Alberta Electric System Operator
System Co-ordination Plan
2023-05-25 to 2023-06-02
Approved Outages

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From To Owner Type Element Scheduled Activity Date/Time Comments Interconnection
05-Oct-18 08:00 31-Dec-23 16:00 EPCOR IO C2 (Rossdale) forced outage 1,913.38 Days
Continuous		  
24-Oct-18 01:13 31-Dec-23 16:00 EPCOR IO C1 (Rossdale) forced outage 1,894.66 Days
Continuous		  
05-Jan-21 08:00 01-Jun-23 18:00 SUNCOR Outage Unmodeled Transmission Facility (Suncor) 29PT-69
877.38 Days
Continuous		  
14-Mar-22 14:00 02-Jun-23 18:00 ATCO TE 813s SVC (813s Little Smoky) emergency real time failed relay 445.17 Days
Continuous		  
18-Apr-22 08:00 05-Jun-23 17:00 ATCO TE 813s Little Smoky 144kV Bus 1, 813s Little Smoky 144kV Bus 2, 813s Little Smoky 240kV Bus 1, 813s Little Smoky 240kV Bus 2 813S Little Smoky rebuild: cutover wiring to the new relays as their corresponding apparatus are out of service 413.38 Days
Continuous		  
18-Apr-22 08:00 05-Jun-23 17:00 ATCO TE 813s Little Smoky 813S Little Smoky rebuild: cutover wiring to the new relays as their corresponding apparatus are out of service 413.38 Days
Continuous		  
19-Apr-22 08:00 29-May-23 17:00 ATCO TE 813s Little Smoky protection relay work 405.38 Days
Continuous		  
04-Sep-22 16:50 30-Sep-24 18:00 ATCO Outage 848s 401R (848s Ruth Lake) forced outage 757.05 Days
Continuous		  
22-Sep-22 07:00 02-Jun-23 17:00 EPCOR Outage T2 (Garneau) Garneau: TX2 LCR WETUP Project 253.42 Days
Continuous		  
21-Dec-22 07:58 06-Jun-23 18:00 ALTALINK Outage 38s C1 (38s East Edmonton) tripped 167.38 Days
Continuous		  
03-Jan-23 12:00 30-Jun-23 16:00 ENMAX Outage 14.2C (SS-14) forced outage 178.13 Days
Continuous		  
13-Feb-23 07:00 02-Jun-23 17:00 EPCOR Outage T2 (Garneau), G725 (Garneau), G726 (Garneau), GAB2 (Garneau), GT2-O (GARNEAU) transformer replacement 109.38 Days
Continuous		  
21-Feb-23 10:00 31-May-23 17:00 ATCO, CNRL TE 847s RTU/SCADA (847s Muskeg River) download RTU program changes for 9L66 line relocation in 847S Muskeg Rive 99.25 Days
Continuous		  
06-Mar-23 07:00 30-Jun-23 17:00 EPCOR TE Meadowlark relay maintenance 116.38 Days
Continuous		  
09-Mar-23 08:00 31-May-23 17:00 ATCO TE 2005s RTU/SCADA (2005s Secord) upgrade RTU and HMI programs 83.33 Days
Continuous		  
13-Mar-23 10:00 31-May-23 17:00 ATCO TE 838S Substation RTU RTU downloads 79.29 Days
Continuous		  
15-Mar-23 10:00 16-Jun-23 17:00 CNRL TE 847s Muskeg River 9L66 relays end to end commissioning with new remote end at 838S Horizon 93.29 Days
Continuous		  
15-Mar-23 18:01 30-Aug-23 18:00 SUNCOR Outage 29EDD-71 752-4651 (29EDD-71) breaker will remain offline for undetermined period of time 168 Days
Continuous		  
20-Mar-23 10:00 31-May-23 17:00 ATCO TE 957s RTU/SCADA (957s McClelland) RTU downloads 72.29 Days
Continuous		  
03-Apr-23 10:00 23-Jun-23 17:00 ATCO TE 849s RTU/SCADA (849s Joslyn Creek) RTU configuration updates 81.29 Days
Continuous		  
03-Apr-23 11:00 16-Jun-23 17:00 ATCOP, CNRL TE 838s Horizon Mining implement 3 terminal protection scheme on SEL relay for temporary scheme of Horizon Expansion, Muskeg and Secord connected together 74.25 Days
Continuous		  
13-Apr-23 10:00 01-Jun-23 18:00 ATCO IO 840S 505 FA3 Forced outage Transfer limit 90MW
investigate/repair breaker 505 due to lockout, waiting for parts		 49.33 Days
Continuous		  
15-Apr-23 08:30 16-Jun-23 17:30 ATCOP, CNRL TE 838s Horizon Mining 240 kV breaker protection testing 62.38 Days
Continuous		  
17-Apr-23 10:00 05-Jun-23 16:00 ATCO Outage 740s 701 (740s H.R. Milner), 740s 701B (740s H.R. Milner) replace damaged switch arm on 701B 49.25 Days
Continuous		  
24-Apr-23 08:00 12-Jun-23 20:00 Syncrude Outage T4 (Aurora) maintenance 49.5 Days
Continuous		  
24-Apr-23 08:00 31-May-23 17:00 ATCO IO 838S 905, 838S 906 construction of 838S Horizon expansion 37.38 Days
Continuous		  
25-Apr-23 08:00 02-Jun-23 17:00 ALTALINK TE 895s RTU/SCADA (895s Suffield) download new RTU configurations due to implementation of new protections and to correct any deficiencies 38.38 Days
Daily		  
26-Apr-23 08:00 06-Jun-23 17:00 ATCO Outage 769s 704C (769s Stettler) forced outage troubleshooting and repair of breaker 704 41.38 Days
Continuous		  
26-Apr-23 12:00 30-Jun-23 17:00 ATCO Outage 811s 701C (811s Clairmont Lake) Forced outage, repair 701CCS, low SF6. 701C OOS until repairs completed on 701CCS 65.21 Days
Continuous		  
28-Apr-23 08:00 28-May-23 18:00 SUNCOR Outage Unmodeled Transmission Facility (Suncor) 30EDD-1 - 30PL2-48 system maintenance 30.42 Days
Continuous		  
01-May-23 07:00 02-Jun-23 17:00 EPCOR TE Meadowlark 72 kV P&C relay maintenance 32.42 Days
Continuous		  
01-May-23 07:00 02-Jun-23 17:00 EPCOR TE EP Hardisty 72 kV P&C relay maintenance 32.42 Days
Continuous		  
