# User:RichardF/Outline of energy storage

Energy storage is the storing of some form of energy that can be drawn upon at a later time to perform some useful operation.

The following outline is provided as an overview of and topical guide to energy storage:

## History of energy storage

Main article: History of energy storage

## General energy storage concepts

1. Using a high density magnetic field. Energy $E$ in terms of magnetic field strength $B$ is

$E = \frac{1}{2}B^2 = \frac{1}{2}Li^2$

where $L$ is the inductance of the electromagnet and $i$ is the current.