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

In 2015 Galp participated in 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 transform waste materials, such as utilized cooking oils, into renewable biodiesel and biojet fuel, also referred to as sustainable aviation fuel (SAF), utilizing green hydrogen produced by an electrolyser powered by wind or solar energy.

Galp stated in a declaration it got on Wednesday the three reactors to process biofuels, which will allow the HVO system to "produce SAF and biodiesel in 2026 ... positioning Galp at the leading edge of developing low-carbon options vital for the energy shift".

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-