East Asia Energy Storage System Integration

How is electricity supplied in East Asia?

If we assume that half of the electricity demand in East Asia is met through wind energy and roof-mounted PV panels occupying negligible land, while the other half is supplied from PV Global Energy Interconnection Vol. 2 No. 5 Oct. 2019 3 in a closed loop.

Does East Asia have pumped hydro energy?

East Asia has abundant wind, solar, and off-river pumped hydro energy resources. The identified pumped hydro energy storage potential is 100 times more than required to support 100% renewable energy in East Asia.

How much electricity does a solar PV system use in East Asia?

The total electricity consumption in East Asia is 7,300,000 GWh/yr. Assuming an average capacity factor of 18%, solar PV systems with a rated capacity of 4,630 GW are required to meet the entire electricity demand in East Asia. This translates to a combined panel area of 23,000 km² or 14 m² per person assuming a panel efficiency of 20%.

When do we need more energy storage?

Additional storage is needed when the share of solar PV and wind in electricity production rises to 50-100%. Pumped hydro energy storage constitutes 97% of the global capacity of stored power and over 99% of stored energy and is the leading method of energy storage.

What is the storage potential of a PHES system?

(Google Earth image) The storage potential of PHES is proportional to the volume of the upper reservoir, the head, and the round-trip efficiency. For example, a PHES system with twin 2,000,000 m3 reservoirs, a 700 m head, and 80% round-trip efficiency can store 3 GWh of energy and operate at 500 MW of power generation for 6 h.

How does a hydro energy storage system work?

Pumped hydro energy storage (PHES) systems and batteries are by far the leading storage techniques. PHES systems store excess electricity by pumping water uphill to the upper reservoir. By releasing the water through the turbine, the stored energy is recovered.