Hi Ahmed,
The capital cost is determined by the inputs on the System Costs page plus any additional costs on the Financial Parameters page.
It is up to you to make sure these costs are appropriate for your analysis, and to verify that the resulting Year 0 costs in the project cash flow (see the Cash Flow tab on the Results page) are appropriate.
The NREL Annual Technology Baseline (ATB) is one source of market data on costs:
atb.nrel.gov/electricity/2023/technologies
Best regards,
Paul.