Flowing water, also known as hydro power, is a renewable energy resource that has been used by humans for thousands of years. Today, flowing water is typically used to generate electricity through the use of hydroelectric power plants. Hydroelectric power plants work by harnessing the energy of falling water to turn turbines, which in turn spin generators that produce electricity. The water used in hydroelectric power plants is typically stored in a reservoir, which allows for greater control over the amount of water that is used to generate electricity. Hydroelectric power is considered to be a clean and sustainable source of energy, as it does not produce harmful emissions or contribute to climate change. However, it can have environmental impacts on wildlife and ecosystems, and the construction of hydroelectric power plants can be expensive and time-consuming.