The invention relates to an island 
energy supply system with cold energy. The island 
energy supply system comprises an LNG 
power generation system unit, a 
renewable energy power generation and 
energy storage unit and a low-temperature multi-effect 
distillation seawater desalination system. The island 
energy supply system is a combination island energy supply system formed by power generation and 
energy storage systems in a combination mode based on an LNG power generator and unstable 
renewable energy such as wind energy, 
solar energy and wave energy. 
System waste heat is used as a heat source for a 
seawater desalination unit. During an 
energy storage process, stored LNG is converted into high-pressure 
natural gas (NG) by cold accumulation gasifying, the NG enters an NG 
storage tank and a 
pipe network system for storage and standby application, then air is subjected to compression, indirect cooling and cold accumulation, cold energy is recycled, and after throttling, liquidation storage is carried out. During a power using process, after high-pressure NG absorbs heat and is heated, the high-pressure NG enters a 
turbine expansion 
machine for working, then the NG enters a small gas 
turbine combustion chamber and burns with 
compressed air to drive a gas 
turbine to work, and 
liquid air is subjected to cold accumulation and gradual heat absorption temperature raising and then enters the turbine expansion 
machine for working. According to the energy supply system, on-island 
electricity energy and 
fresh water can be supplied at the same time, unstable renewable resources are converted into stable controllable generated power to be output, system efficiency is improved, power using cost is lowered, and compared with traditional island energy supply system, the island energy supply system has the great advantages.