system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we "store" electricity?
gpt
There are various ways to store electricity, they generally take the form of converting it into chemical energy as in a battery or physical energy as in a flywheel.

One of the more popular techniques to save energy for the national power grid is to use it to pump water from a lake to the top of a mountain while the grid requirement is low. When there is high demand the energy company dumps the water back into the lake via a generation plant and feeds that energy back to the grid.