Historical Role Of Solar Energy One of the more common and more popular roles that the sun, or solar energy, played during those ancient times is that of a force that is able to sustain life based on its ability to give off renewable energy. This is probably the main reason as to why the people during those times, especially in native South and North America, as well as in other parts of the world, worshipped the Sun. Solar radiation, together with secondary solar-powered resources like biomass, wind, wave and hydroelectricity are accountable for majority of the available renewable energy on Earth. Only a small fraction of the available solar energy is utilized. Solar powered electrical generation depends on photovoltaics and heat engines. A solar electric system is less expensive and can give you power for up to 30 years if you maintain it well. Solar power is also a renewable source of energy, which means that it is very clean. Today, it is more important to invest in devices that do not damage the environment and atmosphere. Solar panels do not have any moving parts and will need only minimal maintenance. Solar Energy Power Solar energy or electricity is actually derived from certain solar energy technology and photovoltaic solar technology that allows you to convert solar heat into reusable energy, allowing you to get power and electricity in your home and work place. At this day and age, there are actually over 200,000 homes that use solar energy technology, 10,000 of which are powered solely by solar energy. The sun provides a large amount of energy that artificial units cannot sufficiently give. The small part of the power stems through to the earth in the form of sunlight. The rays that deliver the energy of the sun give both heat and power that can effectively be gathered and changed to other types of energy, such as electricity. Unfortunatley, among the solar energy systems that are in the market, photovoltaic panels are considered to be one of the more expensive ones, if not the most expensive in the solar energy market today. Solar Thermal Systems Solar thermal systems, on the other hand, simply generate heat, and are well-suited for boilers, furnaces and water heaters, as this type of system allows you to make heat using direct solar energy at a much lower cost as compared to using conventional energy and electricity.