  Thermopower measurements have been carried out on the Ni substituted samples
of Na0.75CoO2 in the temperature range 4.2K to 300K. The room temperature TEP
increases by 20microV/K even with 1% Ni substitution and systematically
increases with increasing Ni content upto 5%. The increase in TEP is
accompanied by a decrease in rho, thus increasing the ratio of S^(2)/rho on Ni
substitution. At low T, the TEP shows an anomaly in the substituted samples,
showing a peak at T ~ 20K.
