Over the last decade and a half, battery storage went from being the core enabler of solar PV to a marginal technology. Battery-based systems now only represent around 1 percent of yearly solar installations in America and throughout the world.
“Sometimes people forget that storage was the roots of the solar industry,” said Kennedy.
But the industry is getting back to those roots and embracing storage once again. 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.