Under the contract, Alstom will design the 660 MW supercritical boilers and supply identified pressure parts along with windboxes, a statement issued here said.
The units are expected to be commissioned in 2017. This project forms part of NTPC's bulk 660 MW tender, the release said.
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Alstom will also assist BHEL with technical advisors during the erection and commissioning of the units, it said.
Key components will be manufactured in the company's facilities in Concordia, USA, as well as in Durgapur in India.
"This contract marks another step into our successful collaboration on supercritical boiler technology. The North Karanpura power plant will operate with higher efficiency and therefore produce more power with reduced carbon emissions," Alstom Senior Vice-President Steam Business Andreas Lusch said.