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Figure 1.
TLR MWh by Flowgate
Figure 2.
TLR MWh by Day
Figure 3.
TLR MWh by Month
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The TLR records provide interesting insights
into where and when transmission limits disrupt electricity
trading in the U.S. Eastern Interconnection. Examining
and summarizing the curtailed transactions from May 1, 1998
to March 1, 1999 (level 3 and above actions) we observed:
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A total of 186,802 MWHrs
were curtailed.
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There were 56 curtailment
incidents counted.
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Twenty (20) flowgates were
the cause of all level 3 and above curtailments.
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86 % of the MWHrs curtailed
were caused by 4 flowgates (Figure 1).
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The Arpin – Eau Claire
flowgate was the most frequent curtailment cause (16
incidents).
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The Curtailments causing
the most MWHrs curtailment per incident were in Ontario
Hydro and Entergy.
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Monday, Thursday and Friday
were the most impacted days of the week (Figure 2).
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More curtailments occurred
in June than any other month (Figure 3).
These data and conclusions are the sole interpretation
of PTI and may be based on incomplete or misinterpreted
information from the TLR event postings.
Only PSS™MUST is capable
of modeling the impact of transactions and generator redispatch
on flowgates. It is the calculation tool at the heart of
the TLR curtailments summarized here.
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