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...
[1] https://en.wikipedia.org/wiki/Diablo_Canyon_Power_Plant#Clos...
https://www.waterboards.ca.gov/water_issues/programs/ocean/c...
These days you can buy a lot of solar, wind, and storage for $2.6B, so I'm not sure that closing the reactor is merely "not liking" nuclear. At this point we get more carbon free energy from solar and storage for the same amount of money, so if one is concerned about carbon it makes more sense to chug it down and build newer cheaper infrastructure.
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.