AEMO NEM Operations Review Queensland Summer 2012 855 871 Congestion
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From January 2012 to March 2012, a number of market pricing events occurred in Queensland.
Since January, the constraint equations that manage the post contingent flows on the Calvale – Stanwell No.855 and Calvale – Tarong No.871 275 kV lines have increased in profile, due to the constraints binding frequently and causing large counter priced flows from Queensland to New South Wales.
This is most likely the result of participants attempting to manage their volume risk whenever the constraint binds as a result of changes to the dynamic ratings of the lines. More recently, legitimate generator bidding behaviour is influencing spot price volatility around the time of network constraints.
AEMO considers that network congestion issues will continue to arise, but the events of summer 2012 demonstrate that their market impact is as much an outcome of the electricity market design as network limits or participant behaviours. AEMO recommends the review be noted in the context of the Australian Energy Market Commission’s (AEMC’s) transmission frameworks review.
For further information on this document, please contact: Brian Nelson, Electricity Market Performance
Electricity Market Event Report – NEM Operations Review – Queensland Summer 2012 (855/871 Congestion)
07 Jun 2012 | filename: 0180-0016.pdf