All the electricity generated by my solar panel system is used by my household. Do I need to declare anything?

No. In this case, there is no commercial enterprise involved and no relevant category of income: operating costs are non-deductible private expenses, and any capital grant is not taxable. If you have financed the installation through a loan, the interest remains deductible as a special expense, subject to certain legal limits.

Updated on: 10/07/2026