  We report a new result of the temperature-dependent average energy expended
per electron-hole (e-h) pair, $\varepsilon$, for germanium detectors. Applying
energy partition mechanism in ionization for a given energy deposition, the
Fano factor and the value of $\varepsilon$ can be determined separately.
Subsequently, we illustrate the variation of $\varepsilon$ as a function of
temperature. The impact of $\varepsilon$ on the energy threshold and energy
scale for germanium detectors at a given temperature is evaluated. We
demonstrate an absolute energy scale function of low-energy recoils for
germanium detectors in the direct detection of dark matter particles.
