When radioactive particles from the Chernobyl disaster landed in Germany's Black Forest one woman decided to change her country's relationship with nuclear energy forever.

Julian Rush meets Ursula Sladek, founder of EWS Energy and prime mover in Germany's abandonment of nuclear energy.

Following the story from the first detection of radioactive particles, through the persistent impact of radioactive caesium in the soil to the rapid development of renewable energy after the Fukushima disaster of 2011, Julian tells the story of the transformation that's known in Germany as the Energiewende. With Ursula's son, Sebastian he discusses the future for renewable energy in a nuclear-free nation and considers the influence Germany may have on the rest of Europe.

Produced by Alasdair Cross and Melanie Brown.