Comprehensive Data Visualization on the World’s Nuclear Power Reactors 1951–2026

WNISR, 14 April 2026

The WNISR-Team is proud to present the new interactive data-visualization tool—the WNISR-DataViz—covering 828 power reactors (as of 7 April 2026) that in a couple of clicks delivers the answers to these questions and countless other research interrogations. The tool provides numbers and background information on reactor fleets, power ratings, age, construction activities, technology providers, and operational status. Multiple search categories allow for cross-filtering to drill down to the precise piece of information you are looking for. Try it out!

The first WNISR-DataViz edition was initially hosted by the prestigious Bulletin of the Atomic Scientists between 2017 and 2020 with seed-funding support from the Pulitzer Center on Crisis Reporting. In April 2021, it was implemented on WNISR’s website and data has been continuously updated since. However, it became obvious over time that scope and format became increasingly outdated. The original DataViz had a strong basic approach to the monitoring of construction data. In parallel, the scope of the annual report had significantly widened, and the volume had more than doubled from some 270 pages to almost 600 pages.

Technically, the past decade has also seen a significant jump providing many opportunities for enhanced functionalities and vastly improve ergonomics.

The team started in late 2023 to develop a new concept. Eric Mauvière, statistician and educator with icem7, carried out in-depth interviews with users and helped putting together a framework of functionalities and ergonomic goals. Arnaud Martin, web designer and full-stack developer, and Diala Ashkar, graphic designer and art director, both with 23Forward, were instrumental for the significant upgrades in ergonomics, design, and web-implant. Visioncarto’s Philippe Rivière, veteran programmer and journalist, already key for the development of the original DataViz edition made sure that all those great ideas were actually technically translated into a workable tool. Finally, WNISR data engineer Julie Hazemann, organized numbers and contextual information so it could be handled by the new tool.