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 business, which is mostly an oil manufacturer and refiner, said on Thursday.

In 2015 Galp got in into a 75%-25% joint venture 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 loads annually.

It will change waste materials, such as utilized cooking oils, into renewable biodiesel and biojet fuel, likewise referred to as sustainable air (SAF), using green hydrogen produced by an electrolyser powered by wind or solar power.

Galp said in a declaration it received on Wednesday the 3 reactors to process biofuels, which will permit the HVO unit to "produce SAF and biodiesel in 2026 ... placing Galp at the leading edge of developing low-carbon options vital 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-