Home solar provider Sunrun now sells batteries to 3 in 4 new customers
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Sunrun attached a battery to 75% of the home energy systems it sold in the third quarter of 2026, the highest storage attachment rate in its history. The US residential solar and storage provider reported its Q3 results on Nov. 4, with total revenue of $1.1 billion, up 52% year over year.
The same release carried a less comfortable number. Sunrun now expects full-year Cash Generation of approximately $200 million, excluding equipment safe harbor investments. That sits at the bottom of its previous guidance range of $200 million to $375 million.
Read together, the figures describe a company selling more storage per customer while signing up fewer new ones. Subscriber additions fell 24% to 22,957 in the quarter. Total subscribers still grew 9% year over year, reaching 1,057,695 as of Sept. 30.
The revenue figure also needs context. Energy systems and product sales revenue rose 134% to $546 million, which Sunrun attributes mainly to an arrangement agreed in the third quarter of 2025 under which certain storage and energy systems tied to new customer agreements are sold to a third party. Sunrun keeps the customer and servicing relationships. Revenue from customer agreements and incentives, the recurring subscription side of the business, rose a more modest 13% to $553.5 million.
Residential solar is turning into a battery business
Storage is now the default for Sunrun customers. The attachment rate has risen every quarter since Q3 2025, when it stood at 70%.
As of Sept. 30, Sunrun had installed more than 284,000 storage and solar systems, giving it approximately 5.0 gigawatt hours of networked storage capacity. A year earlier, that figure stood at about 3.7 gigawatt hours.
Chief Executive Mary Powell described Sunrun in the release as “the nation’s largest Residential Independent Power Producer.”
That label reflects a change in what the company sells. Rooftop panels produce energy when the sun shines. A networked fleet of home batteries can store that energy and release it when the grid needs it most, giving Sunrun a second role as a source of dispatchable capacity.
Installed volumes were softer. Storage capacity installed fell 9% year over year to 374 megawatt hours, and solar capacity installed fell 15% to 204 megawatts. Powell said Sunrun’s direct business had returned to growth, with installations up 9%, which suggests the decline sits in other parts of its sales mix. The release does not give a full channel breakdown.
Home batteries are starting to work like power plants
The clearest evidence of that second role came from grid dispatch events. In September, Sunrun contributed more than 320 megawatts to a 580 megawatt event, 56% of the total, which the company describes as the largest such residential event on record. On Oct. 5, it supplied more than 400 megawatts of a 669 megawatt event. A day later, it supplied more than 430 megawatts of a 745 megawatt event.
For grid operators, residential batteries offer capacity that already sits behind customers’ meters and needs no new transmission lines or generation sites. For Sunrun, the question is how to get paid for it. The company says it aims to earn new streams of cash from distributed power plant programs and from emerging data center and grid edge applications. The release attaches no revenue figures to those plans.
Falling value per customer is squeezing cash
The narrower cash outlook reflects weaker per-customer economics. Net Subscriber Value fell 28% year over year to $9,462, and Aggregate Subscriber Value dropped 20% to $1.3 billion for the quarter. Sunrun now expects full-year Aggregate Subscriber Value of approximately $4.6 billion, the bottom of its earlier range of $4.6 billion to $4.9 billion.
Financing costs play a part. Sunrun calculated Subscriber Value using an 8.4% discount rate, based on observed project-level capital costs, up from 7.3% a year earlier. For a business that funds long customer contracts with capital raised upfront, a higher cost of capital reduces what each new customer is worth today.
Third-quarter Cash Generation was $6 million, or $56 million excluding $50 million of equipment safe harbor investments. Chief Financial Officer Danny Abajian said Sunrun expects higher Cash Generation in the fourth quarter.
The release also lists a tax risk among its forward-looking statements. If the IRS determines that the creditable basis of Sunrun’s energy systems is materially lower than the company has claimed, Sunrun may have to pay significant amounts to its fund investors. The release presents this as a risk, not as an IRS finding.
Sunrun says it is America’s largest provider of home battery storage, and its fleet has shown it can deliver hundreds of megawatts to the grid on demand. What it has not yet shown is how much that capacity will earn, and whether grid revenue can grow fast enough to offset slower customer additions and costlier capital.
Source:
Sunrun press release
