Vivent Solar is teaming up with Google on “Project Sunroof,” a new online tool created by Google that provides homeowners with custom solar information for their home. It works through high-resolution aerial mapping (Google Earth technology) to help calculate a roof’s solar energy potential.

Project Sunroof computes how much sunlight hits your roof in a year in part using Google Map technology.

“Vivint Solar teaming up with Google is giving homeowners across the country immediate insight, information and access to rooftop solar power—that’s good for everyone,” said Greg Butterfield, CEO of Vivint Solar.

The new online tool is being tested in the San Francisco Bay Area as well as Fresno, both in California, and greater Boston. The program will tell the homeowner how much sunlight hits their rooftop throughout the year while factoring in roof orientation, shade from trees and nearby buildings, and local weather patterns. A homeowner can also enter their typical electric bill cost for more customized results. The tool will combine the information to estimate the amount a homeowner could potentially save with solar panels, and it can help connect them with local solar providers, like Vivint Solar.

“Vivint Solar has created an incredible product that’s revolutionizing the energy market,” said Dwain Kinghorn, chief strategy and innovations officer at Vivint Solar. “It’s simple. It’s affordable. And together with Google, we’re able to let customers all over the country know that solar power is a lot simpler and more affordable than they might have thought.”