01-May-23 07:30 16-Jun-23 15:00 CMH Outage MH-50L (MHS-2 North Industrial - MHS-5 NE Crescent Heights), MHS-2 MH69-212 (MHS-2 North Industrial), MHS-5 MH69-510 (MHS-5 NE Crescent Heights) update and test revised settings for existing MH69-50L line protection relays at MHS-2 and MHS-5 and repair MH69-511 disconnect switch at MHS-5 46.31 Days
Continuous		  
01-May-23 09:00 02-Jun-23 17:30 ATCO Outage 13L50 (2029s Heathfield - 2075s Newell), 2029s 1205 (2029s Heathfield), 2029s 1206 (2029s Heathfield), 2075s 916 (2075s Newell), 2075s 917 (2075s Newell) HMI upgrades and DC maintenance 32.35 Days
Continuous		  
01-May-23 09:00 02-Jun-23 17:30 ALTALINK IO 13L50 (A2075s-A2029s) Atco - Info HMI IT Upgrades AT 2075s & 2029s 32.35 Days
Continuous		  
01-May-23 10:01 29-May-23 12:00 ALTALINK IO 7L90 (A813s) OOS - Atco Info 813s Little Smoky rebuild 28.08 Days
Continuous		  
01-May-23 10:01 05-Jun-23 12:00 ATCO Outage 7L90 (813s Little Smoky - 7LA90 tap), 813s 702 (813s Little Smoky), 813s 703 (813s Little Smoky) 813S Little Smoky rebuild 35.08 Days
Continuous		  
03-May-23 05:25 02-Jun-23 18:00 ATCO Outage 7L81 (791s Rainbow Lake - BCH Harvest Energy FNC Tap) forced outage due to fire 30.52 Days
Continuous		  
03-May-23 07:00 31-May-23 22:00 CNRL TE 859s RTU/SCADA (859s Primrose) RTU upgrades 28.63 Days
Continuous		  
04-May-23 17:00 02-Jun-23 18:00 ALTALINK Outage 841L (477s Amoco West Pembina - 489s Petro-Canada Brazeau River) forced outage due to fire 29.04 Days
Continuous		  
04-May-23 17:00 02-Jun-23 18:00 ALTALINK Outage 828L (178s Cynthia - 489s Petro-Canada Brazeau River), 178s 828X (178s Cynthia), 489s 828E (489s Petro-Canada Brazeau River) forced outage due to fire 29.04 Days
Continuous		  
04-May-23 17:00 02-Jun-23 18:00 ATCO Outage 930s Syn Condenser (930s Arcenciel), 930s 702T (930s Arcenciel), 930s 719 (930s Arcenciel), 930s 406 (930s Arcenciel), 930s 407 (930s Arcenciel) forced outage due to fire 29.04 Days
Continuous		  
04-May-23 17:00 02-Jun-23 18:00 ALTALINK Outage 844L (358s Amoco Brazeau - 477s Amoco West Pembina), 477s 844X (477s Amoco West Pembina), 801L (294s Brazeau Outlet Works - 801AL tap), 801L (358s Amoco Brazeau - 801AL tap), 801AL (445s Elk River - 801L tap), 445s 801X (445s Elk River) forced outage due to fire 29.04 Days
Continuous		  
06-May-23 14:00 02-Jun-23 10:00 ALTALINK, CascadeP Outage 1084L (39s Bickerdike - 1047s Whisky Jack), 1047s GD006 (1047s Whisky Jack) forced outage due to fire 26.83 Days
Daily		  
07-May-23 10:00 25-May-23 10:00 ATCO Outage 9L99 (801s Anderson - 807s Sheerness), 807s 901T (807s Sheerness), 807S 901A (807s Sheerness), 807S 901B (807s Sheerness), 807S 904TD (807s Sheerness) maintenance work 18 Days
Continuous		  
08-May-23 08:00 02-Jun-23 17:00 ATCO Outage 7L71 (718s Parsons Creek - 2082s Dog Rib), 718s 702 (718s Parsons Creek) replace switches and switch structures 25.38 Days
Continuous		  
08-May-23 09:00 02-Jun-23 17:30 ATCO TE 2029s RTU/SCADA (2029s Heathfield) replace DC HMIs 25.35 Days
Continuous		  
08-May-23 09:00 02-Jun-23 17:30 ATCO TE 2075s RTU/SCADA (2075s Newell) replace DC HMIs 25.35 Days
Continuous		  
08-May-23 18:01 31-May-23 17:00 ATCO Outage 9L32 (838s Horizon Mining - 941s Bitumount), 9L66 (838s Horizon Mining - 847s Muskeg River) stage 3 for 9L66/9L32 reconnection 22.96 Days
Continuous		  
13-May-23 08:00 02-Jun-23 18:00 ATCO Outage 7L93 (828s Sulphur Point - 930s Arcenciel) forced outage due to fire 20.42 Days
Continuous		  
14-May-23 10:00 02-Jun-23 18:00 ALTALINK Outage 799L (235s Entwistle - 443s South Mayerthorpe) forced outage due to fire 19.33 Days
Continuous		  
15-May-23 07:00 26-May-23 18:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) 240 kV RTU - complete SCADA failover and complete the rewiring of physical security sensors in parallel with connections to the existing Fusion RTU 11.46 Days
Daily		  
15-May-23 07:00 26-May-23 18:00 ALTALINK TE 320p RTU/SCADA (320P Keephills) 500 kV RTU - complete SCADA failover and complete the rewiring of physical security sensors in parallel with connections to the existing Fusion RTU 11.46 Days
Daily		  
15-May-23 08:00 30-May-23 18:00 SUNCOR Outage 29EDD-94 29-952-9704 (29EDD-94 Voyageur), 29EDD-94 29-952-9705 (29EDD-94 Voyageur), 29EDD-94 29PS-400 (29EDD-94 Voyageur) breaker mtce & test 15.42 Days
Continuous		  
15-May-23 09:30 28-May-23 17:00 ATCO Outage 9L08 (849s Joslyn Creek - 888s Dover), 849s 905 (849s Joslyn Creek), 849s 906 (849s Joslyn Creek) 849s 9L08 protection upgrades 13.31 Days
Continuous		  
16-May-23 07:30 26-May-23 18:00 ATCOP, CNRL Outage 838s 75-TR-2801 (838s Horizon Mining), 838s 75-TR-1701 (838s Horizon Mining) 260kV 5YR PM 10.44 Days
Continuous		  
16-May-23 09:30 30-Jun-23 17:30 ATCO TE 951s RTU/SCADA (951s Thickwood Hills) 240 kV bus - protection end to ends and IMS panel commissioning 45.33 Days
Continuous		  
