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2009 State of the Market Report

Transmission Congestion

A.

Real-Time Congestion Costs

Figure 49 shows the total congestion costs incurred in the day-ahead and real-time markets from 2007 through 2009.

Congestion Cost ($ Millions)

$200

$150

$100

$50

$0

2007

2008

2009

632,878,942

500,251,809

304,521,602

81,862,328

79,777,492

7,632,244

Figure 49: Total Congestion Costs 2007 – 2009

DA Congestion Cost RT Congestion Cost

  • -

    $50

J F M A MJ J A S O N D J F MA M J J A S O N D J F M A M J J A S O N D

2007

2008

2009

Day-ahead congestion costs declined by nearly $200 million (39 percent) in 2009 compared to 2008. This reduction was due to reduced natural gas prices (which lower redispatch costs), lower average load, and transmission improvements. Day-ahead congestion costs were higher in the last four months of the year as economic conditions improved and natural gas prices increased.

Real-time balancing congestion is congestion that settles based on real-time market results. Normally, one would expect the real-time-congestion costs to be minimal if modeling of the transmission system is consistent between the day-ahead and real-time markets. In other words, congestion costs collected in the real-time market occur only when the transmission limits decrease from those in the day-ahead market model or when loop flow increases from the levels

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