The bank will provide up to $55m to Chaiyaphum Wind Farm Company, which is 90% owned by Electricity Generating Public Company and 10% by Pro Ventum.
ADB will also provide an additional $30m from its Clean Technology Fund.
The plant, which will be built in Chaiyaphum province, is expected to start commercial operation by December 2016.
The project will be constructed as a public-private partnership under Thailand’s small power producer program with Chaiyaphum signing a power purchase agreement with the state-owned Electricity Generating Authority of Thailand.
ADB private sector operations department director Christopher Thieme said: "Wind energy provides a clean and sustainable source of electricity which will help diversify the country’s energy mix, strengthen energy security and reduce Thailand’s reliance on fossil fuels.
"The project will also help accelerate and expand private investment in clean energy infrastructure."
Thailand is planning to install 1.8GW of wind capacity by 2021, from a current total of 223MW.
