  States of Low Energy (SLE) are exact Hadamard states defined on arbitrary
Friedmann-Lema\^{i}tre spacetimes. They are constructed from a fiducial state
by minimizing the Hamiltonian's expectation value after averaging with a
temporal window function. We show the SLE to be expressible solely in terms of
the (state independent) commutator function. They also admit a convergent
series expansion in powers of the spatial momentum, both for massive and for
massless theories. In the massless case the leading infrared behavior is found
to be Minkowski-like for all scale factors. This provides a new cure for the
infrared divergences in Friedmann-Lema\^{i}tre spacetimes with accelerated
expansion. In consequence, massless SLE are viable candidates for
pre-inflationary vacua and in a soluble model are shown to entail a
qualitatively correct primordial power spectrum.
