> a "sip" of orange juice is indeed a lot of energy, about 80 kJ [1], and if you could extract that much energy from one person every 10 seconds you'd get 8 kW

> a "sip" of orange juice is indeed a lot of energy, about 80 kJ [1], and if you could extract that much energy from one person every 10 seconds you'd get 8 kW, which could power a decent sized lobby if the lighting is efficient. What's the total energy expended to produce those 80 kJ worth of orange juice, though? You need to power agricultural machines, food trucks, etc. etc.