Compared with a fossil-fuel plant of the same output, a hydroelectric plant has:

1. A hydroelectric plant uses falling water, which is free and continuously replenished. 2. There is no combustion, so no CO2 or other air pollutants are emitted. 3. Fossil plants must buy fuel and release pollutants. 4. So hydroelectric plants have lower fuel cost and far less air pollution. 5. The main hydro drawback is ecological disruption from large dams. _Source: syllabus Science Ch 14 'Sources of Energy' (byjus.com extract)_