You can qualify for the ITC for the tax year in which you installed solar panels as long as the system produces electricity for the home in the United States. In 2021, ITC will provide a tax credit of 26% for systems installed between 2020 and 2022 and 22% for systems installed in 2023.Is there an energy tax credit for 2021. Tax credits for energy efficiency of housing have now been extended retroactively, until 31 December 2021. ... Tax credits for renewable energy for fuel cells, small wind turbines and geothermal heat pumps now have a gradual decline in value loans, just like those for solar energy systems.