Temperature - European Investment Bank

WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD.
Mount Coffee HPP ESIA and RAP 2012-09-18
ESIA Report Page 195
expansion scenario presenting the lowest net present value of cost is then considered as
the most attractive one.
To determine the least-cost energy system expansion the following main assumptions
were applied:
� Period of study: 2010-2040
� Time step for the computations: 5 year
� All the costs and benefits were discounted to the beginning of the calendar year
2010
� All the economic figures were expressed in US $ of 2009
� A discount rate of 12% was used.
The least cost energy system expansion was computed for the Slow-Growth and the
High-Growth Scenario. A large number of sensitivity analyses were carried out. For the
present study however, only the results obtained for the Base Case are given in the
continuation.
The following power plants, respectively sources of energy, have to be commissioned in
the period 2010-2040 in the Slow-Growth Scenario:
� Diesel
� HFO
� WAPP
� Hydro Mount Coffee
� Hydro St Paul
� Hydro Mano.
The options Leasing Diesel and Biomass were not considered.
Mount Coffee Hydropower Plant with the alternative 36 MW has to be commissioned in
the year 2015, while the option Saint Paul is expected to start its operation in the year
2020.
The average generation cost for this capacity expansion scenario varies between 14.0
US cents /kWh and 11.0 US cents/kWh over the considered time horizon.
The following power plants, respectively sources of energy, have to be commissioned in
the period 2010-2040 in the High-Growth Scenario:
� Diesel
� Leasing Diesel
� HFO
� WAPP
� Hydro Mount Coffee
� Hydro St Paul
� Hydro Mano.