Alberta Electric System Operator
Long Range Significant Transmission Outages for the period of 24 months starting 2017-12-16

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 02-Oct-17 10:00 22-Dec-17 16:00 81.29 Days
Continuous
320p T1 (320p Keephills) urgent repair - forced outage  
ALTALINK, ENMAX 01-Nov-17 07:00 22-Dec-17 17:00 51.46 Days
Continuous
693L (42s Sarcee - ENMAX 10),916L (42s Sarcee - 5s East Calgary) [SWCRR] 916L and 693L to move U/G for a portion, connect new U/G cables at both ends  
ATCO 06-Nov-17 15:01 02-Jan-18 16:00 57.04 Days
Continuous
9L948 (650s Hansman Lake - 863s Paintearth),863S Paintearth 240 kV switch replacement - changed to forced outage  
ALTALINK 13-Dec-17 06:30 17-Dec-17 19:30 4.54 Days
Continuous
879L (368s Burdett - 244s Bowmanton) eye nut changeout  
ALTALINK 13-Dec-17 06:30 17-Dec-17 19:30 4.54 Days
Continuous
676L (523s Bullshead - 244s Bowmanton) eye nut changeout  
ATCO 18-Dec-17 08:00 20-Dec-17 17:00 2.38 Days
Continuous
7L77 Arm changes  
ALTALINK 18-Dec-17 09:00 18-Dec-17 10:00 60 Mins
Daily
42s90 (42s7 Breaker) Advice Function trips test on 42s7  
ALTALINK 18-Dec-17 10:01 18-Dec-17 11:00 59 Mins
Daily
42s19 (42s21 Breaker) Advice Function trips test on 42s21  
ALTALINK 18-Dec-17 12:01 18-Dec-17 13:00 59 Mins
Daily
42s39 (42s40 Breaker) Advice Function trips test on 42s40  
ALTALINK 20-Dec-17 09:15 21-Dec-17 14:45 29.5 Hours
Continuous
913L (69s - 338s) GOI Replace Cross arm on Structure  
ALTALINK 20-Dec-17 23:00 21-Dec-17 03:00 4 Hours
Continuous
62s11 (62s Brazeau) maintenance  
ALTALINK 21-Dec-17 03:00 21-Dec-17 07:00 4 Hours
Daily
62s12 (62s Brazeau) maintenance  
ATCO 21-Dec-17 09:30 21-Dec-17 17:00 7.5 Hours
Continuous
813S 902T,813S 902TD 813S 902TD clean and check operation
 
ATCO 02-Jan-18 07:00 25-Jan-18 17:00 23.42 Days
Continuous
9L70,801S 900 BUS 2 240kV bus # 2 OOS for Construction - Protection upgrade, Breaker and a third bus configuration at 801s will be open at one end  
ATCO 03-Jan-18 07:00 04-Jan-18 17:30 1.44 Days
Continuous
9L01 Install piles for new structures for Thickwood tap.  
ENMAX 04-Jan-18 12:00 04-Jan-18 16:00 4 Hours
Continuous
832L. 12.1TR. 12B138-832L Install CAC/OAC relays and rewire dev. 43 for RTU upgrade. Devices will need to be operated Locally due to RTU change out. Close open close operation required for commissioning.  
ALTALINK 05-Jan-18 07:15 24-Jan-18 18:45 19.48 Days
Continuous
935L (324s - 356s) GOI Line Maintenance  
CENOVUS 06-Jan-18 07:00 06-Jan-18 18:00 11 Hours
Continuous
539S 9301T (539s Sunday Creek) replace faulty temperature gauge  
ATCO 08-Jan-18 07:00 27-Jan-18 17:00 19.42 Days
Continuous
9L70 Protection upgrade  
ATCO 08-Jan-18 08:00 11-Jan-18 17:00 3.38 Days
Continuous
7L89 Pole change on 7L89/7L91 double cct line, 721s radial fed from 700s  
ALTALINK 08-Jan-18 11:00 11-Jan-18 17:00 3.25 Days
Continuous
1203L (320p - 510s) GOI Migrate controls, annunciation and analogs to new RTU. Redundant protections will be taken out of service one at a time.  
ALTALINK 09-Jan-18 07:30 15-Mar-18 15:30 65.29 Days
Continuous
526L (268s - 526L185) - GOI Replacing structures and conductors from Structures 1 - 151  
ALTALINK 09-Jan-18 08:00 09-Jan-18 18:00 10 Hours
Daily
42s 138kV North Bus GOI [SWCRR] [SWCRR] Create open point between 42s 138kV North bus and 42s43, and salvage 42s43. (prepping for savlage of old 693L equipment).  
