Maersk is carrying out a large-scale retrofit programme across its time-chartered fleet, involving around 200 vessels owned by 50 different shipowners.

As explained, the goal is to improve fuel efficiency and cargo capacity, cutting both operating costs and greenhouse gas emissions. This initiative is part of Maersk’s wider decarbonisation strategy, which targets a 35% absolute reduction in scope 1 emissions by 2030 (from a 2022 baseline) and net-zero by 2040. While fuel transition will be key to long-term goals, Maersk sees efficiency upgrades as a powerful near-term lever for emissions reductions.

Our medium- and long-term chartered fleet makes up a significant proportion of our operations as well as of our total fuel consumption. By working closely with our partners, we aim to implement solutions that not only reduce emissions but also enhance the overall competitiveness of our fleet.

… said Ahmed Hassan, Head of Asset Strategy and Strategic Partnerships at Maersk. 

The programme covers over 1,500 completed projects and another 1,000 planned by 2027, with investment costs shared between Maersk and vessel owners. Maersk views this as a win-win: the company lowers its fuel use and emissions, while owners benefit from modernised, more competitive ships.

Many of these ships were designed and constructed at a time when container vessels in general were sailing at faster speeds. To bring down fuel consumption, we have over the years introduced less compressed vessel schedules, but the propellers and bulbs optimized for faster speeds have been kept. There lies a big efficiency potential in replacing them

… commented Anda Cristescu, Head of Chartering & Newbuilding at Maersk

Retrofit measures vary by vessel but often include replacing propellers and bulbous bows with modern designs optimised for today’s slower sailing speeds, improving hydrodynamics and reducing drag.

Pre-Swirl Devices, shaft generators, and auxiliary engine waste heat recovery systems are also being introduced to cut fuel consumption.

In addition to efficiency upgrades, the retrofits enhance cargo-carrying capacity. Structural improvements such as elevating wheelhouses, raising lashing bridges, strengthening deadweight capacity, and upgrading lashing systems and loading software help vessels carry more while maintaining safety and compliance.