Theism Infratech Services is a group of organisations: Tarakeswar Electric Co., Theism Infratech and Theism Engineering Company's Electrical Supply and Maintenance Wing. The companies total over 600 employees and have worked on some of Bengal's largest electric projects, ranging from the electrification of the famous Howrah Bridge to the Andal Airport. The company was founded in 1969 by Bengali entrepreneur, R.N. Saha.