23-Mar-20 17:00 10 Hours
Continuous		 Genesee S/S 1202 breaker outage Relay maintenance op-checks  
ALTALINK 23-Mar-20 08:00 24-Mar-20 18:00 1.42 Days
Continuous		 936L (5s - 102s) GOI Line Clearance Mitigation Insulators 936L50 Double circuit 937L  
ATCO 23-Mar-20 08:00 27-Mar-20 16:00 4.33 Days
Continuous		 7L24 ISOLATE 702 FOR THE FOLLOWING WORK TO COMMENCE:
RELAY PROTECTION UPGRADE PANEL 7L24 (PANEL 2C)
86-50BF/700BS1 PARTIAL INSTALL/TESTING (PANEL 2C)
INSTALL NEW RELAY (21A-SIEMENS)
CHANGE CT CORES GOING TO RELAYS (702CT WORK)
DEMO METERING FROM ION 7300, METERING WILL BE DONE THROUGH SEL RELAY AFTER.
COMMISSION WIRING/RELAYS/CT-RATIOS		  
ATCO 23-Mar-20 08:00 05-Apr-20 17:00 13.38 Days
Continuous		 7L64 Contractor replacing structures and crossarms
Note: this work is dependant on frozen ground to proceed.		  
ENMAX 23-Mar-20 08:00 24-Apr-20 16:00 32.33 Days
Continuous		 162.81L Line Protection Upgrade. (Original outage date Feb 3rd)  
ALTALINK 23-Mar-20 08:30 25-Mar-20 16:30 2.33 Days
Continuous		 415S Drywood maintenance  
ATCO 23-Mar-20 09:30 23-Mar-20 16:30 7 Hours
Continuous		 7L73 maintenance  
ALTALINK 23-Mar-20 09:30 23-Mar-20 17:30 8 Hours
Daily		 212s461 (461L) GOI 138kV breaker maintenance  
ALTALINK 23-Mar-20 11:00 24-Mar-20 17:00 30 Hours
Continuous		 370s51 GOI Settings Changes of Sync Check and Functional Testing on 370s51 CUH90 relay.  
EPCOR 24-Mar-20 07:00 24-Mar-20 17:00 10 Hours
Continuous		 Genesee S/S 1205 breaker outage Relay maintenance op-checks  
ALTALINK 24-Mar-20 07:30 24-Mar-20 17:30 10 Hours
Daily		 212s423 (423L) GOI 318kV breaker maintenance  
ALTALINK 24-Mar-20 08:15 24-Mar-20 17:15 9 Hours
Daily		 44s36.81E (36.81L) GOI 138kV breaker maintenance  
ALTALINK 24-Mar-20 09:00 25-Mar-20 15:00 30 Hours
Continuous		 1082L (63s-287s) - Advice Modify synch check logic on breaker 63S2752 and remove PLC reclosing on 63S2652. Test L7 – 1082L reclosing and synch logic after completing modifications.  
EPCOR 25-Mar-20 07:00 25-Mar-20 17:00 10 Hours
Continuous		 Genesee S/S 1208 breaker outage Relay maintenance op-checks  
ALTALINK 25-Mar-20 07:00 26-Mar-20 18:00 1.46 Days
Continuous		 937L (5s - 102s) GOI Line Clearance Mitigation Insulators 936L50 Double circuit 936L  
ALTALINK 25-Mar-20 08:15 25-Mar-20 17:15 9 Hours
Daily		 44s50X (50L) GOI 138kV breaker maintenance  
ALTALINK 25-Mar-20 11:00 26-Mar-20 17:00 30 Hours
Continuous		 275s2 GOI Settings Changes of Sync Check and Functional Testing on 275s2 CUH90 relay.  
ENMAX 26-Mar-20 08:00 26-Mar-20 12:00 4 Hours
Continuous		 693L. 10.2TR. 10PT138-Z31 Substation Washing  
ENMAX 26-Mar-20 12:00 26-Mar-20 18:00 6 Hours
Continuous		 832L. 10.1TR. 10PT138-Z31 Substation Washing  
EPCOR 30-Mar-20 08:00 31-Mar-20 16:00 1.33 Days
Continuous		 BR721 and TX#1 Doble Testing and Breaker Mtce  
EPCOR 30-Mar-20 09:00 30-Mar-20 14:30 5.5 Hours
Continuous		 CDS20 @ Cloverbar substation Repair of disconnect switch  
ATCO 30-Mar-20 09:00 02-Apr-20 14:00 3.21 Days
Continuous		 7L22 Customer road move for county of Grande Prairie  
ATCO 30-Mar-20 09:30 02-Apr-20 17:00 3.31 Days
Continuous		 827S SVC perform testing on 703T, and other equipment.SVC will be offline  
ALTALINK 30-Mar-20 11:00 31-Mar-20 17:00 30 Hours
Continuous		 163s1252(1011L) GOI Settings Changes of Sync Check and Functional Testing on 163s1252 CUH90 relay.  
ENMAX 30-Mar-20 12:00 30-Mar-20 18:00 6 Hours
