There’s a new No. 1 solar-powered city in the U.S., with San Diego replacing Los Angeles as the top city for installed solar PV capacity by the end of 2016, according to a new report from Environment America and the Frontier Group.

U.S. solar power grew at a record-breaking pace last year, and the report says the country’s major cities have played a key role in the clean energy revolution and stand to reap tremendous benefits from solar energy. As population centers, the cities are big sources of electricity demand, and with millions of rooftops suitable for solar panels, they have the potential to be key sources of clean energy as well.

The report, titled “Shining Cities: How Smart Local Policies Are Expanding Solar Power in America,” says San Diego overtook Los Angeles, which had been the national leader for the previous three years. Notably, Honolulu rose from sixth place at the end of 2015 to third place at the end of 2016. San Jose and Phoenix rounded out the top five spots for installed PV.

As of the end of 2016, the top 20 cities – representing just 0.1% of U.S. land area – accounted for 5% of U.S. solar PV capacity. The report says these 20 cities have nearly 2 GW of solar PV capacity – almost as much solar power as the entire country had installed at the end of 2010.

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The quest to make solar energy a major source of the world’s electricity will not succeed if national policies and industries compete as though it is a zero-sum game.

That is just one of many findings of The New Solar System, a sprawling report released earlier this week by Stanford University’s Steyer-Taylor Center for Energy Policy and Finance, a joint research center that includes the university’s business and law schools. The result of two years of work — including interviews with dozens of government officials and industry executives in China and the U.S. — the report sketches out a future where the scale of solar depends on self-interested cooperation.

“The New Solar System does not seek to enable any country to beat another in the global solar industry. It seeks instead to help all countries find their most effective places,” wrote the report’s authors, Jeffrey Ball, Dan Reicher, Xiaojing Sun and Caitlin Pollock.

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When Google first launched a website two years ago that collects data on solar rooftops, called Project Sunroof, it only covered a few cities. But this week, the search engine giant announced the solar site is now crunching data for every single U.S. state, including 60 million rooftops across the country.

The expansion means that Google’s Project Sunroof is starting to get a much clearer picture of how much rooftop solar capacity there actually is in the U.S. Project Sunroof uses data from Google Maps and Google Earth, combined with 3-D modeling and machine learning to determine the solar electricity potential of individual roofs.

Potential solar customers — or just the solar-curious — can enter their addresses into the site and get information about how much a solar system on their roof might cost and how much money they might save over time by going solar.

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The U.S. solar market had its biggest year ever in 2016, nearly doubling its previous record and adding more electric generating capacity than any other source of energy for the first time ever.

Over the next five years, the cumulative U.S. solar market is expected to nearly triple in size, despite a slight dip expected in 2017. GTM Research and the Solar Energy Industries Association (SEIA) announced these historic figures today with the publication of the U.S. Solar Market Insight 2016 Year in Review report.

On average, U.S. solar photovoltaic (PV) system pricing fell by nearly 20 percent in 2016. This is the largest average year-over-year price decline since GTM Research began modeling pricing in this report series.

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While the U.S. solar market continues to grow rapidly, solar generation still represented a tiny share of overall U.S. electricity, according to the latest figures from the U.S. Department of Energy’s Energy Information Administration (EIA).

The latest edition of EIA’s Electric Power Monthly shows that the portion of electricity that the nation gets from solar grew nearly 40% in 2016, from around 1% of total generation to 1.4%. Wind is likewise growing, with the share of electricity from wind rising from 4.7% in 2015 to 5.5% of all generation last year.

And while these are relatively low shares, solar and wind made up more than 60% of new generation put online last year by capacity.

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