It was discovered that with the help of units made of slices of potato quarters located between the copper cathode and a zinc anode connected with wire can light your room with LED lights for around 2 months. This was discovered by HaimRabinovitch who is professor of science and agriculture.

This is really amazing discovery and it can be really helpful for people in underdeveloped parts of the world, which means that this has numerous opportunities.

They picked up to try this with potatoes because of two really interesting reasons and those are:

The first reason is that potatoes can grow almost anywhere (even tropical and subtropical climate).
The second reason is that because of the fact that potatoes can grow almost anywhere, the world became abundant in potatoes.

This means that they did not picked up doing this with potatoes because it is source of energy. No potato itself is not the source of energy but it is the ‘bridge’ between all the metal and that way it helps the electrons to move though the wire and that way it gives the electricity.

Source: http://tophealthyhints.com/2016/03/22/did-you-know-that-using-a-potato-you-can-light-a-room-for-a-month-video/