Two emerging European energy companies, Spark e-Fuels and Norsk e-Fuel, are making strides in producing synthetic aviation fuel (e-SAF) through innovative methods. E-fuels are created by combining green hydrogen with captured CO2 to produce low-carbon fuel. Despite the high cost of renewable energy, these companies are leveraging new technologies to optimize production based on the availability of cheap renewable power. Spark e-Fuels in Germany has secured a €2.3 million pre-seed funding round to advance a pilot e-SAF production plant. Their patented demand-responsive technology allows for flexible and simplified production of sustainable aviation fuel, attracting investments from climate-focused investors like Nucleus Capital. On the other hand, Norsk e-Fuel, based in Norway, is collaborating with strategic German investor Prime Capital and renewable energy company RES to progress Project Alby, a new e-SAF plant in Sweden, aiming to produce 80,000 tonnes of synthetic fuel annually. This project signifies a key step towards reducing aviation emissions and transitioning to sustainable aviation practices. Both companies are aligned with the European Union's ReFuelEU initiative, which mandates increasing e-fuels' share in airport supplies. With partnerships with Boeing and notable investors, the focus is not only on sustainable aviation but also on driving the green transition forward in the energy and chemical industries.