Hi Georgia75,
If you were eligible for the energy in 2021 and did not claim it on your 2021 return, you can amend your return for the appropriate year (2021) to take advantage of the savings.
Also, any unused energy tax credit claimed on your tax return can roll forward to future years and offset tax liability in those years.
This link may help:
Energy Tax Credit: Which Home Improvements Qualify?
Hope this helps. Thank you for asking.
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