Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2018-10-27

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
ALTALINK 09-May-18 11:30 28-Feb-19 17:00 295.27 Days
Continuous		 902L (19s Wabamun - 310p Sundance) emergency safety requirement  
Syncrude 04-Oct-18 09:00 31-Mar-19 20:00 178.46 Days
Continuous		 Mildred T3 (Syncrude Mildred Lake) damaged transformer repairs  
BCH 21-Oct-18 15:00 11-Nov-18 14:00 21 Days
Continuous		 5L72 (Mica Creek - Nicola) switchgear roof replacement AB-BC
BCH 26-Oct-18 08:00 05-Nov-18 13:00 10.25 Days
Continuous		 Natal T3 (BCH Natal) 12CX3 OOS leak repair and 12 kv pin and cap replacement AB-BC
ENMAX 27-Oct-18 08:00 27-Oct-18 18:00 10 Hours
Continuous		 11.83L (162s Beddington - ENMAX 11),11.83L HV Breaker Maintenance  
ALTALINK 29-Oct-18 06:30 02-Nov-18 15:00 4.35 Days
Continuous		 17s 13 (17s Benalto) C60 Replacement and commissioning  
ATCO 29-Oct-18 07:00 29-Oct-18 17:00 10 Hours
Continuous		 7L07 (790s Poplar Hill - 815s Goodfare),7L07,815S 702 Protection upgrade  
ALTALINK 29-Oct-18 07:00 31-Oct-18 17:00 2.42 Days
Continuous		 320p400 GOI Metering upgrade.  
ALTALINK 29-Oct-18 07:00 31-Oct-18 17:00 2.42 Days
Continuous		 400L (320p Keephills - 320p Keephills) 320p 50 switch maintenance  
BCH 29-Oct-18 09:00 08-Nov-18 17:00 10.38 Days
Continuous		 1L274 (Britt Creek - 1D4L274) Rating Restoration project & replace end-of-life structures AB-BC
ATCO 29-Oct-18 10:00 31-Oct-18 14:00 2.17 Days
Continuous		 959s 906 (959s Lanfine) CT Ratio Changes and Associated Relay Changes, Associated with 906CT and 50BF/906 Relay  
ATCO 30-Oct-18 07:00 30-Oct-18 17:00 10 Hours
Continuous		 815S 704,7L69 Protection upgrade Advantage Oil & Gas Project

GOI ON 815S BKR 704		  
ALTALINK 30-Oct-18 07:00 02-Nov-18 18:00 3.46 Days
Continuous		 914L (86s - 87s) - GOI Component replacements between Structures #144 - 391  
ALTALINK 30-Oct-18 07:00 11-Nov-18 17:00 12.46 Days
Continuous		 15s 138kV Bus 1 (180L,463L) Advice 138kV Bus 1 Modifications: Salvage 138kV Mobile Sub Connection , Install piles and relocate 138kV Bus PT, Construct concrete pad for 138kV Tie Breaker, Relocate and Commission Tie Breaker (15s452), Relocate 138KV Switches (15s28, 15s29 --> 15s10, 15s11), String Line in between 138kV Bus 1 and Bus , Modification to existing protections  
ALTALINK 30-Oct-18 07:30 02-Nov-18 16:30 3.38 Days
Continuous		 86s T1 TX18491 - GOI replace X2 and x3 bushings  
ALTALINK 30-Oct-18 08:00 02-Nov-18 16:30 3.35 Days
Continuous		 63s T2 (63s Red Deer) Fix oil leaks on T2 Tx18898.  
ATCO 31-Oct-18 07:00 07-Nov-18 17:30 7.48 Days
Continuous		 9L01 (888s Dover - 848s Ruth Lake) 9L01 Cut in for in and out addition of 951S Thickwood Hills substation. Remove bypass at substation.  
