Yesterday evening I noticed this tweet from TasNetworks noting about customers off supply because of severe weather in the south-east of the state:
Overnight I see a series of Market Notices issued by AEMO speaking about various transmission lines tripping … the cause of which is not stated (but I am guessing might have something to do with this severe weather):
Market Notice
Details
MN 96962
Sat 11th 21:18:16
This one says:
‘Inter-regional transfer limit variation – Chapel St – Gordon No. 2 220 kV Line – Tas region – 11/06/2022
At 2106 hrs 11/06/2022 there was an unplanned outage of Chapel St – Gordon No. 2 220 kV Line
Constraint sets invoked: T-CSGO, F-T-CSGO’
MN 96964
Sat 11th 23:12:09
This one says:
‘At 2229 hrs the Palmerston – St Marys tee Avoca 110 kV Line tripped and Mussleroe Wind Farm reduced output by approximately 135 MW.
AEMO did not instruct load shedding.
Approximately 9 MW load was lost.’
MN 96965
Sun 12th 02:01:19
This one says:
‘At 0131 hrs the Burnie – Hampshire 110 kV Line tripped at the Burnie end only.
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.’
MN 96966
Sun 12th 05:36
This one says:
‘At 0456 hrs the Burnie – Hampshire 110 kV Line tripped. At the same time the Burnie – Sheffield No. 2 110 kV Line tripped at the Burnie end only and Studland Bay WF tripped from 62 MW
AEMO did not instruct load shedding.
AEMO has not been advised of any disconnection of bulk electrical load.’
MN 96967 (refers to 96964)
Sun 12th June 09:04:53
This one says:
‘At 2229 hrs the Palmerston – St Marys tee Avoca 110 kV Line tripped and Mussleroe Wind Farm reduced output by approximately 135 MW.
The cause of this non credible contingency event is not known at this stage
AEMO is not satisfied that this non credible event is unlikely to re-occur.
AEMO has therefore reclassified this event as a credible contingency event until further notice.
Region: Tas
Duration: 12/06/2022 08:45 until further notice
Constraint set(s) invoked: Nil’
Sounds like a busy period for the TasNetworks team.
Paul was one of the founders of Global-Roam in February 2000. He is currently the CEO of the company and the principal author of WattClarity. Writing for WattClarity has become a natural extension of his work in understanding the electricity market, enabling him to lead the team in developing better software for clients.
Before co-founding the company, Paul worked as a Mechanical Engineer for the Queensland Electricity Commission in the early 1990s. He also gained international experience in Japan, the United States, Canada, the UK, and Argentina as part of his ES Cornwall Memorial Scholarship.
Based on forecasts NEMMCO had been providing through their PASA process, we expected that it might prove that this week would deliver huge demand levels, and high prices.
Not to disappoint, the market did deliver high levels of demand in all regions:
(a) Peak demand levels were reduced somewhat from the huge levels the previous week in Victoria and South Australia;
(b) Demand levels were also still building to the record level to be experienced the following week in NSW;
(c) Peak demand levels in Queensland were fairly steady (and high) for most weeks of summer.
(d) In combination, a new NEM-wide peak demand target of 30,994MW was set on Monday 23rd January.
A preliminary look at a number of events that happened today, leading to prices spiking to the Market Price Cap in a number of regions, Demand Side Response being very active, and trading desks being very busy.
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