If a solar eruption is ever going to affect earth’s power grid, the satellites will be affected first. See the spacecraft hazards charts below:
The 6 charts above are simple. Green is good. Yellow is approaching charging levels. Red is satellite charging hazard. If you see lots of Red here and a KP of 9 following a large solar flare or other solar eruption (and then your internet and power go down) there is a chance the sun has taken it away.