ENMAX 31-Oct-18 08:00 01-Nov-18 16:00 1.33 Days
Continuous		 162s Z44 240KV Bus. 162.2TR,162.2TR (ENMAX 162 Beddington) Install replacement parts PT Z44  
EPCOR 01-Nov-18 07:00 01-Nov-18 17:00 10 Hours
Continuous		 805s J2404 (805s Jasper) Nait Tour  
ATCO 01-Nov-18 07:00 02-Nov-18 17:00 1.42 Days
Continuous		 853S 700D1,853s 702T (853s Ring Creek) Rewire SCADA Control and alarms to new station controller  
ALTALINK 01-Nov-18 10:30 01-Nov-18 15:30 5 Hours
Daily		 77s 51 (77s Sagitawah),77s51 GOI 77s51 Leaking HPL (North Phase)  
ALTALINK 02-Nov-18 15:00 02-Nov-18 16:00 60 Mins
Daily		 17s 12 (17s Benalto) Trip Test for C60 Replacement  
ALTALINK 03-Nov-18 07:00 03-Nov-18 09:00 2 Hours
Daily		 17s 16 (17s Benalto),17s C1 (17s Benalto) Trip Test for C60 Replacement  
ALTALINK 03-Nov-18 09:00 03-Nov-18 11:00 2 Hours
Daily		 17s 4 (17s Benalto) Trip Test for C60 Replacement  
ALTALINK 03-Nov-18 11:00 03-Nov-18 13:00 2 Hours
Daily		 17s 9 (17s Benalto) Trip Test for C60 Replacement  
ALTALINK 03-Nov-18 13:00 03-Nov-18 15:00 2 Hours
Daily		 17s 3 (17s Benalto) Trip Test for C60 Replacement  
ALTALINK 03-Nov-18 15:00 03-Nov-18 16:30 90 Mins
Daily		 17s 1652 (17s Benalto) Trip Test for C60 Replacement  
ALTALINK 03-Nov-18 16:30 03-Nov-18 18:00 90 Mins
Daily		 17s T2 (17s Benalto),17s 85 (17s Benalto),17s85 (T2) - GOI Trip Test for C60 Replacement  
ALTALINK 05-Nov-18 06:30 09-Nov-18 14:30 4.33 Days
Continuous		 17s 12 (17s Benalto) C60 Replacement and commissioning  
ALTALINK, EPCOR 05-Nov-18 07:00 08-Nov-18 16:00 3.38 Days
Continuous		 920L (37s North Calder - 557s Castle Downs) Upgrade TPR protection  
EPCOR 05-Nov-18 07:00 08-Nov-18 17:00 3.42 Days
Continuous		 920L-W Bay Outage @ E557S Castle Downs S/S Performing Teleprotection Update to Line Protection  
ENMAX 05-Nov-18 08:00 06-Nov-18 12:00 28 Hours
Continuous		 65.1TR Oil sampling MT, TC. Check reversing switch  
ALTALINK 05-Nov-18 09:00 15-Nov-18 16:00 10.29 Days
Continuous		 310p240 C Bus,T36 GOI,T30 Migrate and commission all T36, T30 & 310P69 protections, breaker, status, controls, alarms, metering and remote access to the new RTU and LAN. Replace 310P3089 & 310P3389 air break control modules, commission alarms control and status to new RTU. Replace T30 & T36 metering transducers with SEL-735 meters for SCADA metering of T30 & T36  
ALTALINK 05-Nov-18 09:30 09-Nov-18 14:30 4.21 Days
Continuous		 510s ACF22 GOI Outage and GOI required to repair oil leak on CT. Outage to 510s ACF22. Does not impact link dispatch.  
ALTALINK 05-Nov-18 11:00 05-Nov-18 17:00 6 Hours
Daily		 74s C3 (74s Janet),74s102(C3) Advice,74s 102 (74s Janet) Fix heaters  
ALTALINK 05-Nov-18 12:00 06-Nov-18 18:00 30 Hours
Continuous		 914L (86s Bigstone - 87s Gaetz) Component replacements between Structures #144 - 391  
BCH 05-Nov-18 13:01 13-Nov-18 17:00 8.17 Days
Continuous		 Natal T4 (BCH Natal) leak repair and 12 kv pin and cap replacement  
ALTALINK 06-Nov-18 08:00 06-Nov-18 17:00 9 Hours
Daily		 994L (103s Goose Lake - 312s Fidler) 994L outage for 103s552 and 652 low gas top up and investigate leak. 103s994 adjust switch.  
