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So-called negative electricity prices usually show up in wholesale power markets, when a big electricity user like a factory or a water treatment plant is paid to consume more power.

She continued: “The masculine and feminine elements, exactly equal and balancing each other, are as essential to the maintenance of the equilibrium of the universe as positive and negative electricity, the centripetal and centrifugal forces, the laws of attraction which bind together all we know of this planet whereon we dwell and of the system in which we revolve.”

So instead of predicting peak demand then building power stations to meet it, energy managers will be able to trade in Negawatts - negative electricity.

The attraction between the positive and negative electricity was supposed to keep the electrons in their orbits in the same way that the gravitational attraction between the sun and the planets keeps the planets in their orbits.

Modern two-prong electrical plugs have one prong that is larger than the other so that it receives positive electricity from one side and negative electricity on the other.