It should work any place that has an AC power grid with accurate records being kept by someone. Isolated off-grid settlements running their own generation would

It should work any place that has an AC power grid with accurate records being kept by someone. Isolated off-grid settlements running their own generation would probably not have that. Isolated off-grid solar, ditto. The UK is all one grid, Ireland (the island) is another, there's a Nordic grid, a Baltic grid, and one for the whole rest of continental Europe (plus Morocco and Tunisia). The US has two plus a separate one for Texas, Canada uses the same two plus a separate one for Quebec (the jokes just make themselves), and Japan weirdly is cut in half, with a 60Hz grid in the south and a 50Hz grid in the north. https://en.m.wikipedia.org/wiki/Wide_area_synchronous_grid https://en.m.wikipedia.org/wiki/Wide_area_synchronous_grid