  We complete the computation of the 1-loop (alpha_s^2) corrections to hard
spectator scattering in non-leptonic B decays at leading power in Lambda/m_b by
evaluating the penguin amplitudes. This extends the knowledge of these
next-to-next-to-leading-order contributions in the QCD factorization formula
for B decays to a much wider class of final states, including all
pseudoscalar-pseudoscalar, pseudoscalar-vector, and longitudinally polarized
vector-vector final states, except final states with eta or eta' mesons. The
new 1-loop correction is significant for the colour-suppressed amplitudes, but
turns out to be strongly suppressed for the leading QCD penguin amplitude
alpha_4^p. We provide numerical values of the phenomenological P/T and C/T
amplitude ratios for the pi pi, pi rho and rho rho final states, and discuss
corrections to several relations between electroweak penguin and tree
amplitudes.
