The permitting authorities are advised to take into account technical feasibility, cost and other economic, environmental and energy considerations to narrow the options and select the suitable emission reduction options for GHGs by using the best available control technology (BACT) process.

Although in most cases energy efficiency is found to the most cost effective way for industry to reduce GHG emissions, the guidance does not define or require a specific control option for a particular type of source because BACT is determined on a case-by-case basis.

Instead, the guidance and resources provide the basic information that permit writers and applicants need to address GHGs and furnishes with examples of how permitting requirements could apply.

In January 2011, large GHG emitters such as power plants, refineries and cement production facilities that are planning to build new facilities or make major modifications to existing ones will work with permitting authorities to identify and implement BACT to minimize their GHGs.

EPA assistant administrator of office air and radiation, Gina McCarthy said that EPA is working closely with its partners at the state and local levels to ensure permitting for greenhouse gases runs smoothly to reduce the emissions of these gases in a cost effective way.