Friday, October 26, 2007

Can solar be the ultimate energy source on Earth?

In my last column I pointed out that solar energy is – with exception of energy derived from nuclear, geothermal, tidal sources – the fundamental source of all energy on earth. Also mentioned was the fact that 90 petawatts – that's 90,000,000,000,000,000 watts for those who like to count the zeroes – of sunlight fall on the earth each day.Where's my solar power missing? And if the sunlight falling on earth at six specific locations was converted to electricity, the energy would more than meet current world needs (15 terawatts). So why haven't the governments of Algeria, Australia, Chile, China, Saudi Arabia & USA (the countries in which these locations are present) built solar conversion facilities at these locations? There are a number of technical reasons, but the principal reason is economic.

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Source: IIPM Editorial, 2006

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