This study was conducted to evaluate the performance of solar energy production system by adopting super hydrophilic nano-coating agent for improving energy self-sufficiency in municipal wastewater treatment plants(WWTPs). SKT3 and SKG was tested as super hydrophilic nano-coating agent. As the results, the power generation efficiency was increased by super hydrophilic coating on photovoltaic module. Though the performance of power generation is decreased by lapse of time and higher insolation(more than 600W/m2) conditions, It is expected that the average power generation will be increase more than 5% by adopting super hydrophilic nano-coating agent such as SKG.