PSC Case No. PSC Case No. 91369136

Perryman 6Perryman 6Constellation Power Source Constellation Power Source

Generation (CPSG)Generation (CPSG)

Perryman 6Perryman 6

704-acre site south of Perryman, MD704-acre site south of Perryman, MD Site currently contains five simple-Site currently contains five simple-

cycle CT units (Units 1-4 & 51)cycle CT units (Units 1-4 & 51) Proposed addition of (10) new 60 Proposed addition of (10) new 60

MW simple-cycle CTs MW simple-cycle CTs Nominal Generating Capacity: 355 Nominal Generating Capacity: 355

MW to 955 MW (600 MW addition)MW to 955 MW (600 MW addition)

Perryman 6Perryman 6

Air Emission Control EquipmentAir Emission Control Equipment NONOxx : water injection and selective : water injection and selective

catalytic reaction (SCR)catalytic reaction (SCR) CO & VOCs: thermal oxidation reaction CO & VOCs: thermal oxidation reaction

(TOR) systems(TOR) systems SOSO22 & PM: clean-burning fuels (natural & PM: clean-burning fuels (natural

gas & ultra-low sulfur diesel (ULSD))gas & ultra-low sulfur diesel (ULSD))

Perryman 6Perryman 6

WaterWater ProposedProposed

Groundwater: (10) new on-site wellsGroundwater: (10) new on-site wells Municipal Water: Harford CountyMunicipal Water: Harford County

Other OptionsOther Options Sod Run?Sod Run? Desalination?Desalination?

Perryman 6Perryman 6 Construction anticipated to start in Construction anticipated to start in

the 3the 3rdrd quarter of 2009. quarter of 2009. All 10 units to be constructed within All 10 units to be constructed within

5 years.5 years. 2 - 4 units (120 – 240 MW) by June 2 - 4 units (120 – 240 MW) by June

20102010 All 10 units (600 MW) by 2014All 10 units (600 MW) by 2014