The Zwentendorf Nuclear Power Plant was built in Zwentendorf, Austria. It has never entered service because in a referendum on the 5th of November 1978, a narrow majority of 50.47% voted against the start-up.

The plant was completely finished by the time of the referendum, but has never been used for electricity production. After the referendum, some parts were taken out, but in large the facility is still complete. It has been since used as a training center, a movie and photography shooting scene and location for other events.

In total the project costed €1.4 billion.