With the surge in the fossil fuel prices and increasing environmental concerns,significant efforts have been
made to propel and develop alternative energy technologies to cope with the energy shortage for island
power grids. Recent advancements and developments on power electronic technologies have enabled the
renewable energy sources to be grid-connected with gradually higher penetration in island electricity supply.
Consequently,the utilization and efficiency of renewable energy resources in islands has received remarkable
attention from both the academia and industry.In this paper, a brief overview on the current status of island
energy resources is described.Then,the existing utilization status and development potential of various
renewable generations for island power grids,including solar,wind, hydropower,biomass,ocean and geo-
thermal energy,are investigated.Furthermore,the advanced technologies to improve the penetration level of
island renewables, including energy storage techniques, hybrid renewable energy system, microgrid,demand
side management,distributed generation and smart grid, are presented.