But what, exactly, is that hum? And more important, is it ever a sign of danger? The sound electricity makes is known as the "mains hum," and it happens because of the way electricity is produced.

Water mains need power for those devices. Conventionally, they are putting small turbines into our pipes to produce electricity from drinking water. Our water main pipes present a real challenge.

A tiny diving board can extract power from the magnetic fields around mains cables, according to Penn State university. The device is a magneto-electric-coupled magneto-mechano-electric (ME MME) ...

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But there are a hardy few who already live their lives "off-grid", getting by just fine without mains electricity or mains water. Among them is 83-year-old Margaret Gallagher, who still lives in ...

Each little turbine is able to pump out 80 volts, enough energy to power about four fluorescent light bulbs. Water mains present a challenge for designers looking to turn them into sources of power.

The original cable under the lake had supplied the village with electricity since 1977 A remote Cumbrian village which has been without mains electricity for 10 months has had its power restored.