Unfortunately, it seems not, according to the IRS:
..."costs are treated as being
paid when the original installation of the item is completed, or, in
the case of costs connected with the reconstruction of your
home, when your original use of the reconstructed home begins.
For purposes of the residential energy efficient property credit
only, costs connected with the construction of a home are
treated as being paid when your original use of the constructed
home begins. If less than 80% of the use of an item is for
nonbusiness purposes, only that portion of the costs that is
allocable to the nonbusiness use can be used to determine
either credit."
https://www.irs.gov/pub/irs-pdf/i5695.pdf
Also, unfortunately, Solar power in California used to qualify for a tax credit, however it's no longer available since 2005
