Five cities in California have the nation's highest density of homes with solar panels, while Detroit has the lowest, according to new analysis that uses AI to track solar deployment via high-resolution aerial imagery.

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Reproduced from Cape Analytics; Chart: Axios Visuals

What they did: Cape Analytics analyzed visual data on tens of millions of homes in major metro areas nationwide by working with partners like the location data company Nearmap. That enabled a fine-grain analysis of residential solar power at a neighborhood level.

Why it matters: The firm intends its localized data to help policymakers better understand where solar power is being adopted and why — and help homeowners understand if they can get state-specific incentives for going solar.

  • Solar power currently provides roughly 2% of U.S. electricity, and while it's growing fast, advocates hope to see even faster deployment.
  • Cape Analytics marketing head Kayvan Farzaneh tells Axios the company is "not in the business of selling solar panels, but of course we're supporters of renewable energy."

What they found: Every "super solar" neighborhood in the U.S. — those with over 500 homes and solar systems — is in California, except for one in Saint Petersburg, Florida, which is 13.2% solar.

  • Dallas and Miami have nearly the same number of sunny days per year, but Florida has more tax credits and incentives for going solar than Texas.
  • And while California is far and away the nation's solar leader, Cape Analytics' data shows how its distribution there is uneven.

The big picture: Cape Analytics examined the entire U.S., Farzaneh tells Axios. The company has access to addresses of nearly all homes in America, Farzaneh said, and currently works with many U.S. property insurance companies.

  • "We’re the first in the insurance industry to be doing this, at this kind of scale … as far as I know," Farzaneh said. Cape Analytics supplies home insurance providers with AI-extracted data on roof conditions, overhanging trees, pools, and other factors that could affect insurance policies.
  • In creating this new report, Cape Analytics says it did not use specific home addresses. The company's aerial imagery partners gathered data from neighborhoods as groups.

Go deeper: Solar power systems spike in homes, businesses and industrial plants

Go deeper

Gulf Coast braces for Zeta after storm strengthens into hurricane

Hurricane Zeta's forecast path. Photo: National Hurricane Center

Louisiana Gov. Gov. John Bel Edwards (D) declared a state of emergency Monday as Zeta strengthened into a hurricane and threatened Mexico's Yucatan Peninsula as it moved towards the U.S. Gulf Coast.

The state of play: Zeta was expected to make landfall on the northern part of the Yucatan Peninsula Monday night, bringing with it a "dangerous storm surge" and "heavy rainfall" as it moved into the Gulf of Mexico, the National Hurricane Service said.

Updated 37 mins ago - Politics & Policy

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Illustration: Sarah Grillo/Axios

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Supreme Court rejects request to extend Wisconsin absentee ballot deadline

Photo: Saul Loeb/AFP via Getty Images

The Supreme Court in a 5-3 decision Monday rejected an effort by Wisconsin Democrats and civil rights groups to extend the state's deadline for counting absentee ballots to six days after Election Day, as long as they were postmarked by Nov. 3.

Why it matters: All ballots must now be received by 8 p.m. on Election Day in Wisconsin, a critical swing state in the presidential election.

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