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This article proposes strategies to optimize the energy use of biogas and sludge in anaerobic sewage treatment plants (WWTPs). The research is applied and descriptive, in a case study in the metropolitan region of Curitiba. The procedures used were: survey of qualitative (documentary) and quantitative (secondary) data from the WWTPs; computational simulation of the biogas and sludge production of the WWTPs; financial and performance analysis of strategies. The energy recovery strategies obtained were (in 2043): thermal drying and motor generator in 6 WWTPs (1,680 MWh.month-1 avoided); biogas engine in 5 WWTPs (655 MWh.month-1 avoided); sludge for integrated WWTP and the burning of biogas in 18 WWTPs. Conclusion: at least 26% of the WWTPs showed performance and financial viability for the use of biogas and sludge in 2017 and 38% in 2043. [ABSTRACT FROM AUTHOR]