According to Jin10, SpaceX announced that it will work with Tesla and make an initial investment of $16.8 billion to build a Terafab chip facility in Texas. A blogger said Musk appears to be pursuing a free electron laser (FEL) technology path to challenge ASML's LPP EUV light source, and Musk later responded with the words "FEL FTW". The report also said FEL has advantages including high power, high coherence, tunable wavelength, and greater energy efficiency, and could theoretically push lithography light sources from 13.5 nm to 6 nm or shorter, although the large accelerator system, cost, and mass-production stability remain the biggest industrialization challenges.