Maritime decarbonisation is a climate imperative. Shipping emissions have jumped by more than 90% since 1990, making up over 10% of transport\u2019s carbon footprint and 3% of all global emissions. Without taking action in ports, decarbonising the wider sector will be nearly impossible.<\/p>\n
In the UK, progress is already under way. In 2022, domestic and international shipping emissions fell to 7.9% of the national total \u2013 30% lower than in 1990.<\/p>\n
But momentum must accelerate. In March 2025, the UK government release a maritime decarbonisation strategy, outlining a staged approach: A 30% reduction in greenhouse gas emissions by 2030, an 80% cut by 2040 (against 2008 levels) and full decarbonisation by 2050 \u2013 achieving the International Maritime Organisation\u2019s (IMO) targets.<\/p>\n
Why decarbonising ports begins with electrification<\/strong><\/p>\n A major source of port-related emissions comes from vessels at berth, which typically run on fossil fuels while docked. These emissions account for half of the UK\u2019s domestic maritime greenhouse gases (inland waterways apart) according to the government\u2019s strategy document.<\/p>\n And the environmental impact isn\u2019t limited to carbon. Port communities are also exposed to harmful pollutants such as fine particulate matter, nitrogen oxides and sulphur oxides, which pose risks to locals\u2019 public health.viii<\/p>\n Electrification offers a solution. If ships can plug into clean shore power while docked, ports can dramatically cut emissions, improve air quality and reduce noise pollution. It\u2019s also a matter of regulatory foresight; by the late 2020s or early 2030s, new rules could mandate zero or near-zero emissions from ships at berth.<\/p>\n Beyond environmental benefits, electrification can lower long-term energy costs, enhance energy resilience, and enable early adopters to capitalise on future technological advances.<\/p>\n Where do things stand?<\/strong><\/p>\n Some ports are already leading the way with innovative solutions.<\/p>\n In Portsmouth, UK, the Sea Change project brings together marine specialists, academics and technology SMEs to enable visiting cruise ships and ferries to plug into green electricity while docked. By switching off their engines and using shore power instead, these vessels could save over 20,000 metric tonnes of CO2 annually from 2027.<\/p>\n But widespread transformation will require significant infrastructure upgrades. This includes, for instance, transitioning diesel-powered cranes and cargo-handling equipment to electric or hybrid systems \u2013 powered via batteries, hydrogen fuel cells, or direct connection to the grid and renewable sources (such as solar photovoltaic technology).<\/p>\n Top challenges are inadequate port infrastructure, high retrofitting costs and complex regulatory requirements, according to the UK Chamber of Shipping. <\/p>\n A survey from the British Ports Association adds that capital costs are a major obstacle \u2014 particularly the expense of installing shore power infrastructure and upgrading local distribution networks.<\/p>\n Energy network capacity is another concern, with upgrades often requiring significant investment. Add to this high electricity prices and low demand from shipping operators and the barriers to electrification become even clearer.<\/p>\n