Syntholene Energy

Member Profile

Category: eSAF & PtL Producers
Primary Role: eSAF Producer
Area of Expertise: Thermal Integration for Low-Cost eFuel Production
Website: www.syntholene.com
Coordination Contact: Dan Sutton
Public Contact: comms@syntholene.com

Relevance for Europe’s eSAF Scale-up

The scale-up of eSAF depends heavily on cost reduction, energy efficiency and the ability to integrate renewable power, hydrogen production and carbon conversion into commercially viable fuel production pathways.

Syntholene addresses this challenge through a thermally integrated production concept. By combining high-temperature electrolysis with geothermal heat integration, the company aims to reduce production costs and improve the scalability of synthetic aviation fuel production.

This approach is relevant for Europe’s emerging eSAF market because cost competitiveness will be a decisive factor for moving from regulatory mandates and pilot projects toward larger-scale deployment and long-term offtake structures.

Technology and Project Status

Syntholene initiated operations of its geothermally integrated high-temperature electrolysis demonstration facility in Húsavík, Iceland, in June 2026.

According to the company, the facility is intended to demonstrate a thermally integrated approach to clean fuel synthesis and support the commercialisation of its Thermal Hybrid Production System. The company’s stated target product is ultrapure synthetic jet fuel.

Collaboration Context

Syntholene Energy may be relevant for organisations across the eSAF and synthetic fuel value chain, including:

• eSAF and PtL project developers

• Airlines and aviation fuel offtakers

• Renewable energy and geothermal energy partners

• High-temperature electrolysis technology providers

• CO₂ supply and carbon utilisation partners

• Industrial heat and energy integration partners

• Fuel logistics and certification stakeholders

• Investors and project development partners

• Research and demonstration partners

• Public authorities and regional development agencies

Company Overview

Syntholene Energy is commercialising its Thermal Hybrid Production System for low-cost clean fuel synthesis. The company’s target output is ultrapure synthetic jet fuel, with the stated objective of producing it at significantly lower cost than competing technologies.

In June 2026, Syntholene initiated operations of what the company describes as the world’s first geothermally integrated high-temperature electrolysis demonstration facility in Húsavík, Iceland. This positions Syntholene as an early operational actor in the emerging eSAF and synthetic fuel production landscape.

Role in the eSAF Ecosystem

Syntholene is positioned as an eSAF producer within the synthetic aviation fuel ecosystem.

The company focuses on clean fuel synthesis with a strong emphasis on thermal integration and cost reduction. Its Thermal Hybrid Production System is designed to improve the economics of synthetic jet fuel production by integrating high-temperature electrolysis with available thermal energy resources.

Within the eSAF value chain, Syntholene contributes to one of the central challenges of market scale-up: producing synthetic aviation fuel at costs that can support broader commercial deployment.

Area of Expertise

• Thermal Hybrid Production System

• Low-cost clean fuel synthesis

• Synthetic jet fuel production

• High-temperature electrolysis

• Geothermal energy integration

• Thermal integration for eFuel production

• eSAF production pathways

• Demonstration-scale synthetic fuel production