17-May-23 07:30 27-May-23 18:00 CNRL, ATCOP Outage 75-PLH-904 (838s Horizon Mining - 842s Horizon Upgrading), 838s 75-SD-904B (838s Horizon Mining), 842s 75-TR-5701 (842s Horizon Upgrading), 842s 75-TR-8701 (842s Horizon Upgrading), 842s 75-904A (842s Horizon Upgrading), 842s 75-1902 (842s Horizon Upgrading), 842s 75-1902B (842s Horizon Upgrading), 842s 75-1901 (842s Horizon Upgrading), 842s 75-1901A (842s Horizon Upgrading), 842s 75-1901B (842s Horizon Upgrading), 842s 75-1906 (842s Horizon Upgrading), 842s 75-1906A (842s Horizon Upgrading), 842s 75-1906B (842s Horizon Upgrading), 842s 75-8701 (842s Horizon Upgrading), 842s 75-5701 (842s Horizon Upgrading) 260kV 5 year PMs and protective relay upgrades 10.44 Days
Continuous		  
17-May-23 17:01 16-Jun-23 17:00 EPCOR Outage 72RG7 (Garneau - Rossdale) faulted cable 30 Days
Continuous		  
18-May-23 13:00 08-Jun-23 17:00 ATCO Outage 7L113 (853s Ring Creek - 930s Arcenciel) repair damaged structures due to wildfire 21.17 Days
Continuous		  
22-May-23 07:00 02-Jun-23 18:00 ALTALINK TE 356s RTU/SCADA (356s Milo) complete SCADA failover and complete the rewiring 11.46 Days
Daily		  
23-May-23 07:00 26-May-23 17:00 ALTALINK IO 908L (89s-E816s) Epcor - Advice Petrolia - 908LE zone CVT/CT/arrestor doble 3.42 Days
Continuous		  
23-May-23 07:00 02-Jun-23 17:00 EPCOR Outage 814s T2 (814s Bellamy), 814s B2406 (814s Bellamy), 814s B2402 (814s Bellamy), BR722 (Rossdale), 814s BAB2 (814s Bellamy) apparatus first week- TX2 doble and arrestor/PT doble, P&C second week- TX2 zone P&C maintenance 10.42 Days
Continuous		  
23-May-23 07:00 26-May-23 17:00 ALTALINK, EPCOR Outage 908L (89s Ellerslie - 816s Petrolia) Petrolia - 908LE zone CVT/CT/arrestor doble 3.42 Days
Continuous		  
23-May-23 07:00 02-Jun-23 17:00 EPCOR Outage T2 (Rossdale), R721 (Rossdale), R723 (Rossdale), RAB2 (Rossdale) Rossdale: RS5 demo 10.42 Days
Continuous		  
23-May-23 08:01 08-Jun-23 13:00 ALTALINK IO 1080L (SS-25 - SS-65) Altalink outage - expansion of GOI zone for urgent work to replace 1080L cables into C25s for scaffolding for cable terminations (Phasing required on return to service) 16.21 Days
Continuous		  
23-May-23 08:01 08-Jun-23 13:00 ENMAX, ALTALINK Outage 240kV West Bus (SS-25), 1080L (SS-25 - SS-65), 25B240-D138 (SS-25), 25B240-D139 (SS-25), 25B240-D142 (SS-25), 25B240-D133 (SS-25), 25B240-D136 (SS-25), 25MD240-1080 (SS-25), 65MD240-1080 (SS-65) Expansion of GOI Zone for Urgent work to replace 1080L cables into C25s for scaffolding for cable terminations 16.21 Days
Continuous		  
23-May-23 08:11 30-May-23 16:00 ENMAX Outage 38.1C (SS-38), 38B138-38.1CAP (SS-38) 38B138-38.1CAP tripped when requested to close. 38.1CAP will require maintenance 7.33 Days
Continuous		  
23-May-23 09:00 12-Jun-23 16:00 ATCO TE 849s Joslyn Creek 75-PLH-902, 900BS1 240 kV bus - block relays to test adjacent protection 20.29 Days
Continuous		  
23-May-23 11:00 26-May-23 14:30 ATCO Outage 936s 701T (936s Norberg), 936s 701 (936s Norberg) 701T Maintenance 3.15 Days
Continuous		  
23-May-23 12:00 02-Jun-23 17:00 ALTALINK Outage 535s 110 (535s Joffre), 535s T6 (535s Joffre) replacing underground cables, new PT and T6 protection upgrade to include under-voltage trip to 2271L 10.21 Days
Continuous		  
23-May-23 13:00 02-Jun-23 16:00 ALTALINK TE 535s Joffre replace and test T6 and 2271L relays 10.13 Days
Continuous		  
23-May-23 23:00 25-May-23 07:00 ALTALINK, TRANSALTA Outage 250p T1 (250p Bighorn Plant) Spring leakdown test 1.33 Days
Continuous		  
24-May-23 00:08 26-May-23 00:16 ATCO TE 2029s Heathfield, 2075s Newell EATL AC building network switch reboots to update the firmware 2.01 Days
Continuous		  
24-May-23 07:00 25-May-23 07:00 ALTALINK, TRANSALTA Outage 250p T2 (250p Bighorn Plant) Spring leakdown test 24 Hours
Continuous		  
24-May-23 10:30 25-May-23 17:30 ALTALINK Outage 853L (504s Queenstown - 853AL tap), 504s 853E (504s Queenstown) 1st trip PRC5 breaker maintenance 31 Hours
Continuous		  
25-May-23 07:00 25-May-23 17:00 EPCOR RB 987s T2 (987s Clover Bar), 987s T4 (987s Clover Bar) 72/240kV Tie-Line: Aerial- Washing Program (Spring) 10 Hours
Continuous		  
25-May-23 07:00 25-May-23 17:00 ENMAX RB 16.60L (SS-16 - SS-34) tree trimming 10 Hours
Daily		  
25-May-23 07:00 25-May-23 17:00 ENMAX RB 21.61L (SS-21 - SS-34) tree trimming 10 Hours
Daily		  
25-May-23 07:30 25-May-23 18:00 ALTALINK, ENBRIDGE Outage 769L (377s AML Hardisty - 769BL tap), 769L (296s Rosyth - 769AL tap), 769L (769AL tap - 769BL tap), 769AL (656s Clipper - 769L tap), 769BL (594s Battle Sands - 769L tap), 656s T1 (656s Clipper), 656s 420TX1CB (656s Clipper), 594s 430-TX-1 (594s Battle Sands), 594s 430-TX-2 (594s Battle Sands), 594s 430-TX1 (594s Battle Sands), 594s 430-TX2 (594s Battle Sands), 594s 430-TX1-IS (594s Battle Sands), 594s 430-TX2-IS (594s Battle Sands), 594s 430-SUB-1-MBKR (594s Battle Sands), 296s T1 (296s Rosyth), 296s T2 (296s Rosyth), 296s 152 (296s Rosyth), 296s 11 (296s Rosyth), 296s 4 (296s Rosyth), 296s 1 (296s Rosyth), 296s 2 (296s Rosyth), 296s T3 (296s Rosyth) replace jumpers on structure 769L1 and replace dead-end insulators on structure 7 10.5 Hours
