The process of turning mechanical energy into electrical power is pretty fascinating. You may remember turning a magnet near a coil and seeing a light bulb illuminate at school? In practice, power generation in the real world is fairly similar; an electromagnet is spun by a turbine (through wind, water, steam or a combustion engine) and power is produced. In practice, this electro-magnet may be over 100 tonnes, spinning at 3000 times a minute within a stationary coil weighing hundreds of tonnes. The largest generators being manufactured at the moment are rated in excess of 1.5 GW (gigawatts, or billion watts – enough to power three million UK homes). Whether being driven by wind, water steam or gas turbines, all generators are made of the same parts.