LISBON, Dec 19 (Reuters) - Portugal's Galp Energia expects 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 primarily an oil producer and refiner, stated on Thursday.

In 2015 Galp got in 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 capacity of 270,000 metric tons annually.

It will transform waste materials, such as used cooking oils, into renewable biodiesel and biojet fuel, also called sustainable aviation fuel (SAF), utilizing green hydrogen produced by an powered by wind or solar energy.

Galp stated in a statement it got on Wednesday the three reactors to process biofuels, which will enable the HVO unit to "produce SAF and biodiesel in 2026 ... putting Galp at the leading edge of developing low-carbon services necessary for the energy transition".

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