Found some sources. Closer to $50 million than $90 million, and these imply that Caesar's didn't have as much of a choice in it as in the source I first read (but can't find).

https://www.reviewjournal.com/business/energy/caesars-to-pay...

https://lasvegassun.com/news/2017/mar/08/puc-approves-475-mi...