2018 may have been the year of residential energy storage, according to a leading analyst, but grid storage was no slouch.

2018 was also the year that grid-level batteries broke out of early adopter states, said Dan Finn-Foley, a senior analyst with Wood Mackenzie Power & Renewables, and began appearing in places that might once have seemed unlikely.

“This isn’t just a Starbucks in California talking about energy storage,” Finn-Foley said Thursday. “We have Alabama, this past quarter Georgia, the Carolinas talking about energy storage. This tells you this is about cost. This is not an emotional decision. This is now about finding the least-cost solution, as a utility, to customers. And that’s a big deal,” he said, according to Forbes.

“If you can tell a utility this is your least-cost solution, your market is about to take off, and that’s exactly what’s going to happen for front-of-the-meter energy storage.”

Wood Mackenzie has not yet released its report on 2018, but Finn-Foley offered a sneak preview to Clean Energy States Alliance members Thursday, telling them that the fourth quarter of 2018 broke energy-storage records everywhere.