ALTALINK 06-Nov-18 08:00 07-Nov-18 17:00 1.38 Days
Continuous		 74s 103 (74s Janet),74s103(C4) Advice,74s C4 (74s Janet) Fix heaters and make some wiring changes.  
ENMAX 06-Nov-18 12:00 07-Nov-18 16:00 28 Hours
Continuous		 65.2TR Oil sampling MT, TC. Check reversing switch  
ALTALINK 07-Nov-18 07:00 08-Nov-18 18:00 1.46 Days
Continuous		 914L (87s Gaetz - 63s Red Deer) Component replacements between Structures #430 - 449  
ALTALINK 07-Nov-18 09:00 07-Nov-18 15:00 6 Hours
Daily		 324s 1652 (324s Cassils) Pole A1 heater burned out.  
ALTALINK 07-Nov-18 10:30 07-Nov-18 16:00 5.5 Hours
Daily		 356s552 - GOI Fix heaters  
ALTALINK 09-Nov-18 09:00 23-Nov-18 15:30 14.27 Days
Continuous		 247s 755 (247s Piper Creek),247s Piper Creek 138kV Bus,247s 427 (247s Piper Creek) 17-89-1 & 17-89-2 138kV Motor Operated Disconnect replacement  
ALTALINK 09-Nov-18 14:30 09-Nov-18 16:30 2 Hours
Daily		 17s 13 (17s Benalto) Trip Test for C60 Replacement  
ALTALINK 12-Nov-18 07:00 25-Nov-18 19:00 13.5 Days
Continuous		 1206L (89s Ellerslie - 12s Heartland),1206L (89s - 12s) - GOI Spacer and damper replacement  
ALTALINK 12-Nov-18 09:00 12-Nov-18 11:00 2 Hours
Daily		 17s 11 (17s Benalto) Trip Test for C60 Replacement  
BCH 12-Nov-18 09:00 16-Nov-18 17:00 4.33 Days
Continuous		 5L96 (Selkirk - Vaseux Lake) To Repair the failed operating mechanism on 5D42. AB-BC
ALTALINK, Lethbridge 12-Nov-18 13:00 14-Dec-18 14:00 32.04 Days
Continuous		 824L (593s Lethbridge Lakeview - 618s Riverbend) Install self-supporting structures  
ATCO 13-Nov-18 07:00 17-Nov-18 17:30 4.44 Days
Continuous		 7L77,7L65 Transfer line to new part of 706S Vegreville substation
7L65 and 77 Lines on a common H frame structure. Only 7L77 being moved at this time.		  
ALTALINK 13-Nov-18 07:15 22-Nov-18 15:45 9.35 Days
Continuous		 918L (281s - C162s) GOI component replacement, and installing interphase spacers on 918L circuit between str 763-796  
ATCO 13-Nov-18 08:00 15-Nov-18 16:00 2.33 Days
Continuous		 7L03 7L03 Line Maint  
BCH 13-Nov-18 09:00 23-Nov-18 17:00 10.33 Days
Continuous		 1L274 (Britt Creek - 1D4L274) Annual Plan Request F19 AB-BC
ALTALINK 13-Nov-18 09:15 29-Nov-18 17:45 16.35 Days
Continuous		 925L (63s Red Deer - 74s Janet) Maintenance Components (Str 117-404)  
ALTALINK 13-Nov-18 10:00 22-Nov-18 14:00 9.17 Days
Continuous		 310p 452 (310p Sundance),310p452 GOI Upgrade breaker fail protection.  
ATCO 14-Nov-18 07:00 21-Nov-18 17:30 7.44 Days
Continuous		 9L07,9L07 (888s Dover - 2011s Dawes) Cut in 951S Thickwood Hills substation.  
