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2009 State of the Market Report

Transmission Congestion

Figure 57: Unmanageable Constraints 2008 – 2009

1,200

Number of Constrained Hours

1,000

800

600

400

200

Unmanageable Manageable

0

08 09 J F M A M J

J A S OND J FMAM J

J A S OND

2008

2009

Figure 58: Value of Real-Time Congestion by Path 2007 – 2009

$600

60%

Congestion Value ($ Millions)

$500

$400

$300

$200

Unmanageable Manageable Share Unmanageable

39%

30%

26%

15%

50%

40%

30%

20%

Share of Congestion Value

$100

10%

$0

0%

2007

2008

2009

2007

2008

2009

2007

2008

2009

2007

2008

2009

69-115 kV

138 kV

161-230 kV

345 kV

Page 88

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