We employ residual income as performance measure in a regulatory context utilizing the relative replacement cost rule (Rogerson, 2008, 2011). We find, in line with Rogerson (2008, 2011), that overall welfare is maximized if the regulator is aware of the data required to parameterize the model....

In this discussion paper I review and discuss the main economic and technical issues affecting the Regulatory WACC assessment in the sector of regulated utilities. I focus on three main compelling issues (the estimation of the risk-free rate, the treatment of risky debt, the calculation of the...