TT-Line Switches Two RO/ROs to Bio-LNG

Why It Matters

The move proves renewable LNG can power large ferries at commercial scale, accelerating decarbonisation of European short‑sea shipping. It offers a replicable model for operators seeking climate‑neutral operations without costly engine redesigns.

Key Takeaways

• Bio‑LNG powered two TT‑Line ferries in 2025
• Emissions dropped 100% per tonne of fuel replaced
• Engine performance unchanged during bio‑LNG operation
• No aging effect on methane emissions observed
• Bio‑LNG sourced from northern European agricultural waste

Pulse Analysis

TT‑Line’s recent switch of its Nils Holgersson and Peter Pan ro‑ro ferries to bio‑LNG marks a concrete step toward decarbonising short‑sea transport in the Baltic region. The vessels, launched in 2022 and 2023, now run on a climate‑neutral fuel derived from agricultural waste, eliminating the carbon footprint associated with conventional liquefied natural gas. By integrating bio‑LNG into regular service, the operator demonstrates that renewable marine fuels can be deployed at scale without disrupting schedules, offering passengers a greener crossing between Germany, Sweden, Poland and Lithuania. The initiative also aligns with the EU’s Fit for 55 roadmap, reinforcing regional climate targets.

The bio‑LNG trial was conducted in partnership with Everllence PrimeServ Germany, whose dual‑fuel 8L51/60DF and 6L51/60DF engines required no hardware modifications as long as the fuel met the prescribed methane number. Continuous emission monitoring over a year confirmed that methane output remained stable and that the engines showed no signs of accelerated wear. Moreover, the measured emission reductions on the test bed were replicated in real‑world operations, validating the reliability of bio‑LNG as a drop‑in replacement for fossil LNG on large ro‑ro vessels. These findings give ship owners confidence to scale bio‑LNG across mixed‑fuel fleets.

Beyond TT‑Line’s fleet, the successful bio‑LNG deployment signals a viable pathway for European ferry operators facing tightening CO₂ regulations and growing passenger demand for sustainable travel. The fuel’s carbon‑neutral profile—saving 2.75 t CO₂ per tonne of fossil LNG—offers a clear economic incentive when paired with certification schemes that allow operators to market carbon‑offset voyages. As supply chains for agricultural biogas mature, bio‑LNG could become a cornerstone of the maritime energy transition, encouraging further collaborations between shipyards, engine manufacturers, and renewable fuel providers. Governments may further accelerate adoption through subsidies and port‑level incentives for low‑carbon bunkering.