From the article: “Three years ago you almost never saw batteries as part of a new solar or wind project,” Naam said. “In 2018, we’ve seen battery storage freq

From the article: “Three years ago you almost never saw batteries as part of a new solar or wind project,” Naam said. “In 2018, we’ve seen battery storage frequently show up as part of these bids. Energy storage is becoming the new normal with solar bids.” So they are already working on it with some of the projects at least, and there's no reason to think they won't scale up and start becoming competitive before too long.