Page 1Reducing Emissions, Increasing Efficiency, Maximizing Profits

EntergyEntergy

Keith McInerney – Director of Technical Services Keith McInerney – Director of Technical Services

Mike Leger – Manager, Field Services and Damage Mike Leger – Manager, Field Services and Damage PreventionPrevention

Page 2Reducing Emissions, Increasing Efficiency, Maximizing Profits

Entergy New Orleans Distribution System ExperienceEntergy New Orleans Distribution System Experience

High Pressure System (75-125 psig)High Pressure System (75-125 psig) Remote control of City Gate & Key Remote control of City Gate & Key

Regulator StationsRegulator Stations Match Pressure with DemandMatch Pressure with Demand Would prefer to operate at lower Would prefer to operate at lower

pressures during periods of low demand pressures during periods of low demand but have customer delivery pressure but have customer delivery pressure requirementsrequirements

Intermediate Pressure System (8-11 psig)Intermediate Pressure System (8-11 psig) Remote Control of Key Regulator Remote Control of Key Regulator

StationsStations Winter operationWinter operation

Historically operated at 15 psig in Historically operated at 15 psig in winterwinter

Lowered to 11 psig during periods Lowered to 11 psig during periods of low demand of low demand

Typical Summer operation – 8 psigTypical Summer operation – 8 psig

Low Pressure system (7”w.c.)Low Pressure system (7”w.c.)Historically tried to operate system to Historically tried to operate system to

match pressure with demandmatch pressure with demandSummer – 7”w.c. Summer – 7”w.c. Winter – visited key regulator stations Winter – visited key regulator stations

twice a day to adjust pressures twice a day to adjust pressures Mid 1980’s Mid 1980’s

Summer – 7.5 to 8”w.c.Summer – 7.5 to 8”w.c.Winter – 8.5 – 9”w.c. Winter – 8.5 – 9”w.c.

Current Day Current Day Summer – 7”w.c.Summer – 7”w.c.Winter – 8”w.c. (Raise key station Winter – 8”w.c. (Raise key station

outlet pressures during periods of outlet pressures during periods of heavy demand & lower as heavy demand & lower as temperatures increase)temperatures increase)

Entergy Gulf States Distribution System ExperienceEntergy Gulf States Distribution System Experience

Distribution Pressure System (60 psig)Distribution Pressure System (60 psig) Served from series of manual and remote controlled Served from series of manual and remote controlled

Regulator StationsRegulator Stations Historically operated at 60 psig in winter and 18 psig Historically operated at 60 psig in winter and 18 psig

in summerin summer Implemented temperature based control scheme Implemented temperature based control scheme

in early 1990’sin early 1990’s In the mid 1990’s raised normal operating system In the mid 1990’s raised normal operating system

pressure to 40 psig in summer due to increased pressure to 40 psig in summer due to increased demand (began experiencing low pressures on demand (began experiencing low pressures on system)system)

Eventually 60 psig became year round normal Eventually 60 psig became year round normal operating pressure (today’s operation)operating pressure (today’s operation)

Conducted load/pressure study two years ago Conducted load/pressure study two years ago with goal of lowering operating pressure during with goal of lowering operating pressure during summer monthssummer months

Identified several system improvements that were Identified several system improvements that were required to eliminate low pressure areasrequired to eliminate low pressure areas

Improvements will be completed this year and we Improvements will be completed this year and we plan to again adjust outlet pressures to 40 psig for plan to again adjust outlet pressures to 40 psig for summer operationsummer operation

High Pressure System (150 psig)High Pressure System (150 psig) City Gates set on pressure control to City Gates set on pressure control to

maintain constant pressure to maintain constant pressure to backbone system that supplies backbone system that supplies distribution pressure systemdistribution pressure system

Low Pressure system (7”w.c.)Low Pressure system (7”w.c.)Summer – 7.5”w.c. Summer – 7.5”w.c. Winter – raised key regulator Winter – raised key regulator

stations to 9-11’’w.c. stations to 9-11’’w.c. Current Day Current Day

Summer – 7”w.c.Summer – 7”w.c.Winter – 8”w.c. (Raise key Winter – 8”w.c. (Raise key

station outlet pressures during station outlet pressures during periods of heavy demand & periods of heavy demand & lower as temperatures increase)lower as temperatures increase)