<p>Renewable energy, such as solar energy, wind energy, and hydraulic energy, mostly belongs to process energy, which is hard to store, while fossil energy belongs to energy-carrier energy, which can achieve long-term storage. Current conversion and utilization technologies for all types of energy mainly focus on power generation. Fossil energy is convenient to store, but its conversion and utilization technologies mainly rely on the combustion of fossil fuels for power and thermal energy generation, emitting huge amounts of pollutants and CO₂. Power and thermal energy are still process energy which is hard to be stored, and the problem of the low-cost, efficient and long-term storage of energy is difficult to solve, which is the fundamental deficiencies of the current energy production and supply system. H₂ as an energy-carrier energy enables both clean and efficient use and storage. Therefore, the development of efficient, low-cost, large-scale green H₂/power generation is imperative. It is recommended that: (1) new renewable energy units be developed based on integrating H₂, thermal energy and power energy poly-generation technology on demand. The already built “sole power generation” renewable energy units should be transformed into H₂, thermal energy and power energy poly-generation model, to build a comprehensive energy multi-link supply system that achieves energy storage, transportation and utilization, as well as the full-time, high-efficiency, low-cost conversion and utilization of renewable energy. (2) Developing low-carbon and clean technologies for green H₂ and power from carbon-based energy sources, achieving efficient energy conversion and full utilization of resources. (3) Building a new industry for high-value conversion and high-quality utilization of fossil fuels to produce the high-value chemical products instead of pollutants which also provides the best solution for large-capacity and long-term energy storage.</p>