The energy transition is the focus of much discussion. To read the accounts in the mainstream media, one gets the impression that renewable energy is being rolled out quickly and is on its way to replacing fossil fuels without much ado, while generating new green jobs. If the claims of Jeremy Rifkin are to be believed, renewable energy will become cheaper and cheaper, on the model of computers and telecommunications. But what is the current combined share of solar photovoltaic energy and solar thermal energy, wind and tidal energy, and geothermal energy? (I am not including hydroelectric power and biomass here. While they are arguably forms of renewable energy, they are typically looked at separately because, having reached maturity, they have limited potential for expansion, unlike solar and wind power which remain underexploited.) People tend to think it constitutes 5, 10 or even 20 per cent of total energy […]