British mag Auto Express has caught the 7-series test cars while testing in Germany, which were easily spotted because of the massive hydrogen tank in the boot. It’s expected the first batches will be leased out to small fleets that will give BMW feedback on the ownership experience. Mazda has begun a similar campaign with modified RX-8 hydrogen cars in Japan. It's possible an official announcement about this will be made at the LA Motor Show towards the end of the year.
Click ahead to see a video of a BMW official explaining CleanEnergy.