All Programs > Planning and Expansion
Planning and Expansion

Planning and Expansion Projects

Biennial Transmission Plan

ColumbiaGrid’s planning and expansion agreement calls for preparation of a biennial transmission plan based on the principle of single-utility planning. The plan addresses a 10-year planning horizon and is intended to identify and resolve the projected needs of parties to the agreement so they can meet long-term firm transmission obligations. ColumbiaGrid prepares the 10-year plan in an open and transparent planning process designed to promote consensus among affected entities, including where projected needs affect more than one transmission system.

ColumbiaGrid began preparing its first biennial plan in mid-2007. One of the first steps was to gather information on transmission plans from ColumbiaGrid planning parties and from others. We have compiled a list of projects that will help provide the basis for developing a system assessment study and eventually, ColumbiaGrid’s first biennial plan.


Enter Project >>

Joint Requested Service Request Coordination

The Transmission Planning staff provides support for the OASIS program in developing and implementing common queueing on the ColumbiaGrid OASIS for requests made for transmission and interconnection service.
Enter Project >>

WECC Base-Case Data Submittals

ColumbiaGrid will develop data submittals on behalf of each participant for WECC base-case development purposes.
Enter Project >>

Regional Planning Coordination


Enter Project >>

Projects Area Map

Area map of all on-going and future projects within the ColumbiaGrid System
Enter Project >>

Attachment K


Enter Project >>