Energy hub concept. / Excess power to hydrogen. / Hydrogen storage technology. / Net present cost minimization. / Solar energy system. / Carbon dioxide. / Cost effectiveness. / Costs. / Electric batteries. / Electric energy storage. / Energy resources. / Fossil fuel deposits. / Fossil fuels. / Hydrogen. / Radiation effects. / Solar energy. / Solar power generation. / Energy hubs. / Energy storage technologies. / Environmental pollutions. / Hydrogen storage technologies. / Net present cost. / Power generation systems. / Solar energy systems. / Solar radiation intensity. / Hydrogen storage. / Carbon dioxide. / Carbon emission. / Household energy. / Photovoltaic system. / Power generation. / Solar power. / Solar radiation.