Return on investment
Under Three Years to Payback
The economics of maritime wind energy are straightforward. Fuel is the largest variable operating cost for most commercial vessels. A system that reduces fuel consumption reliably, with low maintenance requirements and no consumable costs, pays for itself quickly -- and then generates pure cost reduction for the remainder of its operating life.
Bunker fuel for commercial vessels currently sits between USD 700 and 1,000 per tonne. The range reflects price volatility over recent years; the calculation uses both ends of the range to show the spread of outcomes.
A marine diesel generator consumes approximately 0.295 kg of fuel per kWh of electricity generated. This is the standard conversion factor at typical generator load -- the number that translates turbine output directly into fuel not burned.
At these rates, every 1,000 kWh the turbines produce displaces approximately 295 kg -- just under 0.3 tonnes -- of diesel. Across 780,000 kWh of annual production from a four-turbine 100 kW configuration, that is approximately 230 tonnes of diesel per year.
Based on 6,500 operating hours per year and a 10--30% wake/shadow reduction for multi-turbine layout. Aerodynamic drag reduction adds further savings not included above.
The payback period is calculated against the capital cost of a four-unit installation. Exact capital figures are provided during the vessel assessment process -- they depend on vessel type, deck configuration, and installation complexity. Contact us for a project-specific figure.
The payback period is the time to recover the capital investment. After that point, the turbines continue generating savings for the remainder of their operating life with no fuel cost and minimal maintenance requirements.
A 20-year design life -- the standard for commercial maritime equipment -- means that after a three-year payback, the system delivers 17 further years of pure cost reduction. At the mid-range fuel price of USD 850 per tonne, a four-turbine 100 kW configuration generates approximately USD 3.1 million in direct fuel savings over that 17-year period, excluding any drag reduction benefit and without accounting for fuel price increases.
For operators with vessels on active routes for ten years or more, the economics are compelling regardless of where within the USD 700--1,000 fuel price range they sit.
For vessels on time charter, the payback calculation looks different at first. Under a standard time charter, the charterer pays for fuel -- which means the owner bears the installation cost while the charterer captures the fuel saving. It is a structural misalignment that stalls many installations that are otherwise financially sound.
Two mechanisms resolve it.
EU ETS cost belongs to the owner. Under the BIMCO EUETS clause (the most widely adopted charter party amendment covering EU ETS compliance), the EU Allowance (EUA) cost for covered EU voyages is borne by the vessel owner, not the charterer. A 100 kW turbine installation displacing 230 tonnes of diesel per year reduces EUA surrender obligations by approximately 730 tonnes of CO₂ at current EU ETS pricing of €50--80 per tonne -- a direct annual saving to the owner of €36,000--€58,000. This benefit accrues to the owner regardless of who pays for fuel under the charter party.
CII rating improvement affects charter rate. A vessel's annual CII rating affects its market position. Vessels rated C or better command preferential access to cargo and charter opportunities; D or E-rated vessels face additional documentary requirements and commercial pressure from cargo owners who are themselves under CSRD supply chain reporting obligations. An H Nordic installation that moves a vessel from D to C -- common for vessels near a rating boundary -- is a commercial asset that supports a higher charter rate at renewal. That benefit flows to the owner.
The combined effect of EUA cost reduction and CII-driven charter rate improvement makes the financial case for time charter operators materially stronger than a fuel savings calculation alone would show. For a vessel on a major EU route running 6,500 hours per year, EUA savings alone recover 20--35% of a four-unit installation cost at current ETS pricing -- without any contribution from fuel savings.
Maritime decarbonisation is a stated priority for EU and Nordic funding bodies. Several programmes are directly relevant to H Nordic installations on qualifying vessels.
The EU Innovation Fund supports innovative low-carbon technologies in industrial sectors including maritime. Qualifying installations may receive grant support covering a portion of capital costs. Eligibility depends on vessel flag, operator domicile, and project scale.
Norway, Sweden, Denmark, and Finland each operate national maritime decarbonisation programmes with varying eligibility criteria and award sizes. H Nordic can provide documentation to support applications under any of these schemes.
Grant support directly reduces net capital outlay and shortens the payback period. At a 30% grant rate, a three-year payback becomes approximately two years. H Nordic recommends raising funding eligibility early in the vessel assessment process -- most programmes require applications before equipment is ordered.
For vessels where deck layout allows an eight-unit deployment, the economics scale proportionally. Annual fuel savings reach USD 322,000 to 460,000 on direct generation alone. The incremental capital cost of the additional four units is lower than a greenfield eight-unit installation -- and operators who start with four units have the option to expand based on observed performance data from their own vessel.
Send us your vessel type, route, and fuel cost and we will model the payback period for your specific operating profile.
Request a vessel assessment See the full fuel savings model