When people talk about modern digital electrical grids, they usually imply that an inordinate amount of money, something like $3 or $4 billion is at stake and that no-one has much of an idea of how to go about such an upgrade, nor has the appetite for it. So when companies like Scotland’s Faraday Grid emerge, suggesting it had all the answers, it is only reasonable to get all excited and think there is something of a breakthrough going on. Which is all the more reason to be a little disquieted about its seeming collapse this week into the hands of administrators. There was some considerable secrecy about just how the Faraday Exchanger worked, and even more about how this…