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All Journal Journal Zetroem International Journal of Industrial Engineering and Engineering Management Jurnal Penelitian Rumpun Ilmu Teknik Science and Education Journal Jurnal Ilmiah Multidisiplin Indonesia
Rendroyoko, Ignatius
Institut Teknologi PLN, Jakarta
Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Physics Social Sciences

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Development of Alternative Energy Transition Scenarios for Electricity Utility Companies in 2045 Using the Scenario Planning Method: Imtihan, Najahul; Rendroyoko, Ignatius
International Journal of Industrial Engineering and Engineering Management Vol. 7 No. 1 (2025)
Publisher : Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/ijieem.v7i1.10125

Abstract

In implementing the energy transition, electricity utility companies must be able to carry out future planning to replace electricity infrastructure from a fossil energy-based generation system to clean energy generation and new renewable energy (NRE) to achieve Net Zero Emission (NZE) conditions by 2060. Term planning. What has often been done so far is to use forecasting methods, which are made by utilizing historical databases and using many assumptions about economic, social, and environmental conditions, as well as other factors that are easily changed and close to uncertainty. Therefore, planning methods must consider possible changes and uncertainties with several possible scenarios. Scenario planning is planning with a strategic approach that focuses on the process, involving finding optimal strategies for several scenarios that can occur, and this method helps deal with uncertainty. This paper explores the development of alternative scenarios that may occur in 2045, using scenario planning to help electricity utility companies capture opportunities and offset threats. It focuses on formulating broad and innovative strategies for the energy transition in the electricity business.
Development of Alternative Energy Transition Scenarios for Electricity Utility Companies in 2045 Using the Scenario Planning Method: Imtihan, Najahul; Rendroyoko, Ignatius
International Journal of Industrial Engineering and Engineering Management Vol. 7 No. 1 (2025)
Publisher : Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/ijieem.v7i1.10125

Abstract

In implementing the energy transition, electricity utility companies must be able to carry out future planning to replace electricity infrastructure from a fossil energy-based generation system to clean energy generation and new renewable energy (NRE) to achieve Net Zero Emission (NZE) conditions by 2060. Term planning. What has often been done so far is to use forecasting methods, which are made by utilizing historical databases and using many assumptions about economic, social, and environmental conditions, as well as other factors that are easily changed and close to uncertainty. Therefore, planning methods must consider possible changes and uncertainties with several possible scenarios. Scenario planning is planning with a strategic approach that focuses on the process, involving finding optimal strategies for several scenarios that can occur, and this method helps deal with uncertainty. This paper explores the development of alternative scenarios that may occur in 2045, using scenario planning to help electricity utility companies capture opportunities and offset threats. It focuses on formulating broad and innovative strategies for the energy transition in the electricity business.
Analysis of the Application of Co-Firing Using Sawdust–Coal on the Performance of PLTU 3 Banten Lontar Fandhi Afriansyah; Ignatius Rendroyoko
Jurnal Ilmiah Multidisiplin Indonesia (JIM-ID) Vol. 5 No. 03 (2026): Jurnal Ilmiah Multidisplin Indonesia (JIM-ID), March 2026
Publisher : Sean Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study analyzes the implementation of co-firing using sawdust in combination with coal at PLTU 3 Banten Lontar. The primary objective of this research is to evaluate the impact of co-firing application on power plant performance, thermal efficiency, exhaust gas emissions, and the cost of electricity production (BPP). The research method employed was an experimental approach, comparing 100% coal combustion with a fuel mixture consisting of 95% coal and 5% sawdust, conducted at PLTU Banten Lontar. The results indicate that the implementation of co-firing reveals a non-linear relationship between the 5% sawdust blending ratio and the composition of electrical energy generated. Furthermore, the application of co-firing reduced the cost of electricity production by IDR 46.45/kWh and successfully decreased CO₂, SO₂, and NOx emissions. Specifically, CO₂ emissions were reduced by 8.82%, SO₂ emissions decreased by 17.3%, and NOx emissions declined by 8.5%. The implications of this study suggest that co-firing can serve as a more environmentally friendly and cost-effective alternative for the power generation sector, with the potential for broader implementation in other coal-fired power plants across Indonesia.
Transforming Investment Structures in Capital-Intensive Electricity Utilities: A Managed Service Approach for CapEx-to-OpEx Transformation Ignatius Rendroyoko; Najahul Imtihan; Ishak Sinaga
ZETROEM Vol 8 No 2 (2026): ZETROEM
Publisher : Prodi Teknik Elektro Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/ztr.v8i2.8135

