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Clear Skies

Under Current Clean Air Act Power Plants Would Face a Complex Set of Requirements

Information provided for informational purposes onlyNote: EPA no longer updates this information, but it may be useful as a reference or resource.
Unless otherwise noted, the data presented throughout this Web site reflect EPA’s 2003 modeling and analysis of the Clear Skies Act of 2003. Clear Skies legislation was intended to create a mandatory program that would dramatically reduce power plant emissions of sulfur dioxide (SO2), nitrogen oxides (NOx), and mercury by setting a national cap on each pollutant. The Clear Skies bill was proposed in response to a growing need for an emission reduction plan that will protect human health and the environment while providing regulatory certainty to the industry. The proposed legislation for air regulation never moved out of the Senate Environment and Public Works committee in 2005 and was therefore never enacted.

 EPA is required to update the new source performance standards (NSPS) for boilers and turbines every 8 years. 2. The SIP-submittal and attainment dates are keyed off the date of designation; for example, if PM or ozone are designated in 2004, the first attainment date is 2009. 1. Further action on ozone would be considered based on the 2007 assessment. NSR Permits for new sources & modifications that increase emissions NSR Permits for new sources & modifications that increase emissions Ozone Acid Rain, PM2.5, Haze, Toxics 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 99  In developing the timeline of current CAA requirements, it was necessary for EPA to make assumptions about rulemakings that have not been completed or, in some case, not even started. EPA’s rulemakings will be conducted through the usual notice-and-comment process, and the conclusions may vary from these assumptions. Second Regional Haze SIPs due Compliance for BART Sources under the Trading Program Compliance for BART Sources Latest attainment date for Fine PM Compliance with Utility MACT New Fine PM NAAQS Implementation Plans Regional Haze SIPs due Final Utility MACT Proposed Utility MACT Designate Areas for Fine PM NAAQS Interstate Transport Rule to Address SO2/ NOx Emissions for Fine PM NAAQS and Regional Haze Phase II Acid Rain Compliance Mercury Determination Serious 8-hr Ozone NAAQS Attainment Date Regional NOx Reductions ? (SIP call II) (Further action on ozone would be considered based on the 2007 assessment.) NOx SIPs Due OTC NOx Trading Ozone 1-hr Serious Attainment Date Designate areas for 8-hr Ozone NAAQS NOx SIP Call Reductions 1-hr Severe Attainment Date Marginal 8-hr Ozone NAAQS Attainment Date 8-hr Ozone Attainment Demonstration SIPs due Assess Effectiveness of Regional Ozone Strategies Moderate 8-hr Ozone NAAQS Attainment Date

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