ALTALINK 14-Nov-18 09:00 14-Nov-18 19:00 10 Hours
Continuous		 526L/6L126 (526L418 - 526L420 - A743s) - Closing Open Points 'A' & 'B' and creating Open Points 'C' & 'D'  
ALTALINK 14-Nov-18 10:30 14-Nov-18 13:30 3 Hours
Daily		 132s 55 (132s Ware Junction),132s55 - GOI The 70 watt anticon heater on the west phase of 132s28 is burnt out. A new 70 watt HPL heater is required to replace the burnt out one.  
ALTALINK 14-Nov-18 13:30 14-Nov-18 16:30 3 Hours
Daily		 132s28 - GOI,132s 28 (132s Ware Junction) The 70 watt anticon heater on the west phase of 132s28 is burnt out. A new 70 watt HPL heater is required to replace the burnt out one.  
ALTALINK 14-Nov-18 19:00 05-Dec-18 09:00 20.58 Days
Continuous		 526L/6L126 (Open Point 'C' - Open Point Replacing 8703S1 with a new switch; this switch will be changing its designation to 126L1 and the small portion of line will be renamed to 126L  
ALTALINK 15-Nov-18 06:00 10-Dec-18 08:00 25.08 Days
Continuous		 510s2852 - GOI Installing new 510s2952, CT's, 510s46, 510s48 and protection; Closing Open Points 'A', 'B', 'D' & 'E'  
ALTALINK 16-Nov-18 12:00 16-Nov-18 17:00 5 Hours
Daily		 180L (15s-928s) GOI As 180L will be required OOS for 725L Outage (SAP 262031) and 824L contingencies, crew to salvage 180L shield wire crossing over 15sT2  
EPCOR 19-Nov-18 07:00 23-Nov-18 17:00 4.42 Days
Continuous		 TX1 @ Cloverbar oil filtration replacement and CDS25 commissioning  
EPCOR 19-Nov-18 10:00 22-Nov-18 15:00 3.21 Days
Continuous		 909L - West Line Maintenance & Upgrades - take advantage of the Altalink outage  
ALTALINK, EPCOR 19-Nov-18 10:00 22-Nov-18 16:00 3.25 Days
Continuous		 909L (310p - 665s) Advice,909L (310p Sundance - 665s Dome) Migrate and commission all L5 - 909L at 310P Sundance associated line protections, breakers, breaker fail and Tele-protection alarms, status, controls, metering and remote access to new RTU and LAN. Migrate and commission CVT-L5 alarms.  
ALTALINK 19-Nov-18 11:00 23-Nov-18 15:00 4.17 Days
Continuous		 719L (575s-378s) - GOI Upgrade 378s Shell Caroline Line Prot (A21/L4 & B21/L4).  
ALTALINK 19-Nov-18 13:00 22-Nov-18 14:30 3.06 Days
Continuous		 I_313s Station GOI Repair station grounding damaged by a copper theft incident. Affects 225L(67s-225s).  
ALTALINK 20-Nov-18 07:00 22-Nov-18 18:00 2.46 Days
Continuous		 491L (252s - 7L50) - GOI Component replacement work between Structures #1 - 4  
ALTALINK 20-Nov-18 09:30 20-Nov-18 17:30 8 Hours
Daily		 77s T1 (Tx18372) GOI 77s T1 Leaks CAT3 Now a CAT5  
ALTALINK 20-Nov-18 10:30 20-Nov-18 13:00 2.5 Hours
Daily		 61s836N (affects 836L) Advice,836L (61s Lodgepole - 283s Violet Grove) Trip testing from new 61s202X breaker fail protection.  
ALTALINK 21-Nov-18 07:00 21-Nov-18 18:00 11 Hours
Daily		 310p 240 kV B Bus GOI,310p Sundance 240kV Bus B Trip testing from new 310p452 breaker fail protection  
EPCOR 21-Nov-18 07:00 22-Nov-18 17:00 1.42 Days
Continuous		 L2403 BKR @ Lambton Transfer DC supply  
ALTALINK 22-Nov-18 14:00 22-Nov-18 17:30 3.5 Hours
Daily		 310p552 GOI,310p 552 (310p Sundance) Trip testing from 310p452. Keeps 919L in service.  
