Taxpayers aren’t “underwriting” anything - the article doesn’t indicate that this business received anything from taxpayers. They just kept more of their own money.
You are free to show me that this plant stands on it's own two feet with no subsidies, but I doubt it. In any case it raises rates.
I haven't said any of that. But if that plant was "fossil fuel" it would provide cheaper power, and tax revenue. Forcing me to use inefficient power to assuage some lefty politicians "global warming" guilt is a "cost".