About GridAlmanac

Data source

Plant records are derived from the U.S. Energy Information Administration's Form EIA-860 (2024 final — the plant and generator inventory, with capacities, operating statuses, and retirement dates) and Form EIA-923 (annual net generation, 2015–2024). Both are public-domain federal datasets. Capacities are nameplate ratings summed over each plant's generators.

Historical coordinates for some retired and Puerto Rico facilities were sourced via the WRI Global Power Plant Database (CC BY 4.0).

How status is classified

A plant is listed as operating if any of its generators is operable, including units held in standby. It is listed as under construction if its only active generators are under construction or in testing, and retired if all of its generators have been retired. EIA's files track generator retirements back to roughly 2002, so retired coverage begins around then. Puerto Rico is covered from 2018 onward.

Methodology

States and counties are taken directly from EIA records — the earlier step that reverse-geocoded coordinates is gone. Each plant's fuel is the category holding the most nameplate capacity among its units. URLs are stable across data refreshes: a plant page keeps its address when the underlying data updates, and any page that must move is redirected permanently.

Accuracy

Figures on this site should be verified against current EIA filings before being relied on for commercial decisions.