03 Dec 2019

115 MW of Geothermal Capacity Under Development on Indonesia

03 Dec 2019  by Alexander Richter   

With six geothermal power projects under development on Flores Island in East Nusa Tenggara (NTT), Indonesia, up to 115 MW of geothermal power generation capacity could be added by 2028. State utility PT PLN supports development on Flores Island, East Nusa Tenggara (NTT), Indonesia, by adding electricity capacity in the region. PLN also ‘challenged’ investors to invest in the island. The state-owned electricity company even affirms that it is ready to meet the electricity needs of business people who will expand in Flores and its surroundings.


“We have prepared electricity infrastructure for the next few years. In addition to the power plant, we are also preparing interconnection transmission that will connect the entire Flores Island, “said PLN Lambok Siregar’s Flores Generation Implementation Unit Manager in Labuan Bajo, NTT, last week.

He added, PLN was developing a number of power plants that were spread in several areas ranging from Labuan Bajo on the western tip of Flores to Larantuka in the east. The electricity supply from the new power plant will be interconnected through a transmission network along a total of 600 circuit kilometers (kms).

As for the electricity supply, in the future Flores will rely on geothermal power plants (PLPT) as the main energy source. In total there will be six geothermal power plants to strengthen the reliability of electricity supply.

The six are the Sokoria geothermal plant with a total capacity of 30 MW which will enter the electricity system in 2020 (with 5 MW) to 2028, then the geothermal plant of Ulumbu #5 plant with a capacity of 20 MW in 2024, the Mataloko plant with 2×10 MW (2024), the Ulumbu # 6 plant with 20 MW (2027), Oka Ile Ange plant with 10 MW (2028), and Atadei plant 10 MW (2025-2027). Especially for the Sokoria PLTP, the first phase will produce electricity of 5 MW in February 2020.

“Later electricity from geothermal energy will become the backbone of electricity in Flores because of its large potential based on the results of studies reaching 660 MW,” Lambok said – as we reported earlier today. Based on PLN data, until November 2019, the installed capacity of power plants in Flores reaches 190 MW.

Of this amount came from diesel power plants (PLTD) which reached 45.01%, gas engine power plants (PLTMG) 37.09%, steam power plants (PLTU) 7.36%, geothermal power plants ( PLTP) 6.63%, solar power plants (PLTS) 2.36%, and micro hydro power plants (PLTMH) 1.52%.

The existence of PLTP in Flores, Lambok said, is also expected to contribute to the renewable energy mix program by 23% in 2024. At present the EBT mix in Flores is claimed to reach 18.29%. According to Lambok, the electricity supply from the PLTP will gradually replace the electricity that has been relying on PLTD.

“Hopefully, with the existence of electricity from this PLTP production costs will be cheaper. In addition, it is also more environmentally friendly, “he said. PLN Vice President of Public Relations Dwi Suryo Abdullah said, in developing the electricity system in NTT and its surroundings, the state-owned electricity company considered the potential of the existing area.

“Geothermal energy in Flores has a great potential to be developed. Likewise solar energy, it is suitable for the needs of small islands, “he said. Dwi hopes that a number of electricity infrastructure developments in Flores can help the government’s goal of achieving a 100% electrification ratio nationally by 2020.

As of August 2019, in geneUlumbu Geothermal Plant (Source: Geothermal Development Associates)

ral the electricity conditions in NTT have a capacity of 335 (MW) with a peak load reaching 214.3 MW. As for the network, NTT has 387.4 km of transmission lines with a total substation capacity of 235 MVA. While the electrification ratio in NTT has only reached 84.68% with a total number of subscribers of 785,775 connections in 22 districts. PLN targets the electrification ratio in NTT to reach 100% next year.

According to Dwi, one of the ways to achieve the electrification ratio in NTT is to utilize natural resources, such as solar power plants (PLTS). In the Flores region there are a number of islands that rely on electricity from PLTS, including Messa Island, Nuca Molas, Papagarang, Tribur, Seraya Marannnu, Batu Tiga, Kojandoi, Permaan, Treseng, and Usulanu.

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