1. PSC Case No. 9136 Perryman 6 Constellation Power Source Generation (CPSG)

2. Perryman 6 704-acre site south of Perryman, MD 704-acre site south of Perryman, MD Site currently contains five simple-cycle CT units (Units 1-4 & 51) Site currently contains five simple-cycle CT units (Units 1-4 & 51) Proposed addition of (10) new 60 MW simple- cycle CTs Proposed addition of (10) new 60 MW simple- cycle CTs Nominal Generating Capacity: 355 MW to 955 MW (600 MW addition) Nominal Generating Capacity: 355 MW to 955 MW (600 MW addition)

4. Perryman 6 Air Emission Control Equipment Air Emission Control Equipment NO x : water injection and selective catalytic reaction (SCR) NO x : water injection and selective catalytic reaction (SCR) CO & VOCs: thermal oxidation reaction (TOR) systems CO & VOCs: thermal oxidation reaction (TOR) systems SO 2 & PM: clean-burning fuels (natural gas & ultra- low sulfur diesel (ULSD)) SO 2 & PM: clean-burning fuels (natural gas & ultra- low sulfur diesel (ULSD))

5. Perryman 6 Water Water Proposed Proposed Groundwater: (10) new on-site wells Groundwater: (10) new on-site wells Municipal Water: Harford County Municipal Water: Harford County Other Options Other Options Sod Run? Sod Run? Desalination? Desalination?

6. Perryman 6 Construction anticipated to start in the 3 rd quarter of 2009. Construction anticipated to start in the 3 rd quarter of 2009. All 10 units to be constructed within 5 years. All 10 units to be constructed within 5 years. 2 - 4 units (120 – 240 MW) by June 2010 2 - 4 units (120 – 240 MW) by June 2010 All 10 units (600 MW) by 2014 All 10 units (600 MW) by 2014