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Figure 9. LCOE of different power plants without environmental cost
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Figure 10. LCOE of different power plants by considering environmental cost
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Figure 11. Specific consumption of natural gas
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Figure 12. CO2 emission of different power plants
CONCLUSION
ISCCS plant coupled with PTC has shown that during daytime the solar energy could be converted at a solar electricity ratio about 17 % while the plant thermal efficiency may reach more than 63 % which is higher than in CC. On the other hand, when considering the environmental cost, LCOE of ISCC is equal to 0.0272 $/kWh which is about 20 % higher than CC. The annual solar contribution of ISCC results in fuel consumption about 140 kg/MWh which is about 7 % lower than CC, but allows saving about 18.45 million $ of fuel through 30 years of operation. Moreover, CO2 emission is lowered by reducing 0.89 million ton rejected over 30 years. The integration of fossil fuel – natural gas with solar energy for the replacement of the latent heat by using HSSG in parallel with HRSG is a very attractive option to make the transition from simple the GT and CC to the ISCC power plants. The results obtained concur well the feasibility and benefits of integrating the solar technology. Despite the current costs of PTC parts, it seems that their integration of CRS could be a promising option to be considered in the Algerian program aimed to produce 22000 MWe from the renewable energy.