  Low-energy high-resolution neutrino-electron scattering experiments may play
an important role in testing the gauge structure of the electroweak
interaction. We propose the use of radioactive neutrino sources (e.g.
$^{51}$Cr) in underground experiments such as BOREXINO and HELLAZ as a probe of
the weak neutral current structure. As an illustration, we display the
sensitivity of these detectors in testing the possible existence of
right-handed weak neutral currents.
