In November 2013, Sato became a test and development driver for the FIA Formula E Championship. In September 2014, Sato joined his former Formula One team Amlin Aguri to race in the first-ever Formula E race, the 2014 Beijing ePrix, replacing the team's regular driver Antonio Félix da Costa as he could not participate due to other commitments. Sato scored two points after he set the fastest lap of the race with a time of 1:45.101, but had to retire from the race with mechanical issues. As it was Sato's only Formula E race, he became the only driver in the series' history with a 100% fastest lap record.