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2009 State of the Market Report

Transmission Congestion

in 2009, down from 72 percent in 2008. Moreover, 31 percent of all market-to-market congestion occurred on one constraint.

Figure 55: Value of Real-Time Congestion by Type of Constraint 2007 – 2009

$250

RT Congestion Value ($ Millions)

$200

$150

$100

$50

$0

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

2007

2008

2009

2007

2008

2009

2007

2008

2009

2007

2008

2009

Internal

MISO M2M

PJM M2M

External

Congestion on non-Midwest ISO-managed constraints (PJM market-to-market and external constraints) was a relatively small portion of overall real-time congestion in 2009. PJM market- to-market congestion fell 32 percent to $72 million, while external congestion fell nearly 50 percent to $10 million.

D.

TLR Events

The Midwest ISO continues to use TLR procedures and the NERC Interchange Distribution Calculator to support certain aspects of congestion management. Prior to the introduction of the energy markets, virtually all of the congestion management for Midwest ISO transmission facilities was accomplished through the TLR procedure, an Eastern Interconnection-wide process that allows reliability coordinators to mitigate potential or actual operating security limit violations while respecting transmission service reservation priorities. When a constraint is binding, the real-time dispatch model manages the flow over the constrained transmission

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