WAT TS AND VOLTS WE RE SELF SUFFICIENT The future always hits the cities first And the Little Mermaid in Copenhagen s harbor had already seen a lot the first airplanes the first automobiles the first avant gardists of the 1960s who beheaded her But wind turbines in the water in 2000 that was a new sight to behold even for the mermaid By 2025 Copenhagen will be self sufficient in terms of carbon neutral electricity supply as the first capital city in the world the city government has prom ised The 20 wind turbines which the city built in the Øresund back in 2000 within sight of the famous mer maid marked the first step A small city as a role mod el for the world Clearly cities are growing at a rapid pace which makes urban agglomerations hotspots of energy con sumption Especially in countries like India and China the demand for energy has increased as much as three fold since 1990 If the current trend continues the worldwide energy requirement will more than double again by 2050 Today urban centers already account for two thirds of the energy consumption according to a Siemens study and based on the Paris Climate Agreement the energy demand should be covered by renewables But whereas sparsely populated rural regions can satisfy their elec tricity requirements with a few wind turbines and solar systems the possibilities of the big cities are limited Even in a city like Berlin with a population of 3 6 million only five large wind turbines exist today all of them lo cated on the outskirts In spite of solar systems on many roofs of the city Germany s capital by its own account is not even able to produce four percent of its electrici ty demand itself In terms of thermal energy for heating and fuels for automobiles the rate is practically zero In multi million urban agglomerations like Tokyo Delhi New York or Shanghai the situation is even worse Cities as eco pioneers Actually though the inhabitants of high density big cities have the opportunity to be the real eco pioneers be cause in terms of energy consumption the individual ur banite regularly does better than people living outside of cities In Germany for instance average CO2 emissions amount to 11 metric tons 12 short tons per capita and year In Hamburg by contrast it is six metric tons 6 6 short tons and in Berlin only about five 5 5 per capita In Paris London Singapore Moscow and Hong Kong the individual citizen uses comparably little energy as well The reason is simple People in the city have relatively short distances to travel are less dependent on cars and have better opportunities to switch to bicycles buses and trains Apartments in cities are smaller as well They con sume less energy for heating than detached houses in the countryside Large dense and compact conditions that are not conducive to quality of life present a major opportu nity for climate protection and energy supply particular ly if in addition to offices and residential areas industrial infrastructures are present as well Let s take Hamburg for example There an old copper smelting plant in the Veddel industrial harbor will supply the new Hafen City with heat in the future The pipes are currently being built Or take high rises The architects of the Bahrain World Trade Center integrated three wind turbines in the 240 meter 787 4 foot tall twin towers that supply as much as an eighth of the energy required by the build ing Mobility is another example In cities like Berlin only one in two people has a driver s license for auto mobiles Instead rental cars rental bikes and the pub lic transit system with buses and trains are available throughout the city If all of this can be used via a sin gle app like planned in Munich and other places mo bility of the future has to some extent already become reality says Weert Canzler The mobility expert at the WZB Berlin Social Science Center is convinced that ve hicles with efficient electric powertrains are the future And that this future will begin in the cities Those who harvest wind produce electric current Copenhagen s most important energy source is in the ocean 61 here and now

Vorschau Schaeffler tomorrow 02-2018 EN Seite 61
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