HomeMy WebLinkAboutUnalaska Makushin Power Project update 1997Unalaska Power Project
Exergy,Inc.
Presented to the City of Unalaska
June 17,1997
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'Much Has Happened Since Our Last Meeting In March
"IT have some good news and bad news."
First,the Bad News ....
¢Exergy has withdrawn from the Makushin Geothermal Project
¢AIDEA informed us in May that they would not fund the
project due to its requirements type power sale contract _-hurts AAA bond rating jJoesw!fh AibxA's veshnotDrolile
¢The City and the processors will not sign a take-or-pay
contract
Now,the Good News....
¢Exergy believes a better solution exists
¢17 MW combustion turbine combined cycle
*$60 million less capital cost
*-Half the lead time
*Less permitting
*Privately financed
-No State of Alaska or AIDEA ownership
*Requirements contract
*Lower generation cost
Combined Cycles are Very Popular
¢Based on combustion turbine (jet engine)technology
¢The dominant form of new generation in the U.S.over the past
ten years
¢Worldwide new CC capacity additions are approximately
30,000 MW per year (1000 times greater than the total
capacity in Unalaska)
e¢Natural gas or oil
e Advantages
*Low capacity cost*-High efficiency*-Short lead times*Very reliable/easy to operate
What is a Combined Cycle
It isa combination of a combustion turbine (topping cycle;operates at 2000°F -2400 °F)and a heat recovery bottoming cycle(operates at 1000°F)
Combustion Turbine
2000°F -2400°F
Heat Recovery1000°F
Topping
Bottoming
GE LM6000 Gas Turbine
Dry Low NOx Combustion System
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Conventional Combined Cycle (Rankine)Bottoming Cycle
T e Single working fluid
Comb --Heat-recovery Steam
Gas Tutine |oT chau Generator (HRSG)
Air Gas produces steam to drive
Steam Generator steam turbine
SteamWaterGe -Limits energy from the:ST G .reegystemn gas-turbine exhaust
Heal Rejection r@ Condenser that can be effectively
a used in the bottoming
Cooling cycleWater
Combined Cycle with Kalina Bottoming Cycle
e Mixed (ammonia/water)Fuel ..:working fluid
Comb M -Heat Recovery Vapor
Cc T G---ke [LH -Generator (HRVG)
ii Gas produces vapor to driveir.
Heat Recovery turbine
"eee a Vapor e Conventional axial-flow
Liqua|turbine exhausting abovePowterGenerationorGatmosphericpressure
Heat Rejection.i @||-smaller,simpleryslem.(0CSS)¢No special materials
Numbers in P .umes 8 O -Permits transfer of more
Concentrations -Condenser _]Absorber energy
Cooling CoolingWaterWater e Greater efficiency
e Higher output
Unalaska Combined Cycle
17 MW rated capacity at 40°F ambient-Two (2)combustion turbines;5200 kW each
-One (1)vapor turbine;6000 kW
No.2 oil-fired
7500 Btu/hr heat rate
-Approximately 40%more efficient than diesels
Two (2)sites in Unalaska have been offered.Each contains
barge docking,fuel storage and plant site.
City and processors to be grid-connected in one network.Capability of self generation and/or purchase from central
Station.
MaximumDailyLoad(kW)Unalaska Loads
-1993
)
m Cit Ind.Ld #4
QOlnd.Ld #1 Eilnd.Ld #5
Mind.Ld #2 Ond.Ld #6
EAlnd.Ld #3
ao[a]oOoO1-30-28-29-27-26-24-23-21-19-18-16-15-
Jan Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Project Team
Exergy -developer,technology
¢General Electric ()-combustion turbine supplier
licensee
plant operator (if appropriate)
e Walsh Construction -EPC
¢Power Engineers -Plant Engineer
(1)General Electric is the exclusive,worldwide licensee of the
Kalina Cycle technology for combined cycle
Status
¢Overall plant design specified
¢Budget plant cost and performance completed
e Site selection proposals being evaluated
e Permit process begun
e Draft of power sale term sheet submitted to the City
e Grid-connect design study updated to reflect Unalaska power
station
Next
«Is the City interested?
*Evaluate contractual relationship for power sale
*Input from processors
*Plant operation
*What is the City's preference?