The project will be commissioned in phases, official sources said on Thursday.
TCS was given the preliminary clearance and sources in state IT department said the project was now pending approval of the state finance department.
SWAN is a national level initiative where government offices and key agencies will be networked for providing data, voice and video services across the state.
SWAN, when completed, is expected to ensure efficient and reliable communication network, improved information flows among various levels and officials, reduce communication gaps, improve quality and speedy decision-making and better implementation of government schemes.