For example, people can charge their electric cars in the morning with sunlight, and during the night, the electric cars will run saving the morning energy ; therefore, solar energy works for a long time and people can do their work without harming the environment. Additionally, solar energy does not use any equipment to operate, such as wires or cords, unlike other sources like wind energy. For example, solar energy can be installed on the roof of the house without using any equipment and without taking up space. On the other hand, Louwen, Sark, Schropp, Turkenburg, and Faaij (2015) point out that solar cells need to replace the material used or decrease the amount of equipment used like silver and indium since they are used in silicon cells. . This could have a negative impact on the environment and production costs (p. 1407). Overall, solar energy can be used as renewable energy to reduce pollution and protect the environment from harmful gases, and can be used without access to electricity.