Many accidents occur in renewable energy systems. For example, fire accident at Argentinian solar parks central inverters, fire in the turbine at New Roundhouse Industrial Wind Facility West of Cheyenne, the icing on a wind turbine, the collapse of the second blade of MidAmerican wind turbines by a wind gust. This is a review study that requires collecting many reports and technical journals then provides some significant summary that can be useful for Renewable energy investors.