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Final MATS to be issued by December 16, 2011

Utility Maximum Achievable Control Technology (MACT) Rule

EPA proposed the Mercury and Air Toxics Standards on March 16, 2011. The EPA issued the final standards on December 16, 2011. Since proposing this rule, EPA updated some of the mercury emissions data used to develop the proposed standards. The rules will prevent 91 percent of the mercury in coal from entering the air and much of the soot as well: According to EPA estimates, they will prevent 11,000 heart attacks and 120,000 asthma attacks annually by 2016.

The new rules will cost utilities $10.6 billion by 2016 for the installation of control equipment known as scrubbers, according to EPA estimates. But the EPA said those costs would be far offset by health benefits. The agency estimates that as of 2016, lowering emissions would save $59 billion to $140 billion in annual health costs, preventing 17,000 premature deaths a year along with illnesses and lost workdays. (EPA, Wash Post, 12/16/2011)


What is the Utility MACT (National Emissions Standards for Hazardous Air Pollutants [NESHAP] for Coal- and Oil- Fueled Electricity Generating Units)?

The Clean Air Act requires the Environmental Protection Agency (EPA) to regulate hazardous air pollutants, through the National Emissions Standards for Hazardous Air Pollutants program established in Sec. 112 of the Act. EPA must identify sources of the 188 hazardous air pollutants (HAPs) listed in section 112(b), including acid gases, asbestos, dioxin, benzene, chlorine, lead compounds, mercury, phosphorus, various metals and others. Major sources of these pollutants are those that emit 10 tons per year of a single HAP or 25 tons per year or more combined of several HAPs.

EPA promulgates technology-based standards for reducing HAP emissions using maximum achievable control technology (MACT) for both new and existing sources. Determination of the MACT considers a number of factors, including cost, energy requirements, and non-air quality health and environmental impacts.

As with some other Act programs, the Federal government establishes and state air quality programs implement NESHAP programs.

Who are the covered entities?

Starting with the mandate of the Clean Air Act Amendments of 1990 and then revised every eight years, EPA determines a list of categories and subcategories of sources of HAPs. After Congressionally-mandated EPA studies indicated that other rules were not substantially reducing HAP emissions from coal- and oil-fueled power plants, these plants were determined to be source categories of HAPs in 2000. Mercury is the most significant HAP emitted from coal- and oil-fueled power plants. These power plants are also significant emitters of other carcinogenic HAP metals, such as arsenic, nickel, cadmium, and chromium; HAP metals with potentially serious non-cancer health effect such as lead and selenium; and other toxic air pollutants such as the acid gases hydrogen chloride and hydrogen fluoride. There are 1,325 units at 525 power plants around the United States that will need to comply with the recently announced rule. Some of those power plants are more than fifty years old, and complying with the new regulations will be significantly more challenging and expensive than for newer facilities. Some of these older plants may be retired rather than incur the costs of installing new pollution control equipment.

What is the status of regulation?

After coal- and oil-fueled power plants were determined to be a source category in 2000 and therefore subject to regulation, EPA undertook to regulate mercury from these sources. This Bush Administration rule was known as the Clean Air Mercury Rule (CAMR) and would have instituted a cap-and-trade program for mercury emissions. A court ruled that EPA must regulate HAPs under section 112 and not under another section as proposed in CAMR. It vacated the 2005 rulemaking. EPA’s new utility MACT rule was proposed in March 2011, and scheduled to be finalized in November 2011. EPA delayed the final rule for a month, until December 16, 2011.

In September 2011, the House of Representatives passed H.R. 2401, the Transparency in Regulatory Analysis of Impacts on the Nation (TRAIN) Act, that would, among other regulations, delay implementation of the Utility MACT rule pending completion of additional economic studies (other than those EPA and the Office of Management and Budget have already conducted). This bill is unlikely to advance in the Senate. (Center for Climate and Energy Solutions)