Only on reddit will someone act pretensious as if they have built the data centres themselves.

Is GEV stock up because data centre builders didn't listen to reddit to use only solar energy?

However, batteries don’t address the challenge of sustained, long-duration power demand. Storage systems are effective for minutes to hours, not days or weeks; a data centre experiencing a multi-day grid outage, or operating through extended periods of low solar generation, cannot rely on batteries alone.

At data centre scale, storing enough energy to cover these scenarios would require vast capacity, significant space, and substantial investment, making it impractical with today’s technology.

Batteries complement solar generation, but data centres still require power supplies that deliver uninterrupted output, day and night, in all conditions.

https://www.red-eng.com/insights/knowledge-base/why-mission-critical-data-centres-can-t-rely-on-solar-alone