Continuous		 23.80L. 23.4TR Spring Substation Washing  
ALTALINK 30-Mar-20 12:30 02-Apr-20 17:00 3.19 Days
Continuous		 650s752 - GOI Techs to fix nitrogen gas leak on 650s752  
ATCO 30-Mar-20 13:00 03-Apr-20 12:00 3.96 Days
Continuous		 7L113 Line inspection and insulator change  
ALTALINK 30-Mar-20 13:30 02-Apr-20 16:00 3.1 Days
Continuous		 28s52 GOI 240 kV CT replacement (28s52)  
EPCOR 31-Mar-20 09:00 31-Mar-20 17:00 8 Hours
Continuous		 1058L between Lambton and Summerside substations Replacement of surge arrestor counter  
EPCOR 01-Apr-20 08:00 02-Apr-20 15:00 31 Hours
Continuous		 BR722 and TX#2 Doble Testing and Breaker Mtce  
ENMAX 01-Apr-20 08:00 02-Apr-20 18:00 1.42 Days
Continuous		 771L HV SW maint SW84, SW85, MD-771L  
ENMAX 01-Apr-20 08:00 02-Apr-20 18:00 1.42 Days
Continuous		 771L. 47.1TR. 47.2TR Spring Substation Washing. 47s. Backfeed 47s SSTR through 25kV .  
ATCO 01-Apr-20 08:00 24-Apr-20 17:00 23.38 Days
Continuous		 757S 912T, 9L80 Add 59N Protection to 912T Tertiary Winding, 9L80 will be out of service  
ALTALINK 01-Apr-20 11:00 02-Apr-20 17:00 30 Hours
Continuous		 163s1352(1011L) GOI Settings Changes of Sync Check and Functional Testing on 163s1352 CUH90 relay.  
ALTALINK 02-Apr-20 08:00 02-Apr-20 17:00 9 Hours
Daily		 733L (428s - 151s) GOI Jumper 733L to 886L to allow future work at 428s  
EPCOR 02-Apr-20 09:00 02-Apr-20 14:30 5.5 Hours
Continuous		 J2408 breaker at Jasper substation Repair spring charging indicator  
EPCOR 03-Apr-20 08:00 03-Apr-20 16:00 8 Hours
Continuous		 C2407 @ Clover Bar Doble Testing  
EPCOR 03-Apr-20 09:00 03-Apr-20 14:30 5.5 Hours
Continuous		 LDS4 disconnect at Lambton substation Repair difficult to close condition  
ALTALINK 04-Apr-20 08:00 08-Apr-20 17:00 4.38 Days
Continuous		 428s Station (733L, PCES01L) GOI 138kV protection upgrade (138kV bus, 733L north, 733L south, 886L, PCES01L (coordinated with Cavalier protection upgrade)). T1(TX18578) protection upgrade, LA replacement, bird cover, doble/maintenance. Control building upgrades.  
EPCOR 06-Apr-20 09:30 06-Apr-20 16:00 6.5 Hours
Continuous		 915L Doble Testing  
ATCO 06-Apr-20 10:00 09-Apr-20 15:00 3.21 Days
Continuous		 7L40 7L40 Xarm/Insulator Replacement  
ALTALINK 06-Apr-20 11:00 07-Apr-20 17:00 30 Hours
Continuous		 163s1552(1002L) GOI Settings Changes of Sync Check and Functional Testing on 163s1552 CUH90 relay.  
ALTALINK 08-Apr-20 11:00 09-Apr-20 17:00 30 Hours
Continuous		 163s1752(1002L) GOI Settings Changes of Sync Check and Functional Testing on 163s1752 CUH90 relay.  
EPCOR 09-Apr-20 08:00 10-Apr-20 16:00 1.33 Days
Continuous		 947L Doble Testing  
ATCO 13-Apr-20 08:00 27-Apr-20 16:00 14.33 Days
Continuous		 740S 705, 7L80 (740s H.R.Milner - 733s Simonette) replace 705 PT and 705 CT
7L80 required open ended for the duration		  
ALTALINK 14-Apr-20 09:00 01-May-20 18:00 17.38 Days
Continuous		 180L (255s - 928s) - GOI OPGW install for the Claresholm project. 180L ( Str range 1- 204)  
EPCOR 17-Apr-20 07:00 19-Apr-20 17:00 2.42 Days
Continuous		 711L / 747L 711L4 Air Break - Replacement  
ENMAX 20-Apr-20 08:00 22-Apr-20 12:00 2.17 Days
Continuous		 65.1TR T-60 Upgrade Phase 2. Oil sampling MT, TC, Check reversing switch. Replace Switch Mech SW135, SW141  
ATCO 20-Apr-20 09:00 24-Apr-20 16:00 4.29 Days
Continuous		 755S 903 Repair leaks on Breaker, require manufacturer representative on site.

