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).

Interconnection queue data

The forward-looking queue pages are built from the Lawrence Berkeley National Laboratory “Queued Up” project-level dataset (Rand et al., LBNL, 2026 edition — data through December 31, 2025). An interconnection request is a developer's application to connect a proposed generation or storage project to the grid; it is a proposal, not a commitment to build.

Queue totals must never be read as a build forecast. Of the capacity requested between 2000 and 2020 — old enough for the outcome to be settled — only about 13% reached commercial operation while roughly 75% withdrew. Every queue page carries this framing.

Requested-capacity figures on this site count each request's primary component (LBNL mw_1). LBNL's headline figure of 2,061 GW (end of 2025) additionally counts the storage component of hybrid projects; the two are never mixed here.

Where a queue request has reached commercial operation, we conservatively match it to an operating-plant record by state, fuel type, capacity, county, and name (782 matches in all), then surface the result as a “time in queue” figure on the matched plant pages. Between annual LBNL editions, project statuses in the seven ISO/RTO regions are refreshed monthly from the ISOs' public queue reports (via the open-source gridstatus library), while the non-ISO West and Southeast regions carry the LBNL edition (latest monthly refresh: July 2026).

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.

Owner pages group plants by the utility or operator reported to EIA; pages exist for owners with three or more plants or at least 750 MW. The reported operator is not always the equity owner of a facility, and large parent companies may appear under several operating subsidiaries.

Data licensing

The underlying federal datasets (EIA Forms 860 and 923) are public domain, and the LBNL “Queued Up” dataset is publicly available with citation. GridAlmanac's compilation — the page content, derived fields such as plant status classification and time-in-queue matching, and this site's presentation — is © Photizo Labs LLC. You are welcome to cite figures from this site with attribution and a link. For bulk reuse, republication, or data feeds, contact us.

Accuracy

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

Who runs this

GridAlmanac is built and maintained by Photizo Labs LLC (Knoxville, TN), led by an applied mathematician and energy-sector consultant.

Corrections and data questions are welcome at [enable JavaScript to view]. More about the studio at photizolabs.com.