ALTALINK 09-Jan-18 08:00 10-Jan-18 17:00 1.38 Days
Continuous
63s T2(TX18898) - GOI Fix oil leaks on T1 Tx18898  
ALTALINK 10-Jan-18 08:00 10-Jan-18 12:00 4 Hours
Daily
102s 5652 (102s Langdon) Change out burned up heaters, need outage as heaters are close to charged springs.  
ALTALINK 10-Jan-18 08:00 11-Jan-18 18:00 1.42 Days
Continuous
42s 138kV South Bus GOI [SWCRR] [SWCRR] Salvage 42s552 from underneath South Bus  
ALTALINK 10-Jan-18 13:00 10-Jan-18 16:00 3 Hours
Daily
102s7452 - GOI Change out burned up heaters, need outage as heaters are close to charged springs.  
ALTALINK 11-Jan-18 07:00 17-Jan-18 17:30 6.44 Days
Continuous
675L (244s-41s-321s) GOI Cutfree 675L from 41s & Cut in 675L at 321s Al Rothbauer  
ALTALINK 11-Jan-18 08:00 11-Jan-18 16:00 8 Hours
Daily
63s T1(TX18310) - GOI Fix oil leaks on T1 Tx18310  
ALTALINK 11-Jan-18 11:00 11-Jan-18 15:00 4 Hours
Daily
102s252 - GOI Change out burned up heaters, need outage as heaters are close to charged springs.  
ALTALINK 13-Jan-18 07:00 13-Jan-18 19:00 12 Hours
Daily
38s T4(Tx18700) - GOI Trip testing for 38s18 and transformer inspection  
ENMAX 15-Jan-18 08:00 26-Jan-18 16:00 11.33 Days
Continuous
28.80L. 28s & Sarcee 138KV Bus Differential Protection Line Protection Upgrade  
ALTALINK 15-Jan-18 08:00 26-Jan-18 17:00 11.38 Days
Continuous
788L (157s - 788L106B) - GOI Line maintenance  
ALTALINK 15-Jan-18 09:00 25-Jan-18 15:30 10.27 Days
Continuous
28s8 and 931L GOI Breaker Replacement  
EPCOR 15-Jan-18 09:00 02-Feb-18 15:00 18.25 Days
Continuous
J722,J724,72JM18,72JW19 Manhole resurfacing  
ALTALINK 15-Jan-18 09:15 18-Jan-18 17:45 3.35 Days
Continuous
925L (63s - 74s) GOI Component Replacement  
BCH 16-Jan-18 09:00 26-Jan-18 17:00 10.33 Days
Continuous
1L275 (799s Coleman - Natal) replace end-of-life and defective structures AB-BC
ALTALINK 17-Jan-18 07:30 17-Jan-18 16:00 8.5 Hours
Daily
520s 552 (520s Benett),1201L (520s Bennett - BCH Cranbrook) Test and inspect breaker AB-BC
MONTANA 17-Jan-18 07:30 17-Jan-18 16:00 8.5 Hours
Continuous
MATL (120s Picture Butte - Montana) align with 1201L outage AB-MATL
ALTALINK 17-Jan-18 10:00 17-Jan-18 16:00 6 Hours
Daily
953L (755s - 574s) De-energize 953L needs to be de-energized as part of the 9404R Bonlea - 9933R ATCO Strome radio replacement  
EPCOR 22-Jan-18 07:00 26-Jan-18 17:00 4.42 Days
Continuous
TX1 @ Castledowns Calisto Install  
ALTALINK 23-Jan-18 07:00 26-Jan-18 17:00 3.42 Days
Continuous
41s station,880L(523s-41s) Advice Install 880L bypass, cut free 41s  
ALTALINK 23-Jan-18 07:15 25-Jan-18 17:45 2.44 Days
Continuous
925L (63s - 74s) GOI Component Replacement  
ALTALINK 25-Jan-18 06:15 26-Jan-18 18:45 1.52 Days
Continuous
923L (356s - A2075s) GOI Complete Line Maintenance / Trouble Corrective Work  
ALTALINK 27-Jan-18 06:30 30-Jan-18 18:00 3.48 Days
Continuous
880L (523s-321s) GOI Protection setting changes and checks  
ALTALINK 27-Jan-18 07:00 30-Jan-18 17:00 3.42 Days
Continuous
880L (Open Point T-321s-523s) GOI Terminate 880L from 523s to south A frame @ 321s Al Rothbauer ( Close 321s open Point D, 880L open point B).880L settings changes/commissioning and end to end testing.  
