Abstract: The Sudbury Neutrino Observatory (SNO) has demonstrated that the Standard Solar Model correctly predicts the total flux of active neutrino flavors produced by the Sun and that the suppression of electron neutrinos is consistent with matter-enhanced neutrino oscillations. Many theoretical models describing the behavior of solar neutrinos (such as the MSW effect, non-standard neutrino interactions and sterile neutrinos) predict spectral distortions between 2 to 5 MeV. Currently, only water Cherenkov detectors are capable of measuring the neutrino energy spectrum; a recoil-electron energy threshold of 5 MeV has long been considered the lowest reasonably achievable lower limit. I will discuss a new effort to lower SNO's energy threshold by as much as 1 MeV. Achieving this goal requires significant improvements in modeling the detector, determining the recoil-electron energy and removing backgrounds through new pattern recognition algorithms.