That’s a good question, actually so I looked it up and found a few articles talking about it.
“At full capacity, the Klamath River dams can produce enough electricity to power about 70,000 homes, though in reality, they produce about half that, says PacifiCorp spokesperson Bob Gravely. The reservoirs do not provide drinking or irrigation water.” Source
As for what the electricity would be replaced with, it would be from other sources that would are aggregated by the power company.
I actually think the research for this dam removal was done quite thoroughly after reading this article: [https://storymaps.arcgis.com/stories/a69884b685ef49bbba26f9a1d377cbe4](Link here)
Someone crunched the numbers and the dams were not efficient, aging and getting to be a liability so I believe the removal was an overall net positive
ah my formatting didn’t work :'(