<div dir="auto">Here is a large scale battery based on the differences in cost of electricity between high and low periods of demand.  Right here in Massachusetts!</div><div dir="auto"><br></div><div dir="auto">— Harry<br><br><br><a href="https://www.wbur.org/news/2016/12/02/northfield-mountain-hydroelectric-station">https://www.wbur.org/news/2016/12/02/northfield-mountain-hydroelectric-station</a><br></div>