DOI: 10.3303/CET2188093 Paper Received: 28 June 2021; Revised: 20 August 2021; Accepted: 8 October 2021 Please cite this article as: Somera J.D.C., Parado S.P.E., Castro M.T., Ocon J.D., 2021, Techno-economics of Hybrid System Electrification of Roll‑on/Roll‑off Vessels in the Philippines, Chemical Engineering Transactions, 88, 559-564 DOI:10.3303/CET2188093 CHEMICAL ENGINEERING TRANSACTIONS VOL. 88, 2021 A publication of The Italian Association of Chemical Engineering Online at www.cetjournal.it Guest Editors: Petar S. Varbanov, Yee Van Fan, Jiří J. Klemeš Copyright © 2021, AIDIC Servizi S.r.l. ISBN 978-88-95608-86-0; ISSN 2283-9216 Techno-economics of Hybrid System Electrification of Roll-on/Roll-off Vessels in the Philippines Jairus Dameanne C. Somera a , Sean Pierce E. Parado a , Michael T. Castro a , Joey D. Ocon a,b, * a Laboratory of Electrochemical Engineering (LEE), Department of Chemical Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines b Energy Engineering Program, National Graduate School of Engineering, College of Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines jdocon@up.edu.ph The shipping industry is vital for archipelagic countries like the Philippines as they allow transport between islands, but it is a notable contributor of greenhouse gases. In this work, a framework for analyzing the techno- economic potential of hybridizing a sea vessel with solar photovoltaics, lithium-ion batteries, and diesel generators was presented. The roll-on/roll-off vessel Filipinas Ozamis was considered as a case study due to its commercial use. A 3D model of the roll-on/roll-off vessel was used to measure the ship’s dimensions. The load profile of the vessel was estimated from the ship’s dimensions, operational profile, route, and speed according to the MarineTraffic AIS database. Afterwards, diesel-only and hybrid energy systems were sized in HOMER Pro to power the electrified ship while minimizing its costs and noting the available space on the sea vessel. Lastly, the profitability of the hybrid energy system was determined. The hybrid system was marked with increased capital costs, but the fuel consumption and CO2 emissions were 18.50 % and 27.90 % lower than those of the diesel-only system, respectively. The hybrid system also had lower generation costs and 23.64 % higher net present value than the diesel-only system. This framework can be used in the absence of measured load profiles and can be extended to other sea vessels to conduct a national techno-economic assessment of hybridizing the country’s maritime industry. 1. Introduction The shipping industry has been crucial towards the economic development of the Philippines because sea vessels provide a direct route between islands for trade and transport. The passenger vessel fleet accounts for 23.27 % of commercial vessels (MARINA, 2018). Under the passenger vessels, there are 402 conventional passenger vessels, 228 roll-on/roll-off (RoRo) vessels, and 68 fastcraft vessels, among which RoRo vessels have the largest capacity (MARINA, 2018). Sea vessels typically use an internal combustion engine (ICE) for propulsion, which consumes fossil fuels during operation. As a result, the shipping industry becomes one of largest contributors of greenhouse gas emissions. The hybridization of sea vessels is seen as an alternative to the continued reliance on ICEs. Hybridization refers to the integration of renewable energy (RE) technologies, such as solar photovoltaics (PV), into an energy system. This is primarily driven by the rapidly decreasing costs of RE technologies and has the added benefit of reducing CO2 emissions. Energy storage systems, such as lithium-ion (Li-ion) batteries, are also included to stabilize the intermittent generation of RE. The ICE is then replaced with an electric motor. There have been studies on the hybridization of sea vessels. Palconit and Abundo (2018) conducted a pilot study of an electric boat system as a reference for the viability of inter-island transport of 15 m-long electric ferries in the Philippines. Lee et al. (2013) also modeled a ferry operating in Geoje Island in South Korea that utilizes a 3.2 kW solar PV + battery + generator system. However, these two studies have limited applicability for commercial ships that have larger power demands. Al-Falahi et al. (2019) proposed a methodology to determine the optimal size for the energy storage system of a hybridized ship considering shore charging. Their study, however only considered the operational costs of the hybridized RoRo vessel and did not 559