Our wind program is not savings, while the wind blows for free, the equipment and maintenance cost is more expensive than the cost of dirty energy like coal and natural gas. While the cost of clean energy has fallen drastically over the past it is still more expensive per kWh.
In order to say that you're using renewable energy, you must purchase both physical electrons as well as corresponding Renewable Energy Certificates (RECs). Those two things together are what make up renewable energy.
When you join Arcadia Power, your utility continues to provide the electrons and your monthly wind energy fee covers the cost of RECs.
Here is a great EPA video that explains how it works: