Hydropower

[2] Hydropower, water power or water energy, is the conversion of flowing water to energy and is a renewable source since the water cycle is actively rewned by the Sun.

Of the earliest hydropower was via mechanical milling like grinding grains

But modern hydro plants use generators and turbines.

Hydropower holds the largest share of global electricity production

[2] Upsides hydropower is a cheap electricity form despite its building can be costly. It pairs well with other sources as it can use as base source and control flood.