Planted, an Oakland, California-based startup focused on autonomous solar construction, has raised $31.8 million in new funding.

The round was co-led by Piva Capital and RA Capital Management Planetary Health, with participation from Breakthrough Energy Ventures, Gigascale Capital, Google and Khosla Ventures.

Planted uses digital twins, software and robots to build solar farms on difficult terrain without flattening the land. Its technology allows solar panels to follow the natural shape of the ground, including slopes of up to 27%.

The company says its approach can reduce the amount of land needed for a solar project while producing the same amount of power. In one project near St. Louis, Planted redesigned a solar farm that used 40% less land than the original plan, helping the project move forward after facing zoning concerns.

Planted creates a digital twin of a site to plan the exact position of each solar panel. Its robots then precisely install the posts needed to support the panels.

The technology can also help developers build solar projects on land that traditional systems may not be able to use. In one project supporting a data center in Washington state, Planted’s redesign increased potential energy production by 2.5 times.

The company says its system can also reduce land preparation, protect existing vegetation and make solar projects easier to permit.

Planted will use the new funding to expand its robotic fleet and launch Sage, its next-generation field robot, which is expected to enter deployment in late 2026.

Led by CEO Eric Brown, Planted aims to make solar and energy infrastructure faster to build while using less land and reducing construction costs.