Battery-based systems only represent about 1% of annual photovoltaic installations in the U.S. and around the world, but solar’s roots are still in off-grid storage. Now, “the industry is getting back to those roots and embracing storage once again,” Lacey writes in this feature report. “As lithium-ion batteries get cheaper and more abundant, solar penetration reaches high enough levels to worry utilities, and electricity markets evolve to reward storage, attention has suddenly turned back to batteries.” This time around, the impetus is “coming from technology pioneers in Silicon Valley and savvy industry veterans who see it as the next big business opportunity.”
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