LISBON, Dec 19 (Reuters) - Portugal's anticipates to start producing biodiesel and biojet fuel from waste in an industrial-scale system it is constructing at its Sines refinery in 2026, the company, which is primarily an oil producer and refiner, said on Thursday.

In 2015 Galp got in into a 75%-25% joint endeavor with Japan's Mitsui to invest 400 million euros ($415 million) in the Hydrogenated Grease (HVO) plant, which will have a production capability of 270,000 metric tons annually.

It will transform waste products, such as utilized cooking oils, into eco-friendly biodiesel and biojet fuel, also referred to as sustainable air travel fuel (SAF), utilizing green hydrogen produced by an electrolyser powered by wind or solar energy.

Galp stated in a statement it got on Wednesday the three reactors to process biofuels, which will permit the HVO unit to "produce SAF and biodiesel in 2026 ... putting Galp at the forefront of establishing low-carbon services necessary for the energy shift".

Galp is likewise investing 250 million euros in a 100 megawatt (MW) electrolyser system to produce green hydrogen to power the refinery in Sines. ($1 = 0.9637 euros) (Reporting by Sergio Goncalves