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PSD and Title V Greenhouse Gas Tailoring Rule

On May 13, 2010, the U.S. Environmental Protection Agency (EPA) issued a final rule that sets thresholds for greenhouse gas (GHG) emissions that define when permits under the New Source Review Prevention of Significant Deterioration (PSD) and title V Operating Permit programs are required for new and existing industrial facilities.

Biogenic Deferral Rule

On November 15, 2011, the Environmental Protection Commission (EPC) approved publication of Adopted & Filed rules (final rules) to amend air quality rules for greenhouse gas emissions. These rules implement recent EPA regulations to defer for a three year period the counting of CO2 emissions from biological processes and materials (biogenic CO2) towards Title V and PSD permitting thresholds. Biogenic emissions of CO2 include fermentation processes at ethanol plants and combustion of biomass such as wood or other vegetative matters at power plants or industrial facilities. The adopted rules match the federal regulations.

The EPC approved the adopted rules to become effective on November 16, 2011. The adopted rules were published in both the Iowa Administrative Code (567 IAC Chapter 33) and in the Iowa Administrative Bulletin (IAB) on December 14, 2011.

GHG Tailoring Rule

On October 19, 2010 the Environmental Protection Commission (EPC) approved publication of Adopted & Filed rules (final rules) to amend air quality rules. The purpose of the rules is to assure that sources of greenhouse gas emissions in Iowa are regulated in the same manner and at the same levels as specified in new federal regulations for greenhouse gases, the Prevention of Significant Deterioration (PSD) and Title V Greenhouse Gas Tailoring Rule (Tailoring Rule). The final rules amend the state’s Title V and PSD air quality rules for greenhouse gas emission regulation such that the state rules match the federal Tailoring Rule.


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