ALTALINK 29-Jan-18 09:15 01-Feb-18 17:45 3.35 Days
Continuous
925L (63s - 74s) GOI Component Replacement  
ATCO 30-Jan-18 07:00 31-Jan-18 12:00 29 Hours
Continuous
801S 910B Protection upgrade, 9L100D1 logic testing  
ATCO 30-Jan-18 07:00 31-Jan-18 12:00 29 Hours
Continuous
801S 910A Protection upgrade, 9L100D1 logic testing  
ATCO 31-Jan-18 12:00 31-Jan-18 17:00 5 Hours
Continuous
801S 910 Protection upgrade, 9L100D1 logic testing  
ATCO 01-Feb-18 07:00 02-Feb-18 12:00 29 Hours
Continuous
801S 911B Protection upgrade, 9L100D1 logic testing  
ATCO 01-Feb-18 07:00 02-Feb-18 12:00 29 Hours
Continuous
801S 911A Protection upgrade, 9L100D1 logic testing  
ENMAX 01-Feb-18 08:00 01-Feb-18 16:00 8 Hours
Continuous
832L. 10.1TR HV SW MD maint MD-10.1TR.  
ATCO 01-Feb-18 12:00 02-Feb-18 17:00 29 Hours
Continuous
801S 911 Protection upgrade  
ATCO 02-Feb-18 07:00 09-Feb-18 17:30 7.44 Days
Continuous
9L07 Install 9L07 cut in structures for new 951S Thickwood Hills substation.  
ATCO 02-Feb-18 07:00 14-Feb-18 17:00 12.42 Days
Continuous
7L90 Attach Muir POD T-Tap switch 7LA90, 144kV ring bus will be open @ 813s.
Issue COG on new 7LA90 line switch at tap.
 
ALTALINK 03-Feb-18 06:15 15-Feb-18 18:45 12.52 Days
Continuous
945L (275s - 562s) GOI Interphase Spacer installation  
ALTALINK 03-Feb-18 06:30 07-Feb-18 18:00 4.48 Days
Continuous
880L/892L (41s-321s) GOI rename 892L to 880L, connect to 321s.  
ENMAX 03-Feb-18 08:00 03-Feb-18 16:00 8 Hours
Continuous
162.81L. 162PT138-162.81 HV SW MD maint MD-162.81, SW82, SW83  
ATCO 05-Feb-18 07:00 15-Feb-18 17:00 10.42 Days
Continuous
717S 144kV Bus,7L66 Install new 704A, 144 KV bus PT's, 704, 704T, 504TD, 7L66 OOS (7L66 is part of cold lake cutplane), 717s radial fed via 7L28  
ALTALINK 06-Feb-18 07:15 08-Feb-18 17:45 2.44 Days
Continuous
925L (63s - 74s) GOI Maintenance Components  
ALTALINK 06-Feb-18 07:15 08-Feb-18 17:45 2.44 Days
Continuous
918L (281s - C162s) GOI Component Replacement  
ATCO 07-Feb-18 07:00 07-Feb-18 17:00 10 Hours
Continuous
LonePine_T-Telecom telecom traffic, SCADA operation  
ATCO 08-Feb-18 07:00 08-Feb-18 17:00 10 Hours
Continuous
7L90,741S 701 Breaker fail testing, 7L90 will already be OOS under GOI 2-42130  
ATCO 09-Feb-18 07:00 11-Feb-18 17:30 2.44 Days
Continuous
9L07 (1) String new portion 9L01/9L30 over 9L07 for new 951S Thickwood Hills substation.  
ALTALINK 12-Feb-18 09:15 15-Feb-18 17:45 3.35 Days
Continuous
918L (281s - C162s) GOI Component Replacement  
ALTALINK 16-Feb-18 06:16 28-Feb-18 18:45 12.52 Days
Continuous
1002L (163s - 275s) GOI Interphase Spacer installation  
ATCO 16-Feb-18 07:00 16-Feb-18 17:00 10 Hours
Continuous
741S 702,7L199 Breaker fail testing, 7L199 will be open ended @ 741s.  
ALTALINK 20-Feb-18 07:30 20-Feb-18 12:30 5 Hours
Daily
74s 240kV Bus 1 & 932L/929L – GOI Create Open Point ‘A’ On Sheet one on 240kV Bus 1 between 74s48 and Sheet 2  
ATCO 20-Feb-18 08:00 22-Feb-18 17:00 2.38 Days
Continuous
7L64 Line Mitigation  
ALTALINK 20-Feb-18 12:30 08-Mar-18 12:30 16 Days
Continuous
74s T1 932L/929L – Advice 74s352, 74s552 CT Replacements, 74s92, 74s94 Pt Replacements  
ATCO 27-Feb-18 07:00 04-Mar-18 18:00 5.46 Days
Continuous
7L22 Build junction for new in and out POD 2030S Hughes  
ATCO 07-Mar-18 07:00 16-Mar-18 17:30 9.4 Days
Daily
9L01 9L01 Cut in for in and out addition of 951S Thickwood Hills substation. Install new structures.  
