Question

Which type of Energy storage is only large scale storage method in use at present:
1. Mechanical energy storage
2. Storage in compressed gas
3. Kinetic energy storage
4. Potential energy storage in pumped hydro

Answer 1

Correct Answer - Option 4 : Potential energy storage in pumped hydro
Pumped Storage hydroelectric storage:

• A pumped storage power plant stored energy at a large scale by means of water in the upper reservoir.
• It consists of two reservoirs one is an upper reservoir and another is a lower reservoir.
• At times of very high electricity demand on the power system, the water from the upper reservoir, carried downhill by a penstock.
• The Potential energy and kinetic energy developed due to gravity in falling water from the upper reservoir to the lower reservoir is utilized to rotate a turbine to produce electricity.
• When demand is low, electricity is taken from the power system to power a pump that sends water from the lower reservoir back up to the upper reservoir.
• The Synchronous machine used in Pumped storage power plant act as both motors as well a generator.
• A pumped storage power plant is classified under Peak Load Plant.