The invention relates to a hybrid hydrogen thermo-electric multi-function industrial scale power plant, a system including such a power plant and connected appliances, a convection oven, and a hot and cold thermal fluid supply method. The invention uses a thermal fluid for heating, a thermal fluid for cooling, heat to both heat and cool the respective thermal fluids, a renewable or waste energy source to generate electricity, and hydrogen to store energy for both heating, cooling, and electricity. Ultimately, the invention allows to work off the grid on an industrial scale thereby having minimal environmental impact.