and not in a fixed number of years,

This is designed to remove distortions that inefficiently favour windy but distant-from-load areas. Complementary reforms on top of this are envisaged (which are sensible regardless). These include introduction of financial transmission right on forecast output-weighted locational marginal prices and/or locational transmission charges, but failing that, efficient location decisions can be supported by adding an annual regionally specific capacity payment per MW into the CfD design itself, as set out in earlier and more complex iterations of the proposed mechanism.