That's mostly a separate issue… Hydro One is just a distributor, and one of many at that. Even if a future NDP government were to fully re-nationalize Hydro One, the province would still be facing exploding Global Adjustment costs due from the above-market costs paid out to power generators, and the many other schemes folded into the GA over the years.

The NDP might want you to believe that undoing the H1 sale will fix everything, but reality is much less rosy. I don't think any party has a good handle on how to solve this, least of all the Liberals.