ALTALINK 08-Mar-18 12:30 08-Mar-18 17:30 5 Hours
Daily
74s 240kV Bus 1 & 932L/929L – GOI Close Open Point ‘A’ On Sheet one on 240kV Bus 1 between 74s48 and Sheet 2  
ALTALINK 12-Mar-18 09:15 15-Mar-18 17:45 3.35 Days
Continuous
918L (281s - C162s) GOI Component Replacement  
EPCOR 16-Mar-18 13:30 16-Mar-18 17:00 3.5 Hours
Continuous
J2404 @ Jasper Nait Switching  
ALTALINK 19-Mar-18 09:15 22-Mar-18 17:45 3.35 Days
Continuous
918L (281s - C162s) GOI Component Replacement  
ALTALINK 26-Mar-18 09:15 28-Mar-18 17:45 2.35 Days
Continuous
918L (281s - C162s) GOI Component Replacement  
ATCO 30-Mar-18 07:00 30-Mar-18 17:00 10 Hours
Continuous
Wintering Hills_S_Telecom,Wintering Hills_T-Telecomr reroute cables into new telecom building,reroute cables into new telecom building
 
ATCO 31-Mar-18 07:00 31-Mar-18 17:00 10 Hours
Continuous
Anderson_T-Telecom,801S Anderson reroute cables into new telecom building  
ENMAX 03-Apr-18 08:00 17-Apr-18 16:00 14.33 Days
Continuous
936L Green Line LRT Project  
ENMAX 03-Apr-18 08:00 17-Apr-18 16:00 14.33 Days
Continuous
937L Green Line LRT Project  
EPCOR 16-Apr-18 07:00 20-Apr-18 17:00 4.42 Days
Continuous
TX2 @ Castledowns Calisto Install  
ATCO 16-Apr-18 07:00 27-Apr-18 17:30 11.44 Days
Continuous
7L129,710S 704 Protection upgrades  
ATCO 01-May-18 08:00 03-May-18 15:00 2.29 Days
Continuous
791S 702,7L81 Install new 7L81 RASA & RASB  
BCH 07-May-18 09:00 11-May-18 17:00 4.33 Days
Continuous
2L112 (Nelway - Boundary) annual plan request F19 AB-BC
BCH 22-May-18 09:00 01-Jun-18 17:00 10.33 Days
Continuous
5L72 (Mica Creek - Nicola) Annual Plan Request F19 - PLACEHOLDER for Conductor Spacer Replacement AB-BC
ATCO 30-May-18 07:00 01-Jun-18 17:30 2.44 Days
Continuous
9L46 Attach new Sharp Hills wind farm in/out connection.  
BCH 04-Jun-18 09:00 15-Jun-18 17:00 11.33 Days
Continuous
5L71 (Mica Creek - Nicola) Annual Plan Request F19 - PLACEHOLDER for Conductor Spacer Replacement AB-BC
BCH 05-Jun-18 09:00 15-Jun-18 17:00 10.33 Days
Continuous
2L294 (Nelway - A.A. Lambert) replacement of defective insulators AB-BC
BCH 06-Jun-18 09:00 07-Jun-18 17:00 1.33 Days
Continuous
1L274 (Elkford - EFT1D21) Annual Plan Request AB-BC
ATCO 10-Sep-18 09:00 14-Sep-18 17:00 4.33 Days
Continuous
801S 901T 801S Anderson 901T Re-test Sept 10, 2018  
BCH 10-Sep-18 09:00 14-Sep-18 17:00 4.33 Days
Continuous
1L274 (B1s BCH Natal - 1D1L274) 2018 annual plan work AB-BC
ALTALINK 10-Sep-18 09:15 13-Sep-18 17:45 3.35 Days
Continuous
1201L (520s Bennett - BCH Cranbrook) maintenance components AB-BC
ALTALINK 17-Sep-18 08:45 20-Sep-18 17:45 3.38 Days
Continuous
1201L (520s Bennett - BCH Cranbrook) maintenance components AB-BC
ALTALINK 24-Sep-18 08:45 27-Sep-18 17:45 3.38 Days
Continuous
1201L (520s Bennett - BCH Cranbrook) maintenance components AB-BC
ATCO 08-Jan-19 07:00 11-Jan-19 17:30 3.44 Days
Continuous
9L01 9L01 Cut in for in and out addition of 951S Thickwood Hills substation. Remove bypass at substation.  
ATCO 15-Jan-19 07:00 18-Jan-19 17:30 3.44 Days
Continuous
9L07 Cut in 951S Thickwood Hills substation.  

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: 2017-12-07   5:21:45 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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