ALTALINK 26-Nov-18 06:30 06-Dec-18 15:30 10.38 Days
Continuous		 190L (17s Benalto - 320p Keephills) 17s1, 17s2 C60s, 190L A&B Line protections and 190L Air Brk Control Modules  
EPCOR 26-Nov-18 07:00 27-Nov-18 17:00 1.42 Days
Continuous		 L2404 BKR @ Lambton Transfer DC power supply  
EPCOR 26-Nov-18 07:00 28-Nov-18 17:00 2.42 Days
Continuous		 Tx1 Outage @ E52S East Industrial S/S Cutover of new relay protection.  
ATCO 26-Nov-18 07:00 28-Nov-18 17:30 2.44 Days
Continuous		 2075S ACF11 Switching for SVC1 Outage ACF11  
EPCOR 26-Nov-18 07:00 30-Nov-18 17:00 4.42 Days
Continuous		 TX2 @ Cloverbar TX@ Bushing monitor removal  
ALTALINK 26-Nov-18 07:00 09-Dec-18 19:00 13.5 Days
Continuous		 1212L (89s - 12s) - GOI,1212L (89s Ellerslie - 12s Heartland) Spacer and damper replacement  
EPCOR 26-Nov-18 07:30 30-Nov-18 17:00 4.4 Days
Continuous		 TX3 @ Jasper S/S Metering Cutover  
ATCO 26-Nov-18 08:00 29-Nov-18 16:00 3.33 Days
Continuous		 7L66,715S 7L66D1 715S 7L66D1 REPLACEMENT GROUND GRID MODIFICATIONS

Switch Replacement

7L66 OOS for duration of work,
846S and 940S will be radial fed from 700S , 717S radial from 846S for duration of the work		  
ATCO 26-Nov-18 08:00 29-Nov-18 16:00 3.33 Days
Continuous		 715S 7L91D2,7L91 715S 7L91D2 REPLACEMENT SWITCHING ONLY

Switch Replacement

7L91 OOS for duration of work		  
ALTALINK 26-Nov-18 08:30 27-Nov-18 17:00 1.35 Days
Continuous		 922L (310p - 17s) - GOI Component replacements on the A-frame slack span for 922L  
ALTALINK 26-Nov-18 08:30 28-Nov-18 15:30 2.29 Days
Continuous		 310p 240kV 'B' Bus - GOI Component replacements on the A-frame slack span for 922L & 926L  
ALTALINK 26-Nov-18 11:00 29-Nov-18 16:00 3.21 Days
Continuous		 310p 240kV A bus,T32 & 310p412 Advice,310p Sundance 240kV Bus A,310P T32 (310P Sundance) Migrate and commission all T32 & 310P412 protections, breaker, status, controls, alarms, metering and remote access to the new RTU ,Migrate and commission all T32 & 310P412 protections, breaker, status, controls, alarms, metering and remote access to the new RTU and LAN. Replace 310P3289 air break control module, commission alarms control and status to new RTU.  
ALTALINK 28-Nov-18 07:00 07-Dec-18 17:00 9.42 Days
Continuous		 926L (310p - 17s) - GOI Component replacements on Structures #????  
ATCO 29-Nov-18 07:00 30-Nov-18 17:30 1.44 Days
Continuous		 2075S ACF21 Switching for SVC2 Outage  
EPCOR 29-Nov-18 07:00 05-Dec-18 17:00 6.42 Days
Continuous		 Tx2 Outage @ E52S East Industrial S/S Cutover of new relay protection.  
EPCOR 03-Dec-18 07:30 07-Dec-18 17:00 4.4 Days
Continuous		 TX4 @ Jasper S/S Metering Cutover  
ATCO 03-Dec-18 08:00 07-Dec-18 15:00 4.29 Days
Continuous		 9L46 GOI to complete the OPGW repair. on 9L46.
Ground switches required to be closed at Pemukan and Lanfine.		  
BCH 03-Dec-18 09:00 13-Dec-18 17:00 10.33 Days
Continuous		 1L274 (Britt Creek - 1D4L274) Annual Plan Request F19 AB-BC
ALTALINK 03-Dec-18 10:00 06-Dec-18 16:00 3.25 Days
Continuous		 902L (310p - 19s) Advice Migrate and commission all L3 - 902L at 310P Sundance associated line protections, breakers, breaker fail and Tele-protection alarms, status, controls, metering and remote access to new RTU and LAN. Migrate and commission CVT-L3 alarms.  
