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 constructing at its Sines refinery in 2026, the company, 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 Grease (HVO) plant, which will have a production capability of 270,000 metric heaps per year.

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

Galp stated in a statement it received on Wednesday the 3 reactors to process biofuels, which will enable the HVO system to "produce SAF and biodiesel in 2026 ... putting Galp at the forefront of establishing low-carbon options important for the energy transition".

Galp is likewise investing 250 million euros in a 100 megawatt (MW) electrolyser unit to produce green hydrogen to power the refinery in Sines. ($1 = 0.9637 euros) (Reporting by Sergio Goncalves;-RRB-