The Muara Karang expansion project involved the addition of a new 500MW gas-turbine combine-cycle (GTCC) system to the existing Muara Karang power plant located in Pluit, North Jakarta, Indonesia.
The expansion project is part of a programme by the Indonesian Government to develop 35GW of new energy to meet the increasing domestic demand for power. The new combined-cycle system for the power plant is considered the most efficient in Indonesia.
The civil construction for the expansion commenced at the project site in August 2018. The expansion project began commercial operations in October 2021.
Muara Karang power plant location and background
Operated by state-owned electricity provider Perusahaan Listrik Negara (PLN), the Muara Karang power plant is located in the northern suburbs, approximately 10km northwest, of Jakarta, Indonesia. It had an installed capacity of 1.6GW before the 500MW expansion.
The power plant first commenced commercial operations in 1979 and is part of the 150kV network responsible for the supply of electricity to government agencies as well as some of the busiest business and retail customers in Jakarta. The Muara Karang facility was previously operated as a coal-fired plant. It was upgraded with the installation of three GE combined-cycle gas turbines in 1992 and two M701F gas turbines from Mitsubishi Hitachi Power Systems (MPHS) in 2011.
GE was engaged to upgrade the power plant’s gas turbine combustion systems in early 2016. The existing turbines were upgraded with the installation of GE’s 9E.03 gas turbine Advanced Gas Path (AGP) solution, which enables increased output and fuel efficiency. The upgrade also included the installation of GE’s Advanced Extendor (AE) 32K hardware to reduce component wear and combustion repair costs.
Muara Karang expansion make-up
A 500MW GTCC system, integrating Mitsubshi’s M701F gas turbine, steam turbine and auxiliary equipment, was installed at the power generation complex as part of the expansion.
The M701F gas turbine unit features a compressor shaft end drive, which reduces the impact of thermal expansion on shaft alignment. The rotor is provided with a simple single-shaft two-bearing support.
The turbine is protected by horizontally split casings, which enable the field removal of the blades without removing the rotor. The 415t turbine has a start-up time of 45 minutes and provides an efficiency of more than 62% in combined-cycle configuration.
Japan Bank for International Cooperation (JBIC), Mizuho Bank (Mizuho), and Australia and New Zealand Banking Group (ANZ) provided co-financing worth $37m for the Muara Karang expansion project. The Bank of Tokyo-Mitsubishi UFJ (BTMU) served as the agent for the financing transaction.
Japanese firm Nippon Export and Investment Insurance (NEXI) provided insurance worth $14.9m for the loan.
Mitsubishi Hitachi Power Systems (MHPS), along with Mitsubishi and Indonesian construction firm Wijaya Karya (Persero) (WIKA), was awarded a full turnkey engineering, procurement and construction (EPC) contract for the expansion project in September 2016.
MHPS supplied the main equipment including the M701F gas turbine, steam turbine and auxiliaries for the GTCC plant. The M701F unit was manufactured at MHPS’ Takasago Works in Hyogo Prefecture, Japan.
The electric generator systems were supplied by Mitsubishi Electric, while WIKA was responsible for the construction and installation works of the project.
MHPS is also responsible for providing maintenance and management support services for the GTCC system by remote monitoring under a long-term service agreement (LTSA). A full-time engineer from the company is also stationed at the power plant site.