Ring bus will be opened		  
ALTALINK 20-Apr-20 09:00 02-May-20 18:00 12.38 Days
Continuous		 71s T1 (Tx 18357) - GOI Crews will be replacing the HV & LV bushings; some minor maintenance work will also be completed if time exists  
ATCO 20-Apr-20 11:00 24-Apr-20 14:00 4.13 Days
Continuous		 749S 703PT, 7L33 749S 703PT PCB PT replacement - Cat 1 2020

7L33 open ended; Ring bus will be open		  
ALTALINK 20-Apr-20 12:00 23-Apr-20 17:00 3.21 Days
Continuous		 268s T1 and VR1 - GOI High and low side bushings replacement on T1  
ENMAX 22-Apr-20 12:00 24-Apr-20 16:00 2.17 Days
Continuous		 65.2TR T-60 Upgrade Phase 2. Oil sampling MT, TC. Check reversing switch. Replace switch mech. SW130, SW136  
EPCOR 25-Apr-20 07:00 26-Apr-20 17:00 1.42 Days
Continuous		 711L / 747L 711L4 Air Break Replacement  
ALTALINK 27-Apr-20 06:00 06-May-20 18:00 9.5 Days
Continuous		 1241L/12L41 (510s - A939s) - GOI Cleaning up deficiencies from the project  
EPCOR 27-Apr-20 07:00 27-Apr-20 17:00 10 Hours
Continuous		 P2401 Doble and Breaker Mtce  
ATCO 27-Apr-20 09:00 27-Apr-20 12:00 3 Hours
Continuous		 755S 901 PRC-005 - TRIP & CLOSE COIL TESTING - BREAKER 901-WEST @ 755S

RING BUS WILL BE OPENED		  
ATCO 27-Apr-20 12:30 27-Apr-20 16:00 3.5 Hours
Continuous		 755S 902 PRC-005 - TRIP & CLOSE COIL TESTING - BREAKER 902-WEST @ 755S

RING BUS WILL BE OPENED		  
ALTALINK 28-Apr-20 07:00 29-Apr-20 17:30 1.44 Days
Continuous		 33s 138kV Bus (76L, 84L, 113L) GOI 33sSS1/33s5 arcing (when opening 33s5 witnessed an arc from the opening blade of 33s5 to the head of SS1), SS1 (120V secondary cables of the SS PT have arced to clamps; reinsulate cables), 33s83 middle phase does not close  
ALTALINK 28-Apr-20 07:00 29-Apr-20 17:30 1.44 Days
Continuous		 33s5 (33s Spray) Pole replacement, changing insulators and reconductor. 138kV breaker maintenance (33s1)  
ENMAX 28-Apr-20 08:00 28-Apr-20 16:00 8 Hours
Continuous		 23.80L HV breaker maintenance 23B138-23.80  
ATCO 28-Apr-20 09:00 28-Apr-20 12:00 3 Hours
Continuous		 755S 904 PRC-005 - TRIP & CLOSE COIL TESTING - BREAKER 904-WEST @ 755S

