In islands,lack of fuel supply and environmental pollution
issues oblige people to develop and exploit local alternative
renewables for the sustainable electricity supply,and most islands
are blessed with abundant renewable energy resources. So far,
various renewable energy sources have been utilized for electricity
generation in island power grids. While hydropower,wind energy,
and solar power are the main contributor to island energy con-
sumption,only a few is lands make use of modern biomass,geo-
thermal and ocean energy for electricity generation. In addition,
the renewable energy installations among islands are different.
Some islands have achieved the goal that 100% of electricityis
generated from renewable energy,while in most of islands only a
small proportion with lessthan10% of total energy is produced
from renewable energy.The most obvious obstacle of renewable
energy utilization is the variability and random ness of weather-
dependent renewables,and a series of effective measures have
been employed, including energy storage,microgrid,hybrid
renewable energy system,demand side management,distributed
generation and smartgrid,to further enhance the utilization of
renewable energy.With the advent of advanced communication
and information in frastructures in thefutures martgrids,the
utilization of grid-connected renewable energy sources will have a
promising prospect to improve the efficiency,economics, relia-bility,and energy conservation in island energy systems.