Present disclosure relates to a DC superconducting liquid hydrogen energy pipeline system with liquid nitrogen cold shields, including a starting station, one or more intermediate stations, and a terminal station connected sequentially through a liquid hydrogen superconducting pipeline with liquid nitrogen cold shields. Liquid hydrogen superconducting energy pipeline with liquid nitrogen cold shields includes liquid hydrogen transmission pipeline, a liquid nitrogen cold shield layer, the external cold insulation layer and the superconducting cable group arranged inside liquid hydrogen transmission pipeline having a liquid nitrogen cold shield in an outer section of the liquid hydrogen transmission pipeline. Present invention can be applied to a large new energy base for DC superconducting transmission of electricity, and excess power can generate hydrogen, and hydrogen generated provides a low-temperature environment for realizing superconductivity after liquefaction. DC superconducting liquid hydrogen energy pipeline system efficiently transmits electricity in large capacity and low loss.

A wide-area power supply system has a small impact on the environment and is highly economical, as a wide-area power supply network that uses hydrogen energy without requiring conventional transmission towers, etc., the wide-area power supply system comprising: a primary power plant; a hydrogen production facility which produces hydrogen by using electricity from the primary power plant; a primary hydrogen storage facility distributed over a wide area; a secondary hydrogen storage facility distributed for each primary hydrogen storage facility; a regional power grid which sends power to power consuming facilities or dwelling units within a residential area; a secondary power generation facility which is installed within the residential area and converts hydrogen transported via the primary hydrogen storage facility or the secondary hydrogen storage facility into electric power; and a transportation means such as a trailer for transporting hydrogen between the hydrogen production facility and the primary hydrogen storage facility, between the primary hydrogen storage facility and the secondary hydrogen storage facility, and between the primary hydrogen storage facility or the secondary hydrogen storage facility and the secondary power generation facility.