Abstract

Electric utilities operate in a capital-intensive environment characterized by substantial infrastructure investment requirements, long asset life cycles, regulated tariffs, and relatively stable financial returns. Increasing electricity demand and energy transition initiatives have intensified the need for alternative financing mechanisms that support infrastructure expansion while maintaining service reliability and affordability. This study evaluates the transformation of conventional Capital Expenditure (CapEx)-based investment structures into Operating Expenditure (OpEx)-based arrangements through managed service models in electricity utilities. Using a mixed-method explanatory case study and techno-economic analysis, the study examines managed service implementation for 160 kVA distribution transformers in Indonesia's electricity distribution sector. The analysis incorporates lifecycle cost evaluation, cash flow assessment, and financial indicators including Net Present Value (NPV) and Internal Rate of Return (IRR). The results show that the managed service model improves financial flexibility by replacing large upfront investments with predictable periodic payments and transferring operational risks to service providers. However, this flexibility is accompanied by an approximately 15% increase in lifecycle NPV compared with the conventional Total Expenditure (TOTEX) model. These findings demonstrate that managed services represent a viable alternative financing strategy for capital-intensive electricity utilities facing investment constraints
Asesmen Tekno-Ekonomi Co-firing Sawdust Terintegrasi CCS pada PLTU Batubara Subkritis Agus Salim; Ignatius Rendroyoko
Jurnal Penelitian Rumpun Ilmu Teknik Vol. 5 No. 3 (2026): Jurnal Penelitian Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juprit.v5i3.6666

Abstract

Coal-fired power plants (CFPPs) remain dominant in Indonesia's electricity mix and are a major contributor to national CO2 emissions, while the government targets an emission reduction of up to 43.20% by 2030 and Net Zero Emissions by 2060. Sawdust biomass co-firing and Carbon Capture and Storage (CCS) are two decarbonization options for existing CFPPs, yet their combined effect on the technical, economic, and environmental performance of a subcritical pulverized coal (PC) unit has not been widely studied in an integrated manner. This study analyzes the effect of sawdust biomass co-firing ratio variation (5-30%) combined with MEA-based post-combustion CCS on the technical performance, economics, and CO2 emission intensity of a 350 MW subcritical PC power plant, as well as the sensitivity of its economic feasibility to carbon prices, using IECM 13.0 simulation software. The results show that biomass co-firing incurs only a minor performance penalty, whereas CCS reduces net power output from 314.34 MW to 206.26 MW and net efficiency from 31.08% to 18.85%. The Levelized Cost of Electricity (LCOE) increases by approximately 219% after CCS implementation, from 0.0514 to 0.1638-0.1669 USD/kWh, while net CO2 emissions reach carbon neutrality at a 10% co-firing ratio and continue to decline to a negative value (-0.3392 kg/kWh) at a 30% co-firing ratio with CCS. Carbon price is shown to be the most dominant factor determining the economic feasibility of CCS, with the effective LCOE approaching the national average at a carbon price of around 100 USD/tCO2.
Kajian Eksperimental Pengaruh Variasi Discharge Rate terhadap Karakteristik Elektrokimia dan Termal Baterai Lithium-Ion Silinder LCO, LFP, NMC, dan NCA Sumedi Sumedi; Ignatius Rendroyoko; Prasetyo Adi Nugroho
Jurnal Penelitian Rumpun Ilmu Teknik Vol. 5 No. 3 (2026): Jurnal Penelitian Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juprit.v5i3.6753

