Bruce Anstey won a hectic SES TT Zero for Japanese tech-specialists Mugen with a lap speed of 118mph on Wednesday afternoon.
The Flying Kiwi took the lead from team mate John McGuinness at Ballaugh as the Morecambe man suffered a temporary technical problem.
William Dunlop on the Victory Brammo Power machine pushed Bruce hard, taking a well-earned second, comfortably ahead of Daley Mathison on the University of Nottingham's entry.
John McGuinness, winner of the last two SES TT Zero races and current class lap record holder, later managed to restart his machine to finish fourth overall.