Daily		  
25-May-23 07:30 26-May-23 18:00 ALTALINK Outage 296s T1 (296s Rosyth), 296s T2 (296s Rosyth), 296s T3 (296s Rosyth) T1, T2, T3 tap changer maintenance, T2 & T3 testing and leak repairs, 296s 152 breaker maintenance, 296s T1 metering CT replacement 1.44 Days
Continuous		  
25-May-23 08:00 27-May-23 17:00 ALTALINK TE 535s RTU/SCADA (535s Joffre) SCADA configuration and testing 2.38 Days
Daily		  
25-May-23 08:00 25-May-23 17:00 SUNCOR Outage 635EDD-1001 635-752-621 (635EDD-1001) investigate moisture collecting at the bottom of the operating mechanism cabinet and repair leak 9 Hours
Continuous		  
25-May-23 08:00 03-Jun-23 17:00 ATCO RB 9L32 (838s Horizon Mining - 941s Bitumount), 9L66 (838s Horizon Mining - 847s Muskeg River) ATCO 9L32-9L66 CNRL- Horizon Project
working on the 3 terminal connection on 9L32/9L66, specialized hot line work		 9.38 Days
Continuous		  
25-May-23 08:00 25-May-23 17:00 ALTALINK TE 304s RTU/SCADA (304s Shell Limestone) align satellite dish to new satellite 9 Hours
Daily		  
25-May-23 08:00 25-May-23 17:00 ALTALINK TE 68s RTU/SCADA (68s Willesden Green) align satellite dish to new satellite 9 Hours
Daily		  
25-May-23 08:00 25-May-23 16:00 ENMAX Outage 37.81L (SS-37 - SS-38), 38B138-37.81 (SS-38) HV breaker maintenance 38B138-37.81 8 Hours
Continuous		  
25-May-23 08:00 25-May-23 16:00 ENMAX Outage 32.83L (SS-32 - SS-40), 32B138-32.83 (SS-32) power factor test 32B138-32.83-CT 8 Hours
Continuous		  
25-May-23 09:00 25-May-23 12:00 ATCO Outage 710s 701 (710s Vermilion), 7L117 (706s Irish Creek - 710s Vermilion) 701 PRC testing 3 Hours
Continuous		  
25-May-23 09:00 26-May-23 14:00 ALTALINK TE 535s RTU/SCADA (535s Joffre) update RTU configuration 29 Hours
Daily		  
25-May-23 13:00 25-May-23 15:00 ATCO Outage 710s 707C (710s Vermilion) 707 PRC testing 2 Hours
Continuous		  
25-May-23 18:01 25-May-23 21:00 ALTALINK, ENBRIDGE Outage 769L (377s AML Hardisty - 769BL tap), 769L (296s Rosyth - 769AL tap), 769L (769AL tap - 769BL tap), 769AL (656s Clipper - 769L tap), 769BL (594s Battle Sands - 769L tap), 656s T1 (656s Clipper), 656s 420TX1CB (656s Clipper), 594s 430-TX-1 (594s Battle Sands), 594s 430-TX-2 (594s Battle Sands), 594s 430-TX1 (594s Battle Sands), 594s 430-TX2 (594s Battle Sands), 594s 430-TX1-IS (594s Battle Sands), 594s 430-TX2-IS (594s Battle Sands), 594s 430-SUB-1-MBKR (594s Battle Sands), 594s 430-SUB-1-IS (594s Battle Sands), 296s T1 (296s Rosyth), 296s T2 (296s Rosyth), 296s T3 (296s Rosyth), 296s 152 (296s Rosyth), 296s 11 (296s Rosyth), 296s 4 (296s Rosyth), 296s 1 (296s Rosyth), 296s 2 (296s Rosyth) customer maintenance on 656s 420-TX-1-IS & 594s 430-SUB-1-IS 2.98 Hours
Daily		  
26-May-23 07:00 26-May-23 17:00 ENMAX, ALTALINK RB 833L (SS-2 - SS-12) tree trimming 10 Hours
Daily		  
26-May-23 07:00 26-May-23 17:00 ENMAX, ALTALINK RB 832L (SS-10 - SS-12) tree trimming 10 Hours
Daily		  
26-May-23 07:00 26-May-23 17:00 ENMAX, ALTALINK IO 832L (SS-10 - SS-12) tree trimming 10 Hours
Daily		  
26-May-23 07:00 26-May-23 17:00 ENMAX, ALTALINK IO 833L (SS-2 - SS-12) tree trimming 10 Hours
Daily		  
26-May-23 07:00 26-May-23 17:00 ENMAX RB 54.81L (SS-54 - SS-65) tree trimming 10 Hours
Continuous		  
26-May-23 08:00 26-May-23 12:00 ALTALINK IO 21.80L (42s - C21s) Open ended for Enmax HV breaker SF6 Gas Sample - 21B138-21.80 4 Hours
Daily		  
26-May-23 08:00 26-May-23 12:00 ENMAX Outage 7.84L (SS-7 - SS-36), 36B138-7.84 (SS-36), 7B138-7.84 (SS-7) HV breaker SF6 gas sample - 36B138-7.84 4 Hours
Continuous		  
26-May-23 08:00 26-May-23 16:00 ENMAX Outage 32.1TR (SS-32) broken insulator repair 8 Hours
Continuous		  
26-May-23 09:00 26-May-23 16:00 ATCO Outage 7L130 (705s Kitscoty - 710s Vermilion), 710s 702 (710s Vermilion), 705s 704 (705s Kitscoty) 702 PRC testing and gas top up 7 Hours
Continuous		  
26-May-23 09:00 26-May-23 14:00 ALTALINK RB 418L (281s Johnson - 189L tap), 418L (20s Ghost - 189L tap), 189L (373s Madden - 418L tap) urgent 418L 98 Comp Replacement 5 Hours
Continuous		  
26-May-23 09:30 26-May-23 17:00 ALTALINK RB 731L (420s Broadmoor - 731L tap), 731L (38s East Edmonton - 746L tap), 746BL (337s Canadian Liquid Air - 746L tap) RB: Aerial Maintenance: Washing Program (Spring) 7.5 Hours
Continuous		  
26-May-23 12:00 26-May-23 18:00 ENMAX, ALTALINK Outage 21.80L (42s Sarcee - SS-21), 21B138-21.80 (SS-21), 42s 21 (42s Sarcee) HV breaker SF6 gas sample 6 Hours
Continuous		  
27-May-23 07:00 27-May-23 17:00 ENMAX RB 11.82L (SS-11 - SS-14) tree trimming 10 Hours
Daily		  
