  A locally conformally product (LCP) structure on a compact conformal manifold
is a closed non-exact Weyl connection (i.e.~a linear connection which is
locally but not globally the Levi-Civita connection of Riemannian metrics in
the conformal class), with reducible holonomy. A left-invariant LCP structure
on a compact quotient $\Gamma\backslash G$ of a simply connected Riemannian Lie
group $(G,g)$ with Lie algebra $\mathfrak{g}$ can be characterized in terms of
a closed 1-form $\theta\in\mathfrak{g}^*$ and a non-zero subspace
$\mathfrak{u}\subset \mathfrak{g}$ satisfying some algebraic conditions. We
show that these conditions are equivalent to the fact that $\mathfrak{g}$ is
isomorphic to a semidirect product of a non-unimodular Lie algebra acting on an
abelian one by a conformal representation. This extends to the general case
previous results holding for solvmanifolds. In addition, we construct explicit
examples of compact LCP manifolds which are not solvmanifolds.
