Air Pollution Control Equipment Services, Emissions

EPA rule will lower power plant mercury emissions

16 March 2005 – The US Environmental Protection Agency introduced Tuesday the Clean Air Mercury Rule, a rule that will significantly reduce mercury emissions from coal-fired power plants across the country. Taken together, the recently issued Clean Air Interstate Rule and the new Clean Air Mercury Rule will reduce electric utility mercury emissions by nearly 70 per cent from 1999 levels when fully implemented.

“This rule marks the first time the United States has regulated mercury emissions from power plants,” Acting Administrator Steve Johnson said. “In so doing, we become the first nation in the world to address this remaining source of mercury pollution.”

The new legislation is likely to meet with opposition from those who believe that the targets are too modest and that greater mercury pollution reductions can easily be achieved given the latest technology.

The Clean Air Mercury Rule will require reductions at the largest remaining source of human-generated mercury emissions, electric utilities. Mercury is a persistent, toxic pollutant that accumulates in the food chain. While concentrations of mercury in the air are usually low, mercury emissions can reach lakes, rivers and estuaries and eventually build up in fish tissue. Americans are exposed to mercury primarily by eating certain species of fish.

Johnson noted that close to 80 per cent of the fish Americans buy comes from overseas, from other countries and from waters beyond our reach and control. The United States contributes just a small percentage of human-caused mercury emissions worldwide – roughly three per cent with US utilities responsible for about one per cent of that.

“Airborne mercury knows no boundaries; it is a global problem. Until global mercury emissions can be reduced – and more importantly, until mercury concentrations in fish caught and sold globally are reduced – it is very important for women of child-bearing age to pay attention to the advisory issued by EPA and FDA, avoiding certain types of fish and limiting their consumption of other types of fish,” Johnson added.

The new rule limits mercury emissions from new and existing coal-fired power plants, and creates a market-based cap-and-trade programme that will permanently cap utility mercury emissions in two phases: the first phase cap is 38 tons beginning in 2010, with a final cap set at 15 tons beginning in 2018. These mandatory declining caps, coupled with significant penalties for non-compliance, will ensure that mercury reduction requirements are achieved and sustained.

The plan to trade mercury emissions is controversial as it allows plant operators to continue operating at current mercury emission levels, exposing their local community, and instead purchase certificates to cover the required target.

The cap-and-trade system established under the rule also creates incentives for continued development and testing of promising mercury control technologies that are efficient and effective, and that could later be used in other parts of the world. In addition, by making mercury emissions a tradable commodity, the system provides a motivation for some utilities to make early emission reductions and for continuous improvements in control technologies.

“We remain committed to working with Congress to help advance the President’s Clear Skies legislation in order to achieve greater certainty and nationwide emissions reductions,” said Steve Johnson. “But we need regulations in place now.”