RING BUS WILL BE OPENED		  
ATCO 28-Apr-20 12:30 28-Apr-20 16:00 3.5 Hours
Continuous		 755S 905 PRC-005 - TRIP & CLOSE COIL TESTING - BREAKER 905-WEST @ 755S

RING BUS WILL BE OPENED		  
ATCO 29-Apr-20 09:00 29-Apr-20 12:00 3 Hours
Continuous		 755S 906 PRC-005 - TRIP & CLOSE COIL TESTING - BREAKER 906-WEST @ 755S

RING BUS WILL BE OPENED		  
EPCOR 04-May-20 08:00 15-May-20 17:00 11.38 Days
Continuous		 TX2 at Petrolia Substation Replace Secondary Cables  
BCH 04-May-20 09:00 15-May-20 17:00 11.33 Days
Continuous		 5L98 (BCH Nicola - Vaseux Lake) clearance required to replace end of life insulators AB-BC
ALTALINK 06-May-20 08:30 07-May-20 17:30 1.38 Days
Continuous		 250p T2 (Tx 18227) GOI CB 779 (250P2) MO 138KV HPF Breaker Maintenance.  
ENMAX 07-May-20 08:00 22-May-20 18:00 15.42 Days
Continuous		 36.81L. Haskayne line raise project. Raising the line and replacing 4 structures to accommodate a new road construction.  
ENMAX 11-May-20 08:00 24-May-20 16:00 13.33 Days
Continuous		 162.1TR B protection upgrade. Commission new circuits. HV SW maint SW131, SW141, SW81, SW96, MD138-162.1TR, MD240-162.1TR. Oil sampling 162.1 MT, TC, Bushing. Replace sw mech SW131, SW141. Check reversing sw.  
ALTALINK 11-May-20 12:00 15-May-20 14:00 4.08 Days
Continuous		 909L (89s - E665s) - GOI Components/Structure Replacements (Structures #218 - 228)  
ATCO 12-May-20 08:00 14-May-20 16:00 2.33 Days
Continuous		 801S 901T 801S Anderson 901T Oil Reclaiming
Will also be changing 14.4 KV PT and doing BKR 704 maintenance at the same time		  
ATCO 12-May-20 08:00 19-May-20 16:00 7.33 Days
Continuous		 743S 502VR, 743S 702T Adding Razor Energy DG at Sarah Lake  
ALTALINK 19-May-20 12:00 22-May-20 14:00 3.08 Days
Continuous		 909L (89s - E665s) - GOI Components/Structure Replacements (Structures #218 - 228)  
EPCOR 21-May-20 07:00 22-May-20 17:00 1.42 Days
Continuous		 Genesee 1204 Breaker Doble and Breaker Mtce  
ENMAX 25-May-20 08:00 25-May-20 12:00 4 Hours
Continuous		 65B240-D131 SF6 sample  
ATCO 25-May-20 08:00 07-Jun-20 16:00 13.33 Days
Continuous		 7L91 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ENMAX 25-May-20 12:00 25-May-20 16:00 4 Hours
Continuous		 65B240-D130 SF6 Sample  
ALTALINK 25-May-20 12:00 29-May-20 14:00 4.08 Days
Continuous		 909L (310p - E665s) - GOI Components/Structure Replacements (Structures #1B - 214)  
ENMAX 26-May-20 08:00 26-May-20 12:00 4 Hours
Continuous		 65B240-D132 SF6 Sample  
ENMAX 26-May-20 12:00 26-May-20 16:00 4 Hours
Continuous		 65B240-D133 SF6 sample  
ENMAX 27-May-20 08:00 27-May-20 16:00 8 Hours
Continuous		 65B240-D134 SF6 sample. Counter Repair Near and Center Phases  
ENMAX 01-Jun-20 08:00 01-Jun-20 16:00 8 Hours
Continuous		 693L HV Breaker Maintenance 10B138-693. SF6 sample. 10B138-693 - cabinet heater alarm  
ATCO, ALTALINK 01-Jun-20 08:00 05-Jun-20 17:00 4.38 Days
Continuous		 951s 1201T (951s Thickwood Hills), 951s 1206 (951s Thickwood Hills), 951s 1205 (951s Thickwood Hills), 951s 1213 (951s Thickwood Hills), 951s 1207 (951s Thickwood Hills), 951s 1214 (951s Thickwood Hills), 951s 1216 (951s Thickwood Hills), 951s 1213R (951s Thickwood HIlls), 12L41 (510s Sunnybrook - 939s Livock) Class 1 transformer major testing and operation checks  
ENMAX 01-Jun-20 08:00 10-Jul-20 16:00 39.33 Days
Continuous		 24.83L GT68 Transmission Line Relocate. Phasing required on return  
ALTALINK 01-Jun-20 09:00 02-Jul-20 18:00 31.38 Days
Continuous		 50L (44s - 21s) GOI Structures Range 131-143. Modifications on 131-132. New Self Supporting Steel Dead end structures at 133-134. New Dead End H-Frame structures at 141-143. Structure 142 to be salvaged.  
ALTALINK 01-Jun-20 09:30 04-Jun-20 16:30 3.29 Days
Continuous		 510s1152 (ACF 11) - GOI Annual inspection & maintenance  
ALTALINK 02-Jun-20 07:00 02-Jun-20 19:00 12 Hours
Continuous		 745AL (745L480-411s745A-975s1-745L482 - Urgent Fire Mitigation. Scope of work includes maintenance on Structures 745A1L957s Dalehurst East Bay And 745ALJCT-745AL3 & 745A1L1 and Str 9 on 740AL Scheduled: Shannon Bouchard Issue To: Ken Teasdale Contact #: 403.360.4960  
ENMAX 02-Jun-20 08:00 02-Jun-20 16:00 8 Hours
Continuous		 832L HV breaker maintenance 10B138-832L. SF6 sample  
EPCOR 08-Jun-20 07:00 12-Jun-20 17:00 4.42 Days
Continuous		 TX1 @ Castledowns MV protection cutover  
ALTALINK 08-Jun-20 07:00 16-Jun-20 18:00 8.46 Days
Continuous		 77s T1, 240kV & 138kV West Bus - GOI Replace T1 'A', T1 'B', 240B1 Protections  
ALTALINK 08-Jun-20 07:30 11-Jun-20 16:30 3.38 Days
Continuous		 511s1252 (ACF 11) - GOI Annual inspection & maintenance  
ATCO 08-Jun-20 08:00 21-Jun-20 16:00 13.33 Days
Continuous		 7L89 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ALTALINK 09-Jun-20 08:00 09-Jun-20 19:00 11 Hours
Daily		 907L (77s-122s) - GOI Replace 96/1752  
ALTALINK 11-Jun-20 08:00 14-Jun-20 17:00 3.38 Days
Continuous		 202L (62s-61s)- GOI Fire Mitigation / Maintenance on Strs 137, 138, 139, 141, 156 and 163  
ATCO 14-Jun-20 08:00 14-Jun-20 17:00 9 Hours
Continuous		 7L15 CNOOC will be completing a PM on the main disconnect switch (7L15D2) to our site, this job will require an isolation from Atco and a guarantee of isolation to be in place.

