Obviously, but that doesn't mean plants can't be designed to accumulate energy during the day though photosynthesis and release it at night in form of bioluminescence. There's actually a whole separate line of research regarding that:

• https://www.moeveglobal.com/en/planet-energy/sustainable-innovation/bioelectricity-plants-renewable-energy
• https://www.snexplores.org/article/tree-cellulose-lignin-batteries-energy-storage-green-technology-forests