Siemens will expand the capacity at the M-Station plant within the Jebel Ali power station complex in UAE, under a contract signed with Dubai Electricity and Water Authority.
The AED1.47bn ($400m) contract will increase the power generation capacity of the project by 700MW.
The expansion is expected to be completed by the end of April 2018.
The facility is claimed to be the largest power production and desalination plant in the country. It currently has a production capacity of 2,060MW power.
DEWA managing director and CEO Saeed Mohammed Al Tayer said: "The expansion project includes adding two gas turbine generators, two heat recovery steam turbine generators, and one back pressure steam turbine.
"This will increase the plant’s thermal efficiency from 82.4% to 85.8%, which is considered among the highest thermal efficiency rates in the world."
M-Station is built with an investment of AED 10bn ($2.72bn). It includes a desalination plant that supplies 140m gallons of water every day.
The Jebel Ali power station complex in Dubai forms the backbone of the city’s power supply and produces 7,800MW of power from seven stations.
DEWA currently has an installed capacity of 9,656MW power and daily capacity to produce 470m gallons of desalinated water.