ColumbiaGrid Update WECC PPC June 11,

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Biennial Plan Update Approved by the ColumbiaGrid Board of Directors on February 17, 2010

Updated Information on Major Regional Projects

Historical Usage Information Northwest to British Columbia

2010 Transmission System Assessment Assessments are completed each year The 2010 Assessment will be complete in July –Summer and winter conditions –5 and 10 years into the future –Problems identified can be addressed by the transmission owners or through ColumbiaGrid Study Teams Transmission owners are also using the assessment to help demonstrate compliance with NERC Reliability Standards

Northwest Area Coordinator ColumbiaGrid officially began performing this function for the Northwest area on March 5, 2010 –Previously performed by BPA

9 Mid Columbia Area –Transmission expansion plan complete –Working out cost allocation Puget Sound Area –Transmission expansion plan nearing completion –Five projects Wind Integration Study Team –Joint with NTTG –Two Efforts Dynamic scheduling technical limits Remote versus local generation Cross Cascades Area –New study team formed Other Planning Activities

Middle Columbia Area Preferred Plan

Puget Sound Area Preliminary Plan

Cross Cascades Study Team