I don't think that number is correct. Their source does say "monthly" in a few places (though notably, not next to the actual figures) but I think that's the daily average. Other sources [1] [2] also yield numbers closer to 6.6 kWh/day.

So it won't need 100 m^2 of solar panels per household; it'll only need about 3-4 m^2 of solar, which is also in line with what a residential rooftop installation would look like.