Solar energy is becoming more and more popular as a source of household energy Solar energy is becoming more and more popular as a source of household energy in many countries around the world. Why is this? What the advantages and disavantages of solar energy? With the rapid development in technology of solar energy, the application of this form of power is spreading globally. Countries have been encouraging people to use solar energy for their household needs. There are several advantages of solar energy, which may be the reasons for the widely use of if in household worldwide. The main merit of solar energy is it cause no pollution to the environment. For instance, solar plants absorb energy from the sun and transform the energy into electricity with no wasted water or pollutant in this process. Furthermore, compared with dams and nuclear plants which are both clean energy sources, solar plants are easier to build and money-saving, which encourages governments to invest in them. In addition, ordinary people may use solar energy in a price cheaper than other forms of energy. The sun pours energy to the earth without charging is penny, so the generation of electricity from solar energy is also free. Although merits of the application of solar energy are obvious, drawbacks come with it. While the process of electricity generation is clean, the manufacturing of equipments of solar energy may be harmful to the local environment. For example, electric cars are clean without pouring carbon dioxide into the atmosphere, but the produce of batteries may bring wasted water with deadly heavy metal along with it. Moreover, solar energy is cheap but sometimes unstable. The energy heavily rely on the sun, which may not be able to provide constant power in bad weather. Finally, solar engery systems may create a large amount of cost in maintenance, which leads hesitation about its further application.