Aim of the work was to characterize the peels of novel tomato lines (with red, orange, pink, black-red, and dark-red fruit) for the content of bioactive substances and for some parameters linked to no-food use. Chlorophyll, polyphenols, and carotenoid content, energy value, theoretical biochemical methane potential (TBMP) through stochiometric method were evaluated. The peel color mirrored a different content of the bioactive substances: the dark-red fruits showed a significant increase of the carotenoid content, while the peel of the black-red fruits had the highest values of polyphenols. The preferential accumulation of functional compounds influenced the values of the other parameters. The colored lines compared to the red-fruited control (C) contained less carbon and hydrogen mass fractions and, subsequently, a lower LHV. This, in turn, led to a substantial difference in the estimation of the TBMP. Interestingly, this production was higher in the highly pigmented line, which contained a gene present in some high-lycopene commercial varieties. A circular production model for exhaustive use of peel is proposed. •Wastes of tomato processing (peels mainly) may be re-used for additional process.•Peels of new tomato lines with red, yellow or black color were analyzed.•Carotenoids and polyphenols content varied greatly depending by the peel color.•The content of the antioxidant compound affected in turn the potential BMP.•Once extracted the biocompounds peels may enter in the anaerobic digestion route.