Our fuel cell CHP inhouse5000+ has a high efficiency of approx. 90% thanks to the use of electricity and heat. Only about 10% of the energy cannot be used.
In a modern coal or gas power plant, which usually does not use both, around 60 to 40% of the energy is lost. Added to this are the losses for the transmission of electrical energy from the power plant to your home.
So, a fuel cell CHP is very efficient.