U.S. Interconnection Queue Data Through 2024: Complete Interconnection Request Dataset and Summarized Data Workbook

Electric transmission system operators (ISOs, RTOs, or utilities) require proposed power plants seeking to connect to the transmission grid to undergo a series of impact studies before they can be built. This process establishes what new transmission equipment or upgrades may be needed before a project can connect to the system and assigns the costs of that equipment. The lists of projects in this process are known as “interconnection queues”. 

In collaboration with interconnection.fyi, Berkeley Lab compiled, aggregated, and cleaned interconnection queue data from >50 transmission grid operators (7 ISO/RTOs and 49 non-ISO balancing areas), which collectively represent ~97% of currently installed U.S. electric generating capacity. The dataset includes requests submitted to queues through the end of 2024, and only includes requests seeking to connect to the transmission grid (not distribution-connected or behind-the-meter projects).

The Excel data file includes (a) the full project-level interconnection queue dataset through 2024, (b) a codebook (data dictionary) describing each data field, and (c) 35 additional tabs featuring tables summarizing a range of interconnection metrics.

An interactive visualization of the queue data can be found here and interactive maps here. The most recent edition of the “Queued Up” report analyzing U.S. interconnection queues is always available at: https://emp.lbl.gov/queues.

A webinar discussing a prior edition of the “Queued Up” report (from April 23, 2024) can be viewed here.