The document provides information about hydro power, including its history, types of hydro power plants, components and working, and case study of Hirakund Dam in India. Some key points: 1) Hydropower harnesses the kinetic energy of flowing water and is considered renewable as water sources are replenished. 2) Types of hydro power plants include run-of-river, reservoir, and classifications based on head of water and load. 3) Hirakund Dam is the longest earthen dam in the world located in India. It displaced over 22,000 families but provides irrigation and nearly 300MW of power.