Giant Batteries Helped the U.S. Power Grid Eke Through Summer

By .css-nyr2iw-AuthorContainer{white-space:nowrap;}.css-tuctgt-AuthorLink{color:var(–interactive-text-color);font-style:var(–font-style-italic);}.css-tuctgt-AuthorLink:hover{-webkit-text-decoration:none;text-decoration:none;}Jennifer Hiller.css-kx7fw8-FollowButton{display:inline;margin:0 8px;}.css-kx7fw8-FollowButton ufc-follow-author-widget:not(.hydrated){display:inline-block;width:60px;}.css-195ai1w-UnItalicizePipe{font-style:var(–font-style-normal);}| Photographs by Jake Dockins for The Wall Street Journal This post first appeared on wsj.com