Cory Cogeneration Station
Technical
Information and Project Backgrounder
In
July of 1999 SaskPower International invited potential joint venture participants
to express their interest in pursuing the development of cogeneration
projects within and outside of Saskatchewan. ATCO Power was selected and
in October of 1999 the joint venture of ATCO Power and SaskPower International
commenced evaluating potential sites in Saskatchewan. After several site
evaluations, Potash Corporation of Saskatchewan (PCS) Cory was selected
as the optimal site both technically and economically.
The
proposed plant will consist of two natural gas fuelled combustion turbines
and generators. The exhaust gases from each gas turbine will be sent through
a waste heat recovery boiler to produce steam. This steam will be used
to power a steam turbine as well as provide all of PCS Cory’s steam
requirements.
The
plant will be located on PCS’s Cory site 6.4 km west of the city
of Saskatoon. The joint venture is currently negotiating commercial and
technical terms and conditions with PCS. The Cory Cogeneration Station
will utilize site space of approximately 250 metres by 100 metres.
All
electricity produced will be sold to SaskPower Corporation under a 25-year
power purchase agreement.
The
$228 million, Cory Cogeneration Station will have an annual average capability
of 228 MW. Major components are:
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Two
— GE PG7121EA Gas turbines rated at 85 MW |
| • |
Two
— 13.8 kV Generators rated at 100 MVA @ 0.85 power factor |
| • |
Two
— Heat Recovery Steam Generators rated at 140 tonnes per hour
of 83 bar steam
|
| • |
One
— Steam Turbine rated at 90 MW |
| • |
Three
— 13.8 to 144 kV step-up transformers rated at 125 MVA |
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Plant
electrical and auxiliary equipment |
| • |
Acoustical
enclosures for gas turbines |
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Natural
gas fuel interconnection to TransGas system |
| • |
Water
supply pipeline interconnection to SaskWater system |
The
Cory Cogeneration Station will be connected to the Saskatchewan Transmission
Grid by a new 8-km long 144 kV transmission line.
Fuel
requirements will be supplied through the existing TransGas system, which
has an existing pipeline supplying PCS Cory. The gas interconnections
between the cogeneration station and the TransGas system will be owned
by the joint venture. The fuel is sweet gas that meets the Saskatchewan
Gas System Specifications.
The
water requirements are less than one tenth of one per cent of the river
flow and will have a very minimal affect on the River.
The
plant will be base loaded at 80 MW to supply PCS’s steam needs. The
plant will be dispatchable between 80 MW and 228 MW. SaskPower will provide
dispatch instructions for the station based on their requirements.
The
Cory Cogeneration Station’s ‘state of the art’ design will
enable it to generate electricity with minimal effect on the environment.
Both of the gas turbines and heat recovery steam generators will be equipped
with low NoX combustors to minimize impacts. The Cory Cogeneration Station
will turn more than 50% of the natural gas’s potential energy into
electricity — compared to an average of 35% achieved by conventional
power stations, while emissions of "greenhouse" gases are only
about one third of similarly sized coal fired power station. As well,
further reduction in "greenhouse" gases is realized as PCS is
no longer using boilers to produce steam and instead is using the waste
heat from the gas turbines.
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