<![CDATA[Rooftop photovoltaic (PV) systems installed in working and educational facilities require data-based performance evaluation so that renewable energy contribution can be monitored and translated into operational actions. This study evaluates the production performance of the rooftop PV system at PLN UPDL Pandaan using operational data from 2024 to 2025. The method combines descriptive statistics, total yield, specific yield, year-on-year comparison, coefficient of variation, seasonal index, time series reading, and an initial battery energy storage system (BESS) scenario. The results show that annual total yield decreased from 11,332.73 kWh in 2024 to 10,520.48 kWh in 2025, equivalent to a 7.17% reduction. Specific yield also decreased from 1,365.39 kWh/kWp to 1,267.53 kWh/kWp, while the monthly coefficient of variation increased from 15.11% to 18.08%. Seasonal analysis indicates relatively high production in August and October, whereas January, February, November, and December tend to remain below the historical average. The BESS scenario shows that a 10 kWh nominal capacity can increase estimated PV utilization from 57.52% to 76.55% under the representative load profile. The findings support baseline-based operation and maintenance, monthly residual monitoring, and further continuous load measurement before implementation.]]>
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