Whenever I read about these bio power plants I wonder how this would scale. PV panels have no moving parts, they are just inert slabs on metal and minerals, mea

Whenever I read about these bio power plants I wonder how this would scale. PV panels have no moving parts, they are just inert slabs on metal and minerals, meant to run for decades with little maintenance. But these bio reactors are alive and require constant maintenance and, I presume, feeding to some extent.