There are necessary energy needs only biologically, adults run at about 100 watts. So if humans could use electricity as energy source directly (or indirectly

There are necessary energy needs only biologically, adults run at about 100 watts. So if humans could use electricity as energy source directly (or indirectly without losses) instead of biomass diet, 50 MW would supply about 500k people. Electricity for our everyday applications is nice, but its demand is elastic (depends on price) and there is no rule of thumb about consumption per person outside of just measuring what various societies happen to use currently, but that's bad data to plan by as we are hugely overusing and underpricing fossils. Some communities don't use any electricity, etc.