I walked past one of those JDDecaux electronic advertising boards at Tesco a few days ago, and it was chucking out as much heat from a ventilator fan as a small space heater (I looked around to check if there was any airco exhaust nearby but there wasn't, it was just this device). I can fully understand the climate activists in France and other European countries switching these things off at the emergency circuit breaker, they really must use a lot of power..