As well we’ll like to complete a quick Islanding trip test.		  
ALTALINK 15-Jun-20 08:00 15-Jun-20 17:00 9 Hours
Daily		 733L (428s - 151s) GOI Remove Jumper from 733L to 886L  
ALTALINK 15-Jun-20 09:30 18-Jun-20 16:30 3.29 Days
Continuous		 510s2152 (ACF 21) - GOI Annual inspection & maintenance  
ENMAX 19-Jun-20 08:00 19-Jun-20 18:00 10 Hours
Continuous		 985L. Power factor test HV LA 25MD240-985. replace switch mech. SW133, SW134  
ALTALINK 22-Jun-20 07:30 25-Jun-20 16:30 3.38 Days
Continuous		 511s2152 (ACF 21) - GOI Annual inspection & maintenance  
ATCO 22-Jun-20 08:00 05-Jul-20 16:00 13.33 Days
Continuous		 7L587 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 23-Jun-20 08:00 25-Jun-20 17:00 2.38 Days
Continuous		 848S 901T 901T Oil Reclaiming at 848S Ruth Lake  
ENMAX 29-Jun-20 08:00 30-Jun-20 18:00 1.42 Days
Continuous		 1080L. Power factor test HV LA 25MD240-1080. LA 65MD240-1080. Replace switch mech 25SW146, 25SW147, 65SW133, 65SW134  
ATCO 06-Jul-20 08:00 09-Jul-20 17:00 3.38 Days
Continuous		 7L24 Replacing Cross-Arms, Poles and Ground Rod's  
ATCO 06-Jul-20 08:00 30-Aug-20 16:00 55.33 Days
Continuous		 826S 902T 240/144kV Breaker Fail Protection
(902T OOS for duration of outages)

