The study conducts performance evaluation of a 5 MWp grid-connected solar photovoltaic (PV) power plant commissioned by NTPC Limited in Dadri, India. The plant is among the earliest large-scale solar power installations in India, established in 2013, under Phase I of the Jawaharlal Nehru National Solar Mission. The plant site receives an annual average solar irradiation of 4.59 kWh/m2/day and experiences an annual mean temperature of approximately 25.13 °C. This study thoroughly assesses the operational performance of the plant, considering both controllable and non-controllable factors influencing the plant operation, using data monitored during the financial year 2022–23. This is a pioneering study assessing the performance of a national grid-connected, megawatt scale solar power plant in India that has completed a decade of operation. The evaluation was carried out in accordance with IEC 61724 standard guidelines for performance evaluation supplemented by analysis of relevant secondary research literature. Based on an annual average reference yield of 4.59 h/day, the array yield and final yield were determined to be 3.62 h/day and 3.29 h/day, respectively. The findings reveal that annual performance ratio of the solar power plant stands at approximately 0.72 with an average annual gross AC energy production of 6282.78 MWh. PVsyst simulations were also performed to validate the observed results, identify deviations, and analyze key performance parameters. The findings indicate that the measured performance closely aligns with PVsyst simulation outcomes, albeit with potential for further improvement. The study underscores the importance of accurate solar insolation estimation in the design and performance forecasting of solar PV plants. Despite some practical constraints related to data continuity, data logging practices, and PV module representation in the simulations, the insights derived from this study not only contributes to the broader discourse on the efficient integration of solar energy into the national grid for optimum results but also offer practical implications for policy makers, energy sector researchers and investors for future solar PV deployments in India and global South countries striving towards a sustainable energy future.
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