BIMCO's retrofit addendum targets shipping's payback divide

A fuel-saving retrofit costing roughly $2.35m can pay for itself in about 2.45 years on a 5,000 teu container ship — while the shipowner who funded it recovers barely half of that outlay before the charter ends. On October 8, 2026, BIMCO's Documentary Committee adopted a standard contract form designed to close exactly that gap: the Energy Saving Device Retrofit Addendum 2026.

What does the new addendum change?

BIMCO's stated rationale is the structural split baked into time charter. The owner owns the vessel; the charterer typically buys the bunkers. If the owner pays to burn less fuel, the immediate saving lands in the charterer's accounts first. If the charterer pays, the steel stays on someone else's ship when the fixture ends. BIMCO puts it plainly: the party that funds the retrofit may not take the main operational benefit.

The new form lets parties allocate cost, time implications and benefits. It does not prescribe a single commercial model. Notably, it goes further than the bunker bill: parties can allocate environmental benefits separately from operational ones, meaning one piece of equipment can create value in more than one account. Under BIMCO's existing ETS clause for time charter, the charterer provides and pays for allowances corresponding to the vessel's emissions during the charter period — so burning less fuel inside EU ETS scope also cuts the charterer's allowance needs.

How big is the payback gap?

DNV's Maritime Forecast to 2050 models a 5,000 teu case combining a bow modification, propeller retrofit and propeller boss cap fin, delivering roughly 16% fuel savings with payback of one to four years depending on fuel price. Industry coverage prices that package at about $2.35m. That calculation belongs to the ship. It says nothing about who receives the saving.

Run an illustrative case without DNV's discounting: a vessel burning 10,000 tonnes a year at $600 per tonne, with a 16% cut, saves $960,000 annually. Against $2.35m of kit, simple payback is about 2.45 years. Now assume the owner funds the entire amount and keeps half the saving. The owner's payback stretches to roughly 4.9 years. On a three-year charter, the retrofit would have generated $2.88m in fuel savings — $530,000 more than its cost — yet the owner would have recovered only $1.44m, leaving $910,000 unrecovered when the fixture ended. The ship reaches payback before the investor does. The 50/50 split is an assumption, not a BIMCO default, and these sums ignore discounting, finance, off-hire, maintenance, residual value and any regulatory credit.

Time is not a footnote either. A ship can sit in the yard with hire running while the propeller comes off. The steel invoice has started; the bunker saving has not.

Who is already doing these deals?

Maersk described in October 2025 a programme spanning about 200 time-chartered ships across 50 owners: more than 1,500 efficiency projects completed, with roughly 1,000 more targeted for 2027, and investment costs split with the vessel owners. Many of those ships were designed for higher speeds than today's schedules demand; the propeller and bow often were not updated to match. The charterer gets lower fuel costs and lower emissions; the owner gets a modernised asset.

DP World Shipping Solutions and MPC Container Ships tested a more explicit version of the same bargain. On an MPC-owned vessel chartered by DP World, they jointly invested in energy-efficiency upgrades and amended the charterparty to share both installation costs and the resulting fuel-saving benefits, with Vessel Performance Solutions monitoring performance improvements.

In July 2026, Seaspan and Maersk described about $75m in completed and planned fleet-upgrade investment across 18 vessels on long-term charter, including a major retrofit package for four 13,000 teu ships. The money can move under time charter. The question is on what terms.

How do you prove what was saved?

Sharing a performance benefit requires someone to say how much was saved — and last year's 10,000 tonnes against this year's 8,500 is not proof. Speed, draft, weather, hull condition and trade profile all move the burn. The number parties must agree on is a counterfactual: what the ship would have consumed if nothing had been fitted. BIMCO's form even contemplates that a fuel-saving device may increase fuel consumption rather than reduce it. That is why the contract requires a baseline, an assessment method and, where agreed, an independent assessor.

The scaffolding arrived fast: in March 2026 the Mærsk Mc-Kinney Møller Center published procedures for measuring retrofit savings, followed in June by a framework for sharing costs and benefits, and in October BIMCO gave the bargain standard contractual form. Shipping already knows how to save some of the fuel; whether the addendum resolves who keeps the saving will depend on how aggressively charterers negotiate baselines in the year ahead.