Here [1] is an example for planned transports of 152 CASTOR casks containing around 300,000 fuel element pebbles from Jülich to Ahaus: The lowest estimate (excluding security) is 150 Million Euros.
So electric energy in the past was cheap by using NPPs. The energy companies made massive profits. Now, decades later we have to pay for it and will have to continue to do so for centuries. (As always: privatize profits, socialize the costs)
I would like to take these 150 Million and buy some batteries...
[1] Sorry, german language: https://www.zeit.de/politik/deutschland/2026-03/radioaktiver...