The Office of Electricity Delivery and Energy Reliability has released the 2015 National Electric Transmission Congestion Study. Section 1221(a) of the Energy Policy Act of 2005, codified at 16 U.S.C. 824p(a), directs the Secretary of Energy to conduct an electric transmission congestion study every three years, and to prepare it in consultation with affected states and regional reliability organizations.
The Study seeks to provide information about transmission congestion by focusing on specific indications of transmission constraints and congestion and their consequences. It focuses primarily on historical trends over the past few years, and looks into the future to the extent possible.
The 2015 National Electric Transmission Congestion Study can be downloaded here.