Earlier quoted context omitted.
Their only remaining nuclear generation station is being closed down early because people in California don't like it regardless of its reliable carbon-free energy [1]. [1] https://en.wikipedia.org/wiki/Diablo_Canyon_Power_Plant#Clos...
Weird, I thought that Wikipedia page used to cite the costs of retrofitting Diablo Canyon's cooling to move away from once through water, but I don't see it there anymore. The history of that page shows scars of manipulating the narrative, but I stil didn't find it. Here's a PDF from PG&E that puts the cost at $2.6B: https://www.waterboards.ca.gov/water_issues/programs/ocean/c... These days you can buy a lot of solar…
The only other methods I am aware of are the giant cooling towers people associate with nuclear plants or ponds (more like canals which snake back and forth, see Turkey Point in Florida) which allow the water to cool before reuse.