27-May-23 08:00 27-May-23 16:00 ENMAX Outage 65B240-D131 (SS-65), 65B240-D132 (SS-65) summer substation washing 65 sub1080PT, D132, D131. 8 Hours
Continuous		  
28-May-23 07:30 05-Jun-23 18:00 CNRL, ATCOP Outage 75-PLH-903 (838s Horizon Mining - 842s Horizon Upgrading), 842s 75-TR-4701 (842s Horizon Upgrading), 842s 75-TR-7701 (842s Horizon Upgrading), 838s 75-BC-1911 (838s Horizon Mining), 838s 75-BC-1918 (838s Horizon Mining), 842s 75-1902 (842s Horizon Upgrading), 842s 75-1902A (842s Horizon Upgrading), 842s 75-1903 (842s Horizon Upgrading), 842s 75-1903A (842s Horizon Upgrading), 842s 75-1903B (842s Horizon Upgrading), 842s 75-4701 (842s Horizon Upgrading), 842s 75-1904 (842s Horizon Upgrading), 842s 75-1904A (842s Horizon Upgrading), 842s 75-1904B (842s Horizon Upgrading), 842s 75-7701 (842s Horizon Upgrading), 842s 75-1905 (842s Horizon Upgrading), 842s 75-1905A (842s Horizon Upgrading) 260kV 5YR PMs and Protective Relay Upgrades 8.44 Days
Continuous		  
28-May-23 07:30 04-Jun-23 18:00 ATCOP, CNRL Outage 838s 75-TR-2701 (838s Horizon Mining), 838s 75-BC-1917 (838s Horizon Mining), 838s 75-BC-1918 (838s Horizon Mining) protective relay testing 7.44 Days
Continuous		  
28-May-23 08:00 04-Jun-23 09:00 ALTALINK Outage 482s T1 (482s Haynes), 482s 784AW (482s Haynes) install and commission new NGR on T1. T1 bushing replacement. T1 doble, maintenance, leaks. breaker maintenance (482s784AW) 7.04 Days
Continuous		  
28-May-23 12:00 01-Jun-23 17:00 ALTALINK Outage 484s T3 (484s Millar Western), 484s 4 (484s Millar Western) T3 Replace 138kV bushings, Replace 484s4 switch (Like for like), Install coresense, T3 major maintenance, Fix leaks, Test T3 4.21 Days
Continuous		  
28-May-23 17:01 11-Jun-23 17:00 ATCO Outage 9L09 (849s Joslyn Creek - 888s Dover), 849s 902 (849s Joslyn Creek), 849s 903 (849s Joslyn Creek) 849s 9L09 protection upgrades 14 Days
Continuous		  
29-May-23 07:00 30-May-23 17:00 EPCOR Outage 816s P2403 (816s Petrolia) Petrolia: P2403 CT Doble 1.42 Days
Continuous		  
29-May-23 07:00 09-Jun-23 18:00 ALTALINK TE 310p RTU/SCADA (310p Sundance) complete SCADA failover to install JBSEC(s), SEL-2440 alarm board(s) and complete the rewiring of physical security sensors in parallel with connections to the existing Fusion RTU 11.46 Days
Daily		  
29-May-23 07:00 02-Jun-23 17:00 EPCOR Outage 72CH9 (987s Clover Bar - EP Hardisty), T3 (EPCOR Hardisty), H724 (EP Hardisty), H723 (EP Hardisty) Hardisty: H723 Breaker Maintenance and CT Doble and TX3 Zone CVT Doble and HAB3, HDS8, HDS9 Disconnect Maintenance 4.42 Days
Continuous		  
29-May-23 07:00 02-Jun-23 17:00 EPCOR Outage 72JW19 (EP 805s Jasper - Woodcroft), T1 (Woodcroft), W721 (Woodcroft), W722 (Woodcroft) Woodcroft: TX1 Tap Changer Leak Repair (043836) 4.42 Days
Continuous		  
29-May-23 07:00 29-May-23 17:00 EPCOR Outage EP 803s T1 (EP 803s Lambton), EP 803s L2401 (EP 803s Lambton), EP 803s L2402 (EP 803s Lambton) pole lighting upgrade project (pole #1) 10 Hours
Continuous		  
29-May-23 07:00 01-Jun-23 17:00 ALTALINK TE 482s RTU/SCADA (482s Haynes) add alarm, RTU configuration change/Hmi updates 3.42 Days
Daily		  
29-May-23 07:00 29-May-23 17:00 ENMAX RB 39.82L (SS-39 - SS-162) tree trimming 10 Hours
Daily		  
29-May-23 07:00 29-May-23 17:00 ENMAX RB 38.83L (SS-38 - SS-39) tree trimming 10 Hours
Daily		  
29-May-23 07:00 29-May-23 17:00 ENMAX RB 37.81L (SS-37 - SS-38) tree trimming 10 Hours
Daily		  
29-May-23 08:00 31-May-23 17:00 ALTALINK Outage 484s T2 (484s Millar Western) fix leaks, maintain and test T2 2.38 Days
Continuous		  
29-May-23 08:00 29-May-23 17:00 SUNCOR Outage 635EDD-1001 635-752-631 (635EDD-1001) 635-752-631; Coil & Latch Assembly replacement. The breaker is presently out of service and will be put back to service after latch replacement 9 Hours
Continuous		  
29-May-23 08:00 01-Jun-23 16:00 ALTALINK TE 482s Haynes S50/51/51N/51NN/T1 out of service 3.33 Days
Continuous		  
29-May-23 08:00 29-May-23 17:00 ALTALINK TE 512s RTU/SCADA (512s Hartell) satellite dish needs to be aligned to new satellite 9 Hours
Daily		  
29-May-23 08:00 29-May-23 17:00 ALTALINK TE 527s RTU/SCADA (527s Coal Valley) satellite dish needs to be aligned to new satellite 9 Hours
Daily		  
29-May-23 08:00 30-May-23 16:00 ENMAX Outage 15.62L (SS-15 - SS-16), 16B69-15.62 (SS-16) breaker maintenance 16B69-15.62 1.33 Days
Continuous		  
29-May-23 08:00 29-May-23 16:00 ENMAX Outage 38.83L (SS-38 - SS-39), 38B138-38.83 (SS-38) Power factor test 38B138-38.83-CT 8 Hours
Continuous		  
29-May-23 08:00 01-Jun-23 16:00 ENMAX Outage 41.2TR (SS-41) Power factor test transformer. Secondary Cable Testing. Transformer Maintenance.  Relay Fault Pressure Test. Oil Sampling MT, TC 3.33 Days
Continuous		  
29-May-23 08:00 01-Jun-23 16:00 ENMAX TE SS-14 14sub 138kV bus differential protection outage. Relay, Settings changes 14RLY138-14.Z31 3.33 Days
