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Abstract: Since the global warming and climate change are recognized as real concerns, attention of power system planners and operators, energy policy makers and regulators as well as developers around the world including Australia is focused on using alternative and low emission energy technologies for electric power production. Renewable energy and energy efficient technologies have many advantages including reducing climate change, increasing sustainability in power sector, and increasing security of power supply. This paper presents an overview on both current electricity grid and future grid. Experts believe that in future more distributed generation (DG) will be integrated into the low to medium electricity grid. This paper will also review the key drivers in relation to integration of increased DG technologies in general and the renewable energy-distributed generation (RE-DG) technologies in particular, into the electric power system and the opportunities and challenges linked to these technologies. This paper also reviews possible connection location of RE-DG into the grid and its impact on system voltage. [Copyright &y& Elsevier]