The NBTC's Universal Service Obligation (USO) Fund will chip in the remaining Bt18 billion.
However, the ministry might scale down the budget if it is found later that the investment will be overlapping.
Sukit Khamasundara, a member of the NBTC, said yesterday that the regulator would be responsible for expanding the broadband service throughout the country at public health centres, schools and local administration organisations, in five years.
The ministry will focus on installing fixed and wireless broadband access in 40,000 villages at a cost of Bt15 billion and install a new international Internet gateway for Bt5 billion.
A joint committee will be set up to coordinate this project and reduce redundancies.