Daily		  
29-May-23 08:00 30-May-23 16:00 ENMAX Outage 37.1TR (SS-37) tapchanger maintenance, check reversing switch, 37.1TR MT and LTC oil sample 1.33 Days
Continuous		  
29-May-23 09:00 02-Jun-23 17:00 ALTALINK TE 395s RTU/SCADA (395s North Holden) update config for SCADA upgrade 4.33 Days
Daily		  
29-May-23 09:00 09-Jun-23 17:00 BCH Outage T3 (BCH Natal) Tap changer inspections and doble testing 11.33 Days
Continuous		 AB-BC
29-May-23 09:00 09-Jun-23 17:00 ALTALINK IO B1s T3 BCH - Info Tap changer inspections and doble testing 11.33 Days
Continuous		  
29-May-23 09:00 10-Jun-23 17:30 ATCO TE 7L68 (730s Rycroft - 811s Clairmont Lake) change relay settings to accommodate Telecom outage 2-72665 12.35 Days
Continuous		  
29-May-23 10:00 01-Jun-23 13:00 ATCO Outage 7L794 (157s Lac La Biche - 819s Whitby Lake), 819s 702 (819s Whitby Lake) 702 Complete Maintenance
Open end 7L794 Line		 3.13 Days
Continuous		  
29-May-23 10:00 01-Jun-23 17:30 ALTALINK IO 7L794 (Open-end @ 819s) ATCO - Info ATCO 819s 702 Complete Maintenance 3.31 Days
Continuous		  
29-May-23 10:00 30-May-23 17:30 ATCO TE 951s RTU/SCADA (951s Thickwood Hills) password updates on multiple devices on site, including HMI 31.5 Hours
Continuous		  
29-May-23 10:30 01-Jun-23 16:30 ALTALINK Outage 42s T1 (42s Sarcee), 42s 40 (42s Sarcee) PRC5 doble and oil leaks 3.25 Days
Continuous		  
29-May-23 12:00 30-May-23 16:00 ATCO Outage 2085s 601T (2085s Sheridan), 2085s 601 (2085s Sheridan) transformer maintenance 28 Hours
Continuous		  
29-May-23 12:00 02-Jun-23 17:30 ATCO TE 12L41 (510s Sunnybrook - 939s Livock), 12L44 (939s Livock - 951s Thickwood Hills), 939s RTU/SCADA (939s Livock) password updates on multiple devices on site 4.23 Days
Continuous		  
29-May-23 16:00 05-Jun-23 15:00 ATCO Outage 6L09 (763s Hanna - 776s Richdale) Pole / Arm Replace. 28 Poles to change between D7 & D8
91 Cross Arms to change.		 6.96 Days
Continuous		  
30-May-23 07:00 31-May-23 17:00 EPCOR Outage EP 803s T2 (EP 803s Lambton), EP 803s L2402 (EP 803s Lambton), EP 803s L2405 (EP 803s Lambton), EP 803s LAB2 (EP 803s Lambton) pole lighting upgrade project and TX2 leak investigation 1.42 Days
Continuous		  
30-May-23 07:00 30-May-23 17:00 ENMAX RB 11.81L (SS-11 - SS-13) tree trimming 10 Hours
Daily		  
30-May-23 07:00 30-May-23 17:00 ENMAX RB 13.82L (SS-13 - SS-22) tree trimming 10 Hours
Daily		  
30-May-23 08:00 03-Jun-23 20:00 SUNCOR Outage 29PL9-3 (29EDD-1 Millennium - 29EDD-3) Millennium 260kV bus jumper replacement related to existing 29PL9-3 4.5 Days
Continuous		  
30-May-23 08:00 30-May-23 17:00 ATCO TE ATCO Radio Tower radio upgrade and repair to RAC 4 TX power failure 9 Hours
Daily		  
30-May-23 08:00 01-Jun-23 16:00 ALTALINK Outage 275s T2 (275s Jenner), 275s 46 (275s Jenner), 275s 2252 (275s Jenner), 275s 47 (275s Jenner) install bird cover on T2 reactors and bus work 2.33 Days
Continuous		  
30-May-23 08:00 03-Jun-23 16:00 ATCO, ALBIAN Outage 920s 901T (920s Jackpine), 9LJH1 (919s Hartley - 920s Jackpine) repairs on failed 72kV cable from 901T 4.33 Days
Continuous		  
30-May-23 08:00 30-May-23 17:00 ALTALINK TE 207s MPLS - TPR/RTU upgrade MPLS node & LAN switch replacement 9 Hours
Daily		  
30-May-23 08:00 30-May-23 17:00 ALTALINK TE 411s RTU/SCADA (411s Obed) satellite dish alignment 9 Hours
Daily		  
30-May-23 08:00 30-May-23 17:00 ALTALINK TE 975s RTU/SCADA (975s Dalehurst) satellite dish alignment 9 Hours
Daily		  
30-May-23 08:00 30-May-23 16:00 ENMAX Outage 15.62L (SS-15 - SS-16), 15B69-15.62 (SS-15) power factor test 8 Hours
Continuous		  
30-May-23 08:00 02-Jun-23 17:00 ATCO RB 7L65 (709s Vegreville - 7LA65 tap), 7L65 (710s Vermilion - 7LA65 tap) hold off permit to fix marker cones on 7L65 & 7LA65 3.38 Days
Continuous		  
30-May-23 08:00 30-May-23 17:00 ALTALINK IO 199s East Airdrie Failed RFU 1, requires replacement and testing of radio to ensure functionality, all circuits re-route in 50ms or less. 9 Hours
Daily		  
30-May-23 08:30 01-Jun-23 13:30 ALTALINK Outage 170s T2 (170s Pike) PRC5 maintenance, tap changer major maintenance, test 2.21 Days
Continuous		  
30-May-23 09:00 30-May-23 17:30 ALTALINK Outage 694L (54s Fort Saskatchewan - 422s Westwood), 54s 694 (54s Fort Saskatchewan) 54s694 1st trip and PRC5 maintenance - minor maintenance, inspect alarm cables for corrosion 8.5 Hours
Continuous		  
30-May-23 09:00 30-May-23 10:00 ATCO TE Consort_T-Telecom Consort_T-Telecom
60 Mins
Continuous		  
30-May-23 09:00 31-May-23 17:00 ATCO TE 730s 702T (730s Rycroft) Troubleshoot communication card failure on 87TA/702T relay, block relay 1.33 Days
Continuous		  
30-May-23 13:00 30-May-23 17:00 VISIONREQ TE 354s Summerview replace MDA 1/1 for internal fault, 624L (312s-354s) TPR A-CHY, B-CH1 & B-CH2 & 354s-103s RAS A 4 Hours
Daily		  
