Builds plants that concentrate solar heat to make synthetic crude (syncrude), refined into drop-in solar kerosene, diesel and gasoline for aviation, shipping and road transport.
The bet
That concentrated solar heat can make drop-in liquid fuels industrially — and that a first-of-a-kind plant would unlock offtake, funding and bankability.
Built with investor money and German federal funding (Energy Research Program of the German Ministry for Economic Affairs and Climate Protection); SWISS has held a financial stake since 2022.
Founded in 2016 as a spin-off from ETH Zurich. The Sun-to-Liquid concept was first demonstrated in 2019 with a mini-refinery on the roof of ETH Zurich; construction of the first industrial plant, DAWN, began in Jülich, Germany in late 2022.
DAWN was inaugurated on 2024-06-20: a 20-meter solar tower with receiver, thermochemical reformer and thermal storage, producing several thousand liters of fuel per year. In July 2025 SWISS flew regular operations on solar jet fuel refined from DAWN syncrude via Hamburg. On 2025-12-16 SWISS signed a binding long-term offtake for at least 200 tons of solar jet fuel per year from 2027.
Validated and scaling: by August 2026 DAWN had reached full syngas nameplate capacity, DNV certified TRL 7, and DNV confirmed production costs below €1,000/ton at scale. In July 2026 North Rhine-Westphalia selected Synhelion's next commercial demonstration plant at Brainergy Park, Jülich, for 'Produktives.NRW' funding.
Synhelion's drop-in fuels work in existing aircraft, ships and cars with zero infrastructure change, which removes the adoption barrier that kills most e-fuel startups.
DAWN gave investors and buyers real industrial operating data instead of lab projections, which is why DNV could certify TRL 7 and validate cost estimates.
An anchor customer and investor (SWISS/Lufthansa) provided both capital and a first market, turning a technology milestone into a commercial contract.
Production costs validated below €1,000/ton make the scale-up path credible against fossil fuels rather than dependent on subsidy forever.
A first-of-a-kind plant is not just production — it is the sales document. Real operating data and independent validation convert a technology bet into offtake contracts and state funding.
As of 02 September 2026, Synhelion is in scale-up: DAWN runs at full syngas capacity and has delivered certified Jet-A-1 to SWISS, plus solar diesel and gasoline to customers including AMAG Group, Zurich Airport and the Lake Lucerne Navigation Company. The next plant — a commercial demonstration at Brainergy Park in Jülich with components scaled tenfold and output largely pre-sold under binding offtake — is backed by NRW/EU funding, with a Spain plant and a one-million-ton-per-year production target in the roadmap.
FOLLOW THE EVIDENCE
The sources
- Synhelion inaugurates DAWN – the world's first industrial plant for the production of solar fuels Synhelion · synhelion.com ·
- SWISS signs long-term offtake agreement for solar jet fuel from Synhelion Synhelion · synhelion.com ·
- Synhelion marks two years of synthetic aviation fuel demo SolarPACES · solarpaces.org ·
- From DAWN to bankable: German funding backs Synhelion's next synthetic fuel plant Swiss Power-to-X Collaborative Innovation Network (SPIN) · power-to-x.swiss ·