In 2021, the Grohnde nuclear power plant in Lower Saxony on the Weser River was shut down. Now, immediately next to it, the Emmerthal energy cluster is growing with three very large battery storage systems, ground-mounted photovoltaic systems, and a new substation for several 380-kilovolt high-voltage lines.
They can quickly and easily be torn down by explosives (video). In fact, they are huge but not that massive.
And concrete can be re-used which saves carbon. With new technology (combination with electric blast furnaces), the cement can even be recycled, saving even more carbon. Which is huge, since it is a very important but extremely carbon-intensive material.