Calcutta Electric Supply Corporation or CESC is India's first fully integrated electrical utility. It has been generating and distributing electrical power in Kolkata and Howrah since 1899. CESC Ltd is a flagship company of the RP-Sanjiv Goenka Group.

CESC is the sole distributor of electricity within an area of 567 sq km of Kolkata and Howrah serving 2.5 million consumers, which includes domestic, industrial and commercial users.

The company owns and operates four thermal power plants generating 1225 megawatt (MW) of power. These include Budge Budge Generating Station (750 MW), Southern Generating Station (135 MW), Titagarh Generating Station (240 MW), and New Cossipore Generating Station (100 MW). More than 80 per cent of customers’ electricity requirement is met through the company’s generating plants; the balance electricity is purchased from third parties. About 50 per cent of the coal requirement is sourced from captive mines.

The company is in the process of setting up a number of power stations in the country.