31-May-23 05:30 31-May-23 17:30 Lafarge Canada Outage 985s 811TF01 (985s Exshaw), 985s 811TF02 (985s Exshaw), 985s T3 (985s Exshaw), 985s 811QC03 (985s Exshaw), 985s 811QC04 (985s Exshaw), 985s 811QS01 (985s Exshaw), 985s 811QS02 (985s Exshaw), L300 (1020s Exshaw extension - 985s Exshaw), 1020s T1 (1020s Exshaw Extension) maintenance 12 Hours
Continuous		  
31-May-23 07:00 02-Jun-23 17:00 EPCOR Outage 1164L @ Petrolia E816S and Riverview, 1164L (816s Petrolia - EP Riverview) Petrolia: 1164L CT/Arrestor Doble and PDS12 Disconnect Maintenance 2.42 Days
Continuous		  
31-May-23 07:00 31-May-23 17:00 ENMAX, ALTALINK RB 37.82L (74s Janet - SS-37) tree trimming 10 Hours
Daily		  
31-May-23 07:00 31-May-23 19:00 ALTALINK Outage 781L (71s Lamoureux - 172s Sherritt) Urgent replacement of 781LCVT. 12 Hours
Daily		  
31-May-23 07:00 31-May-23 17:00 ENMAX, ALTALINK RB 37.82L (74s Janet - SS-37) tree trimming 10 Hours
Daily		  
31-May-23 07:00 31-May-23 17:00 ENMAX RB 41.84L (SS-41 - SS-54) tree trimming 10 Hours
Daily		  
31-May-23 08:00 31-May-23 17:00 ALTALINK Outage 949L(275s-306s) GOI, 949L (275s Jenner - 306s Halsbury) Disconnect fibre connection inside Jenner control building, pull fibre back to pole structure, install expansion joints in PVC. Re-pull and re-connect fibre, perform OTDR test. 9 Hours
Daily		  
31-May-23 08:00 31-May-23 18:00 ALTALINK TE 253s RTU/SCADA (253s Blackie) upgrade MPLS node 10 Hours
Daily		  
31-May-23 08:00 01-Jun-23 12:00 ATCO Outage 2085S 602T, 2085S 602T Protection, 2085s 602T (2085s Sheridan) transformer maintenance 28 Hours
Continuous		  
31-May-23 08:00 31-May-23 17:00 ALTALINK TE 48s - RTU Satellite dish needs to be aligned to new satellite. Supervisory outage to 48s during outage.. 9 Hours
Daily		  
31-May-23 08:00 31-May-23 17:00 ALTALINK IO Altalink EMS Update - Info Only transition of ACC to AECC and back as part of the Altalink EMS upgrade - contigency date pending April 26th work. AECC/ACC activations to be managed as per the normal procedures, and no changes to the normal activities associated with activations - Conducted as per normal procedures with ACC operators & AESO SC's. 9 Hours
Daily		  
31-May-23 08:00 13-Jun-23 18:00 SUNCOR Outage 29EDD-94 29EDD94; Breaker MTCE & TEST, PM 10y on breakers 29-452-6704, 29-452-6703, 29-452-6702, 29-452-8407, 29-452-8406, 29-452-8405, 29-452-8404, 29-452-8403, 29-452-8402, 29-452-8502, 29PT-406, corrective work on 29PL4-245 13.42 Days
Continuous		  
31-May-23 08:00 31-May-23 17:00 ALTALINK TE 887s RTU/SCADA (887s Carson Creek) satellite dish needs to be aligned to new satellite 9 Hours
Daily		  
31-May-23 08:00 31-May-23 17:00 ALTALINK TE 996s RTU/SCADA (996s Imperial Oil Carson Lake) satellite dish needs to be aligned to new satellite 9 Hours
Daily		  
31-May-23 08:00 01-Jun-23 16:00 ENMAX Outage 37.81L (SS-37 - SS-38) HV breaker maintenance 37B138-37.81. Power factor test 38B138-37.81-CT 1.33 Days
Continuous		  
31-May-23 08:00 31-May-23 16:00 ENMAX Outage 14.83L (SS-14 - SS-36) Breaker Trip Circuit Test - 14B138-14.83 8 Hours
Continuous		  
31-May-23 08:00 31-May-23 16:00 ENMAX Outage 14.83L (SS-14 - SS-36), 16.63L (SS-16 - SS-36), 36.2TR (SS-36), 36.5TR (SS-36) Power factor test 36PT138-Z32. 8 Hours
Continuous		  
31-May-23 08:00 01-Jun-23 16:00 ENMAX Outage 2.4TR (SS-2) Tapchanger maintenance. Check reversing switch. Oil Sampling MT, TC. Gas Monitor Maintenance - 2.4TR 1.33 Days
Continuous		  
31-May-23 08:30 01-Jun-23 17:30 ALTALINK Outage 535s T5 (535s Joffre) doble test & investigate bushing monitor fail alarm 1.38 Days
Continuous		  
31-May-23 10:00 31-May-23 12:00 ALTALINK TE 250p RTU/SCADA (250P Bighorn Plant), 48s RTU/SCADA (48s Pocaterra) RigSat Comm/RTU outage 2 Hours
Daily		  
01-Jun-23 07:00 02-Jun-23 17:00 EPCOR Outage TX2 Expanded Zone (240BA3 Open Ended) @ Bellamy E814S and Argyll Transfer Station E629S, 814s T2 (814s Bellamy), 240BA3 (629s Argyll Transfer Station - 814s Bellamy) Bellamy: TX2 Zone P&C Maintenance and Op Checks 1.42 Days
Continuous		  
01-Jun-23 08:00 03-Jun-23 17:00 SUNCOR Outage Unmodeled Transmission Facility (Suncor) 635PL6-1004 2.38 Days
Continuous		  
01-Jun-23 08:00 01-Jun-23 13:00 Lethbridge Outage 823L (146s MacDonald - 593s Lakeview) OPEN END OUTAGE TO ENERGIZE 146S T2 NEW TRANSFORMER 5 Hours
Continuous		  
01-Jun-23 08:00 01-Jun-23 13:00 ALTALINK IO 823L (L146s) CofL - Info Open ended to energize new 146s T2 5 Hours
Daily		  
01-Jun-23 08:00 10-Jun-23 20:00 Syncrude Outage Non-Significant Outage: Transformer T1 Outage in Plant 31 to complete 6 year PM and repair the Transformer Tap Changer. CB # 135 and 1335 @ Plant 31 Switchyard will be operated. The following disconnect switches will be operated: 134 @ Plant 31 Switchyard, Mildred T1 (Syncrude Mildred Lake) Non-Significant Outage: Transformer T1 Outage in Plant 31 to complete 6 year PM and repair the Transformer Tap Changer.

