The application of distributed energy network technology to the introduction of fuel cells in residential areas is described. The energy networks of electricity, heat, and hydrogen enable flexible operation of equipment and contribute to CO₂ emission mitigation, energy saving, and cost reduction.

Two concrete systems for a group of detached houses and an apartment building have been designed and proposed. The system for a group of detached houses reduces 6-8 % of CO₂ emission and 50 % of initial costs. The system for an apartment building provides flexibility on the supply of electricity and heat by combining CHP (Combined Heat and Power) systems which have different heat and electricity generation characteristics.

The demonstration in an apartment building has been started to evaluate the effect quantitatively and acquire know-how for practical application.