  In this article we shall discuss the development of electrical storage
system. Since the early days of electricity people have tried various methods
to store electricity. One of the earliest device was a simple electrostatic
capacitor that could store less than a micro Joule of energy. The battery has
been the most popular in storing electricity as it has a higher energy density.
We will discuss the development of batteries and their working principle.
Although capacitors has never been thought of as a practical device for
electricity storage, in the recent years there has been tremendous progress in
building capacitors with huge capacitance and it may soon be possible to use it
as storage device. We shall discuss the technological breakthroug in
supercapacitor as a storage device.
