General Electric (GE) is the supplier of gas turbine, steam turbine and generator for the 780MW Tambak Lorok combined cycle power plant block 3 project. Image courtesy of General Electric.
Indonesia Power (IP) is the developer of the Tambak Lorok block-3 combined cycle power project. Image courtesy of Indonesia Power.
The 780MW Tambak Lorok gas-fired combined cycle power project is located in the Semarang district, Central Java, Indonesia. Image courtesy of Indonesia Power.

Tambal Lorok block-3 is a 780MW gas-fired, combined-cycle power project under construction in the Semarang district, Central Java, Indonesia.

Indonesia Power (IP), a wholly-owned subsidiary of Perusahaan Listrik Negara (PLN), is developing the facility as part of the Indonesia government’s plan to increase the country’s power generation capacity by 35GW.

The main civil construction works on the power project were started in February 2018. Upon commissioning, the block three of the Tambak Lorok combined-cycle power plant is estimated to generate approximately 3.7 gigawatt hours (GWh) of electricity which will be enough to power up to five million Indonesian homes annually.

Location and site details 

The Tambak Lorok combined cycle power plant block 3 project is located in Tanjung Mas subdistrict, Semarang district, in the Central Java province of Indonesia. 

The project site occupies approximately 10,625m2 within the existing PLTU Tambak Lorok power plant complex. 

Tambak Lorok block-3 plant make-up 

The Tambak Lorok block-3 plant will be equipped with a GE 9HA.02 gas turbine, a heat recovery steam generator (HRSG), and a D650 steam turbine in a 1-1-1 single shaft configuration. The combined-cycle facility will be designed to operate at an efficiency of 62.7%.

The other components of the project include cooling water pumps, condensate pumps, high pressure, low pressure and intermediate pressure feedwater pumps, main and closed cooling water system, raw water supply system, demineralised water treatment and supply system, fuel gas supply system, compressors, and an auxiliary boiler.

The electrical equipment include the generator set-up transformer, unit auxiliary transformer, gas insulated switchgear, and supporting electrical system. The plant will also be fitted with the distributed control system (DCS) and the continuous emission monitoring system. 

The other infrastructure facilities for the project involve the administration, control and electrical buildings, warehouse, workshop, gas receiving station, wastewater retention pond, and a fire protection building.

Power transmission 

The electricity generated by the Tambak Lorok gas-fired combined cycle power plant block three project will be evacuated into the grid through a 150kV power transmission line.

Contractors involved in the Tambak Lorok block-3 project

A consortium of General Electric (GE), Marubeni Corporation, and Hutama Karya (HK) was awarded an engineering, procurement, and construction (EPC) contract worth approximately £280m ($362) for the development of Tambak Lorok combined cycle block three power project in July 2017.

GE is responsible for the manufacturing and supply of the gas turbine, steam turbine and generators, along with the balance of plant equipment. GE also signed a service agreement for a period of 15 years.

Marubeni Corporation has been engaged for the supply of heat recovery steam generator (HRSG) along with the installation of key equipment for the project.

Tractebel-Engie was engaged to provide the owner’s engineer services, while AF Consultants carried out the feasibility study for the project in 2016.

Flenco was subcontracted by GE for the supply of auxiliary systems for the project, while RPC Technologies was engaged to carry out the hydrostatic testing of GRP cooling water pipes.

EPTCO Group was contracted for the civil works related to the circulation pump, foundation, exterior and interior of warehouse and workshop.

TFW Engineering fabricated and supplied 40-foot containerised demineralisation system for the power project in 2019.

Mitra Solusi Optimalindo supplied scaffolder manpower in September 2020, while New Voyage supplied medium intensity obstruction lights for the heat recovery steam generator of the power project.