The tax credits for residential renewable energy products are still available through December 31, 2021. Renewable energy tax credits for fuel cells, small wind turbines, and geothermal heat pumps now feature a gradual step down in the credit value, the same as those for solar energy systems. Use up to 30% less energy in your home by outfitting it with ENERGY STAR certified products, available across more than 75 categories. ENERGY STAR-certified products are independently certified to save energy, save money and protect the environment.