<![CDATA[Indonesia has immense solar energy potential, with an average intensity of 4.8 kWh/m², equivalent to 112,000 GWp. However, only 10 MWp, or 0.08%, has been utilized. From an environmental perspective, rooftop solar power plants can significantly reduce CO₂ emissions. The tilt angle of solar modules influences both energy production and the performance ratio (PR). This study focuses on the impact of tilt and azimuth angles on energy output, PR, economic feasibility, and CO₂ emission reduction. Two scenarios are analyzed based on different angle combinations. A rooftop solar power plants system is considered technically feasible if the PR falls within the 75-80% range. Economic feasibility is assessed using methods such as Cost of Energy (COE), Net Present Value (NPV), Profitability Index (PI), Payback Period (PP), Internal Rate of Return (IRR), and Return on Investment (ROI) over a 30-year project period. Emission reductions are calculated using grid emission factors, assuming a 1% annual degradation rate for the PLTS. Scenario 1 produced 2,479,926 kWh with a PR of 87%, while Scenario 2 generated 2,474,835 kWh with a PR of 86.98%. Both scenarios are economically viable; however, Scenario 1 is more favorable, with a COE of Rp986.35/kWh, an NPV of Rp14,284,057,871, a PI of 1.52, a payback period of 12 years, 3 months, and 11 days, an IRR of 10.89%, and an ROI of 52.01%. Additionally, Scenario 1 achieved greater CO₂ emission reduction, totaling 54,224 tons over 30 years, compared to Scenario 2.Keywords : solar PV, angle variations, economic analysis, CO2 reduction]]>
