  We consider work extraction from $N$ copies of a quantum system. When the
same work-extraction process is implemented on each copy, the relative size of
fluctuations is expected to decay as $1/\sqrt{N}$. Here, we consider protocols
where the copies can be processed collectively, and show that in this case work
fluctuations can disappear exponentially fast in $N$. As a consequence, a
considerable proportion of the average extractable work $\mathcal{W}$ can be
obtained almost deterministically by globally processing a few copies of the
state. This is derived in the two canonical scenarios for work extraction: (i)
in thermally isolated systems, where $\mathcal{W}$ corresponds to the energy
difference between initial and passive states, known as the ergotropy, and (ii)
in the presence of a thermal bath, where $\mathcal{W}$ is given by the free
energy difference between initial and thermal states.
