1. First to Curtail – Last to Curtail Examples December 1 - 2, 2010 1

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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