Hydroelectric energy is a type of renewable energy and has a very ancient history. The world's first hydroelectric power plant exists and began operating on September 30, 1882 on the Fox River in Appleton, Wisconsin. Approximately 20% of the electricity generated in the world comes from hydropower and holds the largest share of global electricity production. Hydropower basically converts natural forces like water flowing in rivers or waterfalls into electricity. It is clean and sustainable for future energy use. Hydroelectric power plants are usually built on a dam because the dam can store much of the water and can rebuild the downstream environment. Furthermore, the dam can control the flow of water and prevent flooding downstream of the dam. According to the Energy Research Institute, in 2015, renewable energy accounted for approximately 9.9% of all energy consumed in the United States of America. But of this 9.9% renewable energy, hydropower took up about 25%, which in the largest and most popular renewable energy source in the United States in 2015. The reason why hydropower has become One of the most popular renewable energy sources is that the process that converts natural forces into electricity does not require sources that can cause environmental pollution such as oil, coal and natural gas. This means that the hydroelectric power plant does not create any pollution components such as carbon dioxide or nitrogen dioxide in the environment. This may not seem like a significant change, but the fewer pollutants produced can correspond to huge changes in the environment. Then, conventional hydroelectric technology accounts for about 90% and is highly efficient. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay According to the United States Department of Energy, hydroelectric power is the fourth cheapest source of energy. Although the cost of building a hydroelectric power plant is high, it has a low operating cost and a long lifespan. The hydropower plant can be operated automatically in people-free conditions. To build a hydroelectric power plant, the height of the water in the dam determines the potential power needed to generate electricity. The taller the dam, the more potential energy contained in the water. The higher water position allows the water to move down effortlessly. In the structure of a hydroelectric power plant, water flows through the gate and flows through the penstock controlled by the gates. The flow of water through the penstock will control the total amount of electricity generated at the hydroelectric power plant. The potential and kinetics of the water will be converted into rotational motion as the water pushes the turbine blades. When the shaft is rotated, the coil inside the generator will also rotate and produce electricity as the rotation of the shaft inside the generator will produce a magnetic field which, using the induction of the electromagnetic field, will be converted into electricity. According to the 4247-1 standard, it can generally be defined as two main points which are additional provisions relating to drainage and precaution for underground power plant and provisions to meet emergency conditions for drainage. In the 5496 standard, some changes have been added to the 5496 standard, that is, the recommended width of each pipe is 1000 mm, and the recommended depth of the Kaplan & Francis turbine has been increased. In conclusion, although many hydroelectric power plants are built around the world, many of them are.