ATCO 03-Dec-18 12:00 06-Dec-18 12:00 3 Days
Continuous		 7L199 7L199 relocate poles 30 36 [ crew charge ]
7L199 Line Move		  
ALTALINK, ATCO 05-Dec-18 08:00 06-Dec-18 17:30 1.4 Days
Continuous		 526L/126L (126L1) - Advice,6L126 (515L tap - 743s Sarah Lake) Closing Open Point 'C'  
EPCOR 06-Dec-18 07:00 07-Dec-18 17:00 1.42 Days
Continuous		 Tx1 Outage @ E52S East Industrial S/S Cutover of new relay protection.  
ATCO 07-Dec-18 07:00 07-Dec-18 17:00 10 Hours
Continuous		 800s 702 (800s Friedenstal) Breaker fail testing  
ALTALINK 10-Dec-18 07:00 10-Dec-18 09:00 2 Hours
Daily		 17s 11 (17s Benalto) Trip Test for 190L Protection Replacement  
ATCO 10-Dec-18 07:00 10-Dec-18 17:00 10 Hours
Continuous		 800s 712 (800s Friedenstal),800s 702T (800s Friedenstal) Breaker fail testing  
ALTALINK 10-Dec-18 07:00 11-Dec-18 17:00 1.42 Days
Continuous		 922L (310p - 17s) - GOI Component replacements on the A-frame slack span for 922L  
ALTALINK 10-Dec-18 07:00 12-Dec-18 15:00 2.33 Days
Continuous		 17s 240kV North Bus 1 and 17s T3 - GOI Component replacements on the A-frame slack span for 922L & 926L  
EPCOR 10-Dec-18 07:30 14-Dec-18 17:00 4.4 Days
Continuous		 TX1 @ Jasper S/S Metering Cutover  
ALTALINK 10-Dec-18 08:00 13-Dec-18 16:00 3.33 Days
Continuous		 1325L (510s - 511s) - De-energized Sunnybrook interconnection project requires modification to the 510s-511s C&P systems. Modifications are required in programming, software and hard wiring. After modifications are implemented, testing of new logic and new equipment status of 510s2952, 510s4789 and trip /open command A21/12L41 to initiate ESOF1-P1, trip/open command B21/12L41 to initiate ESOF1-P2 trips are required.  
ALTALINK 10-Dec-18 08:00 17-Dec-18 08:00 7 Days
Continuous		 510s2852 and 1238L - GOI Installing new 510s2952, CT's, 510s46, 510s48 and protection; Closing Open Points 'A', 'B', 'D' & 'E'  
ATCO 10-Dec-18 08:00 17-Dec-18 16:00 7.33 Days
Continuous		 930S Synchronous Condenser Sync Condenser turnaround, unavailable for dispatch  
ALTALINK 10-Dec-18 09:00 10-Dec-18 11:00 2 Hours
Daily		 17s 6 (17s Benalto) Trip Test for 190L Protection Replacement  
ALTALINK 10-Dec-18 11:30 10-Dec-18 13:30 2 Hours
Daily		 17s 7 (17s Benalto) Trip Test for 190L Protection Replacement  
ATCO 10-Dec-18 12:00 13-Dec-18 12:00 3 Days
Continuous		 7L199 7L199 relocate poles 30 36 [ crew charge ]
7L199 Line Move		  
ALTALINK 10-Dec-18 13:30 10-Dec-18 15:00 90 Mins
Daily		 17s 1 (17s Benalto) Trip Test for 190L Protection Replacement  
ALTALINK 11-Dec-18 07:00 11-Dec-18 09:00 2 Hours
Daily		 17s 10 (17s Benalto) Trip Test for 190L Protection Replacement  
ALTALINK 11-Dec-18 09:00 11-Dec-18 11:00 2 Hours
Daily		 17s2852 & T3 - GOI,17s 2852 (17s Benalto),17s T3 (17s Benalto),17s 389 (17s Benalto) Trip Test for 190L Protection Replacement  
ALTALINK 11-Dec-18 11:00 11-Dec-18 13:30 2.5 Hours
Daily		 17s 3 (17s Benalto) Trip Test for 190L Protection Replacement  
ALTALINK 12-Dec-18 07:00 20-Dec-18 17:00 8.42 Days
Continuous		 926L (310p - 17s) - GOI Component replacements on Structures #????  
