Carbon pricing has entered shipping’s cost structure
Maritime transport entered the EU Emissions Trading System (EU ETS) in 2024. With the publication of the European Commission’s 2025 Carbon Market Report, there is now official data showing how the sector has responded in practice and what this means economically.
The message from the first year is clear. EU ETS is no longer just a regulatory framework for shipping. Its impact is now evident in real market behavior, with emissions translated into verified obligations and measurable costs.
This marks an important shift in how shipping economics are evolving.
Shipping is already complying at scale
One of the strongest signals in the Commission’s report is the level of compliance achieved in the first year.
According to the European Commission, shipping companies surrendered allowances for more than 99% of their required EU ETS obligations by the deadline. The Commission notes that the introduction of EU ETS for maritime transport “ran smoothly” (European Commission press release on the 2025 Carbon Market Report).
This matters because it demonstrates that the system is functioning as intended. Reporting, verification, and surrendering are not being delayed or avoided. They are being executed.
High compliance confirms that carbon pricing is now being treated as a standard operating condition within the industry rather than a future consideration.
Verified emissions show the scale of exposure
The economic relevance of EU ETS for shipping becomes clearer when looking at the volume of emissions now covered.
The Commission reports that around 90 million tonnes of CO₂ emissions from maritime transport were verified under the EU ETS framework in the first year. More than 13,000 vessels and over 3,000 shipping companies were included (European Commission, Carbon Market Report 2025).
This places a significant share of shipping activity serving European trade directly inside a carbon pricing system.
These are not marginal volumes. They represent a material and recurring exposure that will shape operating economics going forward.
Carbon costs are now hitting shipowners’ cash flow
EU ETS translates emissions into a concrete financial obligation through the requirement to purchase and surrender allowances.
The system is being phased in as follows:
- 2024 emissions: 40% must be covered, with surrender in 2025
- 2025 emissions: 70% must be covered, with surrender in 2026
- From 2026 emissions onward: 100% coverage
From 2024 and 2025, EU ETS applies to carbon dioxide (CO₂). From 2026, the scope expands to also include methane (CH₄) and nitrous oxide (N₂O), further widening the emissions base subject to pricing (European Commission overview of EU ETS for shipping).
Allowances are acquired on the EU carbon market, where prices have risen steadily since the second half of last year and are now trading in the low-to-mid €90s per tonne of CO₂ (EU carbon market price data).
To illustrate the scale, a large ocean-going vessel emitting around 50,000 tonnes of CO₂ per year could reasonably have 20,000 tonnes of those emissions fall within EU ETS scope, depending on its trading pattern. Under the 2024 phase-in, around 40% of this amount would need to be covered, corresponding to approximately €0.7 million in carbon costs at €90 per tonne, rising toward €1.8 million per year as coverage is fully phased in, and higher if allowance prices continue to increase over time.
At this point, EU ETS moves decisively onto shipowners’ balance sheets, creating a significant cost burden with wide-ranging operational and commercial implications. Even if the structure of the regulations changes, carbon pricing now provides a clear additional economic driver, beyond fuel costs, for improving energy efficiency.
What this means for shipping economics
EU ETS does not prescribe how emissions should be reduced. It establishes a price signal.
From an economic perspective, two variables matter:
- Fuel choice, which determines carbon intensity
- Energy efficiency, which determines how much energy and fuel are required to deliver a given transport service
As carbon prices rise and fuel costs increase more broadly, reducing energy demand becomes more valuable. Lower fuel consumption directly reduces operating costs and lowers exposure to carbon pricing under EU ETS.
This logic applies across today’s fuel mix and in future scenarios where lower-carbon fuels are expected to carry higher production and supply costs.
As a result, energy efficiency increasingly functions as a core economic and compliance lever rather than a secondary optimization.
What this means for shipping economics
Energy efficiency has long been part of the discussion in shipping, driven in large part by fuel costs, which represent one of the largest operating expenses for shipowners.
Now that EU ETS requirements for maritime transport are being applied in practice, with verified emissions carrying a direct financial obligation, the long-standing expectation of tightening environmental regulation has become an immediate and additional economic imperative.
As a result, energy efficiency moves up the priority list for shipbuilders, owners and operators, as reducing energy demand helps manage both fuel costs and growing exposure to carbon pricing.
The role of waste heat recovery and ORC technology
There is a broad range of technologies available to shipping companies to improve energy efficiency in response to this market shift, and meeting long-term efficiency and compliance targets will typically require a combination of measures rather than a single solution. Among these, on-board waste heat recovery stands out as a commercially proven, relatively simple to install, and cost-efficient measure.
A significant share of the energy produced by marine engines is lost as heat. Organic Rankine Cycle (ORC) systems recover low-temperature waste heat and convert it into usable electrical power. This reduces the load on auxiliary engines and generators, lowering fuel consumption for the same operational output.
In a carbon-priced environment, these efficiency gains translate directly into economic value. Lower fuel use reduces operating costs while also limiting exposure to EU ETS obligations on emissions covered under the maritime scope. Importantly, these benefits apply regardless of trading pattern and remain fully compatible with both conventional fuels and future low- and zero-carbon alternatives.
ORC-based waste heat recovery solutions, like Climeon’s HeatPower 300, illustrate how mature efficiency technologies align with the economic realities now emerging under EU ETS, offering a practical way for operators to manage rising cost exposure while maintaining operational flexibility.
From first data to strategic decisions
The European Commission’s 2025 Carbon Market Report provides the first concrete evidence of how EU ETS is functioning in maritime transport. The data points to high compliance and substantial emissions coverage, confirming that carbon pricing has moved from expectation to enforcement and is now a tangible part of shipping economics.
Shipping has long been engaged in improving efficiency and reducing its environmental footprint, supported by industry-wide standards and a high level of coordination. EU ETS builds on this foundation, while also introducing a meaningful new cost burden that operators must manage alongside existing commercial pressures and the need to remain competitive with other modes of transport.
As carbon costs become embedded alongside fuel costs, energy efficiency emerges as a central economic lever. The first year of EU ETS confirms that this signal is now active, shaping investment priorities and operational strategies across the sector.
Discuss what energy efficiency could mean for your fleet
EU ETS is changing the economics of shipping. Our maritime team works with operators of large commercial vessels to assess where waste heat recovery can deliver practical, cost-effective efficiency gains.
