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flywheel energy storage

Yet another example of energy storage generated from intermittent sources.
This company has 3MW of storage installed and in use now.

"The constantly spinning flywheels perform frequency regulation services by speeding up and slowing down as they absorb and inject electricity from and to the grid. This helps keep the frequency of the alternating current (AC) at 60 cycles per second, and helps prevent grid instabilities from becoming costly regional outages.

Beacon’s flywheel systems also make it easier for the grid to integrate intermittent renewable energy sources, such as wind and solar power, whose variability increases the need for regulation."

full article here: http://www.renewableenergyworld.com/rea/news/article/2009/12/beacon-inte...