LISBON, Dec 19 (Reuters) - Portugal's Galp Energia anticipates to start producing biodiesel and biojet fuel from waste in an industrial-scale system it is developing at its Sines refinery in 2026, the company, 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 Grease (HVO) plant, which will have a production capacity of 270,000 metric heaps each year.

It will transform waste products, such as utilized cooking oils, into sustainable biodiesel and biojet fuel, likewise called sustainable aviation fuel (SAF), utilizing 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 permit the HVO unit to "produce SAF and biodiesel in 2026 ... positioning Galp at the leading edge of establishing low-carbon solutions necessary for the energy transition".

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