826S Marguerite P&C Upgrade		  
BCH 06-Jul-20 09:00 08-Jul-20 17:00 2.33 Days
Continuous		 5L51 (Ingledow - Custer) disconnect maintenance AB-BC
BCH 06-Jul-20 09:00 17-Jul-20 17:00 11.33 Days
Continuous		 2L293 (Selkirk - Nelway) structure replacement AB-BC
ALTALINK 06-Jul-20 12:00 17-Jul-20 14:00 11.08 Days
Continuous		 909L (310p - E665s) - GOI Components/Structure Replacements (Structures #1B - 214)  
SUNCOR 11-Jul-20 08:00 09-Aug-20 18:00 29.42 Days
Continuous		 29EDD-3 Line outage to perform 5/10yr PM 29PL9-3 29PT-6 AT GTG6:
29EDD-3;29PL9-3/GTG-6 15KVEQ SYSTEM;PM 5y,
29EDD-3 29PT-6 LEAKS - PRESSURE WASH		  
ATCO 13-Jul-20 08:00 16-Jul-20 17:00 3.38 Days
Continuous		 7L24 Replacing Cross-Arms, Poles and Ground Rod's  
ALTALINK 13-Jul-20 09:30 16-Jul-20 16:30 3.29 Days
Continuous		 510s1452 (ACF 14) - GOI Annual inspection & maintenance  
ATCO 20-Jul-20 08:00 23-Jul-20 17:00 3.38 Days
Continuous		 7L24 Replacing Cross-Arms, Poles and Ground Rod's  
BCH 20-Jul-20 08:30 23-Jul-20 16:00 3.31 Days
Continuous		 2L112 (Nelway - Boundary) bpa outage/BCH disconnect maintenance AB-BC
BCH 20-Jul-20 09:00 22-Jul-20 17:00 2.33 Days
Continuous		 2L113 (B1s Natal - B2s Cranbrook) disconnect maintenance AB-BC
ALTALINK 20-Jul-20 12:00 31-Jul-20 14:00 11.08 Days
Continuous		 909L (310p - E665s) - GOI Components/Structure Replacements (Structures #1B - 214)  
BCH 21-Jul-20 09:00 23-Jul-20 09:00 2 Days
Continuous		 1L275 (799s Coleman - Natal) markerball installation AB-BC
ENMAX 22-Jul-20 08:00 25-Jul-20 16:00 3.33 Days
Continuous		 21.80L Move double structures on Sarcee Trail.  
BCH 27-Jul-20 09:00 07-Aug-20 17:00 11.33 Days
Continuous		 2L294 (Cranbrook - A.A. Lambert) structure replacement & disconnect maintenance AB-BC
ENMAX 31-Jul-20 08:00 31-Jul-20 18:00 10 Hours
Continuous		 1003L Power factor test HV LA 25MD240-1003. Replace switch mech SW140, SW141  
ATCO 03-Aug-20 07:00 03-Nov-20 17:00 92.46 Days
Continuous		 972S 905B Halkirk 2 Windfarm Project  
EPCOR 10-Aug-20 07:00 21-Aug-20 17:00 11.42 Days
Continuous		 TX3 @ Jasper DGA monitor  
BCH 10-Aug-20 09:00 21-Aug-20 17:00 11.33 Days
Continuous		 5L96 (Selkirk - Vaseux Lake) arcing horn replacement & insulator replacement AB-BC
ENMAX 24-Aug-20 08:00 06-Sep-20 16:00 13.33 Days
Continuous		 162.2TR (ENMAX 162 Beddington) Transformer differential relay replacement. Commission circuits. HV SW maint SW105, SW89, SW88, SW136, SW146, MD138-162.2TR, MD240-162.2TR. Oil sampling MT, TC, Bushings. Check reversing switch. Replace switch mech SW136  
ALTALINK 24-Aug-20 09:00 04-Sep-20 18:00 11.38 Days
Continuous		 1201L (520s - B2s) GOI Structure range 187-508 Component's and Fire Mitigation( 95050674) AB-BC
EPCOR 31-Aug-20 07:00 25-Sep-20 17:00 25.42 Days
Continuous		 TX4 @ Jasper Bushing Replacement & Oil Work  
ATCO 31-Aug-20 08:00 25-Oct-20 16:00 55.33 Days
Continuous		 826S 901T 240/144kV Breaker Fail Protection
(901T OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 01-Sep-20 08:00 14-Sep-20 12:00 13.17 Days
Continuous		 731S 701T, 7L03 731S Elmworth Bkr Replacement and Protection Upgrade

