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“This is why I give courses,” he said.
According to Krueger
medium-sized battery banks
will play an important role
in megacities; e.g. for emergency cases as backup power
for large hospitals or airports
or for load leveling and peak
“You can install them
near large consumers or
critical infrastructures,” he
said, explaining that suit-
able topology and height
variation are necessary for
pumped storage, which can
complicate permitting. That
said, there are other innovative cases where smaller forms of
pumped hydro and other renewable energy sources can pair
together nicely. He pointed to Gaildorf, Germany where the frst
wind/pumped storage hybrid power plant in the world is under
construction. The project uses the wind farms’ four towers and
bases as water reservoirs and three reversible Francis machines
with a total capacity of 16 MW for generation.
If there is a surplus of power, the pumped storage power station switches to pumping mode moving water from a lower reservoir to the higher storage basin in the wind towers. If the
demand for electricity in the grid rises, water is released from
the upper basin to the bottom via a penstock and causes the
pump turbines to generate. Within seconds, electricity is fed
back into the grid.
Today there is no “one-size-fts-all” long-duration energy storage solution and Krueger believes there probably never will be.
“You will fnd everything coexisting,” he said. “Utilities will
need to consider each project and evaluate the correct solution.” à