Perhaps stretch out a flow battery with a pair of pipelines? http://en.wikipedia.org/wiki/Flow_battery http://en.wikipedia.org/wiki/Flow_battery We could repur

Perhaps stretch out a flow battery with a pair of pipelines? http://en.wikipedia.org/wiki/Flow_battery http://en.wikipedia.org/wiki/Flow_battery We could repurpose those oil pipelines we no longer need. :-)