Voluntary Frequency Response (VFR)

A request for comments, before I write any code: one rule to make a home battery a good grid citizen

Five weeks ago I wrote about the evening Britain's grid ran out of margin — the forty-eight minutes on 23 June when frequency sat below 49.8 Hz, bottoming out at 49.657 just after eight, while NESO halted exports to the Netherlands and phoned Paris. I watched most of it unfold from the sofa, which is the correct place to watch a grid event from. What I …