Solar Thermal Power Plants - Renewable Energy: Technology, Economics and Environment - page 210

factured in series. Thus, if serial production of 1,000 systems per year (i.e.
10 MW/a of installed capacity) is assumed, the unit costs for the entire system
amount to approximately 45,000 € or 4,500 €/kW plus shipping, assembly, com-
missioning, planning, engineering and consulting /5-39/. The concentrator includ-
ing support structure, drive units and foundation contributes for the major share
(Table 5.12).

Table 5.11 Technical data of the assessed 10 kW dish/Stirling system (also see /5-38/)
Nominal capacity 10 kW

Concentrator diameter 8.5 m

Full-load hours 2,400 h/a

Storage capacity none

Solar share 100 %

Solar multiple 1.3

Technical lifetime 20 years

Operation costs. Operation and maintenance costs are estimated to account for
approximately 1.5 % of the investment costs (Table 5.12).

Electricity generation costs. Table 5.12 also illustrates the resulting power genera-
tion costs. Due to the solar multiple of 1.3 (i.e. concentrator dimensions are suffi-
ciently large that nominal capacity is already reached at mean radiation) the full
load hours of the dish/Stirling system of 2,400 h/a are comparatively high in spite
of its design without storage. For the outlined reference system specific power
generation costs thus amount to 0.18 €/kWh, provided that the investment cost
reductions for the assumed 1,000 plants can be reached.

Table 5.12 Investments, operation and maintenance costs as well as power generation
costs of 10 kW dish/Stirling power plants
Investments
mirror, structure, drives and foundation 25,000 €
Stirling motor incl. receiver 11,000 €
transport, assembly and commissioning 4,000 €
planning, engineering, consulting, miscellaneous 6,000 €
contingencies 4,000 €
Total 50,000 €
Operation and maintenance costs 750 €/a
Power generation costs 0.18 €/kWh
As for tower and farm parabolic trough plants, power generation costs are
mainly influenced by the achievable number of full load hours, the investments
and the assumed mean interest rate.