this yielded normalised costs of eur per mwh for nuclear eur per mwh for wind eur per mwh for hydro eur per mwh for biomass and eur per mwh for solar again the very different scope of these studies their different methodologies for assessing the expected accidents frequency and the different cost categories included make a comparison among them very challenging estimates of leveque a and b and rabl and rabl are about one order of magnitude higher eur and per mwh respectively while torfs reports an external cost due to nuclear accidents in the range of eur lo and per mwh