  We report on low-energy electronic structure and electronic correlations of
K$_{0.65}$RhO$_2$, studied using high-resolution angle-resolved photoemission
spectroscopy (ARPES) technique and density functional theory (DFT)
calculations. We observe a highly correlated hole pocket on the Fermi surface.
We further notice that the correlations are momentum dependent. Most
importantly, two $kinks$ at binding energies of 75 meV and 195 meV have been
observed from the band dispersion in the vicinity of the Fermi level. While the
low energy $kink$ at 75 meV can be understood as a result of the
electron-phonon interaction, the presence of high energy $kink$ at 195 meV is
totally a new discovery of this system leading to an anomalous band
renormalization. Based on systematic analysis of our experimental data, we
propose high frequency bosonic excitations as a plausible origin of the high
energy anomaly. Further, we notice that the high energy anomaly has important
implications in obtaining the colossal thermoelectric power of
K$_{0.65}$RhO$_2$.
