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San Francisco, CA – April 14, 2025 – Cespira, a leading developer of alternative fuel propulsion systems, today unveiled the third generation of its High Pressure Direct Injection (HPDI) technology, targeting heavy goods vehicle (HGV) operators seeking to cut carbon emissions without sacrificing payload or range. The HPDI 3.0 system, designed for natural gas and hydrogen-compatible engines, promises up to 18% lower CO₂ output compared to previous HPDI versions, while delivering a 6% improvement in fuel economy under real-world driving conditions.
The core innovation lies in a redesigned injector nozzle and optimized combustion chamber geometry. Cespira engineers reworked the fuel-air mixing process to achieve more complete combustion, reducing methane slip—a persistent challenge for natural gas engines—by nearly 40%. The upgrade also extends injector service life by 30%, cutting maintenance downtime for fleet operators.
“HPDI 3.0 isn’t just a spec bump; it’s a practical tool for lowering total cost of ownership,” said Maria Torres, Cespira’s vice president of product development. “We focused on the pain points fleets told us about: durability, cold-start performance, and real-world emissions, not just lab numbers.”
Cespira ran a six-month pilot with three major fleets in California and Texas, accumulating over 1.2 million combined miles. Early data show that trucks equipped with HPDI 3.0 achieved a 14–18% reduction in tank-to-wheel CO₂ compared to an equivalent diesel HGV, with no significant difference in horsepower or torque curves. One fleet operator reported a 9% reduction in fuel costs despite higher natural gas prices, thanks to the efficiency gains.
Mike Brannigan, fleet director at GreenLine Logistics, commented: “We’ve been testing HPDI 2.0 for two years. The 3.0 upgrade was plug-and-play on our existing trucks. That’s huge—no need to buy new vehicles to hit our 2030 decarbonisation targets.”
Cespira’s announcement comes as the heavy-duty trucking industry faces tightening EPA greenhouse gas standards under the proposed Phase 3 rules. Rivals like Westport Fuel Systems and Cummins have also pushed HPDI-type technologies, but Cespira claims its 3.0 iteration achieves the lowest methane slip in the market—a critical advantage as regulators increasingly target unburned methane.
Industry analyst James Chen of Transport Energy Research noted: “Cespira is betting that natural gas remains a bridge fuel for another decade while hydrogen infrastructure scales. If they can prove methane slip near zero, HPDI 3.0 could be the most cost-effective way for legacy fleets to cut emissions right now.”
The HPDI 3.0 retrofit kit will be available in the US and Canada starting Q2 2025, with Europe and Asia-Pacific to follow in early 2026. Cespira did not disclose exact pricing but said the kit costs “comparable to a major engine overhaul” and offers a payback period of 12–18 months for high-mileage fleets. The company also announced an extended warranty of 500,000 miles on injectors—a first in the HPDI retrofit market.
Beyond CO₂, HPDI 3.0 reduces nitrogen oxide (NOx) emissions by an additional 12% versus HPDI 2.0, helping operators comply with California Air Resources Board (CARB) low-NOx standards. Particulate matter remains negligible, as natural gas combustion inherently produces far fewer soot particles than diesel.
Torres emphasised that Cespira is already testing a hydrogen-compatible version of HPDI 3.0, expected to reach commercial readiness by 2027. “Our architecture is fuel-agnostic,” she said. “The same injectors and control software can switch between natural gas and hydrogen with minimal recalibration.”
For fleet managers under pressure to decarbonize without disrupting operations, HPDI 3.0 offers a immediate upgrade path. Unlike battery-electric trucks, retrofitting a diesel tractor with HPDI retains full range and refueling speeds—critical for long-haul routes. Combined with the growing network of renewable natural gas (RNG) stations, the technology could extend the life of millions of existing diesel trucks while cutting lifecycle emissions.
Cespira plans to showcase HPDI 3.0 at the Advanced Clean Transportation (ACT) Expo in Las Vegas next month, where it will invite fleet operators to test-drive demo trucks. The company also released a white paper detailing the pilot results, available on its website.
Note: This article is based on information provided by Cespira and supplementary interviews with industry experts. Field data from pilot fleets is preliminary and subject to further validation.
