I also would have guessed that.

Then the article throws this monkey wrench into it

>Upon activation, Crimson Storage became the largest active single-phase storage project in the world, and second-largest energy storage project currently in operation of any configuration

It doesnt make any sense. Probably it means the battery is one DC battery unit which converts to 3 phase AC, instead of 3 battery units, one for each phase. Idk.