Good question. The core of the system is the separation of the fecal solids from the water contained in the feces. That's apparently done by heating the wet, raw fecal matter to the point where the water boils off, something that takes a lot of heat. Apparently, that heat eventually comes from burning the dried fecal matter at high temperatures. What's used to start the fire and does burning the dried fecal matter provide enough heat to offset the cost of the starter fuel? This could be an excellent idea, but it requires more explanation.
The answer is “NO”, it is not some closed loop efficiency system. BTU’s in does not equal BTU’s out to generate electricity. It may be a very business smart way to run a sewage treatment plant and co-generation for electricity, but it is still a gas fired system.