Our waterways are becoming more and more polluted due to PFAS, plastics, medicines, drugs, and new chemicals made by companies that just hand over the responsibility of cleaning to plants paid for by public moneys. Detecting the different chemicals and filtering them out if getting harder and harder. Could the simple solution of heating up past a point where even PFAS/forever chemicals decomposes (400C for PFAS, 500C to be more sure about other stuff) be alright?
You’d have heat exchangers, like a desalination plant
https://en.m.wikipedia.org/wiki/Multi-stage_flash_distillation
So still impossible, but not unfathomable
edit:
122,060,000,000 kWh becomes
003,500,000,000 kWh
About a third of the national capacity