Hydroelectric power is the converting of energy coming from running water to produce electricity. Hydroelectricity is a similar term that refers to the electricity that is produced from this process.
Hydroelectric power is power harnessed from converting the energy coming from running water. The mechanical energy is transferred from a rotating turbine to a generator, which produces energy. Hydropower is a shorthand term that can be used in place of hydroelectric power, both mechanical and electric.
Hydropower has been used since ancient times for numerous applications, including for the operation of domestic lifts, cranes, windmills and irrigation systems. In the early 20th century, the term began to be used for hydroelectric power.