Excerpt:

Makani Power, a wind energy company owned by Google, expanded its space from 17,000 square feet to 127,000 square feet in a former naval airplane hangar in Alameda Point.

The company makes a wind power generating device that flies at high altitudes and is tethered to the ground. The idea is that the devices can capture wind energy at a more consistent level in the atmosphere than wind turbines on the ground.

Google bought Makani in May of 2013 for an undisclosed amount when it was in the testing phase and needed to capital to grow. As part of the lease agreement, Google has an option to take another 367,000 square feet in adjacent hangars and buildings in Alameda Point.