  The MOLLER experiment will measure the weak charge of the electron, $Q^e_W =
1 - 4\sin^2\theta_W$, with a precision of 2.3% by measuring the
parity-violating asymmetry in electron-electron (M\oller) scattering. This
measurement will provide an ultra-precise measurement of the weak mixing angle,
$\sin^2\theta_W$, which is on par with the two most precise collider
measurements at the Z$^0$-pole. The precision of the experiment, with a
fractional accuracy in the determination of $\sin^2\theta_W$ $\approx 0.1$%,
makes it a probe of physics beyond the Standard Model with sensitivities to
mass scales of new physics up to 7.5 TeV.
