The 877MW Komotini combined-cycle power plant is expected to commence operations in 2024. Image courtesy of Ballas, Pelecanos and Associates.
Siemens is supplying SGT5-9000HL gas turbine for the Komotini combined-cycle power project. Image courtesy of Siemens Energy.
The Komotini gas-fired power station is expected to offset up to 3.7Mt of CO2 emissions a year. Image courtesy of Zachary Scott-Singley/Flickr.

The Komotini power project is an 877MW combined-cycle gas turbine (CCGT) power plant under construction in Eastern Macedonia and Thrace, Greece.

Thermoilektriki Komotinis, a special purpose company, is developing the project with an estimated investment of €375m ($443m). Thermoilektriki Komotinis is a 50:50 joint venture between Motor Oil Renewable Energy (MORE), a subsidiary of Motor Oil Hellas (MOH) Group, and the Gek Terna Group.

Construction works on the Komotini CCGT power project were started in September 2021 with commissioning expected in early 2024.

The plant will use high-efficient gas turbine technology to reduce carbon dioxide (CO2) emissions by up to 3.7 million tonnes (Mt) a year compared to a coal-fired power plant.

The project will also facilitate the Greek government’s goal to withdraw all lignite-fired power plants in the country by 2028.

Location and site details

The Komotini combined-cycle gas-fired power project is located in the Komotini industrial area, Eastern Macedonia and Thrace, in north-east Greece.

Komotini combined-cycle power plant make-up

The Komotini power plant will be equipped with one Siemens SGT5-9000HL gas turbine, one SST5-5000 steam turbine, and one heat recovery steam generator (HRSG) in a 1×1 combined-cycle configuration.

The gas turbine will be connected to an SGen5-3000W generator, while the steam turbine will be connected to an SGen5-1200A generator. The plant will have a rated power output of 877MW and use Siemens SPPA-T3000 control system for safe and efficient operation.

SGT5-9000HL turbine details

SGT5-9000HL is an advanced air-cooled, heavy-duty gas turbine launched by Siemens in May 2020. The first SGT5-9000HL gas turbine was delivered to the Keadby 2 combined-cycle power project in the UK in the same month.

Derived from proven Siemens HL-class technology, it represents the most powerful gas turbine design from the German turbine manufacturer. It offers a ramp rate of 85MW a minute and a combined-cycle efficiency of up to 64%.

The gas turbine features an advanced can-annular combustion system to allow higher firing temperatures, along with 3D blading for higher aero efficiency in the compressor. It also features multi-layer thermal barrier coating for blade robustness, and super-efficient internal cooling to reduce the consumption of cooling air.

The SGT5-9000HL turbines are designed for both 50Hz and 60Hz operations. The 50Hz SGT5-9000HL gas turbine measures 43ft long and 16.5ft wide and weighs approximately 500 tonnes (t).

Contractors involved in the Greek gas-fired power project

Greek construction company Terna, a wholly-owned subsidiary of Gek Terna Group, was contracted to construct the Komotini combined-cycle gas-fired power plant in August 2021.

Siemens Energy was contracted by Terna to design, manufacture and supply the main equipment including the gas turbine, steam turbine, generators, HRSG, and the plant control system in September 2021.

Ballas, Pelecanos & Associates, a business law firm based in Athina, Greece, provided legal advisory services to Motor Oil and Gek Terna on the formation of the Komotini Thermoelectric project company.

Komotini combined-cycle power project background

MORE and Gek Terna Group signed a joint co-operation agreement to construct and operate the Komotini gas-fired combined-cycle power project in June 2021.

The Hellenic Competition Commission (HCC) approved the joint co-operation agreement in August 2021. The Regulatory Authority for Energy (RAE, Greece) had approved the investment in the project in July 2019.