Société tunisienne de l'électricité et du gaz (الشركة التونسية للكهرباء و الغاز) or STEG is a Tunisian public company non-administrative.

Established in 1962, its mission is the production and distribution of electricity and natural gas on the Tunisian territory.

STEG is the second-largest Tunisian company by revenues in 2009.

[1] Until August 1959 the Tunisian electricity industry was divided among eight different companies.

62-8 of 3 April 1962, the State terminates this situation by creating a public monopoly given to the STEG.