This yielded normalised costs of EUR 3 per MWh for nuclear, EUR 0.23 per MWh for wind, EUR 0.1 per MWh for hydro, EUR 0.15 per MWh for biomass, and EUR 0.03 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 (2013a and 2013b) and Rabl and Rabl (2013) are about one order of magnitude higher, EUR 1 and 3.8 per MWh, respectively, while Torfs (2001) reports an external cost due to nuclear accidents in the range of EUR 8 lO'4 and 0.35 per MWh.