McGuinness will once again be partnered with Bruce Anstey, and the 21-time race winner expects the Japanese firm to have an all-new bike for their efforts next year.
With rival team MotoCzysz not on the grid last year, Mugen was able to take their first electric class win at the Isle of Man TT, setting a record pace of 117.366 mph in the process.
McGuinness and Mugen will have their eyes set on the 120 mph barrier for next year, which would put them squarely in the supersport-speed territory at the Isle of Man, albeit over only a single-lap distance.
What other teams and racers have signed onto the 2015 SES TT Zero race remains to be seen, which will be important as the Isle of Man TT is currently the last high-profile venue for electric motorcycle racing.
There is legitimate concern that Mugen will be the only serious entry for 2015, but we still have many months yet to go. Fingers crossed.