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[eds]

"We always called it the 'holy grail,'
. . . because we knew too much wind and solar,
. . . would break the grid without energy storage,
. . . but we thought it would always be too expensive."

The current capital cost for storage, which was
. . . $1,000/kWh in 2012, is estimated as low as
. . . $200/kWh, according to a study from the
. . . National Renewable Energy Laboratory (NREL).

6-1-2018 Source:  Batteries: and #Wind