1. A 1-kilowatt solar array called Phebus 1 was installed in France in 1992 and is still operational today. 2. After 31 years, the solar panels retain 79% of their original output, exceeding the usual 20-40 year lifespan and efficiency degradation expectations. 3. The solar system has produced 20,366 kWh for 882 Wp, averaging 745 kWh/kWp/year, and confirms scientific studies on solar panel degradation rates of 0.36 to 0.75% annually.