At first glance, tugboats seem like unlikely candidates for battery propulsion. They are tasked with shoving and pulling vessels that can weigh hundreds of thousands of tonnes, often in challenging conditions like strong winds, currents, and confined channels. In such situations, a sudden loss of thrust is not an option, which would appear to demand a power source with immense, continuous output.
However, according to CleanTechnica, this initial impression is misleading. The key is not the peak power rating but the duty cycle—how the tugboat actually uses power over time. While a tug may need a massive surge of power for a short maneuver, it does not sustain that level continuously. This pattern of brief, intense demand followed by lower-power operation is precisely where battery systems can excel.
In other words, the very nature of harbor tug work—short, powerful pushes and pulls with idle or transit periods in between—fits the strengths of battery propulsion better than a simple comparison of power ratings would suggest. The article argues that evaluating tugboats on their real operating profile, rather than their theoretical maximum output, reveals a more favorable case for going electric.