Efforts on reducing the capital costs of nuclear power, through incremental improvements at the industrial level, as well as through innovation through new research and development, are thus an indispensable part of credible strategies to decarbonise the power sector. This chapter has reviewed the discussion of this relationship in the various editions of the report. It is beyond the scope of the present study to determine the “correct” discount factor. The relationship of the discount factor to concerns regarding “sustainability” must however be discussed elsewhere and, ideally, before the next edition of Projected Costs.