Market Prices
The U.S. Department of Energy in 1991 estimated the installed retrofit cost per ton of SO2 pollution control equipment (scrubbers) on existing units would be in the $665– $736/ton range. However, 2005 was the first year the price of an SO2 allowance reached this level. In fall 2006, a few trades were registered at slightly over $1,600/ton. At those rates, it was less expensive to install scrubbers and reduce air pollution than to purchase SO2 emissions allowances and continue polluting. Subsequently, the market price of SO2 allowances decreased to around $88/ton in August 2009.
Read more about this topic: Acid Rain Program
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