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Horse and Repsol Unveil H12 Hybrid Concept Running on 100% Renewable Gasoline

The project pairs a high‑efficiency three‑cylinder with Nexa 95 renewable fuel to target sizable reductions.

Horse and Repsol teamed up to tweak the pictured HR12 into the H12 Concept engine for next-generation clean powertrains

Overview

  • - Horse Powertrain revealed the H12 Concept hybrid engine designed to operate on Repsol’s 100% renewable Nexa 95 gasoline.
  • - The companies report a peak brake thermal efficiency of 44.2% and WLTP fuel use below 3.3 L/100 km, roughly 40% lower than the 2023 EU average.
  • - Horse estimates a mid‑size car using the H12 setup could cut annual CO2 emissions by about 1.77 tonnes versus a comparable ICE on fossil gasoline.
  • - Two prototypes have been built and their performance “validated,” according to Horse, with a demonstrator vehicle expected to be shown soon.
  • - Reported gains are attributed to a 17:1 compression ratio, optimized turbo, new EGR, high‑energy ignition, reduced friction via Repsol lubricants, and improved hybrid gearbox energy management; Repsol says Nexa 95 is produced at industrial scale with a second plant planned this year.