Spanish integrated energy firm Repsol plans to bring a 15,000 t/yr ultra-high molecular weight polyethylene (UHMWPE) plant online at its Puertollano complex in Spain in 2026.
The plant, originally scheduled for 2024, will use technology licensed from Dutch producer DSM. It is expected to support earnings growth in Repsol's olefins-focused petrochemicals business.
Earnings before interest, tax, depreciation and amortisation (Ebitda) from the chemicals division are also set to rise from the second quarter of 2026, as output ramps up at Repsol's upgraded Sines complex in Portugal.
"New margins are going to come from Sines," chief executive Josu Jon Imaz said. He added that the revamped site could contribute €80mn–85mn to second-quarter Ebitda in a low-margin scenario, and around €135mn under average market conditions.
His comments suggest a timeline for restarting the Sines site's 410,000 t/yr ethylene cracker, which has been offline since 2023, alongside the commissioning of new 300,000 t/yr linear polyethylene (PEL) and polypropylene (PP) units.
Repsol does not break out chemical earnings in detail, but said operating profit in the division fell by around €30mn in April–June from a year earlier. A widespread power outage on 28 April forced a full shutdown of all three of its chemical plants in Spain and Portugal, limiting its ability to benefit from improved margins.
The company's petrochemical margin indicator — a weighted average of product spreads — rose to €329/t in the second quarter, up from €269/t a year earlier. Repsol estimates the blackout and staggered restarts cost it around €45mn.
Polymer and monomer margins have improved so far in 2025, but the outlook remains challenging. "The crisis in the chemicals business is not over," Imaz said, citing flat demand and persistently high energy costs.
He pointed to technical upgrades at Sines and the development of more specialised products — such as the UHMWPE line at Puertollano — as key to improving competitiveness and margins.

