  The high-throughput calculation predicts that the Fe-based cubic ferromagnet
Fe$_3$Si may exhibit a large anomalous Nernst effect (ANE). Here, we report our
experimental observation of the large Nernst coefficient $S_{yx}\sim$2 $\mu$V/K
and the transverse thermoelectric coefficient $-\alpha_{yx}$ $\sim$ 3
Am$^{-1}$K$^{-1}$ for Fe$_3$Si polycrystal at room temperature. The large
$-\alpha_{yx}$ indicates that the large ANE originates from the intrinsic Berry
curvature mechanism. The high Curie temperature of 840 K and the most abundant
raw elements of Fe and Si make Fe$_3$Si a competitive candidate for Nernst
thermoelectric generations.
