SNR-300
Kalkar, Germany
The SNR-300 was a fast breeder sodium-cooled nuclear reactor built near the town of Kalkar, North Rhine-Westphalia, Germany. The reactor was completed but never taken online. SNR-300 was to output 327 megawatts. The project cost about 7 billion Deutsche Mark (about €3.5 billion or over $4 billion). Due to safety and political concerns, the project was abandoned in 1991. The high costs of construction and required prospective maintenance rendered its continued operation unviable from an economic point of view. The site is now the location of a theme park, Wunderland Kalkar, which incorporates much of the power plant buildings into the scenery.
Power station data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).