Advancing Sustainable Icebreaking: Alternative Fuels and Operational Efficiency for a Northern Baltic Sea Case

Abstract The Arctic and sub-Arctic regions are critical to global trade and energy supply, yet they pose immense operational and environmental challenges. Icebreaking services play a pivotal role in ensuring the accessibility of ports and maritime routes during winter months. This study analyzes the fuel consumption of icebreaking vessels and evaluates the potential of alternative fuels to create more sustainable and efficient icebreaking operations. The analysis begins with an evaluation of icebreaking fuel consumption during typical winter scenarios – ranging from mild to severe conditions. Current Estonian icebreakers including MSV Botnica operate primarily on marine diesel oil. For example, under normal winter conditions, fuel consumption can exceed 1000 metric tons during the icebreaking season for a single vessel. This underlines the urgent need for more sustainable energy solutions especially as climate models predict shorter, but more extreme ice periods in the coming decades. Alternative fuels such as biofuels, methanol, ammonia, and hydrogen offer viable pathways for decarbonizing icebreaking operations. Methanol is the main alternative fuel in this study. Economic considerations remain at the forefront of the transition to alternative fuels. This research demonstrates that methanol has the potential to transform icebreaking operations in the Northern Baltic Sea offering substantial environmental benefits while ensuring operational reliability.