What is the primary purpose of grid-scale energy storage?

• A. To generate electricity.
• B. To store energy for personal devices.
• C. To balance supply and demand on the grid.
• D. To eliminate the need for transmission lines.

Answer: (C)

Grid-scale energy storage stores electricity when generation is high and releases it when demand is high, acting as a buffer for the electricity system. Its main job is to balance supply and demand on the grid, which helps keep the grid stable in real time, smooths out the variability of renewable sources like wind and solar, and supports services such as peak shaving and fast frequency regulation. It’s not about generating electricity, and it’s not primarily for storing energy for personal devices. It also doesn’t eliminate the need for transmission lines—lines are still needed to move energy where it’s produced and where it’s used, though storage can reduce some strain.