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

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

It will transform waste products, such as utilized cooking oils, into eco-friendly biodiesel and biojet fuel, likewise known as sustainable aviation fuel (SAF), utilizing green hydrogen produced by an electrolyser powered by wind or solar power.

Galp said in a declaration it received on Wednesday the three reactors to process biofuels, which will enable the HVO unit to "produce SAF and biodiesel in 2026 ... placing Galp at the forefront of establishing low-carbon options important for the energy transition".

Galp is also 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-