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A power failure plunged everything into darkness.

电源故障使一切陷入黑暗。

《牛津词典》

A power failure created an emergency in traffic and transportation.

停电使交通运输陷入紧急状况。

《新英汉大辞典》

The cause of the power failure was still being investigated, as Tepco had made restoring power the priority, spokesman Masayuki Ono said, according to Kyodo news agency.

BBC: Power at Fukushima nuclear fuel ponds restored

The latter proved a somewhat astonishing reminder of forgotten lessons about nuclear power risks, unique to that technology: A failure of one power plant in an isolated location can create a contagion in countries far away, and even where somewhat different variants of that technology are in use.

FORBES: New Centralized Nuclear Plants: Still an Investment Worth Making?

Damage to the grid: Power surges and electrical system failure due to high loads can cause power outages and damage to BC Hydro equipment and infrastructure, including the premature failure of distribution transformers.

FORBES: Electricity Theft: A Bigger Issue Than You Think