Entergy

1. Entergy • Keith McInerney – Director of Technical Services • Mike Leger – Manager, Field Services and Damage Prevention

2. Entergy New Orleans Distribution System Experience • Low Pressure system (7”w.c.) • 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 • Mid 1980’s • Summer – 7.5 to 8”w.c. • Winter – 8.5 – 9”w.c. • Current Day • Summer – 7”w.c. • Winter – 8”w.c. (Raise key station outlet pressures during periods of heavy demand & lower as temperatures increase) • High Pressure System (75-125 psig) • Remote control of City Gate & Key Regulator Stations • Match Pressure with Demand • Would prefer to operate at lower pressures during periods of low demand but have customer delivery pressure requirements • Intermediate Pressure System (8-11 psig) • Remote Control of Key Regulator Stations • Winter operation • Historically operated at 15 psig in winter • Lowered to 11 psig during periods of low demand • Typical Summer operation – 8 psig

3. Entergy Gulf States Distribution System Experience • High Pressure System (150 psig) • City Gates set on pressure control to maintain constant pressure to backbone system that supplies distribution pressure system • Low Pressure system (7”w.c.) • Summer – 7.5”w.c. • Winter – raised key regulator stations to 9-11’’w.c. • Current Day • Summer – 7”w.c. • Winter – 8”w.c. (Raise key station outlet pressures during periods of heavy demand & lower as temperatures increase) • Distribution Pressure System (60 psig) • Served from series of manual and remote controlled Regulator Stations • Historically operated at 60 psig in winter and 18 psig in summer • Implemented temperature based control scheme in early 1990’s • 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) • 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