http://www.eveningtribune.com/news/x1406679678/Solar-panels-soon-to-be-placed-at-Hornell-city-hall-water-treatment-plant
The $144,000 project, funded with a New York State Energy Research and Development Authority grant and a $16,000 local share, will see 10 kilowatt panels installed on city hall and 17 kilowatt panels placed by the treatment plant.
Combined, the two collections of panels will save the city over $2,000 annually.
That is an 80 year ROI on a 20 year life expectancy.