Outgae on 701T/7L03 (Isolation points - 501VRA, 501VRB,
501VRX, 700D1, 7L03D4, TBD for mobile sub on 25 kV bus)		  
ALTALINK 08-Sep-20 09:00 11-Sep-20 18:00 3.38 Days
Continuous		 1201L (520s - B2s) GOI Structure range 187-508 Component's and Fire Mitigation( 95050674)  
ALTALINK 14-Sep-20 08:00 27-Sep-20 18:00 13.42 Days
Continuous		 1325L (510s - 511s) - GOI Annual inspection & maintenance  
SUNCOR 14-Sep-20 09:00 20-Sep-20 18:00 6.38 Days
Continuous		 29EDD-1 5yr and 10 yr maintenance on 29CTT-1 in 29EDD-1

Elements not available:
29CVT-1, 29PL9-2		  
ATCO 14-Sep-20 12:01 28-Sep-20 16:00 14.17 Days
Continuous		 7L69 731S Elmworth Bkr Replacement and Protection Upgrade

Outage on 7L69		  
EPCOR 21-Sep-20 07:00 25-Sep-20 17:00 4.42 Days
Continuous		 1044L east @ Jasper - Petrolia Vt Replacement  
ALTALINK 28-Sep-20 06:15 16-Oct-20 17:45 18.48 Days
Continuous		 777L (48s - 245s) GOI Maintenance and Structure replacements (Str 15 - 226) AB-BC
ATCO 28-Sep-20 07:00 29-Sep-20 17:00 1.42 Days
Continuous		 9L62 Installing new 240Kv Bay for 620S Goldeye substation connection
String 9L62 into 972S Tinchebray		  
ATCO 28-Sep-20 08:00 02-Oct-20 17:00 4.38 Days
Continuous		 840S CONVERTER 840S McNeill Fall 2020 Outage

PRC-005 Maintenance		 AB-SK
SUNCOR 28-Sep-20 08:00 05-Oct-20 18:00 7.42 Days
Continuous		 29EDD-56 PL9-15 OUTAGE 5YR SYSTEM PM, 29PT-190 AND BREAKER 652-4110:
29EDD-56;29PT-190 SYSTEM;PM 5y,
29EDD-56;652-4110 MAINT & TEST;PM 10y,
Repair OHSW bonds to towers PL9-14/15
29EDD-56 Repair Leak 29PT-190		  
ENMAX 05-Oct-20 08:00 18-Oct-20 18:00 13.42 Days
Continuous		 7.82L. WCRR 101 Street Project  
ENMAX 09-Oct-20 08:00 12-Oct-20 16:00 3.33 Days
Continuous		 162s PT-Z41. 1-GSU-XF-0001 Replace 87-XF1 B differential protection. Commission checks and trip testing  
ENMAX 09-Oct-20 08:00 12-Oct-20 16:00 3.33 Days
Continuous		 162s. 1-GSU HV SW maint SW133, SW132. Replace switch mech. SW132, SW133  
EPCOR 13-Oct-20 07:00 23-Oct-20 17:00 10.42 Days
Continuous		 TX1 @ Petrolia DGA Install  
ATCO 26-Oct-20 08:00 08-Nov-20 16:00 13.38 Days
Continuous		 9L36 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
ATCO 09-Nov-20 08:00 23-Nov-20 16:00 14.33 Days
Continuous		 9L37 240/144kV Breaker Fail Protection
(OOS for duration of outages)

