While I was cooking supper the electricity went off.

我正在做晚饭时停电了。

youdao

Then the electricity went off at the Fukushima Daiichi Nuclear Power Station, and a random act of natural destruction became a parable of technological society run amok.

但福岛第一核电站的电力随之中断，一系列的自然灾害随之转变为一场典型的由于科技失控而引发的社会危机。

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The light went out. The electricity must be off.

灯熄了，一定是停电了。 我考试失败了。你一定认为我很笨吧。

youdao

United Utilities said the electricity went off in about 1, 300 households in the Eccles area at 1430 BST due to an underground cable fault.

BBC: Eccles homes hit by power cut during England match