Yamamoto was called in to replace António Félix da Costa for the 2015 London ePrix. He raced for Amlin Aguri, partnering Salvador Duran. Round 10 saw Yamamoto qualify his car in 18th position but he retired from the race after a problem with the battery coming out of the pits. The next race saw him suffer a similar fate. He failed to set a time in qualifying after the tricky rain conditions caused him to hit the wall and then also retired from the race after running into the back of Jarno Trulli. He finished the season with no points and 35th and last in the standings.