SRAM appears to be getting closer, as Shimano did back in 2016, with its own electric motor. According to rumors, SRAM also has a patent for what appears to be an electronic transmission powered by a central battery, similar to what you'd find on an e-bike.
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SRAM engine prototype sighted at EWS-E
A Nukeproof Megawatt eMTB with a SRAM engine prototype was spotted in the race.