Think I asked about something similar recently, but when is it best to start adapting your hills to windmills?
Right now it's fairly late game and I'm running Emancipation and Free Markets, so no massive boosts for workshops, watermills or windmills. Changing a mine to windmill will +1

, -2

, +2
Commerce and food wise it's obviously a good move, but won't those lost hammers be a nag? In short, would I be better off to convert all mines to windmills, perhaps except in the HE city?
Have noticed the AI builds windmills very early and aplenty, so perhaps that is why I'm reluctant
Same with watermills, should one build them basically everywhere it's possible by this stage, even though you're not able to run state property (due to corporations)?