Future skyscrapers will harvest energy from the sun with photovoltaic windows
By 2020, 8.3 billion square meters of flat glass will be installed annually in new buildings worldwide, according to the Freedonia Group. That area, covered in standard solar panels in the ideal orientation, could produce more than a terawatt at peak output, and over one year it could generate some 2,190 terawatt-hours. That’s 9 percent of what the world’s annual electricity consumption was in 2016. Substituting this source of energy for coal in 2017 would have saved about 1.6 percent of carbon emissions from fossil fuels, industry, and changes in forestry and land use.
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