The Western Electricity Coordinating Council (WECC) 10-Year Regional Transmission Plan (Plan) is a Western Interconnection-wide perspective. The Plan provides information on an expected future transmission and generation in the Western Interconnection, what transmission capacity may be needed under a variety of futures, and other insights.

The objective of the Plan is to provide information to support decision-makers in determining where and when to build new transmission, or to take other related actions to help ensure the Western Interconnection is reliable, low-cost, efficient, and environmentally sound.

The WECC 10-Year Regional Transmission Plan and its associated documents were approved by the WECC Board of Directors on September 22, 2011.