When we talk about energy storage, what usually comes to mind is battery system. But there are various ways by which energy can be stored aside from battery:
1. Heat storage via salt, sand
2. Storage via kinetic energy and gravity
3. Hydraulic system as in Caliraya: When there is excess power, a pump is driven bring water up to the lake dam, and when power is scarce, the water is released to generate power. With all the power generated, how do you balance this vs. demand
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