Publication: UN Chronicle
Publication Date: 01-JUN-07
Delivery: Immediate Online Access
Author: Resch, Rhone ; Kaye, Noah
Article Excerpt
In an increasingly carbon-constrained world, solar energy technologies represent one of the least carbon-intensive means of electricity generation. Solar power produces no emissions during generation itself, and life-cycle assessments clearly demonstrate that it has a smaller carbon footprint from "cradle-to-grave" than fossil fuels.
Of the more than 10,000 terawatt-hours (TWh) of electricity generation produced by the countries of the Organization for Economic Cooperation and Development (OECD), solar currently accounts for just 8 TWh. Yet solar technologies, including photovoltaics, concentrating solar power and solar thermal constitute the fastest growing energy source in the world. With clear market signals from Governments, these low-carbon technologies could provide more than 30 per cent of the world's energy supply in aggregate by 2040.
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Photovoltaics (PV) are perhaps the most well-known and fastest growing sector of solar technology. PV devices generate electricity directly from sunlight via an electric process that occurs naturally in certain types of material. Groups of PV cells are configured into modules and arrays, which can be used to power any number of electrical loads. PV energy systems have very good potential as a low-carbon energy supply technology. A September 2006 joint paper by scientists from Brookhaven National Laboratory, Utrecht University and the Energy Research Center of the Netherlands demonstrates that crystalline silicon PV systems have energy payback times of 1.5 to 2 years for South European locations and 2.7 to 3.5 years for...
NOTE: All illustrations and photos have been removed from this article.
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