  We demonstrate that long-ranged terrestrial electric fields can be used to
exclude or discover ultralight bosonic particles with extremely small charge,
beyond that probed by astrophysics. Bound condensates of scalar millicharged
particles can be rapidly produced near electrostatic generators or in the
atmosphere. If such particles directly couple to the photon, they quickly short
out such electrical activity. Instead, for interactions mediated by a
kinetically-mixed dark photon, the effects of this condensate are suppressed
depending on the size of the kinetic mixing, but may still be directly detected
with precision electromagnetic sensors. Analogous condensates can also develop
in other theories involving new long-ranged forces, such as those coupled to
baryon and lepton number.
