«The displacement of a single electron by a billionth of a centimetre at one moment might make the difference between a man being killed by an avalanche a year later, or escaping», wrote Alan Touring in 1950 in "Computing Machines and Intelligence", anticipating the celebrated theory of the butterfly effect. The metaphor is linear, the intention is to make it understood that also an imperceptible small action, such as a butterfly flapping its wings, can determine the future in an unforeseeable way.
If our butterfly becomes a switch, simply turning on the light could generate chain reactions in the electricity system which might trigger a blackout thousands of kilometres away. To avoid this there are the transmission system operators (or TSOs) capable of foreseeing and constantly balancing the supply of and demand for energy. Being well aware of these problems is a measure of the pride that young engineers, specialised in systems for energy, feel when they join Terna, the operator of the Italian national transmission grid. Dario Polinelli, today an open innovation specialist, recounts this experience precisely in this way: «I’m not sure you know: when you switch on the light you slow down all the generators connected to the European grid, but there's someone who makes sure the balance is always constant. As soon as I graduated I wanted to get a job right there».