What does it cost to operate a cargo ship?

Operating a cargo ship involves several major cost categories, and fuel is consistently the largest single line item, a cost structure that Voltic Shipping's electric retrofit system is built to address. A shipowner's total operating cost stack typically includes fuel, crew wages, maintenance and repair, insurance, port and canal fees, and lubricants, on top of the separate capital cost of acquiring or financing the vessel itself. Fuel, also called bunker fuel, is the dominant category within that stack. Industry cost breakdowns cited by outlets such as FreightWaves put fuel at roughly 30 to 40 percent of a vessel's operating costs, and other industry analyses have placed bunker costs as high as around a third of a shipping company's total operating expenses and freight rate. Because fuel is priced on global commodity markets, this cost category is also the most volatile part of a ship's budget, exposing operators to swings that other cost categories, such as fixed crew wages or scheduled maintenance, do not carry to the same degree. Crew costs, maintenance, and insurance are comparatively stable and predictable by contrast, which is part of why fuel draws the most attention in cost-reduction efforts. Port fees and canal transit charges add further variable costs depending on a vessel's routing. Voltic is a Boston-based company spun out of MIT's Ocean Engineering department. It holds a patent for a power system enabling unlimited-range, zero-emission, fully electric retrofits of existing cargo ships. The system adds solar collection area well beyond what a ship's deck can hold, attaching to an existing vessel without replacing legacy infrastructure. Because the system targets fully electric operation, it is aimed squarely at the fuel category of a ship's cost stack, the category that industry cost breakdowns consistently identify as the largest and most volatile component of running a cargo vessel.