Page 1 Reducing Emissions, Increasing Efficiency, Maximizing Profits Entergy p Keith McInerney – Director of Technical Services p Mike Leger – Manager, Field Services and Damage Prevention

Page 2 Reducing Emissions, Increasing Efficiency, Maximizing Profits Entergy New Orleans Distribution System Experience p High Pressure System ( psig) u Remote control of City Gate & Key Regulator Stations u Match Pressure with Demand u Would prefer to operate at lower pressures during periods of low demand but have customer delivery pressure requirements p Intermediate Pressure System (8-11 psig) u Remote Control of Key Regulator Stations u Winter operation  Historically operated at 15 psig in winter  Lowered to 11 psig during periods of low demand u Typical Summer operation – 8 psig p Low Pressure system (7”w.c.) u Historically tried to operate system to match pressure with demand  Summer – 7”w.c.  Winter – visited key regulator stations twice a day to adjust pressures u Mid 1980’s  Summer – 7.5 to 8”w.c.  Winter – 8.5 – 9”w.c. u Current Day  Summer – 7”w.c.  Winter – 8”w.c. (Raise key station outlet pressures during periods of heavy demand & lower as temperatures increase)

Entergy Gulf States Distribution System Experience p Distribution Pressure System (60 psig) u Served from series of manual and remote controlled Regulator Stations u Historically operated at 60 psig in winter and 18 psig in summer  Implemented temperature based control scheme in early 1990’s u In the mid 1990’s raised normal operating system pressure to 40 psig in summer due to increased demand (began experiencing low pressures on system) u Eventually 60 psig became year round normal operating pressure (today’s operation)  Conducted load/pressure study two years ago with goal of lowering operating pressure during summer months  Identified several system improvements that were required to eliminate low pressure areas  Improvements will be completed this year and we plan to again adjust outlet pressures to 40 psig for summer operation p High Pressure System (150 psig) u City Gates set on pressure control to maintain constant pressure to backbone system that supplies distribution pressure system p Low Pressure system (7”w.c.)  Summer – 7.5”w.c.  Winter – raised key regulator stations to 9-11’’w.c. u Current Day  Summer – 7”w.c.  Winter – 8”w.c. (Raise key station outlet pressures during periods of heavy demand & lower as temperatures increase)