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Researchers calculate the cost of CO2 emissions, call for carbon tax
Date:7/7/2010

oduction to a system based on natural gas. The authors said policymakers should encourage this transition, but they doubt whether natural gas supplies will be adequate to maintain this shift in the long run. Development of nuclear and renewable electricity generation will need to continue at a rapid pace. Natural gas, however, can be the transition technology to carbon-neutral electrical generation. "Unless or until there is a technological breakthrough in carbon sequestration," Brito and Curl wrote, "the carbon intensity of coal means that 'clean coal' cannot be an important factor in reducing carbon dioxide. Replacing existing coal generation capacity with modern coal generation plants can only reduce total carbon dioxide by 5 percent."

The authors noted that the efficiency of coal generators is very concentrated. For instance, "at current prices for fuels, a carbon price of approximately $30/ metric ton (MT) will shut down 10 percent of coal generator capacity," they wrote. "An additional increase of $15 resulting in a carbon dioxide price of $45/MT will shut down 90 percent of coal generator capacity."

The narrow range for the price of carbon dioxide means that coal generator capacity is very sensitive to the price of carbon dioxide emissions. Consequently, small variations in the price of carbon dioxide emissions can lead to large variations in the amount of electricity supplied by coal generators. The market in carbon dioxide permits could possibly create volatility in the market for electricity.

As a result of the risk of high volatility, the authors back a carbon tax to assist the transition from coal to natural gas. They also assert "it is possible to decouple the pricing of allocations for transportation fuel from the allocations for the production of electricity," because the rise in carbon prices needed to effect the shift in electricity generation would have very little impact on transportation fuels.


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Contact: David Ruth
druth@rice.edu
713-348-6327
Rice University
Source:Eurekalert

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