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2009 State of the Market Report

Transmission Congestion

Figure 53: FTR Underfunding and Day-Ahead Congestion Radial Constraints, 2009

$2.0

Congestion / FTR Oblig. ($ Millions)

$1.8

$1.6

$1.4

$1.2

$1.0

$0.8

$0.6

$0.4

Day-Ahead Congestion Cost FTR Underfunding FTR Obligations for Radial Constraints

$ 2,217,526 $ 3,571,136 $ 5,788,662

$0.2

$0.0

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Figure 53 above shows day-ahead congestion and FTR shortfalls for radial constraints. Day- ahead congestion costs on radial constraints totaled $2.2 million, while FTR obligations on these constraints totaled nearly $5.8 million. On a percentage basis, radial constraints generated roughly one percent of the day-ahead congestion costs but accounted for almost 8 percent of the FTR shortfalls. The Midwest ISO is taking steps to limit shortfalls by including radial constraints in the FTR market. However, we recommend the Midwest ISO work to remove these constraints from the day-ahead market since this congestion cannot exist in the real-time market.

C.

Value of Congestion in the Real-Time Market

In this subsection, we study congestion patterns in the real-time market. We focus here on the value of real-time congestion, rather than the day-ahead and real-time balancing congestion costs collected by the Midwest ISO that were discussed in the previous subsection. This difference is important because the Midwest ISO does not collect congestion costs for all the actual flows

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