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Recent observations on Type-Ia supernovae and low density ($\Omega_{m} =0.3$) measurement of matter including dark matter suggest that the present-dayuniverse consists mainly of repulsive-gravity type `exotic matter' withnegative-pressure often said `dark energy' ($\Omega_{x} = 0.7$). But the natureof dark energy is mysterious and its puzzling questions, such as why, how,where and when about the dark energy, are intriguing. In the present paper theauthors attempt to answer these questions while making an effort to reveal thegenesis of dark energy and suggest that `the cosmological nuclear bindingenergy liberated during primordial nucleo-synthesis remains trapped for a longtime and then is released free which manifests itself as dark energy in theuniverse'. It is also explained why for dark energy the parameter $w = -{2/3}$. Noting that $ w = 1$ for stiff matter and $w = {1/3}$ for radiation; $w= - {2/3}$ is for dark energy because $"-1"$ is due to `deficiency ofstiff-nuclear-matter' and that this binding energy is ultimately released as`radiation' contributing $"+ {1/3}"$, making $w = -1 + {1/3} = - {2/3}$. Whendark energy is released free at $Z = 80$, $w = -{2/3}$. But as on present dayat $Z = 0$ when radiation strength has diminished to $\delta \to 0$, $w = -1 +\delta{1/3} = - 1$. This, thus almost solves the dark-energy mystery ofnegative pressure and repulsive-gravity. The proposed theory makes severalestimates /predictions which agree reasonably well with the astrophysicalconstraints and observations. Though there are many candidate-theories, theproposed model of this paper presents an entirely new approach (cosmologicalnuclear energy) as a possible candidate for dark energy.

Genesis of Dark Energy: Dark Energy as Consequence of Release and Two-stage Tracking Cosmological Nuclear Energy