First to Curtail – Last to CurtailExamples

December 1 – 2, 2010(Revised based on Requests/Suggestions During Review)

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Example 1 - On the Path – Last to Curtail

BA 2

BA 1

BA 3

BA 4

- Firm Transmission Service purchased from BA-1 to BA-3

- No Seams Agreement exist between the BAs

- Firm Transaction Flows goes in Last to Curtail for a constraint on BA-1 or BA-3 systems

- Firm Transaction Flow goes in First to Curtail for BA-2 or BA-4 systems

2In the examples a constraint caused by another entity is based on the minimum IDC Threshold.

Example 2 - Wheel Through– Last to Curtail

BA 2

BA 1

BA 3

BA 4

- Firm Transmission Service purchased from BA-1 to BA-3 to BA-4

- No Seams Agreement exist- Firm Transaction Flow goes in

Last to Curtail for a constraint on BA-1, BA-3 or BA-4 systems

- Firm Transaction Flow goes into First to Curtail for a constraint on BA-2 system

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Example 3 – Intra-BA with Seams Agreement

BA 2

BA 1

BA 3

BA 4

- Intra-BA Firm Transmission Service purchased in BA-2

- Seams Agreement between BA-2 and BA-3

- No additional Seams Agreements are executed

- Firm Transaction Flow goes in Last to Curtail for a constraint on BA-2 or BA-3 systems

- Firm Transaction Flow goes in First to Curtail for a constraint on BA-1 or BA-4

4Seams Agreements reflect honoring the other party’s flowgates when the service is sold.

Example 4 – Inter-BA With Seams Agreement

BA 2

BA 1

BA 3

BA 4

- Firm Transmission Service purchased from BA-1 to BA-2

- No Firm Transmission Service purchased through BA-3 or BA-4

- Seams Agreement between BA-2 and BA-3

- No additional Seams Agreements executed

- Firm Transaction Flow goes in Last to Curtail for a constraint on BA-1, BA-2, or BA-3 systems

- Firm Transaction Flow goes in First to Curtail for a constraint on BA-4

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Example 5 – Inter-BA – Without Seams Agreement

BA 2

BA 1

BA 3

BA 4

- Firm Transmission Service purchased from BA-1 to BA-2

- No Firm Transmission Service sold through BA-3

- No Seams Agreements are executed

- Firm Transmission Flow goes in Last to Curtail for constraint on BA 1 and BA 2 systems

- Firm Transmission Flow goes in First to Curtail for constraint on BA-3 and BA-4 systems

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Example 6 – Intra-BA – Without Seams Agreement

BA 2

BA 1

BA 3

BA 4

- Intra BA Firm Transmission Service Purchased in BA-2

- No Seams Agreements are executed

- Firm Transaction Flow goes in First to Curtail for constraint on BA-1, BA 3, and BA-4 systems

- Firm Transaction Flow goes to Last to Curtail for a constraint on BA-2 system

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Example 7 – Generation to Load – With Seams Agreement

BA 2

BA 1

BA 3

BA 4

- Firm GTL Flows in BA-1- Seams Agreement between

BA-1 and BA-2- No Seams Agreements exists

with other BAs - Firm GTL Flows goes in Last to

Curtail for constraint on BA-1 and BA-2 systems

- Firm GTL Flow goes in First to Curtail for BA-3 and BA-4 systems

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Example 8 - Generation To Load – With Seams Agreements (2)

BA 2

BA 1

BA 3

BA 4

- Firm GTL Flows reported for BA-1

- Seams Agreement between BA-1 and BA-2

- Seams Agreement between BA-1 and BA-3

- Seams Agreement between BA-3 and BA-4

- No Seams Agreement between BA-1 and BA-4

- Firm GLT Flow goes in Last to Curtail for constraint on BA-1, BA-2, and BA-3 systems

- Firm GTL Flow goes in First to Curtail for constraint on BA-4 system

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Example 9 – Generation To Load – Without Seams Agreement

BA 2

BA 1

BA 3

BA 4

- Firm GTL Flow reported in BA-1

- No Seams Agreements exist- Firm GTL Flow goes in Last to

Curtail for constraint on BA-1 system

- Firm GTL Flow goes in First to Curtail for a constraint on BA-2, BA-3 or BA-4 systems

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