Yes, it is quite possible. Urine contains organic matter, which can be converted into energy. Better yet, the process kills pathogens in the urine water, sanitizing it.
https://www.sciencealert.com/tech-that-turns-urine-into-electricity-can-also-kill-pathogens-in-wastewater

Turning Urine Into Electricity Can Also Kill Pathogens in Wastewater

Link: https://www.sciencealert.com/tec

Fuel cells with microorganisms that feed on pee and generate electricity already sound like a pretty clever trick.