Electrical conductivity (σ e ) in LLZO which has been linked to dendrite formation and growth ; thus a low σ e is essential for longterm cyclability. The electronic conductivity of tetragonal LLZO has also been investigated by first principles calculations by Squires et al. wherein it is suggested that the bulk electronic conductivity of the structure is too low for governing dendrite growth and attributes the dendrite growth to surface and defect contributions. Our calculations show that in doped LLZO, E F is trapped mid gap (∼ 2.5 eV above the VBM) and each transition level of the aliovalent dopants occurs far from the band edges (tabulated in SI Table ) thus no increase in conductivity is expected. Additionally, donor defects, such as Al(Ga)