  Black holes can accumulate a large amount of energy, responsible for highly
energetic astrophysical phenomena
  Recently, fast magnetic reconnection (MR) of the magnetic field was proposed
as a new way to extract energy and in this paper, we investigate this phenomena
in a bumblebee Kerr-Sen BH. We find that the presence of the charge parameter
strongly changes the simple Kerr case, making this extraction mechanism
possible even for not extremely rotating black holes ($a \sim 0.7$). We also
show that, under appropriate circumstances, MR is more efficient compared to
the Blandford-Znajek mechanism. We finally compare these results with
quintessence black-hole solutions not finding and enhancement respect to Kerr
solution.
