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An energy price of around $100k at a node dictates an infeasibility in reserves. i.e. there is insufficient FIR/SIR to cover the risk and so limits the price at $100k (or $200k if both are infeasible)
An energy price of around $500k at a node dictates an infeasibility in energy.
If these happen in realtime they tend to "wash out" when it comes to the final pricing run.
dantheperson: And whats that mean in plain english?
Prices are very high when demand is high, but it's often reconsidered and lowered later.
Interesting - Flick said in their latest bill that the prices for 11/7/16 are still interim. So far today they still are. (which means that Flick has marked that day as estimated prices). Presumably someone has challenged them which would explain why they are not final yet. The only possible problem I can see is that they were quite low for the whole day. Good for me as the wholesale price for my node at 5pm was only 4.9c per unit. But a definite problem for the generators.
Posting this to provide some balance to the above posts about price spikes.
And for those wanting to know what FIR and SIR are
https://www.youtube.com/watch?list=PLXUccGn4ptEOiBgyrpEYMIl0xvB4W67qK&v=fPmJFfKn4zk
Playlist from Transpower explaining how the power reserves system works.
(edit - couldn't figure out how to embed a youtube playlist instead of only 1 video)

Aredwood:
Interesting - Flick said in their latest bill that the prices for 11/7/16 are still interim. So far today they still are.
There is a pricing error claim in I believe in relation to the metering at one of the generation nodes.
Interesting video series, but it lost me near the end. The playlist works fine.
Prices are extremely high in the North Island right now - 1000X times higher than normal. Hopefully this one equalises out. Not sure why it's so high, the South Island prices are normal and the link cable has spare capacity.

timmmay:
Prices are extremely high in the North Island right now - 1000X times higher than normal. Hopefully this one equalises out. Not sure why it's so high, the South Island prices are normal and the link cable has spare capacity.
Doesn't 1 day at 1000x a higher price wipe out an entire years benefit of being on wholesale rates?
It seems amazing that prices can go that high -- effectively they are telling everyone to shutdown for the day, which would make the NZ power market more like zimbabwe!!!
[edit] it seems to me, this market structure encourages lack of investment and shortages.
surfisup1000:
Doesn't 1 day at 1000x a higher price wipe out an entire years benefit of being on wholesale rates?
It seems amazing that prices can go that high -- effectively they are telling everyone to shutdown for the day, which would make the NZ power market more like zimbabwe!!!
[edit] it seems to me, this market structure encourages lack of investment and shortages.
High prices aren't actual prices, they're just the market's way of encouraging additional generation to come online quickly. The prices rationalise down to regular levels a few days later. Have a look at the youtube video series posted on the last page, it's pretty interesting.
We had a few spikes last year and I saved around $650. We have a few more spikes this winter, but I expect to save more this year, as I've put hot water on a timer. The hot water timer hasn't done as much as I'd expected though, it has taken my average weekly savings from the 20-25% range to the 30- 35% range. Saving an additional 10% is good though, long term it makes sense, and it reduces your vulnerability to spikes.
timmmay:
I don't know if you can switch suppliers during a crisis year. They may have long term contracts, and you can sign up online.
As long as you are not locked into a contract for a period of time, as a residential consumer you are free to switch as you want - there are no restrictions on movement.
If you lock yourself into a term contract (also advertised as a "fixed price" contract) then you could switch you might just need to pay a break fee.
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