Energy Storage Systems

What is the principle behind pumped hydroelectric energy storage?

• Pump water to a higher reservoir and then release the water to generate electricity.

• Pump electrically heated water to the central heating.

• Charge water to the electrified state and then discharge to generate electricity.

• Produce hydrogen using water electrolysis and pump it into the storage tank.

What was the most popular grid-scale ESS in the 20th century?

• Thermal energy storage

• Pumped hydropower storage

• Li-ion batteries

• Hydrogen storage systems

What technology has the lowest self-discharge rate?

• Li-ion batteries ESS

• Redox flow ESS

• Solid-mass block gravity ESS

• Hydrogen ESS

Hydrogen, produced by electrolysis powered by heat and electricity from nuclear power

• Blue hydrogen

• Green hydrogen

• Brown hydrogen

• Pink hydrogen

What solution has the highest round-trip efficiency?

• Gravity energy storage

• Pumped hydro storage

• Li-ion batteries

• Hydrogen energy storage

• Thermal energy storage

What is the power and capacity of Tesla's most famous lithium-ion battery storage from South Australia?

• 150 MW/200 MWh

• 200 MW/400 MWh

• 20 MW/50 MWh

• 500 MW/2000 MWh

What solution has the fastest reaction time?

• Redox flow

• Compressed air

• Hydrogen

• Supercapacitors

How does redox flow technology differ from traditional battery systems?

• Redox flow technology relies on a single tank for both positive and negative electrodes, limiting its energy storage capacity.

• Redox flow technology uses solid electrolytes in separate tanks, allowing for scalable energy storage.

• Redox flow technology does not use any electrolytes, making it as efficient as traditional battery systems.

• Redox flow technology uses liquid electrolytes in separate tanks, allowing for scalable energy storage.

What grid-scale ESS technology has the largest aggregate capacity in the world by now?

• Pumped hydro storages

• Li-ion batteries

• Hydrogen storages

• Supercapacitors

What does ESS not provide?

• Frequency control

• Demand/Supply balancing

• Reserved energy for critical consumers

• Power flow regulation simplification

• Efficient natural resources usage