The size of the world economy is about $60 trillion. World oil production is about 90 million barrels per day. At $100 per barrel, the world spends $3.3 trillion (or 5% of its output) on crude. What about electricity? The world electricity production is about 20,000 TWh. At $0.05 kWh (wholesale price), the world spends about $1 trillion on electricity (wholesale).
National Geographic has a nice map of world electricity consumption. They project electricity consumption to rise from 20k TWh to 35k TWh by 2035 (that corresponds to about 2.5% annual growth). Can we achieve this in a sustainable fashion?
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