- 8 Temmuz 2018
- Yayınlayan: beadwp
- Kategori: Genel
A tiny rectangle superimposed on the vast expanse of the Sahara captures the seductive appeal of the audacious plan to cut Europe’s carbon emissions by harnessing the fierce power of the desert sun.
Dwarfed by any of the north African nations, it represents an area slightly smaller than Wales but scientists claimed yesterday it could one day generate enough solar energy to supply all of Europe with clean electricity.
Speaking at the Euroscience Open Forum in Barcelona, Arnulf Jaeger-Waldau of the European commission’s Institute for Energy, said it would require the capture of just 0.3% of the light falling on the Sahara and Middle East deserts to meet all of Europe’s energy needs.
The scientists are calling for the creation of a series of huge solar farms – producing electricity either through photovoltaic cells, or by concentrating the sun’s heat to boil water and drive turbines – as part of a plan to share Europe’s renewable energy resources across the continent.
A new supergrid, transmitting electricity along high voltage direct current cables would allow countries such as the UK and Denmark ultimately to export wind energy at times of surplus supply, as well as import from other green sources such as geothermal power in Iceland.
The grid proposal, which has won political support from both Nicholas Sarkozy and Gordon Brown, answers the perennial criticism that renewable power will never be economic because the weather is not sufficiently predictable. Its supporters argue that even if the wind is not blowing hard enough in the North Sea, it will be blowing somewhere else in Europe, or the sun will be shining on a solar farm somewhere.
Scientists argue that harnessing the Sahara would be particularly effective because the sunlight in this area is more intense: solar photovoltaic (PV) panels in northern Africa could generate up to three times the electricity compared with similar panels in northern Europe.
Much of the cost would come in developing the public grid networks of connecting countries in the southern Mediterranean, which do not currently have the spare capacity to carry the electricity that the north African solar farms could generate. Even if high voltage cables between North Africa and Italy would be built or the existing cable between Morocco and Spain would be used, the infrastructure of the transfer countries such as Italy and Spain or Greece or Turkey also needs a major re-structuring, according to Jaeger-Waldau. (source The Guardian )