National Renewable Energy Laboratory
July 2018

Executive Summary

The Interconnections Seam Study, released at the TransGrid-X 2030 Symposium at Iowa State University in July 2018, addresses the benefits and costs of expanding electric transmission between the Eastern and Western U.S. power grids. The study analyzed three scenarios of expanding transmission between the two regions, thus making the grid more national and flexible in nature. Extensive participation and input from grid operators and electric utilities helped ensure that the results are realistic and achievable in the real-world. The Midcontinent Independent System Operator, Southwest Power Pool, and Western Area Power Administration were partners on the research team, and more than 20 utilities and grid operators participated on the study’s technical review committee.

ACEG has been actively calling attention to NREL’s seminal analysis. Learn more about the study by reviewing initial findings and associated resources below.