1 kWh - one kilowatt hour-Electricity is often expressed in kilo-watt hours. 1 kWh is 1000 watts used in one hour

1 GWh - One Giga watt hour is one million kWh

1 TWh - One Terra Watt hour is one billion kWh, also the approximate annual amount of electricity consumed by 45,000 households

Dam - Construction to hold back waterin a water course

Reservoir - A ”lake” or mass of water collected behind one or several dams

Waterway - Pipeline or tunnel leading water from a reservoir in the direction of a power plant or all the way to its dispersion chamber

Dispersion chamber - The point or chamber where the water is divided into pressure shafts

Pressure shaft - Steep shaft or pipe leading down to the turbines in a power plant. The height provides pressure and gives the water the kinetic energy needed to rotate the turbine.

Turbine  - Runner with rotor vanes that converts the kinetic energy from water to mechanical energy

Generator - The generator is mounted on the same axle as the runner. As the runner makes it spin, the generator converts the mechanical energy to electrical energy

Aggregate - The generator and its turbine as a unit, or assembly.