3 ms·

Economy 7 in the UK switches meters based on time of day: https://en.wikipedia.org/wiki/Economy_7 https://en.wikipedia.org/wiki/Economy_7

• fy20 4y ago
  ...which is triggered by a radio signal.
  • tom_ 4y ago
    Indeed! More secure that way than trying to do it locally, probably, and now BST is somebody else's problem. But since it's been around since the late 70s, clearly you can do this without needing too much advanced tech - which is what I interpreted as being the perceived problem. (Perhaps incorrectly, but it looks like I wasn't the only one...)