Google-parent Alphabet is shutting down its power-generating kites company Makani, the first closure of a so-called moonshot project since founders Larry Page and Sergey Brin stepped back from management in December.

Sundar Pichai, who took over as Alphabet chief executive, is under pressure to stem losses from the company’s “Other Bets” segment, which includes endeavors such as self-driving cars and Internet-providing balloons. Other Bets lost $4.8 billion last year—widening from a $3.4 billion loss in 2018.

Makani was acquired in 2013 and taken into the experimental “X” lab. It was developing airborne wind turbines that could be tethered to floating buoys, removing the need for the expensive ocean bed structures needed to support permanent turbines.