The universe could have mountain-sized black holes that could provide enough power to run the entire world’s electricity supply, Professor Hawking has claimed.

A huge black hole might be impossible to detect — and despite the fact that they almost certainly exist, the fact that humanity hasn’t been able to observe one has been credited with keeping Professor Hawking from winning a Nobel prize. But a much smaller one, the size of a mountain, would be spewing out rays that could be harnessed and power the Earth.

“A mountain-sized black hole would give off X-rays and gamma rays, at a rate of about 10 million megawatts, enough to power the world`s electricity supply,” Professor Hawking said during the second of his Reith Lectures.

But actually getting hold of that energy would be difficult without unleashing the power of the black hole on ourselves, he warned.

“It wouldn`t be easy however, to harness a mini black hole. You couldn`t keep it in a power station, because it would drop through the floor and end up at the centre of the Earth.”

Instead, we would have to hold it at a safe enough distance to stay secure, but close enough that we could get hold of all of the energy it was letting out.

“If we had such a black hole, about the only way to keep hold of it would be to have it in orbit around the Earth.

“People have searched for mini black holes of this mass, but have so far not found any. This is a pity, because if they had I would have got a Nobel Prize.”

But even if we don’t find one in space, that might not be the end of the plan to harness their power.

“Another possibility, however, is that we might be able to create micro black holes in the extra dimensions of space time,” Professor Hawking said.

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