This battery is obviously not for shock winters since capacity falls in cold weather. When i first saw the title i pictured in my mind a titanic model y rolling through the rural areas of texas...
(oh)
No seriously: this isn't a problem. Heated buildings are solved, large ones stay warm for days once power is cut. There's a surprising amount of thermal mass in something that large, building walls are thicker, more simply constructed and easier to insulate than wood houses, and the mass to surface ratio is much smaller than what you're used to in a home. And in any case the waste heat produced by generation at that capacity is more than enough to keep an active facility warm, they most likely need to engineer for net cooling even during the coldest weather.