Is it possible to have a free market of electricity?

So I was thinking, what if there was a protocol, in which you send electricity to someone, and in that same electricity message you send the address in which you want to receive the payment. The payment is in a token that represents a kilowatt. With that same token you can buy electricity from someone else.

Think of places with spin bikes, in which you can hop on to earn some cash, by generating electricity.

What do you think?