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

Last year Galp participated in 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 capacity of 270,000 metric loads per year.

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

Galp said in a statement it received on Wednesday the 3 reactors to process biofuels, which will enable the HVO unit to "produce SAF and biodiesel in 2026 ... positioning Galp at the leading edge 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