B-SMILE all set to call tenders for North-South twin tunnels

Bengaluru Smart Infrastructure Limited (B-SMILE), the recently formed special purpose vehicle, is all set to call global tenders for the North-South twin tunnel corridor between Hebbal and Silk Board. This follows the approval for a Build, Own, Operate and Transfer (BOOT) model with 40% Viability Gap Funding (VGF) from the government to be adopted to build tunnel roads in the city on June 5.

If everything goes according to plan, the twin tunnel roads will be open to the public by 2029-30 and the toll on these roads is estimated to cost ₹19/km and will be tolled by the companies that invest and build these roads for the next 30 years.

This corridor will be 16.74 km long and is expected to cost ₹17,780 crore. The VGF for this corridor will be ₹9,303 crore. The State Cabinet has already agreed to stand as a guarantor for a loan of ₹19,000 crore towards VGF for North-South and East-West tunnel roads. B-SMILE is in talks with lending agencies including Housing and Urban Development Corporation (HUDCO), a Government of India undertaking, which is also funding the Peripheral Ring Road (PRR).

Work to be split into two packages

With the past experience of PRR estimated to cost ₹27,000 crore not attracting any bidders in multiple global tenders, B-SMILE has decided to split the North-South twin tunnel corridor into two packages of roughly around 8.4 km each - North package from Hebbal to Race Course Road and South package from Race Course Road to Silk Board.

Two companies will bid and start building these tunnels at two ends simultaneously, which will also ensure the tunnels are ready faster. The tender, likely to be called soon after the government’s approval, will fix a 50 month (four years two months) deadline for the completion of the project, said B.S. Prahlad, Technical Director, B-SMILE.

Toll estimated at ₹19/km

A commuter will pay toll in two stages and toll collection will be completely automated through number plate recognition software, said Mr. Prahlad. “As per current estimates, the toll will be around ₹19 per km. Since this will be collected after five years, this is not high, and factoring in inflation, it will be comparable to other tolls elsewhere at that date,” he argued.

Twin Tunnels

The project involves building two unconnected tunnels for each direction of traffic next to each other, each three lanes wide. This essentially means the total length of earth to be tunnelled for the North-South corridor is 33.48 km. Sources said at least eight tunnel boring machines will be deployed simultaneously to speed up work. Each machine is capable of tunnelling 2 km per year, sources said.

Published - June 16, 2025 09:22 pm IST