  We consider a self-consistent system of Bianchi type-I (BI) gravitational
field and a binary mixture of perfect fluid and dark energy. The perfect fluid
is taken to be the one obeying the usual equation of state, i.e., $p = \zeta
\ve$, with $\zeta \in [0, 1]$ whereas, the dark energy density is considered to
be either the quintessence or the Chaplygin gas. Exact solutions to the
corresponding Einstein equations are obtained.
