1. Renewable: Water energy is a renewable resource, meaning it replenishes naturally. As long as the water cycle continues, hydroelectric power plants can generate electricity. This makes it a sustainable energy source, unlike fossil fuels which are finite.

2. Clean: Hydroelectric power plants don't produce greenhouse gasses or other pollutants during operation. This makes it a much cleaner energy source than fossil fuels, which contribute to climate change and air pollution.

3. Reliable: Hydroelectric power plants are generally very reliable, especially compared to other renewable sources like solar and wind. This is because water flow is more predictable than sunlight or wind.