[dredmorbius]

That's an option.

With geothermal, though, you don't actually want to run flat-out all the time, as the geothermal reservoir does require time to recover, whether that's groundwater refresh or heating up after a period of high generation which extracts heat faster than it is transmitted through surrounding rock (most cases) or magma (not yet a major utilisation mode).

Soaking up excess generating capacity through interruptable heavy loads is somewhat better suited to wind or solar. If you have a task you can divert electricity that will be generated anyway to, so much the better. That's what pumped-hydro, desalination, grid-scale battery banks, or fuel synthesis represent.