> On–off keying (OOK) denotes the simplest form of amplitude-shift keying (ASK) modulation that represents digital data as the presence or absence of a carrier wave.
https://en.m.wikipedia.org/wiki/On%E2%80%93off_keying
Idk how you define modulation. Note that on/off isn't a worldwide switch, but only one for tiny units with respect to the whole energy grid
The page you googled has nothing to do with how the power grid operates.
> On–off keying (OOK) denotes the simplest form of amplitude-shift keying (ASK) modulation that represents digital data as the presence or absence of a carrier wave.
https://en.m.wikipedia.org/wiki/On%E2%80%93off_keying
Idk how you define modulation. Note that on/off isn't a worldwide switch, but only one for tiny units with respect to the whole energy grid