lec17-09-lovins - HAS222d Intro to Energy and Environement:...

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HAS222d Intro to Energy and Environement: Lecture 17 week 9 Solutions
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40% off energy use in US goes into generating electricity generation efficiency: 33% electric power loss: plant to consumer 7.2% in US. .costs more than shipping the fossil fuel US average cost: 8.2 cents per KwH (up 10% in past year) http://en.wikipedia.org/wiki/Electric_power_transmission#Losses http://www.energetics.com/gridworks/grid.html US Dept of Energy 10,000 plants
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B. Lomborg, Skeptical Environmentalist We have talked about the 1/10 solution…living with 1/10 our present energy use in the US (thus, about 2 kilowatts per person rather than 20 kilowatts).
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Alternative energies and optimism: we have looked at solar and wind power in some detail. In Lomborg’s ( The Skeptical Environmentalist) book-keeping they represent roughly 0.04% wind 0.009% solar 0.04% biomass 0.12% geothermal 6.6% hydropower 6.4% ‘traditional’ fuel wood and charcoal While these are small fractions of the 4 x 10 20 Joules per year (i.e. divide by seconds-per-year, π x 10 7 , and then 1000 to get an equivalent expression, 1.3 x 10 10 kilowatts) for the 6.75 x 10 9 residents of Earth… 2 Kw per person, 24/7, hydropower and fuel woods are significant and the others are growing very rapidly. Allegedly wind power installations are now cheaper in long term cost than the fossil fuel power generation plants that dominate our electricity production. Remember that electricity represents about 40% of our energy use, and that electric motors are vastly more efficient (~90%) than gasoline engines (~20% or less). But if the electricity is generated at ~33% efficiency in the coal- or oil fired plants, and transmitted to you at 70% efficiency, then on the face of it, your electric motor may be as poor environmentally as you gasoline engine. But one hopes to improve the 33% greatly or at least its environmental impact by scrubbing out the CO2 at the smokestack. By localizing the fossil fuel use, the net effect on the environment could be very good. ‘Efficiency’ needs to include the loss of, and damage to, natural capital and the (I would say huge ) damage to human capital, the cost of overcrowded roads, road building, noise, health hazards from too many cars. (How often do we see editorials in our now-vanishing newspapers crying for a reduction in the 30,000 automobile fatalities in the US each year?). Al Gore’s July 2008 call for electrical energy independence in the next 10 years: all electricity to be generated by green energy sources: is it realistic? Watch Al Gore’s speech: http://www.youtube.com/watch?v=dt9wZloG97U
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Natural Capitalism Hawken, Lovins hear lecture at KUOW Weekday archives (search for Lovins): http://www.kuow.org/defaultProgram.asp?ID=3749 Capital is: money goods …these two are the standards of business but also people natural resources the problem is that these things that are mined, gathered, harvested from Nature are deemed ‘cost-free’ with a value approximately zero
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This note was uploaded on 03/08/2012 for the course H A&S 222b taught by Professor P.b.rhines during the Spring '09 term at University of Washington.

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lec17-09-lovins - HAS222d Intro to Energy and Environement:...

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