Every June, three races provide insight into how much electric power has become a regular part of motorsports: The Isle of Man TT Zero motorcycle race, the 24 Hours of LeMans, and the Pikes Peak International Hill Climb. This year, there were disappointments as well as triumphs, but progress nonetheless. Isle of Man TT Zero For followers of electric two-wheeling, this year’s Tourist Trophy (TT) Zero had one high moment, a record-setting run by Michael Rutter on a Team Mugen bike, which did one lap at 121.824 mph (18:34.956 for the 37.75 mile course). Admittedly, because of the relatively low energy density of batteries to petrol, the electric bikes do a single lap compared to the six laps on the more powerful and faster superbikes. He was flagged off on his run by Prince William, Duke of Cambridge, and received his trophy in similarly royal style. Rutter topped a field of “privateers” and university teams, which all did credibly. It …