826S Marguerite P&C Upgrade		  
EPCOR 16-Nov-20 07:00 27-Nov-20 17:00 11.42 Days
Continuous		 CV5 @ Castledowns & Victoria maint and splice repair  
EPCOR 23-Nov-20 07:00 27-Nov-20 17:00 4.42 Days
Continuous		 TX2 @ Castledowns TX protection cutover  
ATCO 05-Dec-20 07:00 11-Dec-20 16:00 6.38 Days
Continuous		 9L59 Outage for Garden Plain Wind Project  
ATCO 15-Dec-20 07:00 23-Dec-20 17:00 8.42 Days
Continuous		 730S 702, 730S 704 SVC addition and 144 kv bus rebuild.  
ATCO 05-Jan-21 08:00 08-Jan-21 16:00 3.33 Days
Continuous		 9L20 56772 Nevis Transformer Addition
9L20 Open -ended		  
ATCO 09-Jan-21 08:00 12-Jan-21 16:00 3.33 Days
Continuous		 9L912 56772 Nevis Transformer Addition
9L912 Open -ended		  
ATCO 20-Jan-21 08:00 23-Feb-21 16:00 34.33 Days
Continuous		 951S 900BS2, 951S 908, 951S 906, 951S 903 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 25-Jan-21 08:00 26-Jan-21 16:00 1.33 Days
Continuous		 766S 901T, 9L20, 9L912 56772 Nevis Transformer Addition
Tie-in to the new bus for 902T
901T OOS
9L20 OPEN-ENDED
9L912 OPEN-ENDED		  
ATCO 03-Feb-21 07:00 07-Feb-21 17:00 4.42 Days
Continuous		 9L101 Line move for mine expansion.
Attach new line to existing 9L101		  
ATCO 15-Feb-21 07:00 02-Mar-21 17:00 15.42 Days
Continuous		 972S 900BS2, 9L16 Outage on 907B and 908A for the installation and commissioning of 907 and 907CT  
ATCO 22-Feb-21 08:00 22-Feb-21 18:00 10 Hours
Continuous		 7L65, 7L77 String over 7L65 and 7L77  
ATCO 24-Feb-21 08:00 26-Feb-21 16:00 2.33 Days
Continuous		 951S 900BS1 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		  
ATCO 01-Mar-21 07:00 02-Mar-21 17:00 1.42 Days
Continuous		 972S 900BS2, 9L16 Outage on 9L16 to cut the line over to the new bay  
ATCO 08-Mar-21 07:00 12-Mar-21 17:00 4.42 Days
Continuous		 9L177 Installing new 240Kv Bay (connect 907B to BUS 1) for 620S Goldeye substation connection  
ATCO 04-May-21 08:00 17-May-21 17:00 13.38 Days
Continuous		 9L02 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 24-May-21 08:00 06-Jun-21 17:00 13.38 Days
Continuous		 9L40 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.		  
ATCO 14-Jun-21 08:00 27-Jun-21 17:00 13.38 Days
Continuous		 9L05 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.		  
ATCO 29-Jun-21 08:00 29-Jun-21 16:00 8 Hours
Continuous		 7LA53 Install new 7LA53 deadend for prepping New Line Addition 7L208  
ATCO 05-Jul-21 08:00 18-Jul-21 17:00 13.38 Days
Continuous		 9L939 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.		  
ATCO 26-Jul-21 08:00 28-Sep-21 17:00 64.38 Days
Continuous		 809S 902T, 9L938 Louise Creek Rebuild project
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.		  
ATCO 29-Jul-21 08:00 05-Aug-21 17:00 7.38 Days
Continuous		 7L91 P&C wiring and commissioning associated to 7L208 work  
ATCO 04-Oct-21 08:00 17-Oct-21 17:00 13.38 Days
Continuous		 809S 901T Louise Creek Rebuild project
Switch station service to alternate.
Replace bus PT 900PT1.
Complete wiring for BF, 87TA, 87TB, and 51NGR relays.
CT ratio changes.
Commission apparatus.
Relay programming.
Commission control, alarms and status.
Blocking procedures for BF and Bus protections.		  
ATCO 22-Mar-22 07:00 22-Mar-22 17:00 10 Hours
Continuous		 7L77 7L65 Rebuild Project  

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

Prepared On: 2020-02-19   2:58:49 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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