I know that in a semiconductor in thermal equilibrium generation and recombination are equivalent. This is obvious from continuity equation since in thermal equilibrium there is no time derivatives nor spatial gradients. However, I have read that in "stationary state" generation and recombination are also equivalent. That does not have sense to me. You do not have time derivatives but you keep space gradients and it is possible to have a current to compensate for the difference in generation and recombination rates. Is there something that I am not understanding well?