The three systems are predicted to have very similar Seebeck coefficients, but the conductivities, power factors and electrical thermal conductivities fall in the order of STO > CTO > BTO. Our calculations predict a maximum PF around 1 mW m -1 K -1 for STO with n ≈ 10 21 cm -3 and T = 1000 K, and under these conditions the κ el is on the order of 0.5 W m -1 K -1 . Conversely, the low σ of BTO results in a maximum PF of 0.3 mW m -1 K -1 . Comparing the scattering rates of the three materials at n = 10 21 cm -3 and T = 1000 K (Figs S4-S6, ESI † ) indicates that the low σ of BTO is due to the impact of PIE scattering on the electron relaxation times -this mechanism is only possible on the noncentrosymmetric R3m spacegroup and indicates that the B-site cation off-centering may be detrimental to the electrical transport.