The slightly lower energy excitations that appear further in the NIR have been assigned to LSPR. It has also been shown that varying amounts of cesium occupation in the hexagonal crystal structure primarily impacts the extinction of the lower energy optical transitions, suggesting the cesium primarily contributes free electrons to the conduction band, amplifying the plasmonic absorption. Theoretical calculations of hexagonal tungsten oxide with varying occupation of the hexagonal channels with alkali metal cations is consistent with our theory. Those calculations indicate that cations occupying the hexagonal sites donate free electrons; in NCs these electrons would result in LSPR, as we observed. Machida et al. reported that varying oxygen content led to variation in the extinction of the material at higher energy. They hypothesized that the higher energy extinction was due to the increased oxygen vacancy concentration leading to an increased amount of polaronic states. This idea of different electronic states, associated with distinct charge compensating defects, leading to different optical absorption processes can correspondingly rationalize the cation-dependent electrochromic modulation spectra we observe.