ALTALINK 12-Dec-18 09:00 12-Dec-18 17:00 8 Hours
Daily		 17sT2 & 240kV Bus2 - GOI South PLT Crew changing out insulators on the 240kV South Bus 2.  
ALTALINK 17-Dec-18 08:00 21-Dec-18 08:00 4 Days
Continuous		 510s2852 - GOI Installing new 510s2952, CT's, 510s46, 510s48 and protection; Closing Open Points 'A', 'B', 'D' & 'E'  
ALTALINK 20-Dec-18 09:00 20-Dec-18 13:00 4 Hours
Daily		 310p 240 C Bus,T36,T33 Advice trip testing from 310p767X breaker fail to 310p2852, 310p69 and 310p414.  
ALTALINK 01-Jan-19 07:00 28-Feb-19 18:00 58.46 Days
Continuous		 1046L (310p Sundance - 338s Cherhill),902L (19s Wabamun - 310p Sundance),1046L (310p-338s-19s) and 902L (310p-19s Replacing structures  
BCH 15-Jan-19 09:00 18-Jan-19 17:00 3.33 Days
Continuous		 2L294 (Nelway - A.A. Lambert) Placeholder for Annual Plan Request F19 - BC maintenance does not affect AB ATC AB-BC
ENMAX, ALTALINK 04-Feb-19 08:00 15-Feb-19 16:00 11.33 Days
Continuous		 24.83L (74s Janet - ENMAX 24) Transmission Line Relocate  
SUNCOR 18-Mar-19 08:00 23-Mar-19 18:00 5.42 Days
Continuous		 29PL9-12 (29EDD-34 - 29EDD-65) broken strand repair  
ATCO 19-Mar-19 07:00 26-Mar-19 17:00 7.42 Days
Continuous		 7L75 Upgrade 7L75 protection and install new TPR and RAS

study not sent for		  
SUNCOR 02-Apr-19 08:00 08-Jun-19 18:00 67.42 Days
Continuous		 29EDD-1 Millennium,29EDD-1 952_102 (29EDD-1 Millennium),29EDD-1 952_101 (29EDD-1 Millennium),29EDD-1 952_104 (29EDD-1 Millennium) 5 years maintenance  
ALTALINK, Lethbridge 02-Apr-19 13:00 09-Apr-19 15:00 7.08 Days
Continuous		 725L (674s Lethbridge Bowron - 15s Fort MacLeod) replace 138KV Breaker  
ATCO 09-Apr-19 07:00 15-Apr-19 17:00 6.42 Days
Continuous		 7L73,800S 702 Upgrade 7L73 protection and install TPR and new RAS.

study not sent for		  
ATCO 16-Apr-19 07:00 23-Apr-19 17:00 7.42 Days
Continuous		 7L73,730S 703 Upgrade 7L73 protection and install teleprotection and new RAS @ 730s, 829s radial fed from 800s.

