The search widens for hot rocks that provide power

Temperatures in Earth’s core, which starts at 2,890km (1,800 miles) below the surface, can reach 5,400°C, about the same temperature as the surface of the Sun. This heat moves upward over time and molten rock known as magma creeps toward the surface, carrying enormous heat.

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Pubs deluged with beer garden bookings

"We're almost fully booked for the first week of opening and have already got about 2,500 people booked in for the first two weeks, even though we haven't gone out to tell customers," says pub owner Tim Foster, who runs the four-strong Yummy Pubs chain.

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