Renewable energy or green power comes from natural sources that are not significantly depleted by their use, such as wind, sunlight, moving water, and plants. In contrast, fossil fuels are considered nonrenewable because their supply is limited, and they take millions of years to form. Besides, the burning of fossil fuels for the generation of electric energy raises environmental concerns such as pollution, soil and water contamination, and the greenhouse effect that can cause climate change by raising temperatures. Nuclear energy also raises environmental concerns like radioactive waste, but it is considered a low CO2 source. Renewable energy for electric power generation has a higher initial cost but has lower fuel costs and environmental costs. Because sites for most renewable energy resources are site-specific, problems with exploiting these resources often lie with their location and limitations on their scale. Solar photovoltaic and wind power are not always available at the time when the energy is needed. Solar power can be stored in thermal storage systems, but it is difficult and expensive to convert it back for power generation. Wind power production can be moved to where the electric energy is being used, and source-dependent variations can be managed and mitigated to some extent. Connecting different sources located very far apart is believed to mitigate these variations. Providing a transmission system with the capacity to transfer power between areas with different renewable sources will also facilitate the interconnection of the grid. Integration of this energy provides benefits to electric power customers and society as a whole. It has the potential to reduce electric costs for all customers by reducing the harmful effects of energy resource crises and fuel emission costs of future power plants. Furthermore, increasing demand for renewable energy would provide new markets for advancing new technology and expand opportunities for new businesses, accelerating job growth and business development.