If the other forms of electricity are cheaper than coal why do they pay more for it?
Because the transition from older to newer forms of electricity production involves manufacturing and installations - which aren't cheap.
A single marine turbine can cost US$10 million,plus it needs to be set up and linked to the grid.
However, as these are non-recurring costs, this is not an issue after the phase-in period.
Really? How long will a marine turbine last?