Abstract

Lithium-ion batteries are a key component of modern energy storage systems, including electric vehicles and renewable energy integration. Nevertheless, their performance is strongly affected by operating conditions, especially the discharge rate. This study aims to evaluate the effect of discharge rate variation (0.5C, 1C, 2C, and 3C) on the electrochemical and thermal characteristics of four commercial cylindrical lithium-ion cell chemistries - LCO, LFP, NMC, and NCA, using a quantitative experimental method with a Neware CE-6002n Battery Testing System and a Hioki LR8450 Memory HiLogger. Test results show that discharge capacity decreased by 2.3–8.9% from 0.5C to 3C, while discharge energy decreased significantly by 14–21% due to reduced working voltage caused by internal resistance. Energy efficiency dropped from a range of 83–94% to 65–80%. Surface temperatures of the NMC and NCA cells exceeded 60°C at a 3C discharge rate, surpassing the safe operating limit, whereas LCO exhibited the lowest ΔT value. Based on the Simple Additive Weighting method applied to seven performance parameters, the overall performance ranking obtained was NMC > LCO > NCA > LFP. The quadratic regression model provided the best representation for capacity, energy, and temperature rise, while the geometric model was most suitable for energy efficiency.
Optimalisasi Tekno-Ekonomi Dan Penilaian Stabilitas Dinamis Dari Integrasi PLTS–Bess Pada Sistem Kelistrikan Pulau Nias Yanuar Ishaq; Ignatius Rendroyoko
Science and Education Journal (SICEDU) Vol 5 No 3 (2026): Science and Education Journal 2026
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/sicedu.v5i3.1298

Abstract

Sistem kelistrikan Pulau Nias merupakan sistem kelistrikan terisolasi yang masih didominasi oleh pembangkit berbasis bahan bakar fosil, sehingga menyebabkan biaya pembangkitan dan emisi karbon yang relatif tinggi. Di sisi lain, potensi energi surya di wilayah tersebut memberikan peluang untuk memanfaatkan sistem Solar Photovoltaic (PV) guna mendukung transisi energi. Penelitian ini bertujuan untuk menentukan konfigurasi optimal sistem hibrida yang terdiri atas PLTS, Battery Energy Storage System (BESS), dan pembangkit eksisting dengan mempertimbangkan aspek ekonomi, teknis, dan lingkungan. Optimasi dilakukan menggunakan HOMER Pro berdasarkan profil beban, potensi energi surya, karakteristik pembangkit, serta parameter ekonomi dan operasional. Selanjutnya, keandalan konfigurasi hasil optimasi dievaluasi menggunakan DIgSILENT PowerFactory melalui analisis respons frekuensi dan tegangan. Hasil optimasi menghasilkan konfigurasi dengan kapasitas PLTS sebesar 40 MWp dan BESS sebesar 70 MWh, dengan Renewable Fraction sebesar 15,8%. Konfigurasi tersebut mampu menurunkan Levelized Cost of Energy (LCOE) sebesar 16,25%, dari Rp4.456/kWh menjadi Rp3.732/kWh, serta mengurangi emisi CO₂ sekitar 22,54% dibandingkan kondisi sistem eksisting. Hasil simulasi stabilitas menunjukkan bahwa ketika terjadi penurunan keluaran PLTS sebesar 75%, frekuensi minimum mencapai 49,49 Hz dan tegangan turun hingga 69,89 kV sebelum kembali stabil. Hasil tersebut menunjukkan bahwa integrasi PLTS dan BESS dapat mengurangi ketergantungan terhadap pembangkit berbahan bakar fosil serta menekan emisi karbon dengan tetap mempertahankan stabilitas sistem kelistrikan Nias.
Co-Authors Agus Salim Fandhi Afriansyah Imtihan, Najahul Ishak Sinaga Najahul Imtihan Prasetyo Adi Nugroho Sumedi Sumedi Yanuar Ishaq