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We examine the prospects for detecting supernova $\nu_e$ in JUNO, RENO-50,LENA, or other approved or proposed large liquid scintillator detectors. Themain detection channels for supernova $\nu_e$ in a liquid scintillator are itselastic scattering with electrons and its charged-current interaction with the$^{12}$C nucleus. In existing scintillator detectors, the numbers of eventsfrom these interactions are too small to be very useful. However, at the20-kton scale planned for the new detectors, these channels become powerfultools for probing the $\nu_e$ emission. We find that the $\nu_e$ spectrum canbe well measured, to better than $\sim 40\%$ precision for the total energy andbetter than $\sim 25\%$ precision for the average energy. This is adequate todistinguish even close average energies, e.g., 11 MeV and 14 MeV, which willtest the predictions of supernova models. In addition, it will help setconstraints on neutrino mixing effects in supernovae by testing non-thermalspectra. Without such large liquid scintillator detectors (or Super-Kamiokandewith added gadolinium, which has similar capabilities), supernova $\nu_e$ willbe measured poorly, holding back progress on understanding supernovae,neutrinos, and possible new physics.

New Power to Measure Supernova $\nu_e$ with Large Liquid Scintillator Detectors