Yea but like parts of the PNW are >50% hydro too (Seattle is >80%), but they still haven't ever closed the gap to 100% for any significant length of time.
that last 2% is going to take a lot of work to replace, but I'd be surprised to see it backslide.
[1] https://www.bchydro.com/content/dam/BCHydro/customer-portal/...
https://app.electricitymaps.com/map reports Seattle City Light as 100% hydro, fwiw.