The top of this German article [1] has a rendering of a planned 1.4GW power, 6GWh storage battery plant, with the decommissioned nuclear plant in the background. The battery energy storage is a bit smaller in area and of course of lot less tall. Eyeballing, the area is actually very comparable if you deduct the power plant's parking lot. The nuclear plant is Grohnde, a 1.43GW single-reactor plant.

The similar power output is not a coincidence. The biggest bottleneck for new solar and battery storage plants in Germany is getting them connected to the grid, and the freshly decommissioned nuclear plant has a great grid connection that this project wants to reuse

1: https://www.heise.de/news/Mehr-als-1-4-Gigawatt-Riesige-Batt...