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This study investigates a novel hydroponic system integrating photovoltaic (PV) solar energy and treated greywater (System-II), compared to a grid-powered system (System-I). Key performance indicators, including energy consumption, energy efficiency indices, and CO<jats:sub>2<\/jats:sub> emissions, are evaluated for the two systems. Additionally, the morphological, physiological, and biochemical parameters of lettuce are measured. System-II achieved superior energy performance, with an energy ratio of 0.11, energy productivity of 0.16 kg\/MJ, and specific energy of 6.14 MJ\/kg, compared to System-I\u2019s 0.05, 0.07 kg\/MJ, and 14.89 MJ\/kg, respectively. Additionally, the water use efficiency values were 0.071 kg\/L for System-I and 0.073 kg\/L for System-II. Moreover, System-II reduced CO<jats:sub>2<\/jats:sub> emissions by over 94%, emitting only 0.0861 kg CO<jats:sub>2<\/jats:sub> eq\/m<jats:sup>2<\/jats:sup>, compared to 1.5386 kg CO<jats:sub>2<\/jats:sub> eq\/m<jats:sup>2<\/jats:sup> from System-I. Morphological and physiological traits of lettuce irrigated with treated greywater remained optimal, showing a mean head weight of 682.9 g, head length and diameter of 17.7 cm and 18.3 cm, relative water content of 93.5%, 5.4% dry matter, and total chlorophyll content of 1.023 mg\/g, comparable to those irrigated with tap water. This study highlights the potential of solar-powered hydroponics, utilizing treated greywater as a scalable and sustainable solution for efficient food production in alignment with WEFE nexus objectives. 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