What is the efficiency rate of a fuel cell that is powering a city of 50,000 people.?

Question

if you dont know just give me a link that would know.

Answer 1

You're talking about a power plant of roughly 50 megawatts capacity, far more than any companies have been talking about and installing so far. The ref. below describes a 1 megawatt demonstration project using methane from a waste-water treatment plant as fuel. They mention potential efficiency of 60%, compared to 40% for combustion-based power plants.