The agreement for the construction of the 1,275 megawatt power plant also provides a provision for a 12-year service agreement, the French company said in a statement.
"Alstom will provide all engineering, procurement and construction services to deliver a fully integrated turnkey combined heat and power plant," the company said in a statement.
Alstom shares dipped 0.8 percent to EUR118.96 (US$160.10) in Paris.
Alstom has 81 units in commercial operation worldwide, with six units already operating in the U.K. and two further units under construction in southwest England.
The head of the British army, Nick Carter, said that Moscow was capable of taking "hostile actions" against the United Kingdom and NATO much earlier than expected