The amount of electricity used is also a way of metering how many people watch. On certain occasions in Ireland the Electricity Supply Board has had to vary the supply as every household in the country goes to take a break and put on the kettle for a pot of tea when there's a particularly sensational current affairs show on TV; the usage will already be far higher than normal, then there's a surge at the ad break. So if you don't want to add to the figures, go for a walk during that couple of hours.