  We calculate the electrical conductivity in the early universe at
temperatures below as well as above the electroweak vacuum scale, $T_c\simeq
100$GeV. Debye and dynamical screening of electric and magnetic interactions
leads to a finite conductivity, $\sigma_{el}\sim T/\alpha\ln(1/\alpha)$, at
temperatures well below $T_c$. At temperatures above, $W^\pm$ charge-exchange
processes -- analogous to color exchange through gluons in QCD -- effectively
stop left-handed charged leptons. However, right-handed leptons can carry
current, resulting in $\sigma_{el}/T$ being only a factor $\sim \cos^4\theta_W$
smaller than at temperatures below $T_c$.
