Alstom will retrofit six units of the 4,460MW Belchatow power plant, the world's second-largest fossil power plant.
The two contracts worth €140m were signed with PGE Gornictwo, which owns and operates Belchatow and several power plants in Poland.
The first contract covers the retrofitting of the turbine island equipment on six units, which includes engineering, supplying and installing high-pressure and intermediate pressure turbines, associated auxiliaries, and a turbine controller.
The second contract will cover retrofitting the units' existing electrostatic precipitators (ESP), which help control particulate emissions levels to as low as 50mg/Nm3.
The retrofit will increase each of the six units' power output by 20MW, enough to power 240,000 additional homes and reduce the specific CO2 emissions by about 600,000t per year.