CB # 135 and 1335 @ Plant 31 Switchyard will be operated.

The following disconnect switches will be operated:
134 @ Plant 31 Switchyard		 9.5 Days
Continuous		  
01-Jun-23 08:00 01-Jun-23 16:00 ENMAX Outage 32.83L (SS-32 - SS-40), 32B138-32.83 (SS-32) power factor test 32B138-32.83-CT
8 Hours
Continuous		  
01-Jun-23 08:00 01-Jun-23 16:00 ALTALINK IO 510s Sunnybrook Test Phasor Measurement Units on ACF1, ACF2, T11 8 Hours
Daily		  
01-Jun-23 08:00 01-Jun-23 17:00 ALTALINK TE 515s RTU/SCADA (515s Fedpipe Judy Creek) Satellite dish needs to be aligned to new satellite. Loss of visibility of 515s. 9 Hours
Daily		  
01-Jun-23 08:00 01-Jun-23 17:00 ALTALINK TE 638s RTU/SCADA (638s Esso Judy Creek) Satellite dish needs to be aligned to new satellite. Loss of visibility of 638s. 9 Hours
Daily		  
01-Jun-23 08:00 07-Jun-23 17:00 SUNCOR TE Suncor RTU/SCADA (Suncor) FH - (Fort Hills), a few adjustments in the FW configurations may be required during the preliminary T&D HVCC Control Center Upgrade integration testing, which may result in brief communication/visibility outages. Any data interruptions should be less than 10 minutes 6.38 Days
Daily		  
01-Jun-23 08:30 01-Jun-23 17:30 ALTALINK Outage 834L (320p Keephills - 384s Keystone), 320p 834X (320p Keephills) Maintenance on 320p834X including 1st trips 9 Hours
Daily		  
01-Jun-23 09:00 01-Jun-23 13:00 ATCO TE Debolt_T-Telecom supervisory outage 4 Hours
Continuous		  
01-Jun-23 09:00 01-Jun-23 12:00 ATCO TE 811s 707 (811s Clairmont Lake) 811S 707 50BF Relay Settings Changes. 3 Hours
Continuous		  
01-Jun-23 10:00 01-Jun-23 12:00 ATCO TE McClelland_S-Telecom, Secord_S-Telecom McLelland and Secord Net 1 Router OS upgrades
Approx 15 min outage to the following ccts:
TPRFF153 / 9L32 A SECORD / JOSLYN
TPRFF172 / 9L32 9L101 A SECORD / MCLELLAND
TPRFF174 / 9L32 / 9L101 B SECORD / MCLELLAND
SUPEP036 SECORD SUB SCADA
TPRCP039 / 9L32 / 9L01 RAS B JOSLYN / MCLELLAND
IPPFF002 MCLELLAND (IOL KEARL SCADA)
SUPEP125 MCLELLAND SUB SCADA
RASCP013 / #155 RAS A MCCLELLAND / HORIZON
TPRCP057 / 9L32 A HORIZON / SECORD		 2 Hours
Continuous		  
01-Jun-23 13:00 01-Jun-23 14:00 ATCO TE Secord_S-Telecom Secord net 11 SAR OS upgrade - Redundant Protection In Service
Approx. 15 min outage to the following traffic:
Redundant Protection will be in service.
TPRCP040 / 9L32 / 9L101 RAS A Joslyn / McClelland
TPRFF154 / 9L32B Joslyn / Secord
TPRCP058 / 9L32 B Horizon / Secord
TPRCP207 / 9L66-9L32 B Muskeg / Secord
RASCP014 / #155 KEARL RAS B McLelland / Horizon		 60 Mins
Continuous		  
02-Jun-23 08:00 02-Jun-23 17:00 ALTALINK TE 165s RTU/SCADA (165s Gainford) satellite dish needs to be aligned to new satellite 9 Hours
Daily		  
02-Jun-23 08:00 02-Jun-23 17:00 ALTALINK TE AltaLink Radio Station, 14s RTU/SCADA (14s Devon) upgrade MPLS node and LAN switch replacement 9 Hours
Daily		  
02-Jun-23 08:00 15-Jun-23 17:00 ALTALINK TE 385s RTU/SCADA (385s Spring Coulee) updating RTU configuration 13.38 Days
Daily		  
02-Jun-23 09:00 02-Jun-23 10:00 ATCO TE ATCO Radio Tower upgrade Joslyn_S-Telecom net 11 SAR OS 60 Mins
Continuous		  
02-Jun-23 10:00 02-Jun-23 11:00 ATCO, ATCOP, CNRL TE ATCO Radio Tower, 849s RTU/SCADA (849s Joslyn Creek), 838s RTU/SCADA (838s Horizon Mining) upgrade Joslyn_S-Telecom net 1 SAR OS 60 Mins
Continuous		  
02-Jun-23 21:00 04-Jun-23 20:00 ALTALINK Outage 38s T1, 138kV Bus 1, & 293s - GOI, 38s T1 (38s East Edmonton), 38s C1 (38s East Edmonton), 38s C2 (38s East Edmonton), 737L (38s East Edmonton - 95s Imperial Oil Edmonton), 736L (38s East Edmonton - 293s Bernese), 865L (38s East Edmonton - 216s Knightsbridge) Replace 38s736CT’s, replace insulators on 7 switches and 15 post insulators and perform transformer maintenance on 293sT1 and 293sT2. 1.96 Days
Continuous		  
02-Jun-23 21:00 04-Jun-23 20:00 ALTALINK Outage 95s T2 (95s Imperial Oil Edmonton) 95s T2 testing and neutral insulator replacement 1.96 Days
Continuous		  

Prepared On:   2023-05-24   15:22:23

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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