The town of Royalton has posted online the power bills for the primary facilities (the town hall and highway garage) to show what the payments were pre-windmills and what they are now with windmills in operation:
http://townofroyalton.org/content/MinuteCategories/View/9:field=minutes;/content/Minutes/View/233
http://townofroyalton.org/content/MinuteCategories/View/9:field=minutes;/content/Minutes/View/233
