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Published: March 18, 2015

Variable Transfer Limits (VTL) Study Complete - Final Report Posted

In June 2014, ColumbiaGrid began a process to coordinate technical analyses, as performed through a third-party contractor, to calculate the Variable Transfer Limits of the Northwest AC Intertie. The analyses were performed pursuant to the Dynamic Transfer Capability (DTC)Study Methodology and California - Oregon Intertie (COI) Statement of Work which were established through a collaborative effort, led by ColumbiaGrid, among the owners, operators, and purchasers of long-term transmission rights of the California-Oregon Intertie, including members of ColumbiaGrid and Northern Tier Transmission Group, Pacific Northwest Generating Cooperative, and the California Independent System Operator.

In accordance with section 1.1 of the Variable Transfer Limits Functional Agreement, ColumbiaGrid has posted the COI VTL Study Final Report on its website at:


Member: Tacoma Power      Project: ColumbiaGrid     
Tacoma Power

"As a charter member of ColumbiaGrid, Tacoma Power has observed the benefits for its customers of regional transmission planning. Engaging in the ColumbiaGrid collaborative transmission planning process has fostered diverse and innovative solutions. This open process for identifying and resolving transmission challenges has delivered cost-effective reliability to our entire region."
~~ William A. Gaines, Director of Utilities