According
to
UK
National
Grid
figures,
the
UK
will
need
8GW
of
capacity
by
2025
if
the
penetration
of
wind
power
in
the
network
reaches
30%.
It
currently
has
2.8GW
of
capacity
in
the
form
of
pumped
hydro
storage.
“As
the
UK
ramps
up
its
dependence
on
power
generation
from
intermittent
renewable
energy
sources,
like
the
wind,
the
need
to
develop
electricity
storage
technologies
becomes
ever
more
pressing,”
says
Tim
Fox,
head
of
energy
and
environment
at
the
Institution
of
Mechanical
Engineers
(IMechE).
“For
too
long
we’ve
been
reliant
on
using
expensive
‘back-up’…