study not sent for		  
ALTALINK, Lethbridge 23-Apr-19 13:00 09-May-19 14:00 16.04 Days
Continuous		 725L (111s Coalbanks - 674s Lethbridge Bowron) replace 138KV Breaker  
BCH 08-May-19 09:00 13-Jun-19 17:00 36.33 Days
Continuous		 5L72 (Mica Creek - Nicola) Placeholder for MCA Switchgear Roof Replacement. AB-BC
ATCO 23-May-19 07:00 28-May-19 16:00 5.38 Days
Continuous		 7L86 Build t tap for new Athik sub connection  
ATCO 01-Jun-19 07:00 02-Jun-19 17:00 1.42 Days
Continuous		 959s 901T,959s 900BS1 Attach new bay  
ATCO 03-Jun-19 09:00 29-Jul-19 17:00 56.33 Days
Continuous		 840S McNeill Station 2019 McNeill Fall T/A. Arrestor install and Bird Proofing AB-SK
ATCO 06-Jun-19 07:00 07-Jun-19 17:00 1.42 Days
Continuous		 766S 901T,766S 701 RAS modifications  
SUNCOR 24-Jun-19 08:00 28-Jun-19 18:00 4.42 Days
Continuous		 29EDD-1 Millennium 5 year maintenance  
SUNCOR 01-Jul-19 08:00 19-Jul-19 18:00 18.42 Days
Continuous		 29EDD-3 29Edd-3 maintenance  
SUNCOR 01-Jul-19 08:00 19-Jul-19 18:00 18.42 Days
Continuous		 30EDD-2 5 year maintenance  
SUNCOR 01-Jul-19 09:00 14-Jul-19 18:00 13.38 Days
Continuous		 30EDD-2 maintenance & testing on breaker  
ATCO 17-Jul-19 08:00 23-Jul-19 17:00 6.38 Days
Continuous		 834S 902T Three Creeks Project Install the foundations and A-Frame for the new 240 kV bays  
SUNCOR 22-Jul-19 08:00 26-Jul-19 18:00 4.42 Days
Continuous		 29EDD-1 Millennium 5 year maintenance  
ENMAX 29-Jul-19 08:00 09-Aug-19 16:00 11.33 Days
Continuous		 932L Line Protection Upgrade  
SUNCOR 12-Aug-19 08:00 30-Aug-19 18:00 18.42 Days
Continuous		 30EDD-1 5 year 624T transformer maintenance and repair  
SUNCOR 26-Aug-19 09:00 05-Sep-19 18:00 10.38 Days
Continuous		 29PL9-14 (29EDD-56 - 29EDD-34),29PL9-15 (29EDD-56 - 29EDD-34) maintenance on bus 29PP-41F  
ATCO 28-Aug-19 07:00 02-Sep-19 17:00 5.42 Days
Continuous		 766S 701,766S 901T RAS modifications  
SUNCOR 30-Sep-19 08:00 01-Nov-19 18:00 32.42 Days
Continuous		 29PL9-5 (29EDD-1 Millennium - 29EDD-34),29PL9-6 (29EDD-1 Millennium - 29EDD-34) 5 year maintenance  
ENMAX 28-Oct-19 08:00 08-Nov-19 16:00 11.38 Days
Continuous		 918L Line Protection Upgrade  
ATCO 07-Nov-19 07:00 07-Nov-19 17:00 10 Hours
Continuous		 9L93,Halkirk Wind Farm Attach new in out station  
ATCO 07-Dec-19 07:00 12-Dec-19 17:00 5.42 Days
Continuous		 9L93,Halkirk Wind Farm Reroute OPGW test and commission.  
ATCO 07-Jan-20 08:00 27-Jan-20 17:00 20.38 Days
Continuous		 834S 902T Three Creeks Project
Install the 240 kV switches (close proximity to energized bus),
String the flex bus between the bus A-Frames and line A-Frames
Re configure the pipe bus to its final configuration
Commission 902T logic to new breakers		  
ATCO 13-Jan-20 08:00 17-Jan-20 17:00 4.38 Days
Continuous		 7L131 To facilitate the installation of the new 9L124 and 9L139 we need to lower 7L08, 7L131 and 7L106  
ATCO 20-Jan-20 08:00 24-Jan-20 17:00 4.38 Days
Continuous		 7L106 To facilitate the installation of the new 9L124 and 9L139 we need to lower 7L08, 7L131 and 7L106  
ATCO 03-Aug-20 07:00 03-Nov-20 17:00 92.46 Days
Continuous		 972S 905B Project  
SUNCOR 14-Sep-20 09:00 20-Sep-20 18:00 6.38 Days
Continuous		 29PL9-2 (29EDD-1 Millennium - 848s Ruth Lake) maintenance on 29CTT-1 in 29EDD-1  

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: 2018-10-17   3:26:57 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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