WBSETCL is responsible for transmitting electricity from generating sources to load centers through a transmission network operating at 400kV, 220kV, 132kV and 66kV spread across West Bengal.

WBSETCL is currently playing three distinct functional roles envisaged under the Electricity Act 2003 Company's transformation capacity stood at about 16,350 MVA as of March 2010.

WBSETCL recorded the highest compound annual growth rate (CAGR) of 13.5% in transformer capacity during 2006-07 to 2009-10 among all state utilities.

About 10 new substations would be commissioned by WBSETCL in the current fiscal(2010–11), which would add 2,180 MVA to its existing transformer capacity.

Besides the commissioning of new sub-stations, capacity augmentation would be undertaken at 12 existing substations, of which five are at the 220 kV level.