Given the demonstrated unwillingness of private investors to take on all of the construction risk of gigawatt scale nuclear plants through the CfD model, it is inevitable that a public-private risk sharing model should be contemplated if new gigawatt-scale plants are to be constructed. The Regulated Asset Base (RAB) model— which has been given Royal Assent in the Nuclear Energy (Financing) Act is one such. However, the model entails significant uncertainties and downsides. Chief among these is that although the financing of a plant should be cheaper in headline terms than a model in which the private sector shoulders all construction risk, the extent to which this represents value for money depends on the financial value of the construction risk being absorbed by the public balance sheet. The consumer or taxpayer is taking an unknown and uncertain risk of cost overruns, yet disburses funds from day one without earning a return.