First to Curtail – Last to CurtailExamples

December 1 - 2, 2010

1

On the Path – Last to Curtail

BA 2

BA 1

BA 3

BA 4

- Firm Service purchased from BA 1 to BA 3-No Seams Agreement- Firm Flow BA 1 to BA 3- Flow goes in Last to Curtail for a constraint on BA 1 or BA 3 systems

2

Wheel Through– Last to Curtail

BA 2

BA 1

BA 3

BA 4

- Firm Service purchased from BA 1 to BA 3 to BA 4-No Seams Agreement- Firm Flow BA 1 to BA 3 to BA 4- Flow goes in Last to Curtail for a constraint on BA 1, BA 3 or BA 4 systems

3

Parallel Flow Seams Agreement 2 BAs – Last to Curtail

BA 2

BA 1

BA 3

BA 4

-Intra BA Service sold in BA 2- No service sold through BA 3-Seams Agreement between BA 2 and BA 3- Flow goes in Last to Curtail for a constraint on BA 2 or BA 3 systems

4

Parallel Flow with Seams Agreement – Last to Curtail

BA 2

BA 1

BA 3

BA 4

-Firm Service purchased from BA 1 to BA 2- No Service sold through BA 3- Seams Agreement between BA 2 and BA 3- Flow goes in Last to Curtail for a constraint on BA 1, BA 2, or BA 3 systems

5

Parallel Flow 3 BAs – First to Curtail

BA 2

BA 1

BA 3

BA 4

-Firm Service purchased from BA 1 to BA 2- No Service sold through BA 3-No Seams Agreement with BA 3- Parallel Flow through BA 3- Flow goes in First to Curtail for constraint on BA 3 system and Last to Curtail for constraint on BA 1 and BA 2 systems

6

Parallel Flow 2 BAs – First to Curtail

BA 2

BA 1

BA 3

BA 4

-Intra BA Service Sold- No Service sold through BA 3-No Seams Agreement with BA 3- Parallel Flow through BA 3 -Flow goes in First to Curtail for constraint on BA 3 System and Last to Curtail for a constraint on BA 2 system

7

Generator Priority – Last to Curtail

BA 2

BA 1

BA 3

BA 4

- GTL identified as Firm on BA 1- Seams Agreement with BA 2- Parallel flow through BA 2-Flow goes in Last to Curtail for Constraint on BA 1 or BA 2

8

Generator Priority – First to Curtail

BA 2

BA 1

BA 3

BA 4

- GTL identified as Firm on BA 1- No Seams Agreement with BA 2- Parallel Flow through BA 2- Flow goes in Last to Curtail for constraint on BA 1 system and First to Curtail for a constraint on BA 2 system

9