Planted raises $31.8 million for robot-built solar deployment

A solar startup called Planted has raised $31.8 million to expand its use of robots that build large solar farms. The company, based in Oakland, California, uses software and automated machinery to install solar panels on land that would normally be too costly or difficult to prepare, including slopes up to 27%. Instead of grading the land flat, its mounting systems follow the natural shape of the ground.

Planted's design packs panels close together rather than spacing them out in the wide rows typical of standard solar farms. This lets it fit about twice as much solar power onto the same amount of land as conventional systems, while using far less steel for the mounting structures. The company says this approach also speeds up installation, and it plans to roll out a new robot called Sage in late 2026 to further cut the time it takes to build a solar array.

This is large-scale, utility and community solar development, not something that applies to home rooftop panels. But it points to where big solar projects may increasingly be built: on land that developers previously skipped because it was hilly or expensive to prepare. Planted has already completed an 11 megawatt community solar project near Chicago and expects to reach 100 megawatts of installations in 2026, with plans to eventually offer sites that also include battery storage for large energy users. For homeowners, the practical effect could be more nearby community solar options in areas with uneven or marginal land, though nothing in this funding announcement changes what is available to sign up for today.