Sunnova Powers Over 54,500 Customers Through Ernesto

Sunnova SunSafe® solar + storage systems have energized more than 63,000 customers through storms in July and August

Sunnova Energy International, Inc. ("Sunnova") (NYSE: NOVA), an industry-leading adaptive energy services company, announced today that it powered more than 54,500 customers in Puerto Rico during and after Tropical Storm Ernesto from August 13 to August 19 while the local utility grids buckled and were unable to deliver power to approximately half of the residents on the Island. During these seven days, Sunnova solar + storage customers generated a tremendous 8.05 GWh of energy.

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“Keeping the lights on for over 54,500 Puerto Rican customers who lost grid power this month shows the tremendous value of our solar + storage systems,” said William J. (John) Berger, President and Chief Executive Officer at Sunnova. “Nearly half of the Island was without power after the most recent storm, and at such critical and vulnerable times like this, we had the capability to deliver when the local utilities could not. By powering all of these customers in Puerto Rico, we are demonstrating the true power of solar + storage to protect our customers and their communities, and to live life uninterrupted®. Our systems protect homeowners and provide peace of mind with clean, resilient power that comes backed by the best service in the industry.”

Approximately 98.5% of Sunnova SunSafe® systems in Puerto Rico were unscathed from Ernesto. For those systems that did see damage, Sunnova technician crews were on the ground and performing repairs just hours after the storm struck. Sunnova offers an industry-leading 25-year service guarantee to all residential solar customers through Sunnova Protect™, and the 1.5% of Puerto Rican customers who experienced interruption to their systems from Ernesto were no exception.

“Once more, the durability and dependability of Sunnova’s solar + storage systems were battle-tested by another major storm and proved to be an excellent source of reliable electricity,” said Paul Mathews, Executive Vice President and Chief Operating Officer at Sunnova. “It is unfortunate that so many of our customers have dealt with severe weather this summer, but it’s clear that going through storms with Sunnova service provides customers increased resiliency and reliable off-grid power. We are here for the long haul and as demonstrated with our rapid response, our customers can count on us when it matters most. I couldn’t be more proud of our Service teams and their response in Puerto Rico.”

In total, more than 63,000 Sunnova customers were able to maintain power after losing access to the electric grid during three recent Atlantic storms since early July. Sunnova powered more than 5,500 customers across a four-state region during and after Hurricane Debby from August 5 to August 12 while the local grids were unable to deliver power to residents. And in July, Hurricane Beryl dealt a crippling blow to the Houston metropolitan area grid, knocking out power to nearly three million customers. In the week during and after Beryl, Sunnova powered nearly 3,000 Houston-area customers and saw 96% of its systems undamaged by the hurricane.

Serving an extensive customer base of over 400,000 customers spread across 51 U.S. states and territories, Sunnova remains dedicated to advancing the energy landscape through its mission of powering energy independence™.

About Sunnova

Sunnova Energy International Inc. (NYSE: NOVA) is an industry-leading adaptive energy services company focused on making clean energy more accessible, reliable, and affordable for homeowners and businesses. Through its adaptive energy platform, Sunnova provides a better energy service at a better price to deliver its mission of powering energy independence™. For more information, visit http://www.sunnova.com.

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