The
ETI
support
will
allow
Isentropic
to
build
a
full-scale,
grid-connected
demonstrator
of
its
pumped-heat
electricity
storage
(PHES)
device.
The
1.5MW/6MWh
PHES
system
will
be
wired
into
a
substation
owned
by
Western
Power
Distribution
in
the
English
Midlands.
It
could
be
rolled
out
to
some
5,000
substations
across
the
UK.
The
PHES
is
made
up
of
two
gravel-filled,
steel
“silos”
that
store
and
release
energy
using
argon
gas
circulated
by
an
electric
motor.
The
gas
is
compressed
in
one
insulated
silo
to
reach
500°C,
before
being
pumped
into
the
other
unit
where
it
cools…
