International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 06 | Jun 2025
p-ISSN: 2395-0072
www.irjet.net
Techno-Economic Analysis of 500kV Java-Bali Connection Transmission Line (JBC) Pramono Ajie1, Jaka Windarta2, Singgih Saptadi3 Master of Energy, Graduate School, Diponegoro University, Semarang City, Indonesia ---------------------------------------------------------------------***--------------------------------------------------------------------coal, and liquefied natural gas (LNG), which are Abstract - Electricity demand in Indonesia especially Java
predominantly imported from outside the island. This dependency not only raises environmental and cost concerns but also poses risks to supply security.
and Bali system is projected to grow significantly over the next decade. Bali, as a global tourist destination, promotes renewable energy development through the Bali Clean Energy policy (Governor Regulation No. 45/2019). However, most of Bali’s current electricity is still supplied by fossil-fuel-based plants, with primary energy sources imported from other provinces. In line with the clean energy vision, large-scale coalfired power plants are no longer a viable option in Bali, despite rising electricity needs.
In response, PT PLN (Persero) has proposed a strategic infrastructure project within the 2021–2030 Electricity Supply Business Plan (RUPTL), the 500 kV Java-Bali Connection (JBC). This high-voltage transmission link will interconnect Bali with the Java power system, enabling the transfer of lower-cost electricity generated by highly efficient Ultra Supercritical coal power plants in Java. The JBC is not only a technical solution to mitigate projected power deficits in Bali, but also a strategic enabler of the province’s clean energy vision, by reducing reliance on small-scale, fossil-based generation units.
To address this, PLN as the state electricity company in Indonesia plans to construct the 500 kV Java-Bali Connection (JBC) transmission project as outlined in the Electricity Supply Business Plan (RUPTL) 2021–2030. The project will connect Java’s power system to Bali via a +185 km circuit transmission line, including a + 6.5 km submarine cable across the Bali Strait, enabling Bali to access lower-cost electricity from highefficiency power plants in Java [1].
Technically, the JBC spans approximately + 185 km, including a + 6.5 km subsea cable crossing the Bali Strait [1]. Beyond enhancing energy security and supply reliability, this project is expected to significantly lower Bali’s Basic Cost of Electricity Supply (BPP) by optimizing generation resources across the two islands.
This study aims to assess the technology and economic feasibility of the JBC project. It includes: (1) a 10-year load forecast for Bali; (2) a transmission voltage level analysis among 66 kV, 150 kV, and 500 kV options; (3) an ampacity analysis of the submarine cable; (4) an economic evaluation using Net Present Value (NPV), Internal Rate of Return (IRR), Benefit-Cost Ratio (B/C), and Payback Period; and (5) a sensitivity analysis for scenarios such as increased generation costs, rising investment costs, and reduced energy transfers. The findings aim to support energy policy and infrastructure decisions to ensure long-term power supply reliability and promote clean energy in Bali.
This study aims to conduct a comprehensive technoeconomic analysis of the 500 kV JBC project, with specific focus on its capacity to address Bali’s electricity demand forecast over the next 10 years, determine the optimal transmission voltage level, assess cable current-carrying capacity, and evaluate economic viability using financial indicators such as Net Present Value (NPV), Internal Rate of Return (IRR), Benefit-Cost Ratio, and Payback Period. Sensitivity analyses are also conducted to test the project’s feasibility under various scenarios, including fluctuations in BPP, investment cost changes, and energy transfer volumes.
Key Words: Power Transmission, Load Forecast, Voltage Level, Ampacity, Submarine Cable, Economic Feasibility, Sensitivity Analysis
Through this analysis, the study contributes data-driven insights to support national energy transition strategies, while offering practical recommendations for investment planning, technology selection, and inter-island transmission development.
1.INTRODUCTION The continuous growth in electricity demand across Java and Bali necessitates the development of robust and sustainable energy infrastructure. Bali Province, recognized globally as a premier tourism destination, has declared its commitment to clean energy through the enactment of Governor Regulation No. 45/2019 on Bali Clean Energy, aimed at transforming Bali into an eco-friendly, green tourism island. However, despite this progressive vision, Bali’s electricity supply still largely relies on fossil-fueled generation, including diesel,
© 2025, IRJET
|
Impact Factor value: 8.315
2. TECHNOLOGY ANALYSIS To address the electricity supply challenges in Bali, two primary alternatives are considered: (1) the construction of new Power Plant facilities on the island, and (2) the development of a 500 kV Java-Bali interconnection network.
|
ISO 9001:2008 Certified Journal
|
Page 525