Historical Hydro-Quebec Phase II Flow and Transfer Capability Limit Data Peter Wong, ISO New England Power Supply Planning Committee Meeting June 4, 2007 Agenda Item PSPC Meeting 229 June 4, 2007

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 2 Historical data presented at the April 19, 2007 PSPC meeting

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 3 Historical HQ Phase II Total Transfer Capability and Energy Flows ISO investigated historical Phase II Total Transfer Capability and energy flows during the January 2003 through August 2006 period. Results show that when loads are at 24,000 MW or above: –The Total Transfer Capability was equal to or greater than 1,400 MW approximately 85% of the time. –There is some uncertainty with the historical Total Transfer Capability data because the default TTC is set at 2,000 MW and it is not adjusted by the operator if the expected energy flow on the HQ Phase II is low. For example, if the TTC shows a 2,000 MW value and the scheduled energy flow is 200 MW, then the operator does not check the actual limits and as a result, the TTC is not updated to reflect the actual limit. –These data are consistent with actual flow data, as energy imports from the HQ Phase II tie were seldom higher than 1,400 MW, especially at high loads.

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 4 Historical HQ Phase II Energy TTC January 2003 through August 2006 HQ Phase II Total Transfer Capability

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 5 Historical HQ Phase II Energy TTC January 2003 through August 2006 HQ Phase II Total Transfer Capability TTC (MW)Count% of TTC% Cumulative

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 6 Historical HQ Phase II Energy Flows January 2003 through August 2006 Energy Flow vs. NE Hourly Load

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 7 Graphs presented at the May 17, 2007 PSPC meeting

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 8 Hydro-Quebec Phase II TTC and Flow All Hours

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 9 Hydro-Quebec Phase II TTC and Flow Summer On-Peak Hours

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 10 Additional Graphs and data as you have requested at the May 17, 2007 PSPC meeting

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 11 HQ Phase II Flow and Transfer Capability Limit During the Top Ten Summer Peak Load Days Hours

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 12 HQ Phase II Flow and Transfer Capability Limit During the Top Ten Summer Peak Load Days at Hour of Daily Peak Limit Data Not Available in 2004

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 13 Hydro-Quebec Phase II Flow and Transfer Capability Limit Top Ten Summer Daily Peak Load Days at Hour of Peak

Hydro-Quebec Phase II Flow and Transfer Capability Limit Data © 2007 ISO New England Inc. 14 Questions & Comments ?