Siemens 2012 Annual Report Download - page 53

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, 
The town of Vellinge, in southern Sweden, has imple-
mented a self-financing energy modernization project
for its municipal properties. Thanks to our advanced
building technology systems, energy consumption and
costs for the town’s administrative buildings, schools,
retirement homes and public swimming pools have
been slashed. Under our energy-saving performance
contracting model, we covered all upfront costs. The
community of Vellinge will pay for the modernization
through contractually guaranteed energy cost savings
within the next few years.
Offering intelligent
financing solutions
€
, 
It’s a promising solution for storing electricity generated
by wind and solar power: electrolysis is used to split
water into oxygen and hydrogen. The hydrogen is then
stored and later used to power vehicles and turbines or
for applications in industrial processes. A test unit with
a peak power rating of . megawatts produces two
to six kilograms of hydrogen an hour. When electricity
from renewable sources is used for electrolysis, hydrogen
production is virtually climate-neutral. The next gen-
eration of electrolyzers, which will have a rated power
of two megawatts, is expected to be ready for use in
the medium term. Researchers are aiming to develop
an electrolyzer that has up to a triple-digit-megawatt
maximum power rating and can accommodate the
surplus energy generated by a large wind farm.
Developing and expanding
energy storage facilities
H
Electrolyzers
Hydrogen as storage medium
Technology under development
Storing wind and solar power
in the form of hydrogen
For example, using hydrogen
to power fuel-cell vehicles
ern link HVDC connection
Length  km Voltage  kV
Output , MW
Project completion 
Energy performance contracting
Energy savings of
, MWh / year
Self-financing energy-saving
performance contract

European Energy Service Award
CO emissions cut by
, tons / year