Istanbul-based Karadeniz Energy boasts the world’s largest fleet of powerships—a special purpose floating, mobile powerplant. Its fleet contains 16 vessels totaling 3.3GW capacity. 18 more, totaling 5GW, are under construction or ‘in the pipeline’. The dual fuel engine units, operating in combined cycle mode,  can in theory run on gas but in reality mostly run on fuel oil (countries with a gas network are unlikely to need powerships).

The firm sells itself as a...