I would presume that the idea is to get the state and the cities out of the power business, which they had no business getting into in the first place.
The bill says that they should be sold in the best interests of the state. Presumably that means a) get rid of costly facilities; and b) get the best price for them.
Presumably the wording is intended to avoid costly and time-consuming bidding processes, which can go on for years. As long as the properties are put up for sale in such a way that they get the best reasonable bids for them, that should suffice.
That’s just my guess. But often the “bidding process” can be time consuming, wasteful, and actually end up not getting the highest bids anyway. Better to put someone responsible in charge and let him use his best judgment.