The map below displays three different tools that can be used to show a 20 mile radius around the community colleges in Massachusetts. The three different tools are the geoprocessing buffer tool, the Euclidean distance tool, and Network Analyst. Take a look!

This a link to a web application I made for the viewshed of a 400 foot wind turbine on Mount Tom.
http://www.arcgis.com/apps/OnePane/azuretwitter/index.html?appid=62a32edf36cd44fcbbf98bc057771dc9

Here is the Viewshed for a 400 foot wind turbine placed on the highest point(365 meters) on Mount Tom in Holyoke, Massachusetts. Displayed is also Easthampton and Southampton.

Suppose we wanted figure out where on Mount Tom, in Holyoke, Massachusetts would be a suitable place for a wind turbine. How would we go about doing it? This document contains the procedure of analysis, a table with data layers, a table with the main geoprocessing tools used, as well as documentation of the work. This analysis is done in Arcmap. https://docs.google.com/document/d/1sGUq3TaRUpW9VdRt9shV_OctlMtnXJMRnxMtodXuTtI/edit?usp=sharing

Here are two Google Earth maps of Adams and Otis. The polygons are all of the locations in both towns suitable to the three criteria for a solar-wind farm. The three criteria were: The site has to have a slope angle of 20 degrees or less, or flat, the slope has to have a southerly aspect of 135 to 225 degrees, and the wind speed at 30 meters has to be above 5 meters per second.

Here is a raster analysis of the BGEC Solar-Wind Farms using ArcGIS Online. 

http://www.arcgis.com/apps/OnePane/azuretwitter/index.html?appid=2b45be364fad43f5948f610ae2c64a8f

Suppose the Berkshire Green Energy  Committee (BGEC) wanted to know locations meeting all criteria for  combined solar and wind farms . . . what would that map look like??? Well this map below shows all of the suitable locations in the Berkshire County towns of Adams and Otis, Massachusetts. Take a look!