Dick Shaffer Feb. 5, 2007

Dick ShafferDick ShafferFeb. 5, 2007Feb. 5, 2007

Basin Electric

proposes to build a

second 100 MW

Natural Gas fired

Peaking

Turbine Generator

Basin ElectricBasin Electric

proposes to build a proposes to build a

second 100 MWsecond 100 MW

Natural Gas firedNatural Gas fired

PeakingPeaking

Turbine GeneratorTurbine Generator

Basin Electric Power Cooperative

Basin Electric Power Cooperative

A Touchstone Energy A Touchstone Energy SMSMParterParter

Basin Electric Power CooperativeMEMBER SYSTEMS

Basin Electric Power CooperativeMEMBER SYSTEMS

2006 Summer Capacity2006 Summer Capacity2006 Summer Capacity

Coal – 81%Coal – 81%

Purchases – 8%Purchases – 8%Renewable – 1%Renewable – 1%

Oil – 4%Oil – 4%

Gas – 6%Gas – 6%

AABBFF

CCDD

E

A - Antelope ValleyA - Antelope Valley

B - Leland OldsB - Leland Olds

C - Laramie RiverC - Laramie River

D - Spirit MoundD - Spirit Mound

E - WY Distributive GenerationE - WY Distributive Generation

F - Dakota GasificationF - Dakota Gasification

G - Groton GenerationG - Groton Generation

GG

Wind ResourcesWind Resources

Minot3 MW

Chamberlain2.6 MW

North DakotaSouth Dakota

Edgeley40 MW

Highmore40 MW

SuburbanSuburbanCommercialCommercial

AgAg EnergyEnergy

Basin Service

Area

Basin Basin Service Service

AreaArea

East River Electric Power

Cooperative

East River East River Electric Electric Power Power

CooperativeCooperative

Northern Electric Cooperative, Inc.Northern Electric Northern Electric Cooperative, Inc.Cooperative, Inc.

GrotonGrotonGroton

Major Growth Areas

Major Growth Major Growth AreasAreas

East River

0

100

200

300

400

500

600

700

800

900

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

2013

2015

2017

2019

2021

2004 LF2007 LF - Preliminary

0

100

200

300

400

500

600

700

800

900

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

2013

2015

2017

2019

2021

2004 LF2007 LF - Preliminary

MWEast River

Total Summer PeakEast RiverEast River

Total Summer PeakTotal Summer Peak

•Keystone Pipeline – 40 MW

•Ethanol – 68 MW

•Grain/Poultry/Sugar – 20 MW

•Sioux Falls Area – 216 MW

•Keystone Pipeline – 40 MW

•Ethanol – 68 MW

•Grain/Poultry/Sugar – 20 MW

•Sioux Falls Area – 216 MW

Other Major ConcernsOther Major ConcernsOther Major Concerns

• Low Hydro

• Loss of generator

• Transmission constraints

• Ability to move power into the region

• Low Hydro

• Loss of generator

• Transmission constraints

• Ability to move power into the region

AreaMapAreaAreaMapMap

NBPLNBPL

NBPLNBPL

Groton SiteGroton SiteGroton Groton

SubstationSubstation

T

GrotonGroton

Combustion Turbine Site

WAPA 115 kV SubstationWAPA 115 kV WAPA 115 kV SubstationSubstation

Groton 345 kV SubstationGroton 345 kV Groton 345 kV SubstationSubstation

Groton Property Boundaries

Site PlanSite Plan

GE LMS100GE LMS100GE LMS100

Heavy-duty low pressurecompressor derived fromGE’s Frame Technology

To Intercooler

LM AeroSuper core

5-Stage PowerTurbine

Approximate Water Usage

Approximate Water Approximate Water UsageUsage

• NOx control ~ 50 gpm• Evaporative cooling ~ 25 gpm

• NOx control ~ 50 gpm• Evaporative cooling ~ 25 gpm

Sound Level

Survey

Sound Sound Level Level

SurveySurvey 85 dBAGuarantee

85 dBAGuarantee

65 dBA Guarantee

65 dBA 65 dBA GuaranteeGuarantee

54 dBA Est. Project Noise54 dBA Est. Project Noise54 dBA Est. Project Noise

46-60 dBA Survey

4646--60 dBA 60 dBA SurveySurvey

33-90 dBA Survey3333--90 90 dBAdBA SurveySurvey

Typical Noise LevelsTypical Noise LevelsTypical Noise LevelsTypical Noise Source Noise Level (dBA)Ambulance siren at 100 feet 100

Motorcycle at 25 feet 90Typical construction site 85Single truck at 25 feet 80Urban shopping center 70Single car at 25 feet 65Typical highway at 100 feet 60

Residential area at night 40Residential area during the day 50

Rural area during the day 40Rural area at night 35Quiet whisper 30Threshold of hearing 20

Source: USEPA, 1974, Harris 1991, and Bell 1982Source: USEPA, 1974, Harris 1991, and Bell 1982

Construction ManpowerConstruction ManpowerConstruction Manpower

• 105-145• 40% to 60% Local• 105-145• 40% to 60% Local

Long-term EmploymentLongLong--term Employmentterm Employment

• 2 existing & 1 or 2 additional full-time positions

• 2 existing & 1 or 2 additional full-time positions

Permitting/EnvironmentalPermitting/EnvironmentalPermitting/Environmental

• Special exception permit• Air quality permit• Environmental Assessment• SD Public Utility Commission

• Special exception permit• Air quality permit• Environmental Assessment• SD Public Utility Commission

ScheduleScheduleSchedule

• Summer 2007 – Start Construction• April 2008 – First fire• June 2008 – Commercial operation

• Summer 2007 – Start Construction• April 2008 – First fire• June 2008 – Commercial operation