  This paper discusses recently proposed Higgs Energy LEptoN (HELEN) $e+e-$
linear collider based on advances in superconducting radio frequency
technology. The collider offers cost and AC power savings, smaller footprint
(relative to the ILC), and could be built at Fermilab with an interaction
region within the site boundaries. After the initial physics run at 250 GeV,
the collider could be upgraded either to higher luminosity or to higher (up to
500 GeV) energies.
