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The national grid's reliance on gas, the most expensive source of power, keeps bills high - even if there's also large-scale generation coming from cheaper renewable sources, like wind power.

Officers continue to support the London Fire Brigade, the National Grid and "other partners" to investigate the cause of the blaze.

Substations, operated by the National Grid, are designed to produce, convert, and distribute electricity at suitable voltage levels.

Zengamina Hydro has secured a large investment to help them expand to more villages and join up to the national grid.

Soon the excess energy the mine was harvesting will be sold back to the national grid and mining bitcoin will no longer be profitable at Zengamina.