And if there's 7.62 gigapersons on earth, that's about 3.2MWh/year per person or 271 kWh/month per person. Since that's the same order of magnitude as, say, a

And if there's 7.62 gigapersons on earth, that's about 3.2MWh/year per person or 271 kWh/month per person. Since that's the same order of magnitude as, say, a US household, that does seem credible.