According to an article in the Ecologist, DECC is now no longer much more than a shell. It seems that the Treasury and the new Infrastructure commission headed by Lord Adonis are taking all the decisions related to energy projects, leaving Amber Rudd with little to do beyond talking about the weather (or at least the climate) with colleagues from around the world.
Unfortunately Lord Adonis seems to be enthusiastic about wind energy, so the insanity may continue for a while yet. But at least energy policy seems to have been removed from the hands of the deep greens.