Enhanced Curtailment Calculator Task Force Report

Enhanced Curtailment Calculator

• Tool to determine appropriate curtailment of transmission system use when overloads occur.

• Originally proposed through the Efficient Dispatch Toolkit.

• This would be a reliability tool for use with or without the Energy Imbalance Market.

Need for the Tool

• Transmission system is under more strain due to desire to efficiently utilize assets

• Variable Generation integration is causing changes to grid utilization also.

• UFMP covers 6 rated paths while TOP-007-WECC-1 covers approximately 40 rated paths.

• There have been events in the past where all schedules across a path were curtailed and flow was not changed.

High Level Overview

• Any Transmission element/line/path can be nominated in the tool.

• Transfer Distribution Factors (TDF) will be calculated for all source/sink combinations for each monitored element.

• Curtailments would be based on Transmission Priority and include tagged and untagged uses

Proposed Schedule

• ECCTF plans to bring proposal forward at the March Joint Meetings

• If accepted by Standing Committees, take it to the WECC Board in June.

• Request proposals and negotiate contract in Q3 2012

• Testing in Spring 2013

• Implementation Fall 2013

Questions?