Technology
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I mean maybe, it's just a back of napkin calculation i didnt spend more than a 5s search, think of it as a lower bound I guess. I don't think my conclusion really changes if it's 40% vs 20%, point is that it's more than enough to power peak usage. I tried digging a bit more but couldn't find anything that contradicted or confirmed it. Here in Canada 1MWh per month is typical for an electrified house (ie electric heating, cooling and stovetop), but our houses are big, our electricity generally cheap and our climate different.
Wikipedia lists avg consumption per capita for China as 5MWh/person/yr, half that of the US, Canada and Australia but that doesn't take into account household size which imagine is higher in china. Also worth noting China has been adopting evs relatively quick and they generally take a huge amount of power.