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2009 State of the Market Report

Competitive Assessment

to the fact that rivals’ resources will be more fully-utilized serving load under these conditions, leaving only the highest-cost resources to respond to the withholding.

The effect of load on potential market power was evident earlier in this section in our pivotal supplier analyses. Accordingly, Figure 77 through Figure 80 below show the output gap results by load level and size of participant for each of the four regions within the Midwest ISO. The average output gap quantities are shown for the largest two suppliers in each region versus the other suppliers. The figures also show the average output gap at the mitigation thresholds and at one-half of the mitigation thresholds (the high and low thresholds discussed previously).

Figure 77: Real-Time Market Output Gap Central Region – 2009

2.0%

Percentage of Capacity in Category

1.5%

1.0%

0.5%

0.0%

Other Top2

Other Top2

Other Top2

Other Top2

Other Top2

Other Top2

Other Top2

Offline Units Online and Quickstart

Other Top2

Other Top2

Other Top2

Up to 60 60 to 70 70 to 80 80 to 90 90 to 100 Up to 60 60 to 70 70 to 80 80 to 90 90 to 100

Low Threshold

High Threshold

MISO Load Level (GW)

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