Abstract: The detection of astrophysical neutrinos with IceCube and solid predictions of the flux of cosmogenic neutrinos have renewed the interest in detecting neutrinos at 10^9 GeV. To date no experiment exists with sufficient sensitivity at these energies and thus the motivation for this study. I take a fresh look at the Earth-skimming technique in which a tau neutrino converts in the Earth's mantle and the decay products of the tau are detected with Cherenkov telescopes that monitor a large volume of atmosphere. In this talk I present a conceptual design study of an array of Cherenkov telescopes that is optimized for 10^9 GeV and has a sensitivity that is competitive with other proposed experiments.