LISBON, Dec 19 (Reuters) - Portugal's Galp Energia anticipates to begin producing biodiesel and biojet fuel from waste in an industrial-scale unit it is building at its Sines refinery in 2026, the business, which is mainly an oil producer and refiner, stated on Thursday.

Last year Galp got in into a 75%-25% joint venture with Japan's Mitsui to invest 400 million euros ($415 million) in the Hydrogenated Vegetable Oil (HVO) plant, which will have a production capacity of 270,000 metric lots annually.

It will transform waste products, such as used cooking oils, into sustainable biodiesel and biojet fuel, likewise understood as sustainable air travel fuel (SAF), using green hydrogen produced by an electrolyser powered by wind or solar energy.

Galp said in a statement it received on Wednesday the three reactors to process biofuels, which will allow the HVO system to "produce SAF and biodiesel in 2026 ... placing Galp at the forefront of developing low-carbon services vital for the energy shift".

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