That's not the same as your previous statement... Of course usage goes up and down. The problem you previously stated is that power plants are paid to shut down

That's not the same as your previous statement... Of course usage goes up and down. The problem you previously stated is that power plants are paid to shut down, which is not the way it has to be but rather the consequence of the chosen system of production. In any case, that's not the reason of the current "saving sessions" in the UK, as already said.