Unit C, the last boiling water reactor in Germany, was shut down on New Year's Eve 2021, as part of the German nuclear phase out.

[1] However, Gundremmingen unit C as well as the other two German nuclear reactors shut down that day (Brokdorf and Grohnde) remained capable of restarting operations in March 2022.

[5] Following objections by the city of Nuremberg to the original planned location on the Danube at Bertoldsheim (between Donauwörth und Neuburg an der Donau), because of protected areas for the city's drinking water supply in the Lech estuary, the plant was instead located approximately 50 km up-river in Gundremmingen, between Dillingen an der Donau and Günzburg.

[6] In 1975 an incident occurred in which two workers were killed by escaping steam: it was the first fatal accident in a nuclear power plant in Germany.

Within ten minutes, there was approximately 3 meters of standing water in the reactor building and the temperature had risen to nearly 80 degrees Celsius.

Pressure relief valves released between 200 and 400 cubic meters (sources vary) of radioactive coolant water into the building.

The contaminated steel parts were contained in protective castings and removed to the interim radioactive storage location in Mitterteich.

[10] Dismantling was "far advanced" in 2005[11] and has led to valuable experience and the development of state of the art processes for the breakdown, handling, and cleansing of radiation-contaminated materials.

[10] According to the operators, approximately 10,000 tonnes of scrap have been created in the process, of which 86% have been re-usable and 14% are to be disposed of in permanent storage as radioactive waste.

[12] In January 2006 the Bayerische Staatsministerium für Umwelt, Gesundheit und Verbraucherschutz (Bavarian State Ministry for Environment, Health, and Consumer Safety) gave permission for the construction of a "technology center" within the confines of the former Unit A - with the exception of the reactor building.

At the end of 1994, the operators announced agreements with the nuclear reprocessing plants at La Hague, France and Sellafield, England, and with that opted for long-term interim storage.

And at least once every operating period and upon every alteration to the fuel load in the core, a report on the so-called shut-down reactivity must be submitted, as required by German safety rule KTA 3104.

[1][18][19] Since August 2004, an interim storage facility has been established on the grounds of the nuclear power plant for spent fuel elements with a heavy metal weight of 2,250 tonnes.

After interior fitting with electrical, heating, and ventilation equipment, installation of heavyweight hoists, and remaining exterior work, on 25 August 2006 the interim storage facility was opened and the first containers from the power plant moved in.

[21] In addition to concern about catastrophic accidents in particular terrorist attacks, the opposition was motivated by fear that the interim storage facility might develop into an unplanned permanent storage facility, since even in 2005, despite many assurances, there still existed no permanent depository anywhere in the world for spent nuclear fuel, which requires safe containment for thousands of years.