As the efficiency of renewable energy systems improve and the costs continue to decline, they are becoming an increasing attractive investment capable of saving significant money. Most solar electric systems last 40+ years, solar thermal systems last 30+ years, and wind systems typically last 25 to 30 years. So once you recover your initial investment, you can realize substantial savings in energy costs over the life of a system.
When available, State grants and Federal tax incentives can offset 40% to 60% of a residential system’s cost. For commercial and farm systems, the offset can be much larger due to the Federal tax incentives, often more than 90% of the system cost. See the below presentation for details and examples of each type of system.