The electronic conductivity of Sr(3-3x)La(2x)square(x)(VO4)(2) solid solutions was measured at oxygen pressures from 10(-13) to 10(5) Pa and temperatures from 1070 to 1270 K, and their band gap was determined as a function of composition. The activation energy (similar or equal to 2.85 eV) and enthalpies of electron generation (similar or equal to 4.2 eV) and migration (similar or equal to 0.75 eV) were determined. A correlation between the band gap and electronic conductivity of the solid solutions was revealed.