1. Massachusetts’ 4-Pollutant Power Plant Regulations Sharon Weber Massachusetts Department of Environmental Protection Air Innovations Conference - August 11, 2004 - Chicago, IL

2. August 11, 20042 Affected Facilities’ Contribution to Generation and Emissions 6 affected facilities represent 19% of 2003 New England megawatts of generating capacity The 6 facilities emit a substantial portion of MA emissions: 46% of 1996 SO 2 8% of 1996 NO x 17% of 2002 point source mercury All MA electricity production was projected to account for 29% of 2000 CO 2

3. August 11, 20043 Major Provisions Effective May 11, 2001 Standards Output-Based Emission Rates - SO 2, NO x, CO 2 Annual caps for CO 2 (tons) and Hg (lbs) Hg data collection for cap and 2003 proposed standard Hg control feasibility report by December 2002 Compliance schedules Dates depend on compliance approach standard path - 10/04 and 10/06 repowering path - 10/06 and 10/08 Hg cap effective at first compliance date

4. August 11, 20044 Mercury Standard Setting Process Regulation 310 CMR 7.29: Emissions Standards for Power Plants: promulgated May 11, 2001 http://www.state.ma.us/dep/bwp/daqc/files/regs/7c.htm#29 Mercury coal/emissions baseline testing: 2001-2002 Stakeholder meetings: Aug/Sep/Oct 2002, Jan 2003 Feasibility Report: December 2002 http://www.state.ma.us/dep/bwp/daqc/daqcpubs.htm#other Proposed regulation: September 2003 Final regulation: released May, effective June 4, 2004 http://www.mass.gov/dep/bwp/daqc/daqcpubs.htm#regs

5. August 11, 20045 Mercury Control Feasibility Report – December 2002 “Evaluation of the Technological and Economic Feasibility of Controlling and Eliminating Mercury Emissions from the Combustion of Solid Fossil Fuel” 85-90+% removal of flue gas Mercury is feasible

6. August 11, 20046 Final Mercury Standard Effective June 4, 2004 Form of the standard Output-based and % control efficiency options Level of the standard Phase 1: 85% or 0.0075 lb/GWh by 1/1/2008 Phase 2: 95% or 0.0025 lb/GWh by 10/1/2012 Demonstrating compliance with the standard Every other quarter stack tests 10/06-1/1/2008 CEMs required beginning 1/1/2008 Averaging time of the standard Rolling 12-month basis

7. August 11, 20047 Media Transfer & Off-Site Mercury Reductions Facility mercury caps include mercury emissions due to on-site re-burn of ash or off-site high temperature processing in Massachusetts (e.g., use of ash in cement kiln or asphalt batching plant) Mercury standards must be met while including mercury emissions due to on-site re-burn of ash Units shutting down can use early or off-site reductions to 2010. Facilities emitting less than 5 lb in 2001 can use early or off site reductions to phase 2.

8. August 11, 20048 Expected Annual Reductions due to 2001 and 2004 Standards SO 2 : 50-75% (about 56,000-84,000 tons) NO x : 50% (about 15,000 tons) CO 2 : 10% (about 1,954,000 tons, implemented on-site or off-site) Mercury: 85% (about 155 pounds)