The cheap natural gas freed from shale by horizontal drilling and hydraulic fracturing (or fracking) has helped kill off bleeding-edge programs like Electrofuels, a bid to use microbes to turn cheap electricity into liquid fuels, and ushered in programs like REMOTE, a bid to use microbes to turn cheap natural gas into liquid fuels. ↑ Patrascu, Daniel (2020-12-03). "Future Porsche Cars to Run on eFuels, Motorsport Machines Included". autoevolution. Retrieved 2021-03-30. ↑ "Audi advances e-fuels technology: new "e-benzin" fuel being tested".