1 Location: Plant type: Geothermal power Capacity: Completion: 2021Indonesia’s population and economy are growing at a remarkable rate, and the country’s demand for electricity far outstrips supply. Despite holding 40 percent of the world’s geothermal reserves, enough to produce about 30,000 MW, the country has done relatively little till now to make use of this resource. However, the Indonesian government has signaled a strong intention to begin developing the country’s geothermal resources.Geothermal energy is a clean and renewable power source, and plants of this type produce extremely little CO2, which is a major contributor to the greenhouse effect. For this reason, efforts to make use of this resource are gaining momentum, and its development is expected to bring great environmental and economic benefits.At the Lahendong III geothermal power plant, Yokogawa installed the CENTUM CS 3000 distributed control system (DCS) with redundant controllers, a backup system, and a test system in 2008. Based on the success of these installed systems, Yokogawa subsequently received an order to install its CENTUM VP DCS at the Lahendong IV geothermal power plant in 2010.Then, when carrying out projects to renovate the Lahendong I and II plants, PT PLN selected the CENTUM VP to replace the Lahendong, North Sulawesi, Indonesia6 x 20 MWexisting Bailey INFI 90 system that had been used to monitor and control the steam turbine auxiliary facilities as it was approaching the end of its useful life. The solid performance of the systems used, combined with Yokogawa's superior technical expertise in geothermal power generation, the proven quality of its products, and its extensive engineering and service network in Indonesia, were primary considerations in PT PLN's decision to go with the CENTUM VP solution again.Operator intervention during the automated plant and turbine startup and shutdown processes is minimized, ensuring safe and smooth startup and shutdown. This greatly reduces operator workload and errors, shortens the startup and shutdown times, and mitigates thermal and physical stress on the turbine.Plant InformationExecutive SummaryPT PLN is a government-owned company that manages the electric power industry in Indonesia, while PT Pertamina Geothermal Energy (PGE), also a government-owned company, develops geothermal steamfields. To ensure a stable power supply for North Sulawesi province, PLN and PGE have jointly built and are currently operating six geothermal power plants in Lahendong, which is located 30 km south of Manado, the provincial capital. The Challenges and the Solutions Automated plant and turbine startup and shutdownPlant and turbine startup and shutdown procedures are very complex and time-consuming, and place great stress on both personnel and equipment. To eliminate operator errors during these critical processes, the CENTUM DCS has automated plant and turbine startup and shutdown procedures. The startup and shutdown sequences are executed in accordance with the logic design, and the DCS human machine interface (HMI) clearly shows the status of the sequence and the facility conditions. It also guides operators in the acknowledgement of messages and alarms and the triggering of interlock sequences. PLN Lahendong Geothermal Power PlantsEnsuring Safe and Reliable Operations of Power Generation Units and Steamfields at PT PLN & PT Pertamina Geothermal Energy, Lahendong, Indonesia
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