Update to STCP14-1 ‘Data exchange of charge setting’ to reflect CUSC Modification CMP306 ‘Align annual connection charge rate of return at CUSC 14.2.21 to price control cost of capital’.

This proposal seeks to align STCP14-1 with CUSC modification CMP306. It requires the Onshore TOs to confirm their respective pre-tax Weighted Average Cost of Capital (WACC), used as the basis of their Rate of Return.  The TO Rate of Return is applied to Transmission Connection Assets as part of the annual charge setting process. This is as well as stating the pre-tax WACC and the calculation methodology in the TO’s respective Statement of the basis of transmission owner charges document.