TaTEDO-Sustainable Energy Services Organization (TaTEDO-SESO) is a sustainable energy services development organization based in Dar es Salaam, Tanzania. The organization is a non-profit organization initially registered in 1990 by the Ministry of Home Affairs and was re-registered by the NGO Registrar of Tanzania in 2022 under the Non- Governmental Organizations Act, No. 24 of 2002.

The organization has more than thirty-two years of experi-ence actively involved in the development of sustainable energy services, operating from its head office in Dar es Sa-laam and support offices in Dodoma and Kilimanjaro and with partners within and outside the country