The articles in this issue were authored and co-authored by researchers from Universitas Pertamina (Indonesia), Chulalongkorn University (Thailand), Institut Teknologi Bandung (Indonesia), Institut Teknologi Sumatera (Indonesia), Universitas Khairun (Indonesia), Universitas Teknologi Yogyakarta (Indonesia), and Politeknik Negeri Ujung Pandang (Indonesia).

This issue of JESCEE presents significant contributions across chemical process engineering, strategic business management in oil and gas, occupational health and safety in cold chain logistics, and renewable energy assessments, focusing on resource extraction, risk mitigation, and sustainable energy solutions.

• Flavonoid Extraction An investigation into ultrasound-assisted extraction of mangosteen peel to yield flavonoids for natural sunscreen formulations, evaluating Total Flavonoid Content and Sun Protection Factor (SPF).
• Fuel Terminal Business Strategy A strategic analysis of Pulau Sambu Fuel Terminal's marketing and business resilience in response to permanent establishment taxation policies and shifting energy trends in Southeast Asia.
• Cold Storage Risk Assessment An evaluation of goods sorting activities in a Japanese cold storage warehouse using Job Safety Analysis (JSA) to identify and mitigate extreme occupational health and safety hazards .
• Marine Current Energy Assessment A hydrodynamic modeling study utilizing Delft3D to evaluate the energy potential of marine currents in the Pulau Pisang Strait for the development of Ocean Current Power Plants.
• Off-Grid Photovoltaic Systems The design and performance analysis of a standalone photovoltaic system aimed at supplying reliable electrical energy to aquaculture ponds in Bori Appakah.

This volume delivers valuable insights into maximizing natural product utility, navigating regulatory impacts on fossil fuel logistics, enhancing warehouse operational safety, and transitioning towards localized renewable energy infrastructures.