Towage contracts are beginning to change because ports are moving past broad sustainability language and toward harder operating expectations that touch tug procurement, service scoring, data reporting, shore-power readiness, and lower-emission vessel deployment. In 2026, that shift looks stronger than it did a year ago because FuelEU Maritime is now in force, port decarbonization programs are more concrete, repeat low-emission tug projects are more visible, and ports are investing more actively in infrastructure and sustainability tracking. That does not mean every towage contract suddenly has a strict green clause, but it does mean contract structures are increasingly likely to reward cleaner tonnage, better emissions data, and future-ready service models.
2️⃣ Reporting clauses around fuel use, emissions, or energy source
3️⃣ Service requirements linked to shore charging or fuel access
4️⃣ Bonus or preference structures for cleaner towage capacity
5️⃣ Availability terms for mixed fleets instead of one standard tug type
6️⃣ Upgrade language that anticipates fleet transition during contract life
7️⃣ Contract terms that connect towage to port-wide decarbonization goals
One of the earliest and most likely changes is not a formal ban on older tugs. It is the use of tender evaluation criteria that reward lower-emission fleets, cleaner propulsion pathways, or stronger transition plans. That kind of scoring lets a port influence behavior without fully rewriting its towage model overnight.
This makes sense because ports often move through preference and scoring mechanisms before they move through harder service restrictions.
Once ports start measuring and publishing more sustainability data, towage contracts may increasingly require tug operators to provide fuel-consumption data, energy-source information, or periodic emissions summaries. FuelEU Maritime does not directly regulate towage contracts as such, but it reinforces a broader culture of maritime energy tracking and verifiable data, and ports are under growing pressure to show concrete sustainability progress. :contentReference[oaicite:1]{index=1}
For operators, that means the contract edge may increasingly belong to companies that can report cleanly and consistently, not just tow effectively.
Cleaner towage is not only a vessel issue. It depends on charging, shore power, grid support, or future-fuel bunkering. That is why ports getting more serious about emissions may start writing operational infrastructure coordination into contracts, especially where electric or lower-emission tug use depends on defined access to port energy systems.
In practical terms, this means the towage agreement may increasingly describe how the tug service interacts with the port’s energy assets, not just how quickly the tug responds.
Another likely change is language that rewards progress during the contract term. Ports may become more interested in towage providers that can improve the emissions profile of the fleet during the life of the agreement through retrofits, fuel changes, or staged tug replacement rather than waiting until the next full tender cycle.
That would quietly increase the commercial value of retrofit headroom and future-ready tug design.
Ports are unlikely to accept a cleaner towage fleet that performs poorly operationally. That means contract evolution is likely to combine emissions ambitions with response-time standards, uptime expectations, and dispatch-quality requirements. In other words, the greener tug does not replace the reliable tug. The contract may increasingly expect both.
This is one reason operators with both clean-technology readiness and strong dispatch culture may gain the most from contract change.
Ports may not immediately impose strict low-emission towage mandates everywhere. In many markets, a more practical first step is contract preference, bonus scoring, term advantages, or explicit support for operators bringing lower-emission capacity into service. That can shift procurement without creating a sudden service gap.
From a contract-design standpoint, incentives may prove more realistic than hard requirements in the early stages.
Use this quick screen to estimate how likely a towage market may be to see emissions-linked contract changes.
