The energy colour used to be visible on the 'skirt' of the Astrea TennoGen skin but isn't anymore since one of the secondary energy colour patches. If you look at the screenshot, the 'folds' or bass-relief lines on the blue coloured skirtĀ used to have the (then primary) energy colour but now don't show any colour at all, they just take on the tertiary colour that is applied to the entire skirt (blue in this image).