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 https://www.interconnection.fyi. Berkeley Lab compiled, aggregated, and cleaned interconnection queue data from >50 transmission grid operators (7 ISO/RTOs and 50 non-ISO balancing areas), which collectively represent ~98% of currently installed U.S. electric generating capacity. The dataset includes requests submitted to queues through the end of 2025, and only includes generation requests seeking to connect to the transmission grid (i.e., does not include load interconnection requests nor distribution-connected or behind-the-meter projects).
The Excel data file includes (a) the full project-level interconnection queue dataset through 2025, (b) a codebook (data dictionary) describing each data field, and (c) 36 additional tabs featuring tables summarizing a range of interconnection metrics.
DA - 05/2026 N1 -An interactive visualization of the queue data can be found here, interactive maps here, and duration and outcome trends 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.
N2 -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 https://www.interconnection.fyi. Berkeley Lab compiled, aggregated, and cleaned interconnection queue data from >50 transmission grid operators (7 ISO/RTOs and 50 non-ISO balancing areas), which collectively represent ~98% of currently installed U.S. electric generating capacity. The dataset includes requests submitted to queues through the end of 2025, and only includes generation requests seeking to connect to the transmission grid (i.e., does not include load interconnection requests nor distribution-connected or behind-the-meter projects).
The Excel data file includes (a) the full project-level interconnection queue dataset through 2025, (b) a codebook (data dictionary) describing each data field, and (c) 36 additional tabs featuring tables summarizing a range of interconnection metrics.
PY - 2026 TI - U.S. Interconnection Queue Data Through 2025: Complete Interconnection Request Dataset and Summarized Data Workbook ER -