Biofuels produced from agricultural waste will fuel passenger ships from the Spanish port of Algeciras across the Strait of Gibraltar.
It is the first time that Spanish passenger vessels have used this kind of fuel, which is known as second-generation biofuel and is being produced by oil and gas firm Cepsa.
Naviera Armas Trasmediterránea ferries will be fuelled by biofuels made from agricultural waste for 84 trips
Eighty-four trips on Naviera Armas Trasmediterránea ferries will be fuelled by the biofuel in August.
The fuel is being produced at the San Roque Energy Park (Campo de Gibraltar, Cádiz), where Cepsa has transformed one of its plants to enable it to produce 2G fuels via co-processing.
The company says second-generation biofuels can be used in vessels with no need for engine modification.