At
the
beginning
of
last
year,
seven
solar-energy
companies
were
listed
on
the
TecDAX,
an
index
tracking
the
30
largest
technology
companies
on
the
Frankfurt
stock
exchange.
Today,
there
are
two.
The
survivors
are
SolarWorld
and
inverter
maker
SMA
Solar.
All
the
others
—
Q-Cells,
Phoenix
Solar,
Conergy,
Roth
&
Rau
and,
most
recently,
Centrotherm
—
have
been
delisted
as
their
market
capitalisations
withered
or
they
were
acquired
or
went
bankrupt.
Germany’s
old
guard
of
solar
companies
—
exalted
not
so
long
ago
for
symbolising
a
“future-proof”
industry
—
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