  We present the first hydrodynamic N-body simulations of primordial gas clouds
responsible for the reionisation process in dark energy cosmologies. We compare
the cosmological constant scenario with a SUGRA quintessence model with marked
dynamics in order to highlight effects due to the different acceleration
histories imposed by the dark energy. We show that both the number density of
gas clouds and their clumpiness keep a record of the expansion rate during
evolution, similar to the non-linear dark matter profile at virialisation, as
was recently demonstrated by Dolag et al. (2004). Varying the shape of the
primordial power spectrum, we show how this effect is mitigated by a running
spectral index decreasing the power at small scales. Our results demonstrate
that, in order to constrain the dark energy from large scale structures, one
must track its effects down to the distribution of luminous matter.
