JAKARTA – PT Perusahaan Listrik Negara (Persero) inaugurated Compressed Natural Gas (CNG) Plant at Grati PLTGU, Pasuruan, East Java. CNG Plant, which has a capacity of 15 MMSCFD of this , is the largest in the world.
Director of PLN Nur Pamudji explained that with a capacity of 15 MMSCFD it means having the ability to channel gas to 3 units of gas turbine with a total capacity of 300 MW for about 4 to 5 hours in a day during peak load.
Typically, the design of PLTGU / PLTG Grati is primarily using gas fuel. The use of gas for power plants, said Nur, will extend the distance between maintenance periods.
“The engine is also relatively more durable when using gas fuel, than if forced to burn fuel . So the cost of machine maintenance will be reduced, “said Nur in his written statement, Friday (14/6).
Another benefit of this CNG, continued Nur, gas supply contract is usually take or pay (used or not used still must pay). Associated with the needs of the electricity system, there are times in a day where the power plant is not operating because the electricity needs are not too high, which consequently the gas is not used.
Nur said that the gas is not wasted, while the payment argo is still running, then innovation is done, namely by storing the gas supply into the installation of CNG Plant and use it during peak load. “The double gain is achieved because the loss of take or pay can be minimized, and when the peak load does not need to use fuel,” explained Nur.
Furthermore, Grati PLTGU / PLTG consists of 2 blocks which currently get gas supply of 90 BBTUD from Santos through Oyong and Wortel wells. “The gas supply is capable of supplying three gas turbine (combined cycle) blocks 1 each of 100 MW. While Block 2 (Open Cycle) serves as a peak load bearer (peaker) using HSD fuel, “he explained.
Nur added that the cost of electricity production is about 2,800 rupiah per KWH, while if using CNG, the BPP is only Rp 1,000 / kWH. With the production of Grati Block 2 gasoline power plants for 4 to 5 hours per day ranging from 1,200 to 1,500 MWH, the potential savings due to the reduction of fuel is approximately 1 trillion per year. (Chi / jpnn )