Co-Location Policy Map

Along the nearly 49,000 miles of the U.S. Interstate Highway System, rights-of-way have already been permitted. This makes these rights-of-way an ideal location to co-locate electric transmission infrastructure, a key solution to quickly building out the grid in response to fast-growing demand for electricity. However, most U.S. states still prohibit or restrict longitudinal co-location of high-voltage power lines along interstate highways, limitations based on outdated regulations. The map below shows where states have lifted these prohibitions and where barriers, either in statute or in practice, remain. (For more about co-location policy across the United States, read our related Insights post.)