LISBON, Dec 19 (Reuters) - Portugal's Galp Energia expects to start producing biodiesel and biojet fuel from waste in an industrial-scale unit it is developing at its Sines refinery in 2026, the company, which is mainly an oil manufacturer and refiner, said on Thursday.

Last year 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 loads each year.

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

Galp said in a declaration it received on Wednesday the three reactors to process biofuels, which will permit the HVO system to "produce SAF and biodiesel in 2026 ... placing Galp at the forefront of developing low-carbon solutions important 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;-RRB-