The Plan to Store Wind Energy In Giant Underwater Air BubblesSarah Zhang7/15/14 4:02pmFiled to: energywindwind energywind farmsunderwaterocean524EditPromoteShare to KinjaToggle Conversation toolsGo to permalinkWeather is annoyingly fickle, and so is the wind. If massive offshore wind farms are going to become reality, we need better ways to store the extra energy from windy days for the windless ones. One a bizarre-sounding idea floating around: giant balloons of compressed air stored deep underwater. Like many good ideas, the seeds of compressed-air energy storage, or CAES, were sowed long ago, in the 1870s. Today, a handful of operations store energy as compressed air in sealed-off caves or pipe systems. But that's all on land. Bringing CAES deep underwater, where water pressure naturally keeps air compressed, is a novel and tantalizing idea for the massive offshore wind farms of the future.