  There is growing interest in renewable energy around the world. Since most
renewable sources are intermittent in nature, it is a challenging task to
integrate renewable energy resources into the power grid infrastructure. In
this grid integration, communication systems are crucial technologies, which
enable the accommodation of distributed renewable energy generation and play
extremely important role in monitoring, operating, and protecting both
renewable energy generators and power systems. In this paper, we review some
communication technologies available for grid integration of renewable energy
resources. Then, we present the communication systems used in a real renewable
energy project, Bear Mountain Wind Farm (BMW) in British Columbia, Canada. In
addition, we present the communication systems used in Photovoltaic Power
Systems (PPS). Finally, we outline some research challenges and possible
